To evaluate the influence of pretreatments on microtensile bond strength (μTBS) to eroded dentin when using a universal adhesive in self-etch mode. Forty-eight human molars were randomly assigned six groups (G1–G6, n = 8) and ground down until exposure. G2–G6 with citric acid (pH 2.6) for 10 × 2 min (within 12 h) 5 consecutive days. G1 G2 served as uneroded controls not pretreated. G3 G4 pretre...

introduction: the aim of this study was to evaluate the effect of various concentrations of naocl on shear bond strength of composite resin to dentin of primary teeth, prepared with laser and bur. methods: in this in vitro study, 48 primary molars were sectioned at mesiodistal direction and were randomly divided into 6 groups; g1: bur, g2: bur + naocl 2.5%, g3: bur + naocl 5.25%, g4: laser, g5:...

STATEMENT OF PROBLEM Laser irradiation makes structural and chemical changes on the dental hard tissues. These changes alter the level of solubility and permeability of dentin. PURPOSE The aim of this study was to compare the microhardness and the structural changes in the dentin cavity floor prepared with Er: YAG laser and bur. MATERIAL AND METHODS In this experimental study, fifteen intac...

INTRODUCTION Thermal changes can occur on the external root surface when root-end cavity preparation is performed, which may damage periodontal ligament cells and alveolar bone. OBJECTIVE The purpose of this study was to evaluate the temperature changes during preparation of the root-end cavities at 1 and 3 mm to the sectioned apical root surfaces when either tungsten carbide round bur, diamo...

Introduction: Surface roughness can increase the retention of castings by ridges and grooves that are microretentive. This study compared the retention of implant-supported crowns when used with 3 different surface roughness abutments and one temporary cement. Methods: Thirty solid abutments (ITI), 4 mm high, were divided into three groups randomly. In the first group, 10 abutments were roughen...

BACKGROUND Erbium, chromium: Yttrium, scandium, gallium, garnet (Er, Cr: YSGG) laser has been successfully used in the ablation of dental hard and soft tissues. It has been reported that this system is also useful for preparing tooth surfaces and etching, but no consensus exist in the literature regarding the advantage of lasers over conventional tooth preparation technique. MATERIALS AND MET...

OBJECTIVES To evaluate the effect of cutting teeth with different types of burs at various speeds on surface topography of tooth surface and interfacial gap formation at resin-tooth interface. MATERIAL AND METHODS The human molars were divided into seven groups: Diamond bur in airrotor (DA) & micromotor (DM), crosscut carbide bur in airrotor (CCA) & micromotor (CCM), plain carbide bur in airr...

OBJECTIVES Bond strength of composite resin to enamel and dentin of primary teeth is lower than that to permanent teeth; therefore, it may compromise the adhesive bonding. New methods, such as laser application have been recently introduced for tooth preparation. The purpose of this study was to evaluate the effect of tooth preparation with bur and Er:YAG laser on shear bond strength of composi...