Radiographic Assessment of Digital Tray Technique versus Conventional Technique on the Accuracy of Mandibular Screw Retained Implant Overdentures
Aya
Fawzy
Department of Removable Prosthodontics, Faculty of Oral and Dental Medicine, Future University in Egypt, Egypt
author
Shady
El Naggar
Department of Removable Prosthodontics, Faculty of Oral and Dental Medicine, Badr University in Cairo, Egypt.
author
text
article
2021
eng
Abstract Purpose: This study purposed to be introduced to evaluate the effect of the digital tray technique used on the accuracy of mandibular screw-retained implant overdentures compared with complete denture incorporated with barium sulfate as a radiographic stent. Materials and Methods: Forty-eight patients were examined for implant placement. Each implant site was planned virtually using two different techniques: denture duplication technique with barium sulfate incorporation and digital tray technique. Implantation placement had been performed in both groups using the same three-dimensional manufactured radiographic stent. Post insertion CBCT was introduced with simulated scheduling images. Angular deviation, global deviation, lateral deviation, and depth of implant placement were collected for planned and placed implants of both groups. Results: Using an independent t-test for significance assessment of global, lateral, and angular deviation between both groups, it was revealed that there was a significant difference between both groups and an insignificant difference for implant depth. Conclusion: Within limitations regarding radiographic accuracy depending on the radiographic technique; it showed less deviation of digital tray group than conventional denture duplication technique with barium sulfate incorporation.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3291
3304
https://edj.journals.ekb.eg/article_201457_66eb9b55533a092d92657b4fb15b72b2.pdf
dx.doi.org/10.21608/edj.2021.76565.1638
Effect of Aging on Translucency and Flexural Strength of Different Zirconia Materials (An In-Vitro Study)
Amr
Alzebdah
B.D.S (2015), Faculty of Dentistry, October University for Modern Sciences and Arts.
author
Ahmed
hamdy
Professor of Fixed Prosthodontics Faculty of Dentistry October University for Modern Sciences and Arts
author
Alaa
Naguib
Lecturer of Fixed Prosthodontics Faculty of Dentistry October University for Modern Sciences and Arts
author
text
article
2021
eng
Statement of Problem: Since ultra high translucent cubic zirconia was evolved in the market, comparison were made with high translucent tetragonal zirconia regarding translucency and flexural strength after thermal aging. Aim of This Study The aim of study is to detect translucency and flexural strength changes of two different zirconia materials before and after aging. Material and Methods: Forty Zirconia samples (n=20) from each type (Cubic and Tetragonal Zirconia) were prepared then autoclaved. The aging parameter was set to a temperature of 134 C° and a pressure of 2 bar for 10 hours of aging. A spectrophotometer device was used for measurement of translucency and contrast ratio of each group. Piston and three supporting balls test were used for flexural strength test. Results: The results showed that Zirconia type (regardless of aging) had a statistically significant effect on mean translucent parameter and flexural strength. Aging had a statistically significant effect on mean translucent parameter and flexural strength except for the cubic zirconia which showed non-significant lower flexural strength after aging. Conclusion: Aging (regardless of Zirconia type) had a statistically significant effect on mean translucent parameter and flexural strength. Flexural strength of cubic zirconia was not significantly affected by aging.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3305
3311
https://edj.journals.ekb.eg/article_201458_09d40c68abda89382b34168cdb6eb7b1.pdf
dx.doi.org/10.21608/edj.2021.76742.1641
Comparing two different angulated abutment designs on marginal bone loss around divergent two implants retaining mandibular overdentures: A radiographic prospective study.
Marwa
Mohamed
Lecturer of Prosthodontics, Faculty of Dentistry, Mansoura University, Egypt.
author
text
article
2021
eng
Objectives: the aim of this study was to radiographically compare the influence of two different angulated abutment designs on marginal bone loss around 30-degree divergent two implants retaining mandibular overdentures. Materials and Methods: Thirty six patients were selected. For each patient, two distally inclined dental implants (3.5 mm × 13 mm) were bilaterally inserted in the canine regions by using stereolithography stent. Patients were divided into two groups as follows: Group AB (n=18) : Patients received two ball attachments which were screwed to the angulated overdenture abutments. Group AL (n = 18): Patients received two locator attachments which were screwed to the angled overdenture abutments. Marginal bone loss was assessed at the time of implant insertion (baseline), and after every 12 months up to 36 months by using digital periapical radiographs. Results: Both groups showed insignificant difference at the mesial aspect in peri- implant bone loss at 12 months. But, ball group recorded a significant increase in peri-implant bone loss (0.26)) in comparison to locator group (0.23). But, at the distal aspect there was a statistically insignificant difference between both groups at 12, 24 and 36 months Conclusion: The locator attachment can be considered more favorable than the ball attachments regarding the peri-implant bone loss around 15 distally inclined implants used for assisting mandibular complete over denture. Key Words: Mandibular implant overdenture, Angled abutment and peri‑implant bone loss.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3312
3322
https://edj.journals.ekb.eg/article_201459_624eeaa370a8681eeac7dff3f57fbbfb.pdf
dx.doi.org/10.21608/edj.2021.77600.1647
Biting Force and chewing efficiency of Conventional and CAD/CAM complete dentures. A Cross-over Study
nourhan
ragheb
Lecturer, Prosthodontist, Department of Prosthodontics, Faculty of Oral and Dental Medicine, Kafr El-Sheikh University, Kafr El-Sheikh, Egypt.
author
Wafaa
Ibrahim
Lecturer, Prosthodontist, Department of Prosthodontics, Faculty of Oral and Dental Medicine, Delta University for Science & Technology, Mansoura, Egypt.
author
text
article
2021
eng
Background: Many studies reported using CAD/CAM technology in implant-supported prostheses. However, few studies reported its use in complete dentures. The aim of this study is to compare the Maximum Biting Force (MBF) and chewing efficiency of complete dentures fabricated by conventional, rapid prototyping and milling techniques. Materials and Methods: This is a clinical study with a cross-over design where 27 completely edentulous participants were divided in a random order into 3 equal groups as 1. received conventional complete denture 2. received 3D printed complete dentures 3. received milled complete dentures. Assessment of MBF was performed after denture insertion at 1 week, 1 month and 3 months, using Flexiforce A 301® force sensor. Mixing ability test was used to assess chewing efficiency 3 months after denture insertion. Repeated measure ANOVA test and Paired sample t-test were used with P ≤ 0.05 level of significance. Results: Regarding the MBF, there was a statistically significant increase (p < 0.001) in the MBF at 1w, 1m and 3m follow-up periods in all three groups. There was a statistically significant difference in chewing efficiency between 5, 10, 20, 30 and 50 strokes and between the three groups (p < 0.001). MBF and chewing efficiency increased significantly (p < 0.001) in Printed CAD/CAM and Milled CAD/CAM groups when compared to conventional complete dentures. Milled group showed a statistically significant improvement (p < 0.001) in MBF and chewing efficiency when compared to Printed group. Conclusion: The CAD/CAM fabricated dentures showed better results in terms of MBF and chewing efficiency compared to conventional complete denture.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3323
3335
https://edj.journals.ekb.eg/article_201460_ee4c24b6453ba4db630f11b684de9f2b.pdf
dx.doi.org/10.21608/edj.2021.77671.1648
Correlation between the water sorption and the flexural strength in heat-cured acrylic resin with different fillers
Ahmad
Shoeib
Lecturer, Department of Removable Prosthodontics, Faculty of Dentistry, Al-Azhar University
author
Ahmed
Shoun
Assistant Professorm Department of Removable Prosthodontics, Faculty of Dentistry, Al-Azhar University.
author
text
article
2021
eng
Purpose: The purpose of this study was to correlate the water sorption and flexural strength of acrylic resin reinforced with three different fillers. Materials and Methods: A Flexural strength test using a universal testing machine was done for 132 heat-cured acrylic resin specimens reinforced with titanium oxide nanoparticle, aluminum oxide nanoparticle, silanated, and non silanated glass fibers (n=12). Another 132 discs with the same fillers were evaluated for water sorption at 37°C ± 1°C using a four-digit electric balance. Specimens were stored in distilled water for 120 days. Statistical analysis was done using Pearson correlation (p < 0.05) to correlate the water sorption and the flexural strength at each nanoparticle concentration. Results: The correlation between the water sorption and the flexural strength was positive for the titanium oxide and aluminum oxide nanoparticles, and negative for the glass fibers specimens. However, these correlations were non-significant. Conclusion: Water sorption of heat-cured acrylic resin has no correlation with the flexural strength with the addition of titanium oxide nanoparticle, aluminum oxide nanoparticle, silanated and non silanated glass fibers
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3337
3344
https://edj.journals.ekb.eg/article_201461_c428d37724d716a2dc3d2b2c0d6890f4.pdf
dx.doi.org/10.21608/edj.2021.78144.1653
Bonding of zirconia superstructure to one-piece titanium and zirconia implants with different luting agents.
