Assessment Of Tensile Bond Strength Of Ceramic Restoration Material Comparing Two Immediate Dentin Sealing Protocols

Abstract

ABSTRACT Aim: The aim of this study was to evaluate the effect of two immediate dentin sealing protocols including sealed dentin surface refreshment with air abrasion versus sealed dentin surface refreshment with pumice on tensile bond strength of ceramic restoration material. Materials and methods: Twenty extracted human molars were used. The prepared teeth were randomly divided into two groups according to the surface refreshment method into group (C): Air abrasion using Cojet and group (P) using pumice slurry. Twenty ceramic discs were sliced into standard thickness of 2mm ceramic slices. The teeth were immediately sealed using single bond universal adhesive it was then covered using a layer of provisional filling material directly after cutting. The provisional filling was then removed and dentin was cleaned using either airborne-particle abrasion (CoJet, 3M ESPE) (Group (C) or Pumice (group (P). The specimens in each group were then thermo-cycled and tensile bond strength test was done, using Universal Testing Machine. One-way ANOVA was used to study the effect of different tested variables and their interaction. Results: Samples done using air abrasion with Cojet, showed higher tensile bond strength than those using pumice. Conclusions: Immediate dentin sealing treatment would be recommended within high tensile stresses, when surface refreshment done by air abrasion to the tooth structure.