title: [Marginal microleakage of cavities prepared with Er:YAG laser on primary teeth in vitro].
abstract: OBJECTIVE
  To investigate the marginal microleakage after cavity preparation by Er:YAG laser and conventional bur applying different adhesive systems, conditioning surface with acid etching or not.
  
  
  METHODS
  In the study, 50 primary teeth were divided into 5 groups. (1) Bur + etch-and-rinse system, (2) Bur + self-etching system, (3) Er:YAG laser + etch-and-rinse system, (4) Er:YAG laser + self-etching system, (5) Er:YAG laser + none-etched. The class V cavities were all filled with composite resin. The microleakage tests were performed, observed and scored under stereomicroscope.
  
  
  RESULTS
  Bur + etch-and-rinse group had higher microleakage than Er:YAG laser+etch-and-rinse group, and Bur+self-etching group had higher microleakage than Er:YAG laser + self-etching group(P<0.05). There was no difference between Er:YAG laser + etch-and-rinse group and Er:YAG laser + self-etching group, while they had significantly lower microleakage than that of Er:YAG + none-etched group.
  
  
  CONCLUSIONS
  Composite resin restoration showed less marginal microleakage when all-in-one self-etch system was used after irradiation by Er:YAG laser on primary teeth.
authors.affiliation: Department of Endodontic Dentistry, First Clinical Divison, Peking University School and Hospital of Stomatology, Beijing 100034, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Xie
authors.affiliation: Department of Pediatric Dentistry, Peking University School and Hopstital of Stomatology, Beijing 100081,China.
authors.forename: Sun
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Department of Pediatric Dentistry, Peking University School and Hopstital of Stomatology, Beijing 100081,China.
authors.forename: Li-hong
authors.initials: LH
authors.lastname: Ge
mesh_terms: D003188:Composite Resins; D003731:Dental Caries; D003737:Dental Cavity Preparation; D003763:Dental Leakage; D006801:Humans; D053844:Lasers, Solid-State; D014094:Tooth, Deciduous
chemical_list: D003188:Composite Resins