Mahy
Hassouna
Assistant Professor, Fixed Prosthodontics Dept., Faculty of Dentistry, Mansoura University, and Delta University
for Science and Technology, Egypt.
author
Lamia
Dawood
Associate Professor, Fixed Prosthodontics Dept., Faculty of Dentistry, Mansoura University, and Delta University
for Science and Technology, Egypt.
author
text
article
2021
eng
Purpose: This in-Vitro research was performed to determine how zirconia and titanium one-piece implants are bonded to zirconia superstructure crown using different luting cements. Materials and methods: sixty-four zirconia ceramic superstructure (ceramill zolid) were bonded to thirty-two one-piece titanium implants and thirty-two one-piece zirconia implants, using four different luting agents: group GI: glass-ionomer cement, group RG: resin-modified G.I, group SA: self-adhesive resin cement and group CR: conventional resin cement. Subsequently to thermocycling (5°C to 55°C water over a 15,000-cycle span, with a dwell time of 15 seconds), the crowns were detached vertically (pull-out test) with a Universal Testing Machine. Post-Hoc Tukey test was used to detect pairs of comparisons. One-way ANOVA test was used for statistical analysis. Results: The titanium and zirconia groups differed significantly (P <.001). With titanium specimens, the average bond strength values were higher than in the zirconia specimens. The highest reported value was for the conventional resin cement group (CR) of titanium implants (630.38±83.0 N) while the lowest one was reported for glass ionomer cement (GI) of zirconia implants (129.64±15.94 N). Conclusions: The proper selection of a luting agent when bonding zirconia ceramic superstructure onto one-piece zirconia implants is important. Conventional resin cements and self-adhesive cements could be used for bonding of zirconia superstructure for both titanium and zirconia implants.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3345
3354
https://edj.journals.ekb.eg/article_201462_904b922d5600ca92ceb847fca7c47e07.pdf
dx.doi.org/10.21608/edj.2021.73643.1604
Influence of dental bonding surface and bonding methods on marginal adaptation of occlusal veneer after thermal aging
Lamia
Dawood
Associate Professor, Fixed Prosthodontics Dept., Faculty of Dentistry, Mansoura University, and Delta University
for Science and Technology, Egypt
author
Walid
Al-Zordk
Associate Professor, Fixed Prosthodontics Dept., Faculty of Dentistry, Mansoura University, Egypt
author
text
article
2021
eng
Objectives: The aim of this study was to evaluate the influence of different dental bonding substrates and bonding methods on the marginal quality in mandibular molars restored using monolithic zirconia occlusal veneer after thermal aging. Materials and Methods: Eighty extracted mandibular molars were collected and divided, based on type of dental bonding surface and bonding method, into eight groups. A non-retentive occlusal veneer preparation was performed to be either within enamel, dentin, dentin with intra-coronal cavity, or dentin with composite filling. 1-mm zirconia occlusal veneers were fabricated. For each specimen, the marginal gap was measured (x40) using a stereoscope. Each occlusal veneer was bonded to its corresponding tooth using either etch-and-rinse or self-etch system. All specimens were thermal aged (5̸55 °C) for 7500 cycles. The post-cementation marginal gap was measured. Two-way ANOVA test and post-hoc test were applied to test for significance in marginal gap values in relation to bonding substrates and bonding method. Results: No statistically significant difference in pre-cementation marginal gap values was detected between different bonding surfaces. For post-cementation, two-way ANOVA test indicated significant differences in marginal gap values in relation to bonding substrates and bonding method. Conclusions: The type of dental bonding surface (either enamel, dentin, dentin with composite filling, or dentin with intra-coronal cavity) can influence the marginal quality of zirconia occlusal veneers after thermal aging. Compared with self-etch, etch-and-rinse bonding method demonstrated superior marginal quality of zirconia occlusal veneer restoration after thermal aging.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3355
3363
https://edj.journals.ekb.eg/article_201463_82099ff7abc3cc5e75854bd692964657.pdf
dx.doi.org/10.21608/edj.2021.74210.1608
A NEW METHOD FOR ASSESSMENT OF MENTAL FORAMEN RELATED LANDMARKS USING COMPUTED TOMOGRAPHY SCAN
Mona
Elramady
Department of Prosthodontics, Pharos University, Alexandria City, Alex., Egypt
author
text
article
2021
eng
Background: Mental foramen is the opening of mandibular canal in the mandibular body, and its place shows contra-versus. As mental foramen is an essential anatomical landmark required for implant surgery, the determination of the exact place for the mental foramen to detect exact amount of local anesthesia solution and to decrease dismissed injuries during the prosthetic surgical treatments. The determination of the situation of mental foramen according to its site in horizontal and vertical direction of mental foramen according to the adjacent premolars and molars on the skull, diagnostic radiographs, and CBCT. Objectives: Assessment of MF related landmarks using computed tomography scan by a new computerized method. Materials and Methods: Twelve patients ranging from 45-60 years old came to the department of prosthodontics, Alexandria University, Alexandria, Egypt. The anatomical structural landmarks such as mandibular canal, mental foramen according to its site relative to the lower border of the mandible of the mandible were evaluated by radiographic CT and scores were assessed. All the measurements done by Image J computed program which was not used in the previous studies. Results: Anatomical landmark structures in the mandible (mandibular canal, mandibular foramen, mental foramen, and incisive canal) were detected and measurements in millimeter were recorded by using CT images. Conclusion: An essential anatomical landmark for the dentist is the place of mental foramen so, the dentists must have attention about this anatomical landmark before any surgical procedure including mental foramen region. Computed tomography (CT) is highly essential measure to avoid any expected complication.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3365
3372
https://edj.journals.ekb.eg/article_201464_a4ce2a5e2586fda36943ad34ef213186.pdf
dx.doi.org/10.21608/edj.2021.74887.1616
The Effect of different Surface Treatments on Shear Bond Strength of Cubic Zirconia
Engy
Hemdan
Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University
author
Tarek
Morsy
Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University
author
Fatma
Mohamed
Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University
author
text
article
2021
eng
Statement of the problem: The conventional methods of adhesive bonding used in silica containing ceramics cannot be used for bonding of zirconia due to absence of silica. Objective: The study was designed to evaluate the effect of different surface treatments on the shear bond strength of cubic zirconia before and after aging. Materials and Methods: A total of 56 cubic zirconia plates with dimensions (10mm length and 10mm width and 2mm thickness) were divided into four groups according to surface treatment (Group 1;No treatment n=14, Group 2; Air abrasion 50µm AL2O3 particles for 15 seconds n=14, Group 3; CO2 laser at 10W for 10 seconds n=14, Group 4; CO2 laser at 20W for 10 seconds n=14), then each group was subdivided into 2 subgroups which are(Group a: before aging) and (Group b: after aging) n=7. All specimens were cemented with MDP resin cement (Panavia SA cement plus) and stored in a distilled water for 24 hours. Then shear bond strength test (SBS) was assessed in MPa with a universal testing machine before and after thermocycling. Results: The results of this study clearly showed that the samples treated with CO2 laser groups at 20 W have the highest shear bond strength of resin cement to zirconia ceramic followed by CO2 at 10 W followed by sandblasting group and the control group showed the least shear bond strength. Conclusion: The application of CO2 laser surface treatment enhanced the shear bond strength of ultra-translucent zirconia to MDP containing resin cement.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3373
3379
https://edj.journals.ekb.eg/article_201465_c7cd8e0a3f42057abfc3f8450e271e7e.pdf
dx.doi.org/10.21608/edj.2021.88260.1725
Biomechanical behavior of different implant abutment materials
Mohamed
Elkholy
Fixed Prosthodontics, faculty of dentistry at tanta university
author
mohamed
sedeek
Associate Professor, Fixed prosthodontics Depart. Faculty of Dentistry. Tanta Universty (Main Supervisor)
author
waleed
elshahawy
Assistant Professor, Fixed Prosthodontics Department Faculty of Dentistry Tanta University
author
elrefaiy
qenawy
Professor, Department of Chemistry, Faculty of Science. Tanta University
author
text
article
2021
eng
