ORIGINAL_ARTICLE
A Finite element analysis of stress distribution in all on four system using different framework materials in the mandible
Statement of the problem: All on four immediate function approach rehabilitating mandibular arch is a successful rout of treatment for resorbed ridges, however its outcome depends on amount of stresses transferred to the surrounding structures. To improve mechanical properties of dental structures, stress analyses under various loading circumstances has become an integral part of researches. This study aimed to assess the effect of three different framework materials on stress distribution over implants and bone simulating materials using finite element analyses. Materials and methods: Three-dimensional finite element model was created. Bone and mucosa were modeled with simplification. The modeled parts were transferred to ANSYS for assembly, meshing, and analysis. The framework materials were (Cr Co, Titanium, and PEEK) to be studied under vertical and lateral loads. Results: Bone sensitivity to framework material was demonstrated as, increasing material elasticity reduces bone stresses. While total bone deformation of Cr Co and Titanium frameworks were equivalent, PEEK material showed the highest deformation. All implant complex components showed increasing stresses and deformation with reducing material elasticity. Under the proposed loads, no failure occurred in any model component. Conclusion: Within this study limitations, all materials tested were found to be suitable for usage as all on four system framework. Cr Co material showed the best performance, while Titanium was found nearly equivalent to it, and PEEK caused the highest stresses and deformations on bone and implant complex.
https://edj.journals.ekb.eg/article_120841_a3252dc760d6207448cd5cbaafe343d6.pdf
2020-10-01
2423
2430
10.21608/edj.2020.34524.1166
All on 4
Finite E. A
PEEK
Seham
Mohamed
sehamesmat@hotmail.com
1
Ahram Canadian University
LEAD_AUTHOR
ORIGINAL_ARTICLE
The effects of activated charcoal and calcium carbonate based toothpastes on surface properties of composite resin restorative materials.
Objectives: The aim of the study was to evaluate, in vitro, the surface roughness and microhardness of two different composite resin materials submitted to simulated tooth brushing with activated charcoal and calcium carbonate toothpastes.
Materials and Methods: Microfilled (Heliomolar) and nanohybrid (Tg-nanohybrid) composite resins were studied, 30 disc-shaped specimens were prepared from each composite, then divided to 3 groups (n=10); group A (control group): brushed with distilled water, group B: brushed with Perfect white (Black)® toothpaste group, and group C: brushed with Depurdent® toothpaste, with a powered toothbrush for 30 seconds daily for 7 days. Vickers Microhardness was measured at 10N load and the surface roughness was measured using a surface roughness tester, SEM examination of some selected samples after brushing was conducted. Two-way analysis of variance (ANOVA) and Kruskal-Wallis were used to analyze the data with 5% level of significance between the means of tested groups. Results: The two composites showed significant increase in surface roughness after brushing in all groups, the highest values occurred in nanohybrid/Depurdent group, while the lowest values were in microfilled/control group. Microhardness increased significantly in nanohybrid/Depurdent group and decreased in microfilled/Depurdent group, while no significant change in microhardness was noted after brushing with Perfect white (Black) in both composites compared to the control group. Conclusion The tested dentifrices significantly influenced the surface roughness and microhardness of microfilled and nanohybrid composite resins.
https://edj.journals.ekb.eg/article_120842_2ad50fa9393870060cc7e010ea817ad2.pdf
2020-10-01
2431
2438
10.21608/edj.2020.35084.1170
Activated charcoal
Calcium Carbonate
Vickers microhardness
Surface roughness
composite resin
Nancy
Farghal
nancyfarghal@gmail.com
1
Dental Biomaterials department, Faculty of dentistry, Tanta University, Tanta, Egypt.
LEAD_AUTHOR
Hend
Elkafrawy
elkafrawyhend@yahoo.com
2
Dental Biomaterials, Faculty of Dentistry, Tanta university, Tanta, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Poly ether-ether ketone veneered with composite Versus Porcelain fused to metal Full arch fixed screw retained prosthesis for atrophied mandibular ridges. One year randomized clinical and radiographic trial study
to investigate outcomes of Poly ether-ether ketone veneered with composite and porcelain fused to metal Full arch fixed screw retained prosthesis for patients with atrophied mandibular ridges. Eight edentulous patients complaining from mandibular ridge atrophy were randomly assigned into 2 groups; Group I included 4 patients who received 8 implants and porcelain fused to metal full arch fixed restoration, Group II included 4 patients who received 8 implants and PEEK restoration veneered with composite resin teeth. All implants were inserted using computer guided flapless surgical approach and loaded by restorations after 3 months of osseointegration. Clinical (plaque and gingival index, probing depth, implant stability) and radiographical (bone resorption using cone beam CT) evaluations were performed at time of prosthesis insertion, after 6 month and one year thereafter. Results: The survival was 90.7% and 100% in group I and group II respectively. Plaque and gingival indices increased with time in metal group only and PEEK group showed significant lower plaque and gingival indices than metal group after 6 and 12 months. Probing depth and bone resorption showed an increase values with passage of time in both groups and PEEK group showed significant lower probing depths and bone losses than metal group. Implant stability did not differ between groups or observation times was noted.Within limitations short term randomized trial, that PEEK veneered with composite full arch fixed screw retained prosthesis is advantageous than porcelain/metal restoration for patients with atrophied mandibular ridges as it showed favourable per-implant tissue health after one 12 months.
https://edj.journals.ekb.eg/article_120843_9c944592e0ce7f357a10eb48ba8a537d.pdf
2020-10-01
2439
2449
10.21608/edj.2020.35663.1173
Poly ether-ether ketone Restoration
Completely edentulous patients
Implant Supported Prosthesis
Ramy
Moustafa Ali
romela86go@gmail.com
1
Assistant Professor, Department of Prosthodontics, College of Dentistry, king Faisal University, Al Ahsa, kingdom of Saudia Arabia. Lecturer, Department of Removable prosthodontics, Faculty of Dentistry, Fayoum University, Fayoum, Egypt.
