An evaluation of the effects of different finishing / polishing techniques on smoothness of composites


Rough, poorly polished resin – based composite surfaces contribute to staining, plaque accumulation, gingival irritation and recurrent caries. Proper finishing and polishing enhance both the esthetics and longevity of restored tooth. To evaluate the effect of different finishing / polishing techniques on the surface roughness of minifilled hybrid Filtek Z250 and very fine particles hybrid Latitude composite resins. Two types of composite resin were used, Filtek Z250 and Latitude. 32- disc shaped specimens for each type of composite were made (with diameter of 10 mm and 2mm thick) and total is 64 –specimens. All the specimens were cured under Mylar – matrix strip and divided into four groups: control had no surface treatment, finished with fine and extra fine diamond burs, finished with 12 – fluted and 30 – fluted carbide finishing burs, treated with diamond burs plus coarse, medium, fine and extra fine Sof – lex discs. Surface roughness of the specimens was evaluated using profilometer, and the data were analyzed by 2 – way ANOVA test and LSD test. There was statistically significant difference in the average surface roughness values among Mylar – strip, diamond bur, carbide bur, diamond bur plus Sof – Lex discs. For both materials, there was no significant difference between them. Surface roughness of composite resin is directly influenced by finishing / polishing technique used. For both types of composite resin tested in this study, there was no significant difference between them. The Mylar strip provided a smoother surface than the other groups. It was followed bydiamond bur plus Sof – Lex disc, carbide bur and, the diamond bur produced the highest surface roughness values.