383 - Effect of Polishing and Bleaching on Resin-Composites Roughness after Staining

Purpose: To evaluate the effects of OneGloss and PoGo on surface roughness (Ra) of two nanocomposites {Clearfil Majesty Esthetic (CME) and Filtek Z350 XT (FZ)} before and after exposure to a staining and after bleaching {Ultradent Opalescence Boost PF 40% (UOP)}.

Methods: Specimens were prepared from each resin composite against Mylar strip (Mylar) and finished (Finish), and then Ra was tested after each step. Specimens were polished (Polish 1) with OneGloss or PoGo and stained (Stained) in coffee, and then Ra was tested after each step. Specimens were polished (Polish 2) with OneGloss or PoGo and bleached (Bleach) with UOP, and then Ra was tested after each step.

Results: The Ra of CME and FZ after Polish 1 were 0.08±0.01 and 0.05±0.01 and 0.05±0.01 and 0.03±0.01 respectively. A statistically significant difference was evident between the two resins with FZ having a lower Ra value (P < .05). After Staining, both resins that had been polished by PoGo (0.05±0.01, 0.03±0.01) showed a significant difference in Ra with FZ having a lower value (P < .05). When CME and FZ were compared after Polish 2, a statistically significant difference between resins was evident for OneGloss and PoGo (P < .05). Ra after Bleach showed a significant difference only for the PoGo

Conclusions: PoGo exhibited the smoothest finish for both resins and PoGo polishing was less susceptible to staining. The effectiveness of the finishing/polishing systems was material dependent. Repolishing and bleaching influence CME that had been polished and re-polished with OneGloss or polished by OneGloss and then bleached.