AUTHOR
Mohamad
Helmy
mohamadhosam51@gmail.com
2
Lecturer, Department of Removable Prosthodontics, Faculty of Dentistry, Assiut University, Assiut , Egypt
LEAD_AUTHOR
ORIGINAL_ARTICLE
Pink and white esthetic scores of polymer-infiltrated-ceramic-network and lithium disilicate implant hybrid abutment crowns: Randomized clinical trial
Objective: The aim of this study was to evaluate the effect of polymer-infiltrated-ceramic-network hybrid abutment crown on pink and white esthetics in comparison with lithium disilicate. Materials and methods: Eighteen patients requiring single unit implant restorations in the maxillary esthetic zone were enrolled in the study. Each patient received a single screw-retained hybrid abutment crown of either lithium disilicate (IPS e.max CAD) or polymer-infilitrated ceramic network (VITA ENAMIC) and was followed up for 6 months. The pink and white esthetics were evaluated at 0, 3 and 6 months timepoints using PES/WES index. Results: Regarding the combined PES/WES and the PES, no statistically significant difference was found between IPS e.max CAD and VITA ENAMIC hybrid abutment crowns at any timepoint. However, regarding the white esthetic score, a statistically significant difference was found between the two groups, favouring IPS e.max CAD. Conclusion: Within limitations of this clinical study, it could be concluded that IPS e.max CAD hybrid abutment crowns can yield satisfactory pink and white esthetic outcomes, when performed in well selected cases. VITA ENAMIC hybrid abutment crowns can yield clinically acceptable cumulative pink and white esthetic scores, however single elements of white esthetics, such as color, surface texture, translucency and characterization are significantly threatened by time.
https://edj.journals.ekb.eg/article_120844_fc24835a6f8bb8fbae6caa7fce80bbb5.pdf
2020-10-01
2451
2458
10.21608/edj.2020.29814.1125
hybrid abutment crown
pink esthetic score
white esthetic score
Lithium Disilicate
Vita Enamic
Nourhan
Elrifaie
nourhanelrifaie@gmail.com
1
Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University
LEAD_AUTHOR
Reham
Elbasty
reham.elbasty@dentistry.cu.edu.eg
2
Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University
AUTHOR
Ahmed
Naguib
ahmed.naguib@dentistry.cu.edu.eg
3
Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University
AUTHOR
ORIGINAL_ARTICLE
Three years follow up study of the effect of implant abutment connection on bone resorption around implants placed at different crestal levels
Statement of problem: Implant abutment connection may affect the stresses and strains induced at the peri-implant area and influence crestal bone resorption around implants at different levels of crestal placement. Materials and Methods: Implants were divided into two groups: internal hexagon (Legacy™ 2, Implant Direct) and conical hybrid connection (AnyRidge; MEGAGEN). Each group was further subdivided into three subgroups depending on the location of surgical placement (subcrestal, crestal, or supracrestal) of the implant platform. Each case was evaluated radiographically and linear measurements of bone resorption were made from the implant's apex to the first point of bone-to-implant contact at prostheses loading and after 6, 12, 24 and 36 months. Data were collected, tabulated and statistically analyzed using t Student test and ANOVA test followed by Tukey’s test. Results: No Statistical significant differences were found between the main tested two groups (P ≥ 0.05), however there were statistical significant differences between the position groups with the conical hybrid subcrestal group showing the lowest values of peri-implant bone after three years of prostheses insertion. Conclusions: Conical hybrid implant abutment connection showed less crestal bone resorption around implants than internal hexagon implant abutment connection in any position of placement. Subcrestal implant surgical positioning showed the less crestal bone resorption followed by supracrestal. Crestal implant positioning should be avoided whenever possible.
https://edj.journals.ekb.eg/article_120845_01c946635ef592be84e02a20fc76aa6a.pdf
2020-10-01
2459
2466
10.21608/edj.2020.33471.1155
Keywords: implant abutment
internal connection
conical hybrid
crestal bone resorption
Ahmed
Alam-Eldein
ahmedmohi17@gmail.com
1
prosthetic department, faculty of dentistry,Tanta university
LEAD_AUTHOR
Tamer
Mostafa
2
Associate Professor, Prosthodontic Department, Faculty of Dentistry, Tanta University
AUTHOR
ORIGINAL_ARTICLE
Effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia
Statement of problem: Zirconia undergoes phase transformation due to low temperature degradation LTD which could deteriorate its optical properties. Objectives: Current study was conducted to evaluate the effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia. Materials and methods: Two commercially available zirconia products, high-translucent PSZ (Prettau®, Zirkonzahn) and ultra-translucent FSZ (Prettau®, Anterior, Zirkonzahn) were assessed. 80 disc shaped specimens (12×1 mm) were prepared; half of the specimens were shaded using acid-free coloring solution. Half of the specimens were subjected to accelerated aging using autoclave (134°c at 2 MPa) for 5 hours. The specimens were divided into 4 subgroups. Non-shaded, non-aged (control), (non-shaded, aged group), (shaded, non-aged group) and (shaded, aged group). Contrast ratio CR and translucency parameter TP were evaluated in each subgroup using reflective spectrophotometer. X-ray diffraction analysis was used to measure the amount of tetragonal to monoclinic phase transformation. Microstructural analysis was evaluated using atomic force microscope. SPSS program was used to evaluate the data (P≤0.05). Results: FSZ recorded higher translucency parameter and lower contrast ratio than PSZ; which were significantly affected by shading and aging in all subgroups except for non-shaded aged subgroups of PSZ. Conclusions: Shading and aging induced tetragonal to monoclinic transformation in PSZ and FSZ which lead to changes in their optical properties.
https://edj.journals.ekb.eg/article_120846_2d94d60878f0b248fc627e4d28974aad.pdf
2020-10-01
2467
2479
10.21608/edj.2020.33503.1158
Monolithic Zirconia
hydrothermal aging
shading
Contrast Ratio
Translucency parameter
Marwa
Abdel latif
mirodomy@gmail.com
1
Dental Biomaterials Department. Tanta University
LEAD_AUTHOR
Gehan
el-olimy
gae53711@hotmail.com
2
biomaterials-faculty of dentistry-tanta university
AUTHOR
Manal
elebiary
manalahmed727@yahoo.com
3
head of the dental biomaterials department , faculty of dentistry, tanta university
AUTHOR
ORIGINAL_ARTICLE
THE EFFECT OF ULTRASONIC SCALING ON MICROLEAKAGE AROUND ZIRCONIA CROWN MARGINS LUTED WITH TWO RESIN CEMENTS
Aim: To evaluate the effect of ultrasonic scaling on microleakage around crown margins after being cemented with two resin cements. Materials and Methods: Thirty two maxillary premolars were prepared to receive zirconia crowns. Specimens were divided into two groups (n=16): Group I, crowns cemented with self-etch adhesive resin cement ( Panavia F 2.0 ), Group II, crowns cemented with self-adhesive resin cement ( Panavia SA Cement Plus ). Each group was further subdivided into two subgroups according whether or not piezoelectric ultrasonic scaling was performed. All specimens were thermocycled then immersed in basic fuchsine dye before being sectioned buccolingually. Microleakage was then evaluated using the stereomicroscope. Microleakage percentage was determined and statistical comparisons were conducted using ANOVA followed by post hoc test. Results: There was no statistically significant difference in microleakage percentage for zirconia crowns when being cemented with self-etch resin cement (Panavia F 2.0) with or without the application of ultrasonic scaling at the crown margins (P1=0.017). However, there was a significant difference in microleakage of specimens cemented with the self-adhesive resin cement (Panavia SA Cement Plus), where higher microleakage percentage was noticed after application of ultrasonic scaling than those without treatment ( P2<0.001). Conclusion: Ultrasonic scaling could affect tooth/crown margin interface with subsequent microleakage. Self-etch adhesive resin cement showed higher resistance to ultrasonic scaling with resultant less microleakage compared to self-adhesive resin cement. Both types of resin cement could be used clinically, since the microleakage values of self-adhesive resin cement were within acceptable range compared to other studies.