Purpose: to study the mechanical properties and Finite Element Stress Analysis of three implant abutment materials. Materials and Methods : Fifteen bars (25mm length, 4mm. thick and 5mm.width)of three abutment materials ;High Performance Polymer Hybrid abutments , Nano-Fiber Reinforced Composite and Fiber Reinforced Composite divided into three groups were exposed to Flexure Strength and Deflection tests. Fifteen implant abutments (two parts abutment) covered by all ceramic crowns divided into three groups were exposed to Static Fracture Resistance test and Finite Element Stress Analysis .Results: Flexure Strength tests mean and standard deviation of bar specimens showed significant difference, where Gp I, II, III were 519.29±0.46), 200.74±0.33and 315.43±0.59) .Also, Deflection test mean and standard deviation were 3.052±0.040, 0.984±0.106, 2.028±0.027 receptively revealed significant difference. The comparison between fracture resistance mean and standard deviation of the tested abutment three groupswere 642.00±.5.637,306.00±30.496 and 514.40±12.915 respectivelyand revealed significant difference. Finite Element Stress Analysis of applied vertical load on the three abutment materials did not have clear difference but the least stresses created on bone with Nano-FRC abutment(16.2) followed with FRC (17.32) then BioHPP abutment (18.55).Conclusion: Fracture strength of BioHPP abutments with ceramic crowns had the potential to withstand maximum occlusal forces, also showed better fracture patterns than the FRC and NFRC abutments. and showed a better stress distribution on the set, suggesting a good mechanical behavior.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3381
3391
https://edj.journals.ekb.eg/article_201466_8d710053663578dcbff1a4d733f1718f.pdf
dx.doi.org/10.21608/edj.2021.80631.1676
Effect of Different Techniques of CAD/CAM Designed BioHpp Frameworks on The Supporting Structures of Kennedy Class I Telescopic Partial Denture Cases
HEBA
ELSARRIF
Assistant Lecturer in Prosthodontics Department, 6th of October University
author
Shaimaa
Mohamed
Assistant Professor of Prosthodontics, Ain Shams University.
author
Marwa
Sabet
Professor of Prosthodontics, Ain Shams University.
author
text
article
2021
eng
Objective: This study was carried out to radiographically evaluate the effect of the two different CAM techniques of BioHpp frameworks fabrication (milled and pressed) on the supporting structures of Kennedy Class I telescopic partial dentures using the digital parallel radiographic technique ( Digora software system). Materials and Methods: Fourteen patients with mandibular Kennedy class I and opposing short maxillary Kennedy class I were selected. The last standing abutments for all patients were the premolars. After receiving zirconia primary crowns, patients were divided into two groups, group I received milled BioHpp telescopic RPDs, and group II received pressed BioHpp telescopic RPDs. Patients of both groups were evaluated at the time of denture insertion, at six months, and at 12 months. The evaluation included measurements of bone height changes mesial of the first abutment and distal of the second abutment and at the crest of the residual ridge. Results: There was a statistically significant difference in the marginal bone height changes between the two groups. Group I (milled BioHpp) showed more bone resorption around the abutments than group II, while group II (pressed BioHpp) showed more resorption at the residual ridge crest than group I. Conclusion: Milled and pressed BioHpp telescopic partial denture produced acceptable treatment options regarding bone loss. Milled BioHpp frameworks (group I) had a greater effect on bone resorption around the abutments than pressed BioHpp (group II). Pressed BioHpp showed more bone height changes at the residual ridge area than the residual ridge milled one.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3393
3402
https://edj.journals.ekb.eg/article_201467_087080067aa0de61bfe47a16fcd6a45c.pdf
dx.doi.org/10.21608/edj.2021.76015.1677
EVALUATION OF BALL TYPE PRECISION ATTACHMENT FOR LOWER CLASS I KENNEDY CLASSIFICATION USING NEW COMPUTERIZED METHOD
Mona
Elramady
Lecturer at Prosthodontics Department of Prosthodontics, Pharos University, Alexandria City, Alex., Egypt
author
text
article
2021
eng
Introduction: Several types of attachments are accessible and they have been broadly used with removable partial/complete denture prosthesis, segmented fixed prosthesis. Yet, no single attachment is ideal for every case, so that the appropriate attachment should be selected for each individual situation. Objectives: To evaluate clinically the effect of using evaluation of ball type precision attachment for lower class I Kennedy classification using new computerized method (Image J program) by using panoramic x-ray and its effect on the bone height and changes at different sites. Material and Methods: Twelve patients ranged from 45-60 year old. Patients complaining from pain in some teeth, inability to masticate, chewing food and unsatisfactory esthetic. There are multiple missing teeth, the lower arch of the mandibular jaw is class I Kennedy classification without modification, fabrication of upper metallic casted partial denture and lower ball type precision attachment for lower bilateral distal extension Kennedy class I classification. Possessing of the upper and lower prosthesis, finishing, polishing and instruction for the patient. Results: By comparing between gender grouping by using ball type attachment, showed that the vertical height in the edentulous women were lower than that of the men. The statistical difference was evaluated with a P < 0.05 through t-test which detected between different groups. Conclusions: The use of ball type attachment for removable partial denture provide good retention support and stability of the partial denture improving function ability of mastication, showing and good esthetic acceptance for both gender groups.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3403
3412
https://edj.journals.ekb.eg/article_201468_9df79386ec730048264c4cb4ab516d9f.pdf
dx.doi.org/10.21608/edj.2021.81424.1680
Comparison Of Chair Side Time And Treatment Outcomes Of Stabilization Splints Obtained From Digital Versus Conventional Workflow
Amr
Elkhadem
Associate Professor, Prosthodontics, Faculty of Dentistry, Cairo University
author
Reem
Hossameldin
Associate Professor, Oral and Maxillofacial Surgery, Faculty of Dentistry, Cairo University
author
text
article
2021
eng
The use of stabilization repositioning splints (SRS) to treat muscular TMDs is a growing practice owing to its’ effectiveness and simplicity. The conventional construction procedure requires meticulous occlusal adjustments which consumes considerable chairside time. Changing the procedure to a full digital approach might decrease the chair side time. Aim: To evaluate the chairside time required to construct SRS with conventional impression procedure compared to intra oral scanning and printing. Materials and methods: 30 patients suffering from muscular TMDs were allocated into 2 groups. Group 1 received SRS made out of a vacuum sheet formed over a dental model and modified with cold cured resin. Group 2 received SRS made from intra oral scans and digitally constructed and 3D printed. The time needed in the impression appointment and SRS fitting appointment was calculated. Patients were followed for 8 weeks to evaluate improvement of pain scores and range of mandibular opening. Results: regarding the treatment time the impression appointment time was statistically insignificant for both groups (13.15±1.77) and (12.47±1.96) minutes for groups 1 and 2 respectively. For the fitting appointment the duration showed statistical significant decrease when comparing group 2 (4.49±1.42 min) to group 1 (36.51±6.21min). For both group there was a statistical improvement in pain score and maximum incisal opening, yet there was no statistical significant difference between group 1 and 2. Conclusion: construction SRS with intra oral scans yielded the same patient improvement when compared to conventional construction technique but with significant decrease in the required chairside time
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3413
3420
https://edj.journals.ekb.eg/article_201469_e79f3bbe7bfb5526b983d09086f7d804.pdf
dx.doi.org/10.21608/edj.2021.82336.1687
All on four fixed prostheses versus implant overdentures for management of edentulous maxilla opposing mandibular 2- implant assisted overdentures
Hesham
Alam
Associate Professor, Prosthonontic Department , Faculty of Oral and Dental Medicine at Future University
author
Mona
Aboelnagga
Associate Professor, Prosthodontic Department, Faculty of Oral and Dental Medicine, and Shams University
author
text
article
2021
eng
Purpose: This study aimed to compare two treatment modalities; All on four fixed prostheses and locator retained overdentures; to rehabilitate patients having problems associated with edentulous maxilla opposing mandibular implant assisted overdentures. Materials and methods: Ten patients complaining from looseness and instability of their maxillary dentures that oppose mandibular 2-implant-retained overdentures were randomly divided into 2 groups: Group I included 5 patients who received four implants according to the All-on- four Concept (2 parallel middle implants and 2 posterior implants with distal inclination). Implants were immediately loaded with fixed acrylic prosthesis, then after 6 months the prosthesis was replaced with fixed ceramometal restoration, Group II, included 5 patients who received four implants that were immediately loaded with Locator retained maxillary overdentures using new maxillary dentures. Clinical (plaque index (PI), gingival index (GI), probing depth (PD) and implant stability (IS)) and radiographic (marginal bone loss (MBL) outcomes were recorded at baseline (T0), 6 (T6) and 12 (T12) month after prosthesis insertion.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3421
3434
https://edj.journals.ekb.eg/article_201470_98de111b7c4c77e1fb92a1d914f12183.pdf
dx.doi.org/10.21608/edj.2021.82412.1689
Three-Dimensional evaluation of marginal bone resorption associated with flap and flapless placement of immediately loaded implants retaining mandibular overdentures with resilient stud attachments. One year randomized controlled clinical trial
Samer
Ali
Associate Professor, Removable Prosthodontics Department Faculty of Dentistry, October University For Modern
Science and Arts. Giza, Egypt.
