Abstract
Due to doubts related to the application and association of techniques for appropriate adhesion, as the air abrasion system and last generation adhesive systems, the objective of this study was to evaluate the marginal leakage in Class V composite restorations in permanent teeth prepared with rotating instruments and then submitted to air abrasion and adhesive systems. Cavities were prepared with burs in high speed in facial and lingual surfaces of 25 human third molars. The specimens were divided into 5 groups of 10 preparations each: G1 (air abrasion and Scotchbond Multi Purpose), G2 (phosphoric acid and Scotchbond MP), G3 (Clearfil SE Bond self-etching system), G4 (air abrasion, phosphoric acid and Scotchbond MP) G5 (air abrasion and Clearfil SE Bond). All groups were restored with Z100 composite resin. The teeth were subjected to thermal cycling and immerged in 50% silver nitrate solution. After sectioning, the specimens were analyzed with a stereomicroscope for assessment of microleakage according to the degree of dye penetration. The Kruskal-Wallis test followed by Dunn Multiple Comparison test were performed in order to evaluate the differences among the experimental groups. Air abrasion groups demonstrated the greatest leakage. Scotchbond MP with phosphoric acid produced the least leakage, with greater leakage in gingival margins than occlusal margins in all experimental groups. It was concluded that dentin treatment with air abrasion should not be used in permanent teeth to reduce the marginal leakage.
Highlights
The air abrasion system uses a high-speed stream of purified aluminum oxide particles propelled by air pressure
Li et al.[16] reported that Clearfil SE Bond, a selfetching adhesive system, simultaneously etches and primes the dentin, allowing the adhesive resin to fully penetrate the demineralized dentin surface, and this reduces the possibility of susceptible porosity to hydrolytic damage
When cervical and occlusal margins of each group were compared, it was verified that leakage values were greater in cervical margin for all groups, without statistically significant difference only in the groups 1 and 2 (Table 4)
Summary
The air abrasion system uses a high-speed stream of purified aluminum oxide particles propelled by air pressure. In 1945, Black[2] reported on the airbrasive technique for nonmechanical cavity preparation in response to the need to increase patient confort by reducing pressure, heat, vibration, and noise during the mechanical preparation of teeth with rotating bur. 7,10,26 Even so, other studies demonstrated that air abrasion system does not substitute acid etching and the association of these methods is necessary to obtain adequate adhesion to the substrate. The conventional adhesive systems, which use the total-etch technique, generally indicate the phosphoric acid fosfórico as acid conditioning agent. The objective of this study was to evaluate the marginal leakage in gingival and occlusal margins of Class V composite restorations in permanent teeth prepared with rotating instruments and submitted to air abrasion and adhesive systems Li et al.[16] reported that Clearfil SE Bond, a selfetching adhesive system, simultaneously etches and primes the dentin, allowing the adhesive resin to fully penetrate the demineralized dentin surface, and this reduces the possibility of susceptible porosity to hydrolytic damage.
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