https://edj.journals.ekb.eg/article_120847_c5c2164edcb01e1d070428cff6a66721.pdf
2020-10-01
2481
2489
10.21608/edj.2020.33696.1161
Microleakage
ultrasonic scaling
Zirconia Crowns
resin cement
Amir
Azer
amirazer6@hotmail.com
1
Conservative dentistry dept, Faculty of Dentistry, Alexandria University, Alexandria ,Egypt.
LEAD_AUTHOR
ORIGINAL_ARTICLE
Effect of surface finishing protocols on color and translucency of zirconia reinforced lithium silicate glass-ceramic after thermo-mechanical aging and different staining solutions
Objectives: To investigate the color stability and translucency of zirconia-reinforced lithium silicate glass-ceramic (ZLS) prepared with different surface finishing procedures after thermo-mechanical aging and immersion in different beverages. Sixty samples were fabricated from heat-pressed and milled ZLS. All samples were finished and divided into three groups (n=20), according to the finishing methods; (CD) polished and fired, (CD) glazed and fired, and (CP) glazed and power fired. The specimens were subjected to aging using chewing simulator integrated with thermocycling protocol. Then, each group was divided into 4 equal subgroups (n = 5) according to exposure to immersion medium (coffee, tea, Coca-Cola and distilled water). Color and translucency parameter (TP) were measured according to CIELAB color space using spectrophotometer at baseline and after subjecting the specimens to aging and different staining solutions. Changes in color (ΔE) and TP (ΔTP) were calculated. The data was analyzed using the analysis of variance (ANOVA) and Tukey’s post hoc test (p < 0.05). Aging and staining significantly affected the baseline color and decreased TP of all specimens. Generally, regarding the tested groups, CD polished showed the highest ΔE and ΔTP (p <0.05). Coffee had the most significant effect on ΔE (p < 0.05). For each staining solution subgroup, polished CD had the highest ΔE. Conclusions: Aging and staining beverages had a significant effect on color stability and decreased translucency of all surface finished ZLS. Polished celtra duo showed the highest ΔE and ΔTP. Coffee had the most significant effect on the color change of all surface finished ZLS.
https://edj.journals.ekb.eg/article_120848_d70ba4457ac89a2ba493335c626e8eeb.pdf
2020-10-01
2491
2502
10.21608/edj.2020.34025.1162
Zirconia-reinforced lithium silicate
Translucency parameter
Color change
aging
Mohamed
Mohamed
drmohamedaziz@gmail.com
1
Fixed prosthodontics, faculty of dentistry, Ahram Canadian University, Giza, Egypt
LEAD_AUTHOR
Maha
Gomaa
mahafouad123@yahoo.com
2
Fxed prosthodontics, faculty of dentistry, Ahram canadian university,Giza, Egypt
AUTHOR
ORIGINAL_ARTICLE
The effect of two different attachments on patient satisfaction in mandibular class II and III ACP ridges with single implant-retained mandibular overdentures
Background: The American collage of Prosthodontics (ACP) classified completely edentulous patients into four classes based on specific diagnostic criteria. The aim of this randomized clinical trial is to compare patient satisfaction scores between ball and CMLOC attachment in class II and class III ACP for a single implant retained mandibular over-denture after 2 weeks of loading 1 and 2 year follow up. Materials and Methods: Eighty completely edentulous patients were recruited from the out-patient clinic of Prosthodontics Department –Cairo University. Patients with Class II and III ACP classification were included . All patients received a single implant in the mid line of the mandible. After a 3 month healing period, patients were randomized using sealed envelopes into ball attachment group and a CMLOC attachment group. Patient satisfaction questionnaire was used to record patient satisfaction for both groups 2 weeks after loading, then 1 and 2 years later. Results: For the Ball group, there was no statistically significant difference – in patient satisfaction scores between both ACP classes at all follow up periods. As for the CMLOC group, no statistically significant difference in patient satisfaction scores was found between both classes 2 weeks after loading, while at 1 year follow up, patients with class III showed statistically significant better patient satisfaction and at 2 year follow up there was no significant difference between both classes. Conclusion: The resiliency of the attachment and the associated denture base rotation seems to have a greater influence on patient satisfaction than the ACP classification.