author
text
article
2021
eng
Purpose: This study was carried out to evaluate Three-Dimensional marginal bone resorption with flap and flapless placement of immediately loaded implants retaining mandibular overdentures with locator attachments. Materials and methods: Ten edentulous patients (6 males and four females, with an average age of 59 years) complaining of lack of retention of mandibular dentures received two implants in the canine positions of the mandible using either flap (group 1) or flapless (group 2) surgical approach. All implants were immediately loaded with locator retained mandibular overdentures. Cone beam CT was used to measure Three-Dimensional bone loss at mesial, distal, buccal and lingual surface of each implant. Measurements were made at baseline, six and 12 months later after delivery. Results: The survival rate was 90% and 100% for flap and flapless groups respectively. For all implant surfaces, flap group showed significant higher bone resorption than flapless group. After 12 months, the highest bone loss occurred at the mesial surface and the lowest bone loss occurred at the buccal surface in the flap group. For flapless group, the highest bone loss occurred at buccal surface and the lowest bone loss located at lingual surface. For all implant surfaces in both groups, marginal bone loss after 12 months was significantly higher than the values after six months. Conclusion: Within the limitations of this study, the flapless surgical approach is recommended for locator retained mandibular overdentures than the flap approach as it was associated with reduced marginal bone loss after 12 months.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3435
3446
https://edj.journals.ekb.eg/article_201471_62868b97a500d3425e6838248cc4c41c.pdf
dx.doi.org/10.21608/edj.2021.73360.1600
Probing depth and patient satisfaction with mandibular overdentures retained by four versus two mini-implants: randomized controlled clinical study
May
Hassan
Lecturer, Removable Prosthodontic Department College of Oral and Dental Surgery, Misr University for Science
and Technology, Giza Egypt.
author
Ayman
Gouda
Lecturer, Oral and Maxillofacial Surgery Department, Faculty of Dentistry, Cairo University, Cairo, Egypt
author
Eman
Helal
Researcher, Fixed& Removable Prosthodontics Dep., National Research Centre (NRC), Cairo, Egypt
author
text
article
2021
eng
Background Nowadays mandibular overdentures retained by mini-implants are used on a wide scale as a substitute for the conventional dental implant supported overdenture thus further studies are required to verify this replacement. Methodology Fourteen patients were randomly categorized into two equal groups. In the first group (Group I) patients received mandibular overdentures retained by four mini dental implants, while in the second group (Group II) patients received mandibular overdentures retained by two mini dental implants. All patients were scheduled for recall visits and probing depth was recorded at time of loading, six months and twelve months. Patient satisfaction was evaluated after six months of complete prostheses installation. For parametric data, Independent sample t-test was used to compare between two groups in non-related samples. Paired sample t-test was used to compare between two groups in related samples. For non-parametric data, Mann Whitney test was used to compare between two groups in non-related samples. Wilcoxon test was used to compare between two groups in related samples. Results Regarding probing depth: (Group I) was significantly lower than (Group II) after 6 and 12 months, while in patient satisfaction there was non-significant difference between the two groups in the first group of questions related to ( general satisfaction, phonetics and aesthetics while there was significant difference in the second group of questions related to (prosthesis stability and comfort)between the two groups.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3447
3456
https://edj.journals.ekb.eg/article_201878_bbe4223d84129c2d8c2d3f0bac57255d.pdf
dx.doi.org/10.21608/edj.2021.84126.1702
Evaluation of Patient Satisfaction with Mandibular Screw Retained Hybrid Prosthesis Versus Mandibular Implant Over-Dentures Retained by Telescopic Attachments
Khaled
Abdelwahab
Ass. Prof, Prosthodontic Department New Giza University
author
MOHAMED
ABDALLA
Ass. Prof, Prosthodontic Department Cairo University
author
text
article
2021
eng
A comparative study was done regarding patient satisfaction between telescopic retained implant supported and retained over-denture prosthesis on four implants and a screw retained hybrid prosthesis rehabilitation also retained by four implants in patients with a completely edentulous mandible. Twenty patients were evaluated in this study, split into two groups. Regarding the evaluation of the patient satisfaction it was tested using a quantitative method, by asking the twenty patients different questions in a questionnaire. After an appropriate follow –up period from 2 weeks, to 12 months in both groups (telescopic retained overdenture and screw retained hybrid restoration), the results revealed the following; there was no statistically significant difference after 3 months as well as from 3 to 6 months and also from 6 to 9 months. Also there was a none statistically significant difference from 9 to 12 months, regarding patient satisfaction. In conclusion patients were equally satisfied with both prosthetic options.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3457
3463
https://edj.journals.ekb.eg/article_201879_78a341971965a16daa5d8691cacbae53.pdf
dx.doi.org/10.21608/edj.2021.81904.1703
Impact of Two Different Designs and Materials on Fracture Resistance of Occlusal Veneers (In Vitro Study)
Yasmin
Elgendy
Fixed Prosthodontics Dept., Faculty of Dentistry, Mansoura University, Mansoura, Egypt
author
Manal
Abo Madina
Professor, Fixed Prosthodontics Dept., Faculty of Dentistry, Mansoura University, Mansoura, Egypt
author
Nesma
Elgohary
Instructor, Fixed Prosthodontics Dept., Faculty of Dentistry, Mansoura University, Mansoura, Egypt
author
text
article
2021
eng
Abstract Statement of the problem: Occlusal veneer restorations represent a minimal invasive alternative to traditional crowns in treatment of severely worn dentition. However, the data regarding the mechanical performance of occlusal veneers designs and materials are still controversial. Aim of study: Evaluation of the effect of using two different designs and materials on fracture resistance of occlusal veneer restorations. Materials and Methods: Thirty-two freshly extracted premolars were randomly divided into two main groups (n=16) according to preparation design: Group B: butt joint preparation design and Group M: Modified occlusal veneer design. Each main group was further subdivided into two subgroups (n=8) according to type of restorative material used for occlusal veneer fabrication: Lithium disilicate and polymer-infiltrated ceramic network. Occlusal veneer restorations were fabricated by CAD/CAM technology and then cemented to their corresponding teeth using dual cured adhesive resin cement. Fracture resistance test was done using universal testing machine. The load needed for fracture of each specimen was registered automatically in Newtons (N) by a special software. Data were collected, tabulated and statistically analyzed. Results: Student's t-test results revealed that there was no statistically significant difference regarding the two variables (preparation design and material type). Also, Two-way ANOVA test results showed that there was no statistically significant difference regarding the interaction between the two variables in this study (P=0.309). Conclusion: There was no effect of preparation designs and material types on fracture resistance of occlusal veneers. The fracture resistance for all study groups exceeded the reported range of human masticatory forces.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3465
3473
https://edj.journals.ekb.eg/article_201880_f864fc0c55a9e381f9121a43b99941a1.pdf
dx.doi.org/10.21608/edj.2021.84679.1706
Evaluation of Cervical Margin Relocation for CAD/CAM Zirconia Crowns Using Different Composite Resin Materials and Cavity Designs: Marginal Gap and Microleakage
Khaled
Elbanna
Assistant Professor, Fixed Prosthodontics Division, Oral and Maxillofacial Department, Umm Al-Qura University,
Saudi Arabia.
author
Ahmed
Zidan
Assistant Professor, Biomaterials Department, Faculty of Dentistry, October University for Modern Sciences and
Arts (MSA).
