The Influence of Desensitizing Agent on Shear Bond Strength of Dentin Using Two Dentin Adhesive Systems

Abstract

This is in vitro study evaluate the effect of desensitizing agent on shear bond strength of two different adhesive systems scotch bond (water/ethanol/base adhesive system) and prim and bond NT (acetone base adhesive system). fouty-two human upper & lower premolar teeth recently extracted for orthodontic purpose were selected. These teeth polished and cleaned before embedded in acrylic block. 2mm from the buccal surface of the blocked tooth were ground to obtain flat surface with 600 grit silicon carbide paper. Each tested groups has been treated with desensitizing agent for 2 minutes and leave it without washing for 10 minutes. The tested and control groups were etched using 37% of the phosphoric acid, and the bonding system was applied according to manufacture instruction. The specimens were divided in two main groups. Each one subdivided in two subgroups: Group A: Treated with scotch bond 1 with 3m feltick Z 250 composite resin.Subgroup A1¬: (control group).Subgroup A¬2: (tested group, dentin surface pretreated with desensitizing agent before etching).Group B: treated with prim& bond NT adhesive system with feltick Z 250.Subgroup B1: (control group).Subgroup B2: (tested group, dentin surface pretreated with desensitizing agent before etching). Shear bond strength was determined using instron testing machine and result showed that.•There is a significant decrease in shear bond strength for scotch bond -1 adhesive system and 3m feltick Z 250, after with desensitizing agent (soothe) for 2minutes.•There is no significant difference in the shear bond strength after treatment the prepared surface of dentin with desensitizing agent (soothe) for 2minutes.•The effect of desensitizing agent is depend on the type of bonding system were used.Aims of the study The aim of this study in vitro study is to evaluate the effect of desensitizing agent on shear bond strength of:1.scotch bond 1 adhesive system with 3m feltick Z 250 composite resin.2.prim & bond NT adhesive system with 3m feltick Z 250 composite resin.