https://edj.journals.ekb.eg/article_120849_f6b92a08ee6c2e33a062592d3c5386f9.pdf
2020-10-01
2503
2517
10.21608/edj.2020.37411.1190
ACP classification
Single implant retained over denture
Ball attachemnt
CM LOC attachment
patient satisfaction
Nouran
Abdel Nabi
nouranabdelnabi@dentistry.cu.edu.eg
1
faculty of dentistry-Cairo university
LEAD_AUTHOR
ORIGINAL_ARTICLE
In-vitro evaluation of remineralization efficiency of chicken eggshell slurry on eroded deciduous enamel
OBJECTIVES: The present study evaluated the re-mineralizing efficiency of CESP on experimentally eroded deciduous tooth enamel by Claritin syrup. MATERIALS AND METHODS: 20 extracted deciduous teeth had been selected and stored in normal saline. Each tooth was cut in a labiolingual direction into 2 halves, one half used as a control and the other used as study. Demineralization of all specimens were done by twice daily immersion in Claritin syrup for ½ an hour for 12 days to form enamel erosion. Remineralization of the study group was done by using CESP slurry twice daily application for 3min. for 10 days. Surface roughness of the specimens was measured by surface profile gauge and microhardness evaluation was done using Vickers tester. Resulted data were tabulated and ana1yzed statistically by t-test with 5% significance 1evel RESULTS: There was statistically significant increase in roughness values after erosion with Claritin syrup (P<0.001). however, it was significantly decreased after remineralization (P=0.01). There was statistically significant decreased mean value of microhardness after erosion with Claritin syrup (P<0.001). however, it was significantly increased after remineralization (P=0.01). CONCLUSION: CESP slurry is a valuable topical treatment in deciduous teeth erosion since it decreased the roughness and increased the microhardness of the enamel surface in-vitro
https://edj.journals.ekb.eg/article_120850_97c5a717593bdd806f58bcfec1b8bd26.pdf
2020-10-01
2519
2528
10.21608/edj.2020.37351.1189
Dental erosion
CESP
Surface roughness
Vickers microhardness
Gehan
el-olimy
gae53711@hotmail.com
1
biomaterials-faculty of dentistry-tanta university
LEAD_AUTHOR
ORIGINAL_ARTICLE
Radiographic Assessment of Accuracy of Fit for Different Conical Connection Abutments on Tapered Implants
Purpose: This study aimed to evaluate the accuracy of fit between implant and abutment using different types of abutments. Methods: A total of 32 titanium implants with 3.5mm diameter, 12mm length and conical connection were used in this study. All implants were randomly divided into four equal groups according to the type of the abutment used as follows: Group I (Control Group): Ready-made Titanium abutment . Group II: Custom-made Gold abutment . Group III: Custom-made Co-Cr abutment with prefabricated machined Co-Cr base . Group IV: Custom-made Fully Casted Co-Cr abutment. Abutments for groups II, III, IV were fabricated using the conventional casting technique to obtain custom-made gold abutments for group II and custom-made Co-Cr abutments for groups III, IV. All the abutments were tightened at 35 N/cm using manual Torque Wrench. The x-ray sensor was placed parallel to the implant and a radiograph was taken for each sample. The distance from the end of the base of the abutment till the beginning of the screw holes of the implant was measured in mm. Data were statistically studied. Results: Results showed that Group IV had the statistically significantly highest mean value. Group III showed statistically significantly lower mean value. There was no statistically significant difference between Group I and Group II; both showed statistically significantly lowest mean values. Conclusions: Within the limitations of this study, it was concluded that: Custom-made Co-Cr abutments with prefabricated Co-Cr base revealed promising results. Casted connections don’t seem to be a good alternative to machined connections.
https://edj.journals.ekb.eg/article_120851_d7c972fbcf7317b3269b7f7d140bf2e2.pdf
2020-10-01
2529
2539
10.21608/edj.2020.37695.1196
Ready-made titanium abutment
custom-made gold abutment
Custom-made Co-Cr abutment
conical connection
abutment fit
Shereen
Elsayed
shereenabdelmeguid@gmail.com
1
Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University, Cairo, Egypt. Oral and Maxillofacial Department, Faculty of Dentistry, Umm Alqura University, Makkah, KSA.
LEAD_AUTHOR
Alaa
Makke
alaamakke@hotmail.com
2
Oral and Maxillofacial Surgery Department, Faculty of Dentistry, Umm Alqura University, Makkah, KSA
AUTHOR
Khaled
Elbanna
khalidbanna@yahoo.com
3
Oral and Maxillofacial Surgery, Faculty of Dentistry, Umm Alqura University, Makkah KSA
AUTHOR
ORIGINAL_ARTICLE
Marginal Accuracy and Fracture Resistance of Posterior Crowns Fabricated from CAD/CAM PEEK Cores Veneered with HIPC or Nanohybrid Conventional Composite
Statement of problem:Veneered polyether ether ketone (PEEK) is a recent alternative choice for fixed dental prostheses. There is lack of data about the effect of veneering techniques of CAD/CAM PEEK cores on marginal accuracy and fracture resistance of such restorations. Purpose:To investigate the veneering techniques of CAD/CAM PEEK cores influence on the marginal accuracy and fracture resistance of posterior crowns. Methods:Twenty duplicated epoxy resin dies of prepared mandibular first molar to receive ceramic crown were fabricated. 20 CAD/CAM PEEK cores were fabricated and divided into two groups (n=10) based on the veneering technique;Group (A):HIPC veneered PEEK cores and Group (B):nano-hybrid crea.lign composite veneered PEEK cores (control group).Marginal gap was evaluated at 4 equidistant points on each crown by digital microscope before and after ageing equivalent to clinical 6 months service.The fracture load was assessed after ageing. The data were statistically analyzed using one-way ANOVA,pair-wise Tukey’s post-hoc and Student t tests to reveal the significance between groups (P ≤ 0.05). Results:The marginal gap was significant between before (59.638±5.91µm and 58.587±7.74µm) and after ageing (79.167±11.62µm and 72.222±6.53µm) for A and B groups respectively (p=0.0019/0.0039<0.05). ANOVA test showed significant difference before or after ageing between groups (p= 0.0002<0.05) which was not detected by Tukey’s test (p>0.05).B group showed significant higher fracture resistance mean value (1674±224.8 N) than A group (1294±282 N) (p=0.0164 < 0.05). Conclusions:The marginal gap and fracture load values recorded by posterior crowns fabricated from CAD/CAM PEEK cores veneered with HIPC or nano-hybrid composite were all within the clinically acceptable range.
https://edj.journals.ekb.eg/article_120852_e8dc3e6f3318f0009303eabff8752176.pdf
2020-10-01
2541
2552
10.21608/edj.2020.40096.1217
HIPC
nano-hybrid composite
PEEK
CAD/CAM
marginal gap and fracture resistance
Marwa
Beleidy
marwa_beleidy@hotmail.com
1
Fixed Prosthodontics Department, Faculty of Dentistry, October 6 Univeristy, Giza, Egypt.
LEAD_AUTHOR
Ahmed
Ziada
dr_ahmadziada@hotmail.com
2
Fixed Prosthodontics Department, Faculty of Dentistry, Benisuef University, Benisuef, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Impact of palatal coverage for maxillary implant assisted overdenture on respiratory performance. Spirometric evaluation.