Assistant Professor, Conservative and Restorative Dentistry Department, Faculty of Dentistry, Umm Al-Qura
University, Saudi Arabia.
author
Nada
Abd Al-aleem
Assistant Professor, Conservative and Restorative Dentistry Department, Faculty of Dentistry, Umm Al-Qura
University, Saudi Arabia.
author
text
article
2021
eng
This study evaluated the effect of the material and the extension of the relocated margin on the marginal adaptation of the extra coronal restoration and microleakage at the tooth/resin interface after thermo-mechanical cyclic loading. Materials and methods: 196 teeth were divided into six groups according to type of cavity design and build-up restoration. All the groups received a standardized MO cavity preparation. The gingival seat was located 2 mm above the CEJ. Group I was without any modification and restored with direct composite. For Group II, III and IV the gingival seat extended 2mm below the CEJ and restored with direct, flowable, indirect composite respectively. Group V had MOD cavity where the proximal boxes had the same criteria of the mesial preparation of Groups II-IV. Samples of Group VI received the same preparation as Groups II, III and IV but was extended another 4mm in the buccal direction. Groups V and VI were restored with direct composite. Margin gap and microleakage scores were evaluated after cyclic loading Results: Group VI and IV showed the highest mean margin value compared to different cavity designs and materials used for CMR respectively, however within clinically acceptable range. Group III showed the highest microleakage scores. Conclusions: The use of CMR with single or multiple narrow cavities is more favorable than with wide cavities. CMR is a logical option in teeth with deep proximal cavities that needs to be crowned.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3475
3790
https://edj.journals.ekb.eg/article_201881_6f6e456aa8980778e3622ee2085d1e9c.pdf
dx.doi.org/10.21608/edj.2021.84814.1708
Influence of Different Marginal Preparation Designs and Materials on the Marginal Integrity and Internal Adaptation of Endocrown Restorations
Samra
AL-Zomur
Master’s Degree Student, Department of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University.
author
Manal
Abo-Madina
Professor, Department of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University.
author
Mahy
Hassouna
Lecture, Department of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University
author
text
article
2021
eng
ABSTRACT Objective: This in vitro study was performed to assess the marginal accuracy and internal adaptation of CAD/CAM fabricated endocrowns restoring endodontically treated molars with two different designs and materials. Materials and methods: Forty extracted maxillary first molar teeth were divided into two main groups (n=20) according to the preparation designs: group B: (Butt joint) & group S (Shoulder finish line): and each group was subdivided into two subgroups (n=10) according to materials: group E: lithium disilicate glass-ceramic (IPS e.max CAD; Ivoclar Vivadent AG) & group C: hybrid nanoceramic (Cerasmart; GC Corp). A digital scan was made with a digital scanner (Identica Hybrid Scanner; Germany) and virtual endocrowns were milled with a 5-axis milling machine ((Imes-Icore; CORiTEC250i; Germany). The silicone replica technique and a stereomicroscope (25X) were used to measure the marginal and internal gaps of endocrowns at different points. All data were statistically analyzed using three-way ANOVA test with Post Hoc Tukey test to detect pair-wise comparison. Student's t-test also was used. Results: There was a statistically significant difference between the preparation designs on the marginal integrity and internal adaptation (p < 0.05), but restorative materials significantly affected on the internal adaptation (p < 0.05) and showed no significant effect on the marginal integrity (p>0.05). Conclusions: All tested groups showed acceptable marginal and internal gaps mean values. Butt joint design showed a better effect than shoulder finish line design on the marginal integrity and internal adaptation. Cerasmart showed a better effect than IPS e.max CAD on the internal adaptation.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3491
3500
https://edj.journals.ekb.eg/article_201882_d914641dfd6f2dafbc779c43140ade4d.pdf
dx.doi.org/10.21608/edj.2021.85048.1710
Evaluation of peri-implant and posterior bone loss in rigid versus non-rigid telescopic attachments in two-implant supported mandibular overdenture
Diana
Khalil
Assistant Lecturer of Prosthodontics, Faculty of Dentistry, Fayoum University.
author
Emad
Agamy
Professor of Prosthodontics and Vice Dean for Education and Student Affairs, Faculty of Dentistry, Minia University
author
Gihan
Mohammed
Professor of Prosthodontics and Vice President, Kantara University
author
text
article
2021
eng
Aim: The purpose of the study was to evaluate peri-implant and posterior bone loss in rigid and non- rigid telescopic two-implant supported mandibular overdenture. Materials and Methods: 12 completely edentulous patients received two mandibular interforaminal implants to retain telescopic overdenture with metal band inserted beneath the first molar tooth bilaterally, opposed by maxillary complete denture. Group I (6 patients) had rigid telescopic connection and group II (6 patients) received non-rigid telescopic attachments. Radiographic evaluation was made after one year of using the overdenture to assess peri-implant and posterior bone loss using standardized periapical long cone parallel technique. Results: there was no statistical significant difference regarding peri-implant bone loss between the two groups. On the other hand, there was statistical significant difference in posterior bone loss being higher in the non-rigid group. Conclusion: telescopic two-implant mandibular overdenture showed great success and acceptance among patients, no implant failure or screw loosening occurred during one year using the overdenture, bone loss was in the accepted values. Within the limitations of this study, rigid telescopes can be used on two implants to retain mandibular overdenture opposed by maxillary complete denture.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3501
3508
https://edj.journals.ekb.eg/article_201883_101f68414802c7af202e027095497000.pdf
dx.doi.org/10.21608/edj.2021.86606.1715
RADIOGRAPHIC EVALUATION OF THE EFFECT OF IMPLANT SUPPORTED AND IMPLANT RETAINED DISTAL EXTENSION REMOVABLE PARTIAL DENTURES ON THE SUPPORTING STRUCTURES
Ragia
Kotb
Clinical instructor at Removable Prosthodontics department Faculty of Dentistry Alexandria University.
author
Ahmed
Ahmed Hassan
Associate Professor of Prosthodontics, Faculty of Dentistry, Minia University, Egypt.
author
Emad
Agamy
Professor of Prosthodontics, and Vice Dean for Education and Student Affairs, Faculty of Dentistry, Minia University, Egypt
author
Gihan
Mohammed
Professor of Prosthodontics and vice President, Kantara University; Egypt
author
text
article
2021
eng
Objective: To evaluate and compare the effect of implant supported versus implant retained removable partial denture restoring Kennedy's class I cases on the supporting structures by measuring marginal bone loss and bone density around implant. Subjects and Methods: Twelve patients were selected from the outpatient clinic, Prosthodontics Department, Faculty of Dentistry, Minia University. Both groups were classified into two equal groups; according to the implant superstructures either dome shaped abutment -and-ball and socket attachment. Each Patient of both groups had two implants in second molar position and received removable partial denture of the same design. Patients were followed up for one year radiographicaly regarding marginal bone loss and bone density around each implant. Group I: Six patients received RPD supported by dome shaped short abutments. Group II six patients received RPD retained by ball and socket attachments. Results: Results revealed that there was Significant increase in marginal bone loss in group II implant retained with ball abutment than group I implant supported with dome shaped abutment and Significant increase in bone density in group I (implant supported) than group II (implant retained) Conclusion: The use of dome shaped abutment produce less marginal bone loss and increase of bone density than the use of ball abutment.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3509
3517
https://edj.journals.ekb.eg/article_201884_504265c62e0494ad72550940573ab7d6.pdf
dx.doi.org/10.21608/edj.2021.86774.1717
Effect of different mechanical surface treatments on bond strength of acrylic teeth to polyamide denture base
Alaa
Soliman
Demonstrator, Department of Prosthetic Dentistry, Faculty of Dentistry, University of Tanta, Egypt
author
Mohamed
Elgendy
Lecturer, Department of Prosthetic Dentistry, Faculty of Dentistry, University of Tanta, Egypt
author
Mohamed
El-Sheikh
Professor, Department of Prosthetic Dentistry, Faculty of Dentistry, University of Tanta, Egypt.
