Shear bond strength of posterior comp-osite cores

Jabbar Kamel,Ahmed Kharoufa,Abdul–Adheem Al–Mallah

doi:10.33899/rden.2005.45516

Abstract

This study was designed to evaluate the shear bond strength (SBS) of posterior composite resin cores to tooth surface using two dental adhesives and two retentive means. Thirty extracted permanent molars were used for this purpose. They were made flat by removing the occlusal one third using “stone grinding wheal”. Teeth were then randomly divided into six groups: Groups I and IV: Scotchbond Multipurpose Plus (SbMP) and All bond 2 dental adhesives were used for groups I and IV respectively to adhere composite to the flat tooth surface with no retentive mean as the control group. Groups II and V: A circumferential slot was prepared and composite attached to the tooth using SbMP and All bond 2 for groups II and V respectively. Groups III and VI: Four self threading pins were placed and composite adhered using SbMP and All bond 2 for groups III and VI respectively. After storage and thermal cycling, the SBS for each group was measured using “universal testing machine”. The results varied according to the retentive mean and dental adhesive used. Groups with four pins produced the highest SBS and groups with no retentive mean showed the lowest SBS. Also the groups using All bond 2 adhesive generally had higher values when compared with the same groups using SbMP dental adhesive. Within the limits of this study, it is indicated that when the highest SBS is to be achieved, then All bond 2 dental adhesive with pins should be used.

Highlights

More than 40 years ago, Bowen[1] introduced a new restorative material called composite resin to the dental profession
The first composite resin chemically adhesive to both enamel and dentin was developed in 1977.(4) Dentin bonding agent is used routinely to provide retention for composite restoration.[5]. Dentin bonding systems should provide a strong early bond between resin and dentin to resist the polymerization shrinkage of the resin composite and prevent microleakage around the restoration.[6]. Dental resin composites, advocated for use in the posterior teeth, were introduced in the early 1980s, and have become increasingly popular in restorative dentistry.[7]. The first major improvement in posterior composite resins came about with the introduction of a restorative material called p–10 (3M Co, USA)
The results showed that group VI possess the highest mean (33.32 MPa), and group I possess the lowest mean (21.48 MPa)

Summary

Introduction

More than 40 years ago, Bowen[1] introduced a new restorative material called composite resin to the dental profession. The ra-pid acceptance of composite resin by organi-zed dentistry was based on several important considerations These included its excellent colour matching ability; substantially impro-ved physical properties; and the relative ease of handling. The first composite resin chemically adhesive to both enamel and dentin was developed in 1977.(4) Dentin bonding agent is used routinely to provide retention for composite restoration.[5] Dentin bonding systems should provide a strong early bond between resin and dentin to resist the polymerization shrinkage of the resin composite and prevent microleakage around the restoration.[6] Dental resin composites, advocated for use in the posterior teeth, were introduced in the early 1980s, and have become increasingly popular in restorative dentistry.[7] The first major improvement in posterior composite resins came about with the introduction of a restorative material called p–10 (3M Co, USA). This material was a simple modification of a restorative material called Concise, which was marketed by the same company (3M Co, USA) for anterior teeth.[8]

Objectives

Methods

Results

Conclusion