Two-Body Wear And Surface Roughness of Three Different Ceramic Systems And Their Enamel Antagonist: An In Vitro Study

Abstract

Statement of the problem: Ceramics and glass-ceramics are materials of choice for dental crowns due to their attractive hardness, biocompatibility, etc. However, a major problem with their usage is the observed high wear of either the opposing dental enamel or both the enamel and ceramic itself. Objective: The present study aimed at ranking and comparing the wear performance of three different ceramic systems as an indication of wear. In addition, change in surface roughness was calculated using optical surface profiler. Results: The statistically significant highest mean material's weight loss was recorded in porcelain group, whereas the statistically significant lowest mean weight loss was recorded in BruxZir group. The statistically significant greatest mean antagonist weight loss was recorded for e.max antagonist cusp, whereas the statistically significant lowest mean weight loss was recorded for BruxZir antagonist cusp.Surface roughness increased after wear procedure in all samples. Conclusions: Within the limitations of this in vitro study, monolithic zirconia and porcelain resulted in less wear depth to human enamel compared to lithium disilicate based ceramics (e.max CAD). However, porcelain is more affected by wear compared to zirconia.

Comparative evaluation of wear resistance between lithium disilicates and polymer infiltrated ceramics manufactured by computer aided design (CAD) computer aided manufacturing (CAM) against natural tooth enamel

“…The teeth which were caries free, non attrited and were in healthy state were selected for present study preventing variability among teeth specimens which is in accordance with studies done by Hassan S,Gad N (2017). 31 Teeth were then mounted in autopolymerising acrylic resin of dimensions 15mm length x 10mm width x10mm thickness in accordance with Rupawala A et al (2017). 32 These teeth specimens served as pin in pin on disc wear testing apparatus.…”

Two-Body Wear and Surface Roughness of CAD/CAM Esthetic Monolithic Block Materials using Chewing Simulation against Enamel Antagonists

“…51 This contradicts our findings as Suprinity had Ra mean value of 0.25 µm but its antagonist showed high wear compared to the antagonists of the other tested materials which may be attributed to the higher hardness of Suprinity. 52 In addition, the existence of zirconia as a reinforcing agent in the glassy phase (8-12%), supposedly strengthened the material through a crack interruption mechanism under cyclic loading using a chewing simulator. Zirconia transformed from the metastable tetragonal phase to a stable monoclinic phase with an increase in grain volume, which hindered crack development and propagation thus impeding fragmentation and consequent roughness.…”