author
text
article
2021
eng
ABSTRACT Purpose: To compare the effects of three surface treatments on bond strength between acrylic teeth and polyamide denture base. Material and Methods: 60 specimens, each composed of maxillary central acrylic cross-linked incisor tooth processed onto thermoplastic polyamide denture base according to the Japanese Standards Association 6506. Test specimens were divided according to the experimental design: Surface treatments (sandblasting, T-shape diatoric holes, or both). The specimens were then subjected to shear load with the Universal Testing Machine. Load was applied till denture teeth separated from the base resin. The resulting debonding forces were recorded and statistically analyzed by using T student-test and ANOVA test followed by Tukey HSD test. The interface where failure occurred was inspected to determine the type of failure whether adhesive or cohesive. Results: Statistical significant differences were found in bond strength among the different surface treatment groups (P<0.05). Conclusion: Within the limitations of this in-vitro study, under normal storage condition, it can be concluded that sandblasting of the diatoric holed teeth give the highest bond strength.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3519
3523
https://edj.journals.ekb.eg/article_201885_712d836619065a712b2dec35a258f420.pdf
dx.doi.org/10.21608/edj.2021.86999.1720
Retention and Wear Characteristic Assessment of OT Equator with Smart Box Attachment Versus Ball Attachment for Mandibular Two Implant Assisted Over Denture. In-vitro Study
Doaa
Rostom
lecturer in prosthodontics dep ,faculty of dentistry,Cairo Univ,Egypt
author
Nourhan
Ragheb
Lecturer in prosthodontics department, Faculty of oral and dental medicine, Kafrelshiekh Univ
author
text
article
2021
eng
Introduction: Excessive implant angulation, leads to increased maintenance of the prosthesis .This research aimed to evaluate the retentive power and wear of the equator with smart box attachment use with 10 degree tilted two implant assisted mandibular overdenture .Material and methods:: this in-vitro was carried on six mandibular completely edentulous casts which received two mandibular implant in the cuspid region bilaterally .the cast divided into 2 equal group. (Groups I) OT equator with smartbox attachment and (Groups II) ball attachment .The overdenture were subjected to 1440 cyclic loads. The retention values and wear of the attachments were recorded baseline and after 0, 720, and 1440 cycles .Result: Comparison between both groups was performed using Independent t-test which revealed significant difference after 1400 cycle P
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3525
3532
https://edj.journals.ekb.eg/article_201887_78187035318d58dbb3f9330946fa53ef.pdf
dx.doi.org/10.21608/edj.2021.64765.1524
Biologic and prosthetic complications with two versus four mini-implants supporting mandibular overdentures in patients with knife edge ridges. One-year results of randomized controlled clinical trial
Ramy
Moustafa Ali
Assistant Professor, Removable Prosthodontic Depatment Faculty of Dentistry Fayoum University Removable
Prosthodontic Depatment Faculty of Dentistry King of Faisal University
author
Mohamad
Helmy
Lecturer, Removable Prosthodontic Department, Faculty of Dentistry, Assiut University
author
text
article
2021
eng
the aim of clinical trial was to evaluate biologic and prosthetic complications with two versus four mini-implants supporting mandibular overdentures in patients with knife edge ridges. Twelve edentulous participants (6 men and 6 women, mean age =58.47 years) were randomly assigned into 2 groups; Group 1(control); included six participants who received four mini dental implants equally distributed in the interforaminal area of the mandible. Group 2 (study); included six participants who received two mini dental implants the canine area of the mandible. For both groups mandibular dentures were connected to the implants by O-ring attachments. The incidence biologic and prosthetic complications (related to the implants/attachments and to the overdentures) were measured from base line 12 months after overdenture insertion and compared between groups. Results: The implant survival rate, peri-implantitis, pocket depth >3mm, bone loss >1mm, separation of the metal housing from the denture base, teeth fracture, overdenture fracture, and denture relinings did not significantly differ between groups. The 4-implant group showed significant higher pain, edema, peri-implant mucositis, teeth wear, and denture border adjustments than the two implant group. The 2-implant group showed significant higher abutment bending /fracture, O/ring wear/ distortion, and O/ring damage/replacement than the 4-implant group 2 mini-implants may be a suitable alternative to 4-mini-implants when used to retain mandibular overdentures as it was associated with reduced pain, edema, peri-implant mucositis, teeth wear, and denture border adjustments. However, 2-mini-implants are associated with increased prosthetic complications related to attachments as abutment bending /fracture, O/ring wear/ distortion, and O/ring damage/replacement.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3533
3545
https://edj.journals.ekb.eg/article_201888_e88ee076af22bd7a353fde72d54e44d3.pdf
dx.doi.org/10.21608/edj.2021.89407.1733
MARGINAL ADAPTATION AND FRACTURE RESISTANCE OF ENDOCROWN RESTORATIONS CONSTRUCTED FROM TWO CAD/CAM BLOCKS.
Amira
Elsharkawy
Associate Professor, Fixed Prosthodontics, Faculty of Dentistry, 6th of October University, Giza, Egypt
author
text
article
2021
eng
Objective: The aim of this study was to evaluate the marginal adaptation and fracture resistance of endocrowns made from Lithium disilicate (Emax CAD) and CAD/CAM composite blocks (Brillient Crios) restoring mandibular premolars. Materials and Methods: Fourteen extracted human single rooted mandibular premolars were endodontically prepared in a standardized way to receive CAD/CAM fabricated endocrowns, the samples were divided into two groups (n=7); E. max CAD (EM) group and Brillient Crios (BC) group. Marginal gaps (µm) evaluated under stereomicroscope after cementation and repeated after thermocycling. Fracture load was recorded and Failure modes were determined by digital microscope and scanning electron microscope SEM. Results: EM group verified higher vertical marginal gap mean value than BC either before or after thermocycling, the difference was statistically significant as indicated by two-way ANOVA (p>0.05). EM group recorded significantly higher fracture resistance mean values (737.55±223.3N) than BC (434.33±100.8 N) group, (p < 0.05) as verified by unpaired t-test. The failure mode presented that (71.44%) of BC specimens exhibited favorable type and (28.57%) catastrophic failure. Whereas, EM group revealed (71.43%) catastrophic failure and (28.57%) favorable type. Chi square test (P < 0.05) displayed statistically significant difference between both groups. Conclusions: Brilliant Crios endocrowns showed better marginal adaptation and more favorable failure mode than those fabricated from E max CAD. E max endocrowns revealed higher fracture resistance than Brillient Crios.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3547
3560
https://edj.journals.ekb.eg/article_201889_9fc02573948e121a19fd72a997a9096f.pdf
dx.doi.org/10.21608/edj.2021.89595.1735
Effect of Diode Laser irradiation on the Bond Strength of Fiber Posts after Endodontic Retreatment Using Different Sealers.
