Effect of surface finish on wear of ceramics
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OBJECTIVE: To investigate the effect of surface finish on wear of dental ceramics. MATERIALS AND METHODS: 192 ceramic specimens (2×12×14 mm) were prepared using Vita Enamic, Vita Mark II, IPS e.max, and InCoris Zirconia TZI (n=48 for each material). Each material was divided into four main groups (n=12) according to their surface treatment (polished, machined, polished, then glazed, and machined, then glazed). Ceramics were subjected to 200,000 cycles against Vita Mark II using the two-body pin-on-plate linear wear tester under dead weight a load of 1 Newton. The wear performance of ceramic was determined using volume loss and wear depth. The antagonist’s wear was determined using height loss. Surface roughness was evaluated, and SEM was used to assess the microstructural changes. RESULTS: ANOVA statistical analysis revealed a significant effect of wear on ceramics in terms of volume loss and wear depth (P<0.05). Vita Mark II, IPS e.max showed the most abrasive effect. InCoris Zirconia TZI showed excellent wear resistance, while Vita Mark II exhibited intermediate wear resistance. Glazed ceramics demonstrated more wear than non-glazed ceramics. Less wear was observed in polished ceramics compared to machined. Antagonist ceramics showed more abrasion on glass-matrix substrates than zirconia. Antagonist abrasion was less on Vita Enamic ceramics. A significant difference in surface roughness between materials before and after the wear test (P<0.05) was observed. Vita Enamic showed a rougher surface after wear test, while InCoris Zirconia TZI was smoother. CONCLUSION: Vita Mark II, IPS e.max CAD were very abrasive when opposed by Vita Mark-II than InCoris Zirconia TZI and Vita Enamic. The glaze layer showed increases wear. Therefore, polishing restorations is recommended for the best results of wear resistance.