Abstract
The purpose of this study was to evaluate the shear resistance of a composite resin to the enamel surface of deciduous teeth after acid etching surface with or without previous air abrasion. Sixteen sound exfoliated deciduous incisors were assigned to 2 groups. Group I was acid etched with 37% phosphoric acid and Group II was air abraded with 50-mm aluminum oxide particles for 15 seconds, at 80 psi and a 5-mm distance from the dental surface. The adhesive system Scotchbond Multi Purpose and Z100 composite resin was applied on both experimental groups. The Student’s t test demonstrated significant statistical difference between the groups (p=0.0001). The mean shear bond strengths for groups I and II are 10.65 MPa and 6.32 MPa, respectively. The authors concluded that the maximum bond strength was achieved by isolated acid etching, which yielded a significantly larger shear resistance than in combination with air abrasion.
Highlights
In agreement with Kanellis[14] (1995), the development of the air abrasion technique allowed a reduction of one third of the time required by acid etching for sealant application, which was regarded as an important factor for child care
The deciduous teeth can present differences in the adhesive strength after acid etching and air abrasion. Considering all such controversies in the literature, this study aimed at evaluating the shear resistance of a composite resin to the enamel surface of sound deciduous teeth after acid etching of the enamel, with or without air abrasion
Nikaido et al.[23] (1996) demonstrated that the treatment of bovine enamel surface through the air abrasion technique reduced the bond strength, except for dentin air abraded with alumina
Summary
The advent of acid etching and adhesive systems allowed for more conservative preparations, eliminating the need to accomplish additional retentive features, simplifying the restorative procedures and making them shorter in time.In agreement with Kanellis[14] (1995), the development of the air abrasion technique allowed a reduction of one third of the time required by acid etching for sealant application, which was regarded as an important factor for child care.Air abrasion removes dental structure by means of aluminum oxide particles, which are bounced of tooth structure through kinetic energy,[20,26] bringing about minimum fatigue, tension[20] or anxiety.[3,26]This technique has some advantages compared to the conventional rotatory system for cavity preparation.More comfort may be provided to the patient, due to the possibility to accomplish the cavity preparation without pain, vibration, pressure, heating and noise[12,18,19,25], besides absence of the typical unpleasant smell associated at times with caries removal[11,27]. The advent of acid etching and adhesive systems allowed for more conservative preparations, eliminating the need to accomplish additional retentive features, simplifying the restorative procedures and making them shorter in time. Air abrasion removes dental structure by means of aluminum oxide particles, which are bounced of tooth structure through kinetic energy,[20,26] bringing about minimum fatigue, tension[20] or anxiety.[3,26]. This technique has some advantages compared to the conventional rotatory system for cavity preparation. According to Christensen[7] (1997), these characteristics prevent psychological trauma to anxious patients and young children
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