IN VITRO COMPARATIVE EVALUATION OF SURFACE ROUGHNESS OF THREE DIFFERENT COMPOSITE RESINS AFTER FINISHING AND POLISHING PROCEDURE - AN ATOMIC FORCE MICROSCOPIC ANALYSIS.

Background/Purpose: The nishing and polishing procedures may affect the surface roughness of composite resins. This study is aimed to evaluate the surface roughness of Nano-hybrid, Micro-hybrid, and Bulk-l composite resins after the nishing-polishing procedure. Materials and Methods: Thirty cylindrical disks of dimension (8mm diameter x 2mm thickness) were prepared. These disks were randomly distributed into 3 different groups (n = 10) based on different composite resins are Nano-hybrid (Filtek Z250 XT), Micro-hybrid (Filtek P-60) and Bulk-l (Filtek Bulk-Fill) composite resins used. Super snap kit (Sofu, Japan) was used as a nishing/polishing system. Statistical analysis of the data was performed by using one-factor analysis of variance (ANOVA) and Tukey's HSD (honestly signicant difference) post hoc test (α=2) P < 0.05. Results: All the tested samples showed surface roughness. Nano-hybrid exhibited the least surface roughness (0.0361 μm,) followed by microhybrid (0.0815 μm) and bulk-ll (0.1339μm), which exhibited the highest surface roughness. (P< 0.001) Filtek Z250 XT exhibited Conclusion: better smooth surface as compared to all groups.