Objectives: The purpose was to determine the influence of maxillary implant overdentures with and without palatal coverage on spirometric parameters. Materials and methods: 14 healthy edentulous patients were participated in this study. All patients were received 4 implants in maxillary arch in canines premolars areas and 2 implants in mandibular canines areas. All patients were received 2 maxillary implant overdentures “with and without palatal coverage” and one mandibular implant overdenture. Locator attachments were used to anchor the overdentures. Spirometry test was performed in three different oral conditions: without prosthesis , with maxillary implant overdenture with palatal coverage, and with palateless implant overdenture. The test was done after 2 months of each overdenture delivery. Spirmetric parameters as, Vital capacity (VC), Peak expiratory flow (PEF), Forced expiratory volume in 1 sec. (FEV1), FEV1/FVC (Forced vital capacity), and Maximum expiratory flow between 25% and 75% (MEF25-75) were evaluated. Results: There was statistically significant reduction in VC, FEV1/FVC, and MEF25-75 for without prosthesis compared to maxillary implant overdenture with or without palatal coverage (p <0.05). Also, there was statistically significant increase in VC, FEV1/FVC, and MEF25-75 for palateless implant overdenture compared to maxillary implant overdenture with palatal coverage (p <0.05). While there were no significant differences between the different oral conditions in FEV1, and PEF (p >0.05). Conclusion: Covering the palate by dental prosthesis had an adverse effect on respiratory function as using the palateless implant overdenture showed improvement in respiratory performance in comparison to maxillary implant overdenture with palatal coverage.
https://edj.journals.ekb.eg/article_120853_bdf1abb503115539df409e775252786c.pdf
2020-10-01
2553
2561
10.21608/edj.2020.40255.1218
Maxillary implant overdenture
palateless
Spirometric evaluation
Abdallah
Ibrahim
abdallahs79@hotmail.com
1
prosthodontics Department, Faculty of Dentistry, Mansoura University, Mansoura , Egypt
LEAD_AUTHOR
mohamed
Elgamal
melgamal6@gmail.com
2
Chest Department, Faculty of Medicine, Mansoura University Mansoura, Egypt
AUTHOR
mohamed
Elgamal
mohamedelgamal2015@yahoo.co
3
Prosthodontics Department, Faculty of Dentistry, Mansoura University Mansoura, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Effect of Different Beaching Protocols on Biaxial Flexural Strength and Micro Hardness of Two Ceramic Materials
Purpose: The aim of this study was to evaluate the effect of different bleaching protocols on biaxial flexural strength and micro hardness of two ceramic materials. Material and Methods: A total of 112 discs, 56 discs of each material, were prepared from Celtra® Duo and VITA ENAMIC® with 10mm diameter and 1.2mm thickness. Each material was divided into 4 groups (n=14) according to the bleaching protocol done: Group 1 Control group “no bleaching”, Group 2 home bleaching “Carbamide Peroxide 22%”, Group 3 home bleaching “Hydrogen Peroxide 14%” and Group 4 In-office bleaching using diode Laser. For each material, half the number of discs in each group (n=7) were subjected to Biaxial Flexural Test using Universal Testing Machine Instron-3345 together with Instron BlueHill® universal software, while the other half was subjected to Micro-Hardness Test using Tukon™ 1102 Wilson® Hardness Tester. Data was represented by mean and standard deviation (SD) values. Two-way ANOVA was used to study the effect of different tested variables and their interaction on biaxial flexural strength (Mpa) and micro-hardness, The significance level was set at p ≤0.05 within all tests. Statistical analysis was performed with IBM® SPSS® Statistics Version 26 for Windows. Results: For Biaxial Flexural Strength and Micro-hardness; Celtra duo samples had a significantly higher value than samples made with Vita Enamic for all bleaching groups. Conclusion: Bleaching resulted in a significant diminution for both biaxial flexural strength and surface micro-hardness of Celtra Duo and Vita Enamic.
https://edj.journals.ekb.eg/article_120854_22ba24a9ec60e5fe2b7e2ae3876c270d.pdf
2020-10-01
2563
2573
10.21608/edj.2020.40787.1230
bleaching techniques
laser bleaching Vitaenamic
Celtra Duo
flexural strength and Micro hardness
Ghada
Hussein
ghada.abdelstar@dent.asu.edu.eg
1
10 abo dawood el zahery st
LEAD_AUTHOR
nourhan
wagdy
nourhanwagdyreda@gmail.com
2
fixed prosothodontics departement faculty of dentistry ain shams university
AUTHOR
mohamed
nasser
mnasser@dent.asu.edu.eg
3
restorative departement. faculty of dentistry. Ainshams university
AUTHOR
ORIGINAL_ARTICLE
Evaluation of the Stresses induced from zirconia teeth on implant retained mandibular overdenture (strain gauge analysis)
Objective: to compare stresses induced from porcelain ,zirconia and acrylic teeth on implant retained mandibular over denture. Material and methods: For group I Porcelain teeth were retained mechanicaly in the finished denture and a stone occlussal index was made. For group II; the finished complete dentures with porcelain teeth was scanned . An impression was made of the denture with porcelain teeth then poured. The teeth were reduced to simulate teeth preparation form for crowns , the prepared abutments were scanned.The computer program integrated the initial scan of fully contoured porcelain teeth onto the tooth preparation scan for milling of the fully anatomical zirconia restorations. The zirconia teeth were attached with tooth-colored acrylic resin to the denture base. For group III , the denture with porcelain was duplicated. Tooth colored acrylic resin was applied into the mold. Universal testing machine was used to apply static load on the occlusal surface of the right first molar in vertical direction and microstrains were recorded . . Results: Two-way ANOVA test showed that the highest mean value was found in (Porcelain) while the least mean was found in (Acrylic). Post hock test showed significant difference between porcelain teeth group and other groups. It revealed statistically insignificant differences between zirconia and acrylic teeth . Conclusions: zirconia teeth transmits less stresses than porcelain teeth and more stresses than acrylic teeth while porclain teeth transmits more stresses than both zirconia and acrylic teeth and finally the acrylic teeth showed the least amount of stressses
https://edj.journals.ekb.eg/article_120855_ea9ea08345b0b7543f52b1998d359e26.pdf
2020-10-01
2575
2585
10.21608/edj.2020.40764.1229
porclain teeth
zirconia teeth
acrylic teeth
implant retained mandibular overdenture
Ahmed
ahmed shawky
dr-ahmedosama@hotmail.com
1
Assistant professor, prosthodontic department,Faculty of dentistry Ain-shams university