Amira
Elsharkawy
Associate Professor, Fixed Prosthodontics, Faculty of Dentistry, 6th of October University, Giza, Egypt
author
text
article
2021
eng
Purpose: To investigate the effect of diode laser activated irrigation on bond strength between fiber post and radicular dentin after endodontic retreatment using two different sealers. Materials and Methods: Seventy-two extracted human maxillary central incisors were collected, decoronated, endodontically prepared then divided to three groups (n=24) according to sealer type: GP group: gutta-percha without sealer (control group); AD group: AD sealer; and BC group: Bioceramic sealer. Specimens were endodontically retreated after 30 days using the same sealers. 10 mm deep post spaces were prepared in each specimen. Each group was further sub-divided into three subgroups (n=8) according to post space treatment: irrigated with saline (Control), (EDTA) and (laser and EDTA). One tooth from each group was selected for SEM analysis. Posts were cemented, push out tests were performed. Failure modes were analyzed using a digital microscope. Results: With all dentin pretreatment protocols, AD group recorded the highest bond strength mean value followed by GP and BC group respectively, with significant difference (P<0.05) as demonstrated by two-way ANOVA. However, (Laser+EDTA) recorded the highest bond strength followed by (EDTA) and (saline) respectively, with significant difference as demonstrated by three-way ANOVA (P<0.05). There was no-significant difference among root regions (P>0.05). Predominant failure mode was the mixed type as detected by Chi square test. SEM revealed absence of smear layer and opened dentinal tubules after (laser and EDTA) treatment. Conclusions: laser activated irrigation of root dentin significantly improved the bond strength of fiber post after endodontic retreatment with both sealers.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3561
3578
https://edj.journals.ekb.eg/article_201890_aaa34737d0a41d35b3af6b9f6a426478.pdf
dx.doi.org/10.21608/edj.2021.89597.1736
The Accuracy Of Digital Versus Conventional Open Tray Implant Impression Technique, In Partially Edentulous Patients.
MOHAMED
ABDALLA
Associate Professor, Prosthodontics Department, Faculty of Dentistry, Cairo University, Cairo Egypt
author
Mohamed
Dohiem
Prosthodontic Department, Faculty of Oral and Dental Medicine, El Zagagig University, Sharqia.
author
text
article
2021
eng
Abstract: Impression techniques using digital technology seemed to be studied with the accuracy planning to initiate acceptable prosthetic results in implant dentistry. In order to overcome these misfit, digital impression by means of an intra-oral scanner may assist. The purpose of this study was conducted to assess the efficacy of using digital impression technique compared to conventional technique Material and Methods: 8 patients were examined with a total of 22 implants placed, each patient had undergone two impression techniques: a digital impression: intraoral scan body, and a conventional impression: open tray impression, the total deviation between the two impression techniques was measured. This was done by scanning the scan body in patient mouth in group I and digitalizing the conventional open tray impression by scanning the scan body on the cast produced by the open tray in group 2. The scan body was replaced on the software (Exocad software) with custom made abutment and the deviation between the two groups was measured using (Geomagic Control X; 3D systems) GOM inspection software Results: Total deviation between groups, the open tray conventional impression was compared to hypothesized reference digital impression and were calculated using GOM inspect software. The total deviation was statistically significantly different among the studied groups. Conclusions: In partially edentulous patients, intraoral oral scanning using intra oral scan bodies improves over all accuracy, than conventional open tray impression technique.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3579
3585
https://edj.journals.ekb.eg/article_201891_c11468df0cd7e54e63937e55a31df1db.pdf
dx.doi.org/10.21608/edj.2021.89603.1737
Accuracy of digital impression technique versus conventional technique for completely edentulous patient: a controlled clinical trial.
Mohamed
dohiem
Lecturer of Prosthodontics, Faculty of Oral and Dental Medicine, Prosthodontics Department, El-Zagazig
University, Sharqia, Egypt
author
text
article
2021
eng
Objectives: now a days recent intraoral scanners (IOS) are ready for digital scans of long-span edentulous patients and completely edentulous patients ; however, there is lacking of evidence. In recent years there is vigorously promoted of digitization in the dental field .there is a significant transformation in the future of dentistry by using the intra oral scanner to have digital impression. The aim of this article to evaluated the deviation between of intraoral scanning (IOS) impression and conventional impression in completely edentulous patient and to analyze the accuracy of IOS in completely edentulous maxillary arch. MATERIALS AND METHODS: Two types of impression technique were made for eight completely edentulous patients. Intra oral scanning and conventional impression technique of the maxilla was done for each patient, the two-impression techniques were compared for accuracy using GOM inspect software. Result: Total deviation between two groups were compared to hypothesized zero representing conventional impression I group and then calculated using special inspection software. The total deviation was statistically significantly different among the studied groups. Conclusion: The accuracy of IOS not reliable for completely edentulous arches
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3587
3594
https://edj.journals.ekb.eg/article_201892_eaa7ce50b6fcd232ba0c30901d4709a7.pdf
dx.doi.org/10.21608/edj.2021.89892.1743
Effect of Locator Attachments with Different Retentive Insert Materials on Peri-implant Tissue Health in Mandibular Implant Overdenture
Alaa
Elazaly
Postgraduate Student, Department of Prosthodontic, Mansoura University, Egypt
author
Salah
Hegazy
Professor, Department of Prosthodontic, Mansoura University, Egypt
author
Ahmed
Salem
Associate Professor, Department of Oral and Maxillofacial Surgery, Mansoura University, Egypt
author
Mohamed
Said
Lecturer, Department of Prosthodontic, Mansoura University, Egypt
author
text
article
2021
eng
Aim: To compare between nylon and PEEK retentive insert of locator attachments on peri-implant tissue health in mandibular implant overdenture. Materials and methods: Twelve completely edentulous healthy patients were selected for this study. Every patient received two implants at the canine region bilaterally. According to the type of attachment received, patients were divided into two groups: Group I: overdenture was retained by locator attachment with nylon retentive insert (n=6); Group II: overdenture was retained by locator attachment with PEEK retentive insert (n=6). Evaluation of peri-implant tissue health was done for two implant-retained mandibular overdenture with locator attachment at overdenture insertion, after two weeks, three months and six months using plastic periodontal probe. The categories of peri-implant tissue health evaluation in this study included plaque index, bleeding on probing, and probing depth. The data was analyzed using SPSS and p-value less than 0.05 was considered significant. Results: At base line and 2 weeks, no significant difference in plaque scores was observed between groups. At 3 months and 6 months, PEEK inserts recorded significant higher plaque scores than nylon inserts. At all observation times, no significant difference in bleeding on probing scores was observed between two groups. Nylon inserts recorded significant higher probing depth than PEEK inserts at all observational times. Conclusion: PEEK insert could provide a successful alternative to nylon insert for locator attachment in implant-retained overdenture. However, long term follow-up is needed due to the significant increase in plaque accumulation for PEEK inserts.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3595
3601
https://edj.journals.ekb.eg/article_201894_1faefd2fdbb824dfa95855d0b25822e2.pdf
dx.doi.org/10.21608/edj.2021.90582.1749
Two canine tooth supported overdenture with ready-made attachments (3 year prospective study)
Ehab
Elsaih
Associate Professor of Removable Prosthodontics, Department of Removable Prosthodontics, Faculty of Dentistry,
Mansoura University, Egypt.
author
Bassant
Mowafey
Lecturer of Diagnosis and Oral Radiology, Oral Medicine, Periodontology, Diagnosis and Oral Radiology
Department, Faculty of Dentistry, Mansoura University, Egypt.
