Title: Randomized 36-month Follow-up of Posterior Bulk-filled Resin Composite Restorations
Alessandro Loguercio (Presenter)
Universityersidade Estadual de Ponta Grossa
Márcia Rezende, State University of Ponta Grossa
Mario Gutierrez Reyes, University of Chile
Thays Costa, State University of Ponta Grossa
Alessandra Reis, State University of Ponta Grossa
Objectives: Objective: The aim of this double blind, randomized clinical trial was to evaluate the 36-month clinical performance of the placement technique (incremental and bulk fill) in posterior composite resin restorations bonded with two different adhesive strategies (self-etch and etch-and-rinse).
Methods: Methods: The protocol followed the CONSORT statement for clinical trials. After sample size calculation, posterior dental cavities of 72 participants (n= 236), with a cavity depth of at least 3 mm, were randomly divided into four groups. The restorations were bonded using either the etch-and-rinse Tetric N-Bond (Ivoclar Vivadent; ER) or the self-etch Tetric N-Bond SE (Ivoclar Vivadent; SE). The composite resin Tetric N-Ceram Bulk Fill (Ivoclar Vivadent) was placed either incrementally (IF) or using the bulk-fill (BF) technique. Two experienced and calibrated examiners evaluated the restorations using World Dental Federation criteria after one week (baseline) and after 36 months. The statistical analyses were performed with Friedman repeated measures ANOVA by rank and McNemar test for significance in each pair (α=0.05).
Results: Result: After 36-month, fourteen restorations showed fractures classified as “B" or "C” and twenty-two restorations were classified as “B” for marginal adaptation. Thirty-one restorations were considered as “B” for color match in the baseline and thirty-eight restorations after 36-month. No significant difference was observed between materials for any of properties (p > 0.05). The unique difference statistically significant was observed for marginal discoloration. Thirty-three restorations (3 for ER-IF; 3 for ER-BF; 14 for SE-IF and 12 for SE-BF) showed marginal discoloration classified as “B” after 36-month (p < 0.05).
Conclusions: Conclusions: The bulk-fill technique showed excellent clinical performance, which was comparable during the 36-month of clinical evaluation with the 2mm incremental technique and it was not affected by the adhesive strategy. However, using the self-etch strategy may lead to some marginal discolorations than etch-and-rinse strategy independently to filling technique.