LEAD_AUTHOR
Hebatallah
Mohamed
drhobosh@hotmail.com
2
Assistant professor of Prosthodontics.Faculty of Dentistry.Ain Shams University
AUTHOR
ORIGINAL_ARTICLE
Partial extraction therapy versus conventional immediate implantation and their effect on vertical and buccal horizontalsuppoting bone resorption of mandibular overdenture
The Purposeof this study is to estimate the effect of partial extraction therapy (PET) with immediate implantation versus conventional immediate implantion in preserving vertical height and labial thickness supporting two implants retaining overdenture Material and method: Fourteen male patients of 60 - 70 years age having completely edentulous maxillary arch and bilateral standing canines in the mandibular arch indicated for extraction were selected to participate in this study and allocated into 2 groups, Group I: Patients of this group were rehabilitated with implant retained mandibular overdenture with two immediately placed implants for the bilateral canines while Group II: Patients of this group were rehabilitated with implant retained mandibular overdenture with two immediately placed implants following one of the PET( socket shielding technique) for the bilateral canines. Radiographic evaluation using CBCT was done to evaluate the amount of vertical bone loss and thickness of labial plate throughout the follow –up period Results : there was a significant decrease in thickness of labial plate of bone in group I and II through out the follow up period, and on comparing the two groups there was statistical significance after one year.There was significant increase in vertical bone loss in group I and II through-out the follow up period ,meanwhile on comparing the two groups regarding the vertical bone loss there was statistical significance after 6 months and after one year.(p≤ 0.05) Conclusion it could be concluded that partial extraction technique (socket shielding) enhances immediate implantation osseointegration and preserves supporting bone
https://edj.journals.ekb.eg/article_120856_20f53d9ce6139deb6df63166ad152c55.pdf
2020-10-01
2587
2596
10.21608/edj.2020.40759.1228
partial extraction therapy
immediate implantation
overdenture
Ahmed
ahmed shawky
dr-ahmedosama@hotmail.com
1
Assistant professor, prosthodontic department,Faculty of dentistry Ain-shams university
LEAD_AUTHOR
noha
Hassan Nawar
noha_nawar@yahoo.com
2
Assistant professor, prosthodontic department,Faculty of dentistry Ain-shams university
AUTHOR
ORIGINAL_ARTICLE
IN VITRO EVALUATION OF THE MARGINAL INTEGRITY OF MONOLITHIC CERAMIC CROWNS UTILIZING DIFFERENT MACHINABLE BLOCKS FABRICATED FOR MINIMALLY INVASIVE VERTICAL PREPARATION DESIGNS
Purpose: This study aimed to evaluate the marginal adaptation of monolithic ceramic crowns with minimally invasive vertical preparation design utilizing different machinable blocks. Materials and method: Stainless steel die was designed to simulate all ceramic crown preparation with 0.1mm featheredge margin. A total of 50 monolithic crowns were constructed from five different tested ceramic materials; 10 crowns from each material: Group EX for lithium disilicate ceramic (IPS. emax), group VE for polymer infiltrated ceramic (Vita Enamic), group CD for zirconia-reinforced lithium silicate ceramic (glazed Celtra Duo), group TZ for translucent zirconia (inCoris TZI) and group HTZ for high translucent zirconia (Ceramill zolid zirconia). After surface treatments, adhesive cementation and thermocycling, stereomicroscope with a digital camera and image analysis software were used to measure the vertical gaps between the cervical margin of the crown and the outer end of the finish line. The mean vertical gap for each crown was then calculated. Results: High translucent zirconia crowns (group HTZ) showed the lowest mean marginal gap value (29.04 ±7.77μm) with statistically significant difference than all the other tested materials. While e.max crowns EX showed the highest mean marginal gap value (95.37 ±13.84μm) which was statistically significant from all the other tested groups. Conclusion: High translucent zirconia crowns showed superior marginal adaptation compared to all other tested materials, while lithium disilicate crowns showed the least accuracy. For the all tested materials, the marginal vertical gap readings recorded in this study were within the limits of clinically acceptable standards.
https://edj.journals.ekb.eg/article_120857_f1300124107417f97b43046d6a7eac08.pdf
2020-10-01
2597
2606
10.21608/edj.2020.40995.1234
monolithic crowns
All Ceramic
Hybrid ceramic
marginal adaptation
vertical preparation
Marwa
Wahsh
marwa.wahsh@dent.asu.edu.eg
1
fixed Prosthodonics, Faculty of Dentistry, Ain shams University, Cairo, Egypt
LEAD_AUTHOR
Doaa
Taha
doaataha@asfd.asu.edu.eg
2
Fixed Prosthodontics, Faculty of Dentistry, Ain shams University, Cairo, Egypt
AUTHOR
ORIGINAL_ARTICLE
Implant Satbility and Peri-implant Marginal Bone Loss Around Two Different Threads Design Implants
The aim of this study was to evaluate implant stability and the peri-implant marginal bone loss around two different threads design implants; conventional macro-threads design implants and crestal micro-threads design implants. Materials and methods: A total of 14 implants of 3.5 mm diameter × 11.5 mm length having two different threads designs were divided into two groups, (n = 7): group A; implants with conventional macro-threads design and group B; implants with crestal micro-threads design were placed in maxillary permolar area in partially edentulous patients. Stability was evaluated by insertion torque and resonance frequency using an Osstell device at baseline (time of implant insertion),15, 30, 45 and 60 days follow up periods, while peri-imlant marginal bone loss was measured by CBCT taken at baseline (time of implant insertion) 3, 6,12 and 18 months (one year after loading) follow up periods. Results: At the end of follow up period, group B (Implants with crestal micro-thread design) showed statistically significant higher mean values regarding primary and secondery implant satbility inaddition to statistically significant lower mean values regarding peri-implant marginal bone loss when compard to group A ( implants with conventional macro-threads design) . Conclusion: Implants with crestal micro-thread design showed better stability and less peri-implant marginal bone loss than the conventional macro-threads design implants.
https://edj.journals.ekb.eg/article_120858_9114d8a7d374195760608e5cadf93070.pdf
2020-10-01
2607
2619
10.21608/edj.2020.41252.1237
marginal bone loss
Implant design
implant stability
Micro-thread Implant
maha
kamal
maha.kamal@bue.edu.eg
1
removable prosthodontic department, faculty of dentistry, British University in Egypt.
