Abstract
The purpose of this study was to compare the effect of a self-etching primer and a non-rinse conditioner with the effect of a conventional adhesive system on the penetration depth in dentin of human teeth, using scanning electronic microscopy (SEM). Fifteen human third molar teeth were sectioned into 2 pieces. All pieces were flattened with grade 600 to 1200 silicon carbide paper and divided into 6 groups: group 1 - Prime & Bond NT (NT), negative control; group 2 - 37% phosphoric acid + Prime & Bond NT (PANT), positive control; group 3 - Non-rinse Conditioner (NRC) + Prime & Bond NT (NRCNT); group 4 - NRC + Prime & Bond 2.1 (NRCPB); group 5 - NRC + Scotchbond MP (NRCSB); group 6 - Prompt L-Pop (PLP). All teeth were covered with Dyract AP. The tooth fragments were decalcified, and its resin replicas were evaluated by SEM by three previously standardized examiners. The penetration was scored from 0 (no penetration) to 3 (maximum penetration). The Kruskal-Wallis and Mann-Whitney U tests (p<0.05) showed three statistically homogeneous groups: (NT, NRCPB, NRCSB and PLP), (NRCNT) and [PANT]. The authors concluded that the self-etching primer and the non-rinse conditioner provide a lower penetration depth in human tooth dentin than the conventional adhesive system.
Highlights
The acid etching technique, presented by Buonocore [1] in 1955, generated a revolution in Dentistry, stimulating the development of several new products
As several factors must be analyzed, scanning electron microscopy (SEM) has been used to evaluate the micromechanical bonding mechanism offered by the current adhesives
This research is done through observation of dentinal tissue samples or replicas in resin [2], which clearly reveals that bonding has a biomechanical nature, based on hybridization of the demineralized dentinal tissues, with resin tag and lateral branch formation [3,4,5]
Summary
The acid etching technique, presented by Buonocore [1] in 1955, generated a revolution in Dentistry, stimulating the development of several new products. Acid primers, single-bottle agents and self-etching bonding systems have become known in a very short period of time. These products must be evaluated and tested before they are used on a large-scale basis. Some of the adhesive systems have an etching and primer combination that is applied in only one step (acid primers), in order to render their clinical use more practical and fast. Others include a primer and adhesive in only one bottle (single-bottle agents); these are used after enamel and dentin etching procedures with phosphoric acid have been performed [6,7]. Possibilities of error are minimized during their use, the total application procedure is not simple because several layers must be applied, time saving procedures regarding conventional systems are not that significant [8,9]
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