Abstract
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 airrotor (CA) & micromotor (CM) and #600-grit silicon carbide paper (SiC). In five samples from each group Class II box-only cavities were restored. The occlusal surface of four teeth per group was flattened. Two out of four teeth were acid etched. Teeth were subjected for scanning electron microscopy (SEM). Results: Interfacial gap was observed in all groups with no significant difference. SEM observations revealed CA, CCA & DA were coarser than CM, CCM, DM and SiC. SEM of etched tooth surfaces revealed complete removal of amorphous smear layer in CA & CM, partial removal in CCA, CCM, DA & DM and no removal in SiC. Conclusions: Selecting an appropriate bur and its speed may not play an important role in bonding in terms of interfacial gap formation. Variable changes were observed in surface topography with different burs before and after acid etching. Key words:Surface topography, resin-tooth interface, interfacial gap, bonding.
Highlights
Dentin bonding is a complex phenomenon [1,2]
These results shows that there was no significant difference in all the groups, whether we used Fine grit straight fissure diamond bur, Crosscut or Plain fissure carbide bur and #600-grit silicon carbide abrasive paper in air rotor or micro motor on axial or gingival tooth surface
scanning electron microscopy (SEM) of dentin surfaces etched with 38% phosphoric acid revealed complete removal of amorphous smear layer in plain carbide air rotor (CA) (Fig. 3C) followed by plain carbide micro motor (CM) (Fig. 3D)
Summary
Dentin bonding is a complex phenomenon [1,2]. High organic content, tubular structure with the presence of odontoblastic processes, continuous moist conditions due to the presence of dentinal fluid, intratubular pressure, permeability and the formation of the smear layer during cavity preparation makes dentin a sensitive substrate for bonding. Most of the in vitro studies were conducted using flat surface of dentin prepared with SiC abrasive paper for dentin bonding clinical conditions are entirely different. Due to the different configuration of flat surfaces in vitro studies and complex cavities prepared in clinical situation, the bonding results may not be same in both situations. Several in vitro studies have investigated the effect of dentin surface preparation with different instruments on bond strength and micromorphology at resin-dentin interface. The present study evaluated the surface topography of cut and acid etched dentin substrate after preparation by different rotary cutting instruments at different speeds and to determine the in vivo efficacy of different burs at different speeds in achieving a gap free internal adaptation between resin restorative material and dentin
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