EFFECT OF HUMAN ENAMEL ON WEAR OF THREE TYPES OF INTERIM RESTORATIVE MATERIALS (AN IN-VITRO STUDY)

Document Type : Original Article

Authors

1 Assistant Professor, Crowns and Bridges Department, Faculty of Dental Medicine, Al Azhar University, Egypt

2 Assistant Professor, Dental Biomaterials Department, Faculty of Dental medicine, Al-Azhar University, Egypt

3 Lecturer, Crowns and Bridges Department, Faculty of Dental Medicine for Girls, Al Azhar University, Egypt

Abstract

Objectives: The purpose of the present study was to determine wear behavior of two different composite resin; UDMA / Urethane Dimethacrylate and bis-GMA based, compared with a PMMA conventional resin interim restorative materials.
Materials and Methods: Thirty samples (10 of each material; Revotek LC, TempSpan, Jet tooth shade) were prepared in the form of discs (10 mm diameter and 2 mm thickness), then all samples were subjected to Two-body wear simulation test using a programmable logic controlled equipment. Human enamel was used in this study as specimen’s antagonist. Two wear measurement protocols; 1- roughness change measurement using the optical profilometry and, 2- weight loss measurement by electronic analytical balance were performed before and after loading
Results: Roughness change comparison between the experimental material groups showed that the highest roughness change was recorded for Revotek-LC group mean value (-0.000539 ±0.003 µm) followed by Jet tooth shade group mean value (-0.000478 ±0.001 µm) while the lowest roughness change was recorded for TempSpan group mean value (-0.0002 ±0.001 µm). The difference between groups was statistically non-significant. On the other hand, weight change results showed that the highest weight change was recorded for Jet tooth shade group mean value (-0.006717 ±0.0006 gr) followed by Revotek-LC group mean value (-0.00345 ±0.0021 gr) while the lowest weight change was recorded for TempSpan group mean value (-0.001167 ±0.0004 gr), and the difference between groups was statistically significant as indicated by ANOVA test followed by Tukey’s post-hoc test (p=<0.0001<0.05) as indicated by ANOVA test followed by Tukey’s post-hoc test (p=0.9823>0.05).
Conclusions: 1. There was no significant change in roughness of each tested interim restorative material before and after 3 months wear simulation cycles. 2. TempSpan and Revotek LC showed the highest wear resistance based on weight change measurements. 3. Jet tooth shade interim restorative material exhibit the lowest roughness change of enamel antagonist.

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