Aim: The aim of this study is to compare wear of the natural teeth against polished yttrium tetragonal zirconia and polished lithium disilicate crowns. Study Setting and Design: Experimental type of study. Materials and Methods: Polished yttrium tetragonal zirconia and polished lithium disilicate crowns were fabricated and given to 15 patients each (n=15). Crowns were fabricated opposing natural tooth. Patients were recalled after 1year and impression were recorded with opposing arch and baseline and final cast were scanned and superimposed using 3 D scanner. Statistical Analysis Used: Data collected by experiments were computerized and analyzed using the Statistical Package for Social Sciences (SPSS) version 16.0. The normality of the data was checked using the Kolmogorov-Smirnov test and Shapiro-Wilk tests. The data were normally distributed. Statistical analysis was done by using tools of descriptive statistics such as Mean, and Standard Deviation for representing quantitative data (enamel wear measured in μm) Parametric tests: Student t-test for intergroup comparison was done. Results: No statistical difference were found between wear of opposing enamel for polished yttrium tetragonal and polished lithium disiliacte crowns [p=0.446]. Conclusion: Within the limitations of the study, it can be concluded that polished lithium disilicate showed better clinical outcome than polished yttrium tetragonal zirconia, though the evaluated data was statistically non significant.
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