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Surface roughness of two different monolithic materials after chewing simulation

Aims and Objectives: The aim of this study was to evaluate two-body wear and surface roughness of two different monolithic ceramics: polymer-infiltrated ceramic (PICN) and lithium disilicate. Materials and Methods: Chewing simulator was used to investigate two-body wear (75,000 cycles, 49N, and 60 cycle/min). The tested samples were divided into two groups according to their materials; each group comprised 14 ceramic discs. Subtractive weight loss was used to statistically analyze the wear of all samples before and after chewing simulation test. Surface roughness was measured before and after chewing simulation test using three-dimensional optical profilometry. Data were collected and analyzed using analysis of variance test, and then verified by unpaired t-test. Results: Statistically significant differences were found for two-body wear, with higher mean weight loss in PICN than lithium disilicate after chewing simulation. PICN had higher mean surface roughness value than lithium disilicate after chewing simulation. Conclusion: PICN showed higher wear regarding weight loss and surface roughness changes than lithium disilicate.