title: Effect of air abrasion and resin composite on microleakage of Class V restorations bonded with self-etching primers.
abstract: OBJECTIVE
  The purpose of this in vitro study was to determine the effect of air-abrasion pretreatment on microleakage of Class V resin composite restorations bonded with self-etching primers.
  
  
  METHODS
  A total of 54 Class V cavities prepared either with diamond burs or air abrasion (KCP 1000) was restored with resin composites using adhesive systems with self-etching priming agents (Clearfil Liner Bond 2 or Resulcin AquaPrime + Monobond) and thermocycled 2,500 times. The degree of dye penetration (0.5% methylene blue solution) was scored on an ordinal scale at 25X magnification on longitudinally cut sections of the specimens. Wall adaptation at the tooth-restoration interfaces was evaluated under a SEM using replicas of the sectioned teeth.
  
  
  RESULTS
  Severe microleakage occurred at the gingival dentinal margins, and less microleakage was detected at the enamel cavity margins. Nonparametrical statistical analysis (H-test) demonstrated no significant differences in microleakage among the different groups. Comparison of dye penetration data and SEM findings showed that with both self-etching priming agents, microleakage occurred in the absence of gaps.
  
  
  CONCLUSIONS
  Use of air abrasion in combination with self-etching priming agents cannot prevent microleakage at the dentin-resin interface of Class V resin composite restorations.
authors.affiliation: Department of Operative Dentistry and Periodontology, Albert Ludwig University of Freiburg, Hugstetter Str. 55, D-79106 Freiburg, Germany. hannig@zmk2.ukl.uni-freiburg.de
authors.forename: M
authors.initials: M
authors.lastname: Hannig
authors.forename: B
authors.initials: B
authors.lastname: Fu
mesh_terms: D020906:Air Abrasion, Dental; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000379:methods*; D003763:Dental Leakage / Q000517:prevention & control*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D008964:Molar, Third
chemical_list: C112828:Clearfil AP-X; C084544:Clearfil Linerbond System; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C408602:Liquicoat; C446261:Merz FHC Hybrid Composite; D008689:Methacrylates; C122122:Resulcin aquaPrime