LEAD_AUTHOR
ORIGINAL_ARTICLE
Assessment of hybridization and push out bond strength of fiber post after endodontic retreatment. An invitro study
Objective: The aim of this study was to assess hybridization and push out bond strength of fiber post after endodontic retreatment. Materials and methods: 10 freshly extracted human canines were collected having single root canal, samples were decoronated. Endodontic treatment was made to all samples. Samples were inserted into resin blocks. Then randomly divided in to: group I (control group) (5n) drilling to prepare post space followed by post cementation using total etch cement; while in group II (retreatment group) (5n) endodontic retreatment was made followed by drilling and post cementation as group one. Samples were sectioned into six sections of 1.5 mm thickness. Push-out test was performed using universal testing machine. Scanning of the root interface was made by SEM. Results: Group I showed significantly higher mean push-out bond strength (11.55 MPA) than Group II (7.93 MPA). Coronal (13.13 MPA) and middle root levels (9.62 MPA) showed significantly higher mean push-out bond strength than apical level (6.48 MPA). GI showed significantly higher mean push-out bond strength (16.06 MPA) than GII (10.19 MPA) at coronal level. At middle and apical levels; there were no significant difference. SEM showed resin tags and hybridization within dentin in GI while in GII there was an ill-defined hybrid layer at interface. Conclusions: Endodontic retreatment showed significant adverse effect on fiber post push-out bond strength. Root level affected fiber post push-out bond strength only in endodontically treated teeth. Interface of the endodontically treated teeth showed hybrid layer while in endo-retreatment gaps and void were seen.
https://edj.journals.ekb.eg/article_120859_9e7e4687fc6317e8e31ba46d3e2f8938.pdf
2020-10-01
2621
2632
10.21608/edj.2020.41787.1244
endodontic retreatment
Fiber post
Push out test
Noha
Elkhodary
noha.elkhodary@dentistry.cu.edu.eg
1
Faculty of Dentistry, Cairo University
LEAD_AUTHOR
Karim
Aboubakr
karimaboubakr@dentistry.cu.edu.eg
2
Faculty of dentistry, Cairo university
AUTHOR
ORIGINAL_ARTICLE
Effect of Multiple Firing Cycles on the Physical Properties of Three Pressable Lithium Silicate Glass Ceramics
Statement of the problem To achieve esthetic perfection with dental ceramics, ceramic dental restorations may need to undergo multiple firing cycles for characterization. The behavior of lithium silicate ceramics when exposed to those firing cycles is not well understood, the way it might affect the optical and mechanical properties of restorations. Purpose The aim of this in-vitro study was to investigate the effect of multiple firing cycles on translucency and biaxial flexure strength Of 3 different types of pressable lithium silicate ceramics. Materials and methods A total of 72 disc shape specimens (10mm diameter and 1mm thickness) were fabricated by heat pressing of LT A1 shaded ingots. 24 specimens of Celtra press and the same number of IPS e.max press and Livento press lithium silicates materials. Each material group were subdivided in to three subgroups (8 samples per group) according to the number of firing cycles. One, three, and five firing cycles’ protocols were constructed, to simulate the firing protocols of the three common laboratory fabrication techniques (staining, cutback, and layering) of glass ceramic restorations. Translucency parameters and biaxial flexural strength were evaluated for specimens to detect the effect of multiple firing cycles. Results All tested materials showed statistically significant decrease in translucency parameters values with multiple firing cycles. No significant effect was detected on the biaxial flexural strength values after repeated firing. Conclusion Translucency of tested materials is negatively affected by multiple firing cycles. Multiple firings have no effect on the biaxial flexural strength of lithium silicate ceramics.
https://edj.journals.ekb.eg/article_120860_8d782a1c1053d68d1981f2313bebc5b2.pdf
2020-10-01
2633
2639
10.21608/edj.2020.42266.1253
Pressable ceramics
Biaxial Flexural Strength
translucency
Multiple firing cycles
Lithium silicate
Ahmed
Radwan
ahmedshawkyradwan@gmail.com
1
Fixed Prosthodontics, Faculty of dentistry, Ain Shams University,Cairo, Egypt
LEAD_AUTHOR
Ingy
Nouh
ingynouh@asfd.asu.edu.eg
2
fixed Prosthodontics, Faculty of dentistry,Ain Shams University, Cairo, Egypt
AUTHOR
Ahmed
Thabet
dentsabet@hotmail.com
3
Fixed Prosthodontics, Faculty of dentistry, Ain Shams University, Cairo, Egypt
AUTHOR
ORIGINAL_ARTICLE
Effect of Different Premolar Endocrown Preparation Designs on the Trueness of Different Virtual Impression Techniques.
APurpose : the study was designed to evaluate the trueness of two premolar endocrowns preparation design with different virtual impression techniques Material and methods: Two premolar teeth were endodontically treated, prepared using a CNC machine. Tooth A was prepared to have a flat occlusal surface, while tooth B was prepared to have a 45º cusp anatomy inclination. For each tooth, a total of 40 different impressions were obtained. They were divided into 4 groups (n=10) as follows: Group 1; direct scan using Medit i500, group 2; direct scan using trios 3shape, group 3; Putty and light impression were taken and impression was scanned using Identica Hybrid, group 4; Impressions were poured in gypsum and tooth model was scanned using identica hybrid. Both CAD reference models and all (STL) files (n=80) were loaded into a 3D reverse engineering software (Geomagic QualifyTM 2012, Geomagic, Morrisville, USA). By using this method, for each superimposition, the deviation at each measurement point was recorded as a root mean square. Results : There statistically significant differences between different groups. Anatomical reductions showed statistically significant higher trueness when compared to flat occlusal reduction. As for impression method, no statistically significant differences between direct Trios 3Shape scanning and impression scanning. However, both showed higher trueness when compared to direct Medit i500 scanning and cast scanning. Conclusion : Anatomical preparation can be reproduced more accurately than flat preparation. Scanning direct impression produce more accurate virtual impression.
