Abstract
Since the use of air abrasion has grown in pediatric dentistry, the aim of this study was to evaluate, by means of shear bond strength testing, the need to use the total etching technique or self-etching primers on dentin of primary teeth after air abrasion. Twenty-five exfoliated primary molars had their occlusal dentin exposed by trimming and polishing. Specimens were treated by: Air abrasion + Scotchbond MultiPurpose adhesive (G1); 37% phosphoric acid + Scotchbond MP adhesive (G2); Clearfil SE (G3); Air abrasion + 37% phosphoric acid + Scotchbond MP adhesive (G4); Air abrasion + Clearfil SE (G5). On the treated surface, a cylinder of 2 mm by 6 mm was made using a composite resin (Z100). Duncan's test showed that: (G2 = G3 = G5) > (G1 = G4). The use of a self-etching primer on air abraded dentin is recommended to obtain higher bond strengths.
Highlights
The use of conservative cavity design has been made possible due to advances in techniques and restorative materials resulting in adhesive restorations
The acid concentration was reduced, and many studies were developed to create bonding agents that could increase the interaction between dentin and restorative materials
Some studies suggest the use of air abrasion as a possible way to substitute acid etching and to increase adhesion of restorative materials because this technique is based on high speed aluminum oxide im
Summary
The use of conservative cavity design has been made possible due to advances in techniques and restorative materials resulting in adhesive restorations. An effective way to improve bond strength was obtained with the use of the 85% phosphoric acid technique suggested by Buonocore[3] in 1955. The acid concentration was reduced, and many studies were developed to create bonding agents that could increase the interaction between dentin and restorative materials. Superficial smear layer must be removed and subjacent dentin must be slightly demineralized[16]. Acid conditioning can remove the smear layer and dentine mineral, which increases the bond strength, it may cause collagen fiber destabilization, diminishing bond strength when incorrectly used. Some studies suggest the use of air abrasion as a possible way to substitute acid etching and to increase adhesion of restorative materials because this technique is based on high speed aluminum oxide im-
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