title: Sealing of silorane-based composite in laser-prepared primary teeth: effect of acid etching.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the influence of prior etching on the sealing of silorane composite restorations in Class V cavity preparations prepared with an Er,Cr:YSGG laser compared to bur preparation in primary teeth.
  
  
  METHODS
  Standard Class V cavity preparations were prepared on the buccal surfaces of 56 extracted primary canines and randomly divided into four groups of 14 teeth each, according to laser or bur preparation and the use of prior acid etching in the preparation. All cavity preparations were restored with silorane adhesive and silorane composite. After water storage and thermocycling, the specimens were placed in 0.5 percent basic fuchsin dye solution. Dye penetration was evaluated with a stereomicroscope. The data were analyzed with nonparametric tests (P=.05).
  
  
  RESULTS
  Laser preparation and prior etching in bur-prepared cavity preparation had no significant effect on enamel sealing (P>.05), but significantly increased microleakage at the dentin margin (P<.001 and P=.001, respectively). Prior etching in laser-prepared cavity preparations significantly improved sealing at the enamel and dentin margins (P=.009 and P=.003, respectively).
  
  
  CONCLUSIONS
  Prior acid etching may be necessary to ensure good marginal sealing when laser preparation is used. However, this step is not required when bur cutting is used in primary teeth.
authors.affiliation: Department of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: Fereshteh
authors.initials: F
authors.lastname: Shafiei
authors.affiliation: Department of Pediatric Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. memarpour@sums.ac.ir.
authors.forename: Mahtab
authors.initials: M
authors.lastname: Memarpour
authors.affiliation: Periodontal Department, Laser Research Center in Medical Sciences (LRCMS), AJA University of Medical Sciences, Tehran, Iran.
authors.forename: Reza
authors.initials: R
authors.lastname: Fekrazad
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry*; D003481:Cuspid / Q000473:pathology; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification / Q000295:instrumentation*; D003743:Dental Enamel / Q000648:ultrastructure; D003763:Dental Leakage / Q000145:classification; D003764:Dental Materials / Q000737:chemistry*; D003804:Dentin / Q000648:ultrastructure; D006801:Humans; D053685:Laser Therapy / Q000295:instrumentation*; D053844:Lasers, Solid-State / Q000627:therapeutic use; D012394:Rosaniline Dyes; D062047:Silorane Resins / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014094:Tooth, Deciduous / Q000648:ultrastructure*; D014867:Water / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D003188:Composite Resins; D003764:Dental Materials; D012394:Rosaniline Dyes; D062047:Silorane Resins; D014867:Water; C025485:basic fuchsin