Effect of pre-treatment with chlorhexidine on the retention of restorations: a randomized controlled trial.

Gisele Rodrigues Da Silva,Isabela Sousa Araújo,Bruno De Castro Ferreira Barreto,Carlos José Soares,Célio Jesus Do Prado,Luís Roberto Marcondes Martins,Rodrigo Dantas Pereira

doi:10.1590/0103-6440201300009

Gisele Rodrigues Da Silva, Isabela Sousa Araújo + Show 5 more

Open Access

https://doi.org/10.1590/0103-6440201300009

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Abstract

This study aimed to evaluate the effect of chlorhexidine (CHX) application on etched dentin on the 6-month retention of restorations placed on non-carious cervical lesions (NCCLs). A randomized controlled split-mouth and triple blind trial was carried out. Patients (n=42) with at least two non-carious cervical lesions were included. NCCLs were randomly assigned to two groups: control (placebo solution) or test group (2% CHX solution for 60 s after acid etching and before the adhesive application). Class V restorations (n=169) were performed with an etch-and-rinse adhesive system and composite resin by 10 trained operators. A calibrated examiner evaluated the restorations at 1 week (baseline) and at 6 months using the FDI criteria. The primary outcome was retention of the restorations. The analysis of factors associated to failure of restorations was carried out by Fisher's exact test (α=0.05). After 6 months of follow-up, 3.4% (CI 95% 1.3-7.3) of the restorations failed. There was no statistically significant difference between control and CHX (p=0.920). Regarding the cavity variables, deeper (p=0.04), wider (p=0.004) and wedge-shaped (p=0.033) cavities failed more. Both treatments provided acceptable clinical performance of the restorations. The use of CHX as a adjuvant in dentin adhesion did not influence the retention of Class V restorations after 6 months of follow-up.

Highlights

Resin composites have been widely used in direct adhesive restorations (1,2) due to their excellent physical and mechanical properties (3)
The aim of this study was to test the effect of the composite resin composition and aging time on the μTBS to different dental substrates
Two 2-mm-thick increments were used on enamel and dentin to build composite resin restorations measuring 4x4x4 mm (4)

Summary

Introduction

Resin composites have been widely used in direct adhesive restorations (1,2) due to their excellent physical and mechanical properties (3). These composites have inherent shortcomings that are mainly relative to polymerization shrinkage (4). Silorane technology has afforded a highly hydrophobic restorative material with lower polymerization shrinkage that results in lower residual shrinkage stress (2,4,5). This composite resin presents better color stability as well as lower insolubility in biologic fluids and adequate physical and mechanical properties, making it clinically suitable (7,8). Some studies have shown that this low shrinkage of composites provide clinical longevity (9,10)

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