Effect of Mechanical and Chemical Root Surface Treatment on the Shear Bond Strength of Intracanal Post in Primary Anterior Teeth: An In vitro Study

Abstract

Introduction: Aesthetic restoration of severely mutilated primary anterior teeth still remains as a special challenge to paediatric dentist. Due to increased parent's concern for aesthetic rehabilitation for their children, paediatric dentist are in a state to improve technique sensitive restorative procedure to improve aesthetic rehabilitation in children. Aim:The purpose of the study was to evaluate the effect of different root surface treatment on the shear bond strength of glass fibre reinforced post in primary anterior teeth using Universal Testing Machine (UTM). Materials and Methods:Twenty single rooted primary anterior teeth were selected. Coronal portions of the teeth were sectioned transversally 2 mm above the Cemento-Enamel Junction (CEJ) and specimens were treated endodontically and obturated using metapex. Then the specimens were randomly divided into four groups. Group 1: Control group; Group 2: Chemical surface treatment of the root with 2% chlorhexidine; Group 3: Mechanical surface treatment with mushroom-shaped undercut; Group 4: Combination of mechanical and chemical surface treatments. Samples were tested for shear bond strength. ANOVA and Posthoc Tukey test were used for statistical analysis using SPSS version 20.0. Results:Combination of mechanical and chemical surface treatments exhibited higher mean shear bond strength (8.41 MPa), followed by mechanical surface treatment (4.68 MPa), chemical surface treatment (3.92 MPa) and control group (2.76 MPa). Conclusion:Mechanical and chemical surface treatments together led to a improved shear bond strength and increased the retention of the post to the root surface.

Effect of Root Canal Filling Materials and Pretreatment with Solvents on the Shear Bond Strength of Composite Resin with Primary Tooth Dentin

“…The purpose of this study was to evaluate the effect of root canal filling materials and their solvents on shear bond strength of composite with the dentin in the anterior primary teeth. Most of the composite resin restoration failures in anterior teeth are due to high shear forces [ 19 ]. Hence, we evaluated the effect of different root canal filling materials and their solvents on shear bond strength of composite to anterior primary teeth.…”

“…Second, after the process of hardening, water exposure can result in eugenol release [ 9 ]. Because of the existence of the hydroxyl group in the chemical structure of eugenol, polymerization of composite resin materials would be hindered [ 19 ]. Reduced bond strength values observed in this research can be the consequence of the aforementioned reasons, as it is confirmed in SEM images.…”

“…A clean dentinal surface is necessary for proper bonding [ 21 ]. Most studies about surface treatment techniques to improve the adhesion are limited to permanent teeth [ 19 ]. But, in the present study, the effect of different solvents on the shear bond strength of composite with dentin in primary teeth was evaluated.…”

Factors influencing the dentinbond strength -a review

“…[2], [4], [6] Even though these systems use fewer separate components, their application still requires that the steps be performed with great attention. A wide range of dentin shear bond strength (SBS) has been reported for these materials that may indicate technical concerns, which are not well identified.…”

“…Much of difficulty in bonding to dentin is due to its tubular and heterogenous nature, high fluid content, presence of smear layer, and the need to achieve the pupal biocompatibility. [4], [5], [6] In the beginning, separate chemical components and several application steps were needed for priming and bonding. [7] Current advances have focused on the development of delivery systems that simplify the steps involved.…”