author
text
article
2021
eng
Purpose: To study the effect of two ready-made intra-radicular cemented attachments on abutment teeth periodontium of two canine tooth supported mandibular overdenture (OD) in 3 years study period. Materials and Methods: Ten patients with edentulous maxilla & a mandibular arch with only two canines remaining were selected based on certain criteria. All patients received maxillary complete dentures and an attachment-retained mandibular OD ; 1) Group [A] received magnetic attachment-retained OD, and 2) Group [B] received O-ring attachment-retained OD. Modified Gingival index (MGI), clinical attachment loss (CAL) and marginal bone changes (MBC) were investigated along a 3 years follow up period. Results: MGI results showed no statistically significant difference both in inter- & intra-group results. CAL results showed significant differences between successive periods of the same group with no difference between the two groups in comparable periods. Comparison of ∆ CAL values between groups in comparable periods also showed no statistical difference, but the sum of ∆ CAL in all 3 years showed statistical difference. Comparison of ∆ MBC values between groups in comparable periods showed statistical difference in the 2nd & 3rd follow-ups as well as in all 3 years combined. ∆ MBC & ∆ CAL, showed a weak positive correlation coefficient 0.368 in group 1, and a strong positive correlation 0.942 in group 2. Conclusion: It can be concluded that the two canine-supported mandibular overdenture, retained either by ball and socket or magnetic attachments, is an acceptable treatment modality with predictable clinical results from a periodontal point of view.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3603
3616
https://edj.journals.ekb.eg/article_201895_3b83a0b1aea87197b149431ff91f1472.pdf
dx.doi.org/10.21608/edj.2021.90251.1746
Effect Of Repeated Heat Pressing And Thermocycling On Micro Shear Bond Strength Of Polyetheretherketone (PEEK) To Resin Cement
Ahmed
Arafa
Lecturer, Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
author
Marwa
Emam
Lecturer, Department of Fixed Prosthodontics, Faculty of Dentistry, Beni-Suef University, Beni-Suef, Egypt
author
text
article
2021
eng
Abstract: Purpose: to evaluate the effect of repeated heat pressing and thermocycling on micro-shear bond strength of PEEK to resin cement. Methods: A total of 30 PEEK specimens 10 mm x 10 mm x 2 mm were prepared and divided to three groups (n=10). Group I was pressed using new PEEK, Group II ; 50% new PEEK and 50% reprocessed PEEK, and Group III ; 100% reprocessed PEEK. Bonding surfaces were sandblasted and thin layer of bonding agent was applied and polymerized. Plastic tygon tubes with an inner diameter of 1 mm and a height of 1.5 mm were fixed on the sample and filled with dual polymerized self etch self adhesive resin cement and cured. Half the specimens in each group (n=5) underwent 5000 thermocycles (5‐55°C) before shear bond strength (µSBS) test. Two-way Analysis of Variance (ANOVA) studied the effect of PEEK condition, thermocycling and their interaction on mean micro-shear bond strength µSBS. Bonferroni’s post-hoc test was used for pair-wise comparisons when ANOVA test is significant. Results: The PEEK condition (regardless of thermocycling) had a statistically significant effect on mean µSBS (P-value = 0.001, Effect size = 0.455). Thermocycling (regardless of PEEK condition) also had a statistically significant effect on mean µSBS (P-value = 0.002, Effect size = 0.331). The interaction between two variables had no statistically significant effect on mean µSBS (P-value = 0.442, Effect size = 0.066). Conclusion: Both repeated heat pressing and thermocycling had a negative effect on micro-shear bond strength of resin cement to PEEK
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3617
3627
https://edj.journals.ekb.eg/article_201897_bd2e3b9af83d613e6971847a0a7bb490.pdf
dx.doi.org/10.21608/edj.2021.90733.1752
A randomized controlled trial of ball and socket vs O-ring attachments for single implant-retained mandibular overdentures. A study of crestal bone loss and patient satisfaction
Dina
El talawy
Associate Professor, Removable Prosthodontic Department College of Oral and Dental Surgery, Misr University
For Science and Technology, Giza Egypt.
author
text
article
2021
eng
Purpose: This short term randomized controlled trial aimed to evaluate crestal bone loss and patient satisfaction of ball and socket and O-ring attachments used to retain single implant-retained mandibular overdenture after one year. Materials and methods: Twelve completely edentulous patients received single implant in the midline of the mandible. Three months later, the patients were randomly assigned into two groups; Group 1 (control group); six patients their mandibular dentures were connected to the implant using ball and socket attachment. Group 2 (test group); included six patients their mandibular dentures were connected to the implant using O/ring attachment. The peri-implant crestal bone loss was evaluated at mesial, distal, buccal and lingual aspects of each implant using cone beam computerized tomography made at baseline, 6 and 12 months later. Patient satisfaction was evaluated using questionnaire of visual Analogue Scales (VAS) six months after loading. Results: The implant survival rate was 100% in both groups. Ball and socket attachment recorded significant higher crestal bone loss than O-ring attachment after 6 months (p=.031) and 12 months (p=.021). Ball and socket attachment recorded significant higher patient satisfaction than O/ring attachment. Conclusion: O/ring attachment is recommended than ball and socket attachment for single implant mandibular overdentures in term of peri-implant bone preservation. However, ball and socket attachment was associated with significant higher patient satisfaction than O/ring attachment.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3629
3641
https://edj.journals.ekb.eg/article_201898_d15be042ae0aae2e1897a670b8c71297.pdf
dx.doi.org/10.21608/edj.2021.91202.1758
Antifungal Action of Thyme and Basil Extracts on Different Denture Base Materials
kowkb
eltamimi
Lecturer, Removable Prosthodontics Department, Faculty of Dentistry , Suez Canal University
author
Sara
mohamed
Lecturer, Removable Prosthodontics Department, Faculty of Dentistry , Suez Canal University
author
text
article
2021
eng
Statement of problem: The use of medical plants has expanded as a result of increased resistance of microbes to chemical medications, as well as their negative effects and excessive costs. Ocimum basilicum (basil) and Origanum Syriacum (Thyme), were studied for their antifungal activities against Candida albicans (C. albicans) species. Purpose: The goal of this study is to see if two plant extracts, Ocimum basilicum (basil) and Origanum Syriacum (Thyme), have antifungal effects on different denture base materials (long cycle heat-polymerized methyl methacrylate PMMA, short cycle heat-polymerized PMMA, and thermoplastic monomer free microcrystalline polymer karadent). Material and methods: Plant extracts (basil and thyme) were tested for antifungal activity using the pores method. The effect of plant extracts on various denture base surfaces was determined using a disc diffusion test. Fifty-four discs of 6mm diameter and 2mm thickness were prepared from long cycle heat-polymerized methyl methacrylate PMMA, short cycle heat-polymerized PMMA, and thermoplastic monomer free microcrystalline polymer karadent and distributed into three groups:-ve control, basil, and thyme. The diameter of growth inhibition zones was determined after these discs were placed on a Sabouraud Dextrose agar surface and incubated for 24 hours at 37 C. Results: Both Origanum syriacum, and Ocimum basilicum were efficient against Candida albicans. Origanum Syriacum extracts showed a superior antifungal effect compared to the Ocimum basilicum extract with long and short curing cycle acrylic resin, but in Karadent the values of Ocimum basilicum were higher than those of Origanum syriacum extract.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3643
3650
https://edj.journals.ekb.eg/article_201900_bb8e18cffdcb23002a539a4111a67b0c.pdf
dx.doi.org/10.21608/edj.2021.91647.1760
The impact of different cleaning protocols on resin bond strength to polymer-infiltrated ceramic material
Shaimaa
Abo El-Farag
Associate Professor, Fixed Prosthodontics Dept, Faculty of Dentistry, Mansoura University and Horus University
(HUE), Egypt.
author
text
article
2021
eng
Purpose: This study measured and compared shear bond strength (SBS) of a composite resin cement with that of PICN material after different surface cleaning methods. Materials and Methods: Forty Vita-Enamic plates (10x7x2 mm) were fabricated using of a low speed, water-cooled diamond saw. All plates were air-borne particle abraded using 50µm Al2O3 then contaminated with saliva, after that all plates were classified into four groups (n=10): control group (CG) in which conventional cleaning with air-water spry was used, and three test groups as follow: ultrasonic cleaning (UCG), steam cleaning (SCG), Ivoclean cleaning (ICG). Composite resin discs (Nexcomp) were cemented to ceramic plates using self-adhesive resin cement (Charm Supercem). All bonded specimens were stored in 37°C water for 1 month then, thermocycled 1000 times in water baths between 5˚C and 55˚C. Shear bond strength (SBS) test was performed using a universal testing machine. Scanning Electron Microscope (SEM) was used for failure mode examination. Results: Different cleaning methods significantly increased SBS values of tested groups compared to control one (p=0.000). The highest mean SBS (MPa) was reported for (SC) test group (18.41±1.5 MPa) followed by (UC) test group (11.52±.99MPa). While the lowest mean SBS was observed for (CG) (4.00 ±.59 MPa). There was statistically significant difference between (SCG) and other groups (CG, UCG, ICG) (p=0.0001). There was no statistically significant difference between IC and UC test groups (p=0.2941). Conclusion: Within the limitation of the present study, the bond strength of self-adhesive resin cement to hybrid ceramics increased by different surface cleaning protocols.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
67
v.
4
no.
2021
3651
3662
https://edj.journals.ekb.eg/article_201902_e4a8a46945f67293f6e3f72ec8207b3d.pdf
dx.doi.org/10.21608/edj.2021.91153.1759