title: Study of microleakage at class V cavities prepared by Er:YAG laser using rewetting surface treatment.
abstract: OBJECTIVE
  This study was conducted to analyze microleakage in Class V cavity preparation, using rewetting (or not) just after burr or Er:YAG laser preparation of enamel and dentin walls in permanent teeth.
  
  
  BACKGROUND
  Several studies reported microleakage around composite restorations when cavity preparation was done or treated by Er:YAG laser. As the hybridized laser is removed when this laser is used to cut dental hard tissue, there is a need for new materials or techniques to minimize gaps and microleakage.
  
  
  RESULTS
  Primer solution showed significant effect in enamel and dentin, at the level of 5%, when Er:YAG laser was used as a cutting tool. Using primer solution after phosphoric acid in preparations with the laser, microleakage was similar in degree to when cavities were prepared with the burr.
  
  
  CONCLUSIONS
  Re-wetting surface just after Er:YAG irradiation and chemical treatment with phosphoric acid using HEMA aqueous solution seems to improve the quality of bioattachment between the adhesive system and enamel/dentin, showing similarities between restoration behaviors independently of the cutting tool, whether burr or laser.
authors.affiliation: Instituto de Física de São Carlos, USP, São Carlos, Brazil. lizarelli@if.sc.usp.br
authors.forename: R F Z
authors.initials: RF
authors.lastname: Lizarelli
authors.forename: P C G
authors.initials: PC
authors.lastname: Silva
authors.forename: S T Porto
authors.initials: ST
authors.lastname: Neto
authors.forename: V S
authors.initials: VS
authors.lastname: Bagnato
mesh_terms: D000134:Acid Etching, Dental; D003188:Composite Resins; D003737:Dental Cavity Preparation; D003738:Dental Cements; D003763:Dental Leakage; D006801:Humans; D066298:In Vitro Techniques; D007834:Lasers; D010756:Phosphoric Acids; D014906:Wetting Agents
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D010756:Phosphoric Acids; D014906:Wetting Agents; C030242:phosphoric acid