title: Evaluation of the microtensile bond strength of composite resin restoration in dentin prepared with different sizes of aluminum oxide particles, using the air abrasion system.
abstract: OBJECTIVE
  The purpose of this in vitro study was to evaluate the influence of the abrasive technique on the microtensile bond strength of composite resin restorations. In addition, any differences in the microtensile bond strength were observed when different aluminum oxide particle sizes were used.
  
  
  METHODS
  Flat coronal dentin surfaces were randomly distributed into 3 groups, according to surface treatment: Group A27 Air-abraded dentin with 27 microm aluminum oxide particles; Group A50-Air-abraded dentin with 50 microm aluminum oxide particles; Group HS cut dentin with a #1013 diamond bur in high-speed rotary instrument. After the bonding procedure (Single Bond/Z100), the teeth were stored in distilled water at 37 masculineC for 48 h prior to sectioning. Then, each bonded tooth was longitudinally sectioned producing sticks with a cross-sectional area of 0.81 mm2. The tensile load was applied at a crosshead speed of 0.5 mm/min, until the stick fractured. The data were analyzed by one-way ANOVA and post hoc multiple comparisons using Tukey's test.
  
  
  RESULTS
  No difference was observed in composite bond strength when 27 and 50 microm aluminum oxide particles were used for dentin surface preparation using an air abrasion system. However, air-abraded dentin, using 27 microm aluminum oxide particles, demonstrated a higher bond strength when compared to dentin prepared by the conventional method (bur in high-speed).
  
  
  CONCLUSIONS
  The air-abraded dentin, using 27 microm alumina powder, demonstrated higher composite bond strength when compared to bur-cut dentin, raising the possibility that this method may increase restoration longevity.
authors.affiliation: Department of Pediatric Dentistry, Araraquara Dental School, University of São Paulo State Araraquara, São Paulo, Brazil. cmotisuki@yahoo.com.br
authors.forename: C
authors.initials: C
authors.lastname: Motisuki
authors.forename: L
authors.initials: L
authors.lastname: Monti Lima
authors.forename: M
authors.initials: M
authors.lastname: Emi Sanabe
authors.forename: P
authors.initials: P
authors.lastname: Jacques
authors.forename: L
authors.initials: L
authors.lastname: Santos-Pinto
mesh_terms: D000180:Acrylic Resins; D020906:Air Abrasion, Dental; D000537:Aluminum Oxide; D003188:Composite Resins; D001840:Dental Bonding; D006801:Humans; D010316:Particle Size; D011140:Polyurethanes; D011897:Random Allocation; D013718:Tensile Strength
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes; D000537:Aluminum Oxide