title: Comparison of marginal microleakage of flowable composite restorations in primary molars prepared by high-speed carbide bur, Er:YAG laser, and air abrasion.
abstract: OBJECTIVE
  The purpose of this study was to assess in vitro the influence of 3 cavity preparation devices (carbide bur, Er:YAG laser, and air abrasion) on the microleakage of flowable composite restorations in primary teeth.
  
  
  METHODS
  Fifteen primary second molars were selected, and Class V cavities were prepared on the buccal/lingual surfaces, being assigned to 3 groups (n= 10). Group 1 (control) was prepared using a high-speed handpiece and was acid etched. Group 2 was prepared and treated with a Er:YAG laser (400mJ/4Hz and 80mJ/4Hz, respectively) and was acid etched. Group 3 was prepared and treated with an air abrasion system and was acid etched. Cavities were restored and stored for 7 days. Restorations were polished, thermocycled, immersed in 0.2% rhodamine B, sectioned, and analyzed for leakage.
  
  
  RESULTS
  Er:YAG laser-prepared cavities showed the highest degree of infiltration. The performance of the air abrasion device was comparable to that of the high-speed handpiece.
  
  
  CONCLUSIONS
  It may be concluded that the method of cavity preparation affected the microleakage of Class V cavities restored with flowable composite in primary teeth.
authors.affiliation: Department of Pediatric Clinics, Social and Preventive Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, Brazil.
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Borsatto
authors.forename: Silmara Aparecida Milori
authors.initials: SA
authors.lastname: Corona
authors.forename: Michelle Alexandra
authors.initials: MA
authors.lastname: Chinelatti
authors.forename: Renata Pereira
authors.initials: RP
authors.lastname: Ramos
authors.forename: Renata Andréa Salvitti
authors.initials: RA
authors.lastname: de Sá Rocha
authors.forename: Jesus Djalma
authors.initials: JD
authors.lastname: Pecora
authors.forename: Regina Guenka
authors.initials: RG
authors.lastname: Palma-Dibb
mesh_terms: D000134:Acid Etching, Dental; D020906:Air Abrasion, Dental / Q000295:instrumentation*; D000538:Aluminum Silicates; D002244:Carbon; D003188:Composite Resins / Q000737:chemistry*; D003737:Dental Cavity Preparation / Q000145:classification / Q000295:instrumentation*; D003754:Dental High-Speed Equipment; D003763:Dental Leakage / Q000145:classification*; D018772:Dental Marginal Adaptation; D003775:Dental Polishing; D003793:Dental Restoration, Permanent / Q000145:classification; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004871:Erbium; D005456:Fluorescent Dyes; D006801:Humans; D007834:Lasers; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008963:Molar / Q000473:pathology*; D010756:Phosphoric Acids / Q000737:chemistry; D012235:Rhodamines; D014094:Tooth, Deciduous / Q000473:pathology*; D015019:Yttrium
chemical_list: D000538:Aluminum Silicates; C115611:BOND-1 adhesive; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005456:Fluorescent Dyes; D008689:Methacrylates; D010756:Phosphoric Acids; D012235:Rhodamines; C111840:flowable hybrid composite; D015019:Yttrium; D002244:Carbon; D004871:Erbium; C030242:phosphoric acid; C029773:rhodamine B