https://edj.journals.ekb.eg/article_120861_63cf13e33058ad9787fd496d269895c0.pdf
2020-10-01
2641
2648
10.21608/edj.2020.42549.1255
endocrown preparations
premolar endocrowns
virtual impression technique
Ghada
Hussein
ghada.abdelstar@dent.asu.edu.eg
1
10 abo dawood el zahery st
LEAD_AUTHOR
ORIGINAL_ARTICLE
Influence of Different Sintering Protocols on Translucency and Fracture Resistance of Monolithic Zirconia Crowns
Purpose : The current study investigated the effect of different sintering protocols (long, speed and high- speed cycles) on translucency and fracture resistance of monolithic zirconia crowns. Materials and Methods: 30 monolithic zirconia crowns were CAD/CAM fabricated from translucent BruxZir zirconia blanks. The crowns were divided into three groups (n=10 each) according to the sintering protocols(temperature & speed); Group (I): samples sintered by long sintering cycle (1510°C , 120 min holding time and 8 hours total cycle time), Group (II): speed sintering ( 1540°C , 25 min holding time and 2 hours total cycle time) and Group (III): high-speed sintering (1580°C, 10 min holding time representing the total firing cycle).Translucency parameter (TP) and Contrast Ratio (CR) were measured using a spectrophotometer, then compressive load was applied till fracture in a universal testing machine. One representative disc sample (10mm diameter x 1 mm thickness) was fabricated and sintered according to the parameters of each group and analyzed by scanning electron microscope. Collected data were statistically analyzed. Results: Sintering speed had a statistically significant effect on (TP),(CR) and fracture resistance means. Long cycle showed the statistically significantly highest (TP) and lowest (CR) mean values. The high-speed cycle recorded the statistically significantly highest fracture resistance mean values. Conclusion: Shortening the sintering cycle significantly decreased translucency and increased fracture resistance of monolithic zirconia crowns. Regarding Translucency Perception Threshold ,speed cycle can be recommended for sintering of BruxZir monolithic zirconia crowns.
https://edj.journals.ekb.eg/article_120862_7f52473345f867aeb5a21bdbdd5bc16a.pdf
2020-10-01
2649
2660
10.21608/edj.2020.42653.1257
Monolithic Zirconia
translucent zirconia
translucency
Fracture resistance
Sintering protocols
Rasha
Asaad
rashafmh@yahoo.com
1
Oral and Maxillofacial Prosthodontic Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia.
LEAD_AUTHOR
Mostafa
Aboushahba
mostafa.aboushahba@fue.edu.eg
2
Lecturer Fixed Prosthodontics Faculty of Oral and Dental Medicine Future University in Egypt, Cairo, Egypt
AUTHOR
ORIGINAL_ARTICLE
Effect of Thermodynamic Aging on Colour Stability, Roughness and Flexural Strength of Two CAD/CAM Lithium Disilicate Glass Ceramics
Objective: This study aimed to assess and compare the effect of thermodynamic aging on colour stability, roughness, and flexural strength of two CAD/CAM Li2Si2O5 ceramics. Materials and Methods: A total of 40 rectangular bar samples were fabricated representing two groups according to type of ceramic (20 samples each). Group I:IPS e.max CAD and Group II:Rosetta SM. Samples of each group were randomly distributed among two subgroups (10 samples each) according to testing procedure and thermodynamic aging condition: Subgroups IA and IIA (10 samples each) act as a control for flexural strength testing in non-aged condition. For Subgroups IB and IIB (10 samples each) both colour and surface roughness (Ra) were measured before thermodynamic aging. Then the samples were subjected again to colour, surface roughness and finally flexural strength (MPa) tests after thermodynamic aging. Data were statistically analyzed. Results: Neither colour nor flexural strength of the examined ceramic materials were significantly affected by thermodynamic aging. Regarding surface roughness, Rosetta SM was significantly affected by aging, while IPS e.max CAD did not. Conclusion: Concerning the measured parameters Rosetta SM is comparable to IPS e.max CAD being as clinically acceptable even after aging.
https://edj.journals.ekb.eg/article_120863_17eb70094c47a83e0ab33da2ae72a36b.pdf
2020-10-01
2661
2671
10.21608/edj.2020.42658.1258
Rosetta SM
Color
roughness
flexural strength
Thermodynamic aging
Shereen
Salem
sheri9704@yahoo.com
1
Fixed Prosthodontics October 6 University, Giza, Egypt
LEAD_AUTHOR
Rasha
Asaad
rashafmh@yahoo.com
2
Oral and Maxillofacial Prosthodontic Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia.
AUTHOR
ORIGINAL_ARTICLE
Mechanical Properties and Fluoride Release of Glass Ionomer Cement with Enhanced Antimicrobial Activity Derived from Addition of Schiff Base of Tetronic 1107
Abstract: Objectives: To synthesize and characterize Schiff base of Tetronic 1107 (T1107SB) to be added to GIC powder to enhance its antimicrobial activities and to evaluate the compressive strength (CS), elastic modulus (E), Vickers microhardness (HV) and fluoride release (FR) of the synthesized GIC. Materials and methods: T1107SB was synthesized by chloroacetylation of T1107, amination of chloroacetylated T1107 and modification of aminated T1107 with vanillin. Characterization of T1107SB was carried out by Fourier transform infra-red spectroscopy (FTIR), Elemental micro-analysis and Thermal gravimetric analysis (TGA). Antimicrobial activity of T1107SB-modified GIC (T-GIC) was studied by the "cut plug method" and minimal inhibitory concentration (MIC) test. CS and E were investigated in a universal testing machine according to the ISO 9917:2007. HV was evaluated by a Digital Microhardness Tester. Fluoride levels in ppm were obtained using the ion-selective electrode method. A one-way ANOVA and Bonferroni test were used to analyze the data (p ≤ 0.05). Results: Synthesis of T1107SB was confirmed by FTIR, elemental micro-analysis and TGA. T-GICs exhibited an enhanced antibacterial activity against Staphylococcus aureus and Bacillus cereus as confirmed by the growth inhibition zones. T-GICs showed no improvement in the antimicrobial activity against Candida albicans, compared to C-GIC. Significant differences were found between studied groups in CS, E, HV and FR. Increasing the percent of T1107SB resulted in a systematic reduction these properties. Conclusions: Addition of T1107SB is promising in enhancing the antibacterial activity of GIC materials without deteriorating their mechanical and fluoride-releasing properties.
https://edj.journals.ekb.eg/article_120864_7bec744bc20d37e7cca2231ffbac0928.pdf
2020-10-01
2673
2687
10.21608/edj.2020.32986.1146
antimicrobial activity
Tetronic 1107 Schiff Base
Mechanical Properties
Fluoride release
Samy
El-Safty
drelsafti@yahoo.com
1
Biomaterials Department, Faculty of Dentistry, Tanta University
LEAD_AUTHOR
El-Refaie
Kenawy
ekenawy@yahoo.com
2
Chemistry Department, Faculty of Science, Tanta University
AUTHOR
Mohamed
Azaam
mmkazaam@yahoo.com
3
Department of Chemistry, Faculty of Science, Tanta University
AUTHOR
Yehia
Mahmoud
yehiamah@gmail.com
4
Department of Microbiology (Mycology), Faculty of Science, Tanta University
AUTHOR
Samar
Khattab
samarabdelhady199@yahoo.co
5
Department of Chemistry, Faculty of Science, Tanta University
AUTHOR