title: Nd:YAG laser influence on microleakage of class V composite restoration.
abstract: OBJECTIVE
  The purpose of this research was to evaluate Nd:YAG laser influence on microleakage of class V composite restorations.
  
  
  BACKGROUND
  There are few studies concerning laser with restorative materials, considering microleakage. One more sent.
  
  
  METHODS
  Thirty six cavities were prepared and divided into three groups (n = 12): group 1, control; group 2, Nd:YAG laser irradiation before adhesive technique; group 3, Nd:YAG laser irradiation after adhesive technique was used as the single bottle. Adhesive system Nd:YAG laser parameters were 320 microm of fiberoptic; energy/pulse of 40 mJ of energy/pulse; repetition rate of 15 Hz; power of 0.6 W; pulsed and non-contact, 1 mm from the surface; 30 seconds in scanning mode; energy density was 49.76 J/cm(2). Cavities were restored with microhybrid composite. After having used a polishing technique, thermocycling and impermeabilization procedures were performed and specimens were submitted to a microleakage test consisting of immersion in aqueous solution of 50% silver nitrate for 8 h, in the total absence of light. After washing and drying procedures, teeth were embedded to facilitate buccal-lingual vertical sectioning. Microleakage was revealed by light.
  
  
  RESULTS
  We accomplished Kruskal-Wallis test at 5% level of confidence and observed no statistically significant difference between the tested groups.
  
  
  CONCLUSIONS
  Based on the obtained results, it was possible to conclude that Nd:YAG laser in the parameters used, has no influence on marginal microleakage in composite restorations, independent of the moment the laser was used.
authors.affiliation: Operative Dentistry, UNICID, R. Jose Debieux 460, Santana, São Paulo, SP, Brazil 02038-030.
authors.forename: F A
authors.initials: FA
authors.lastname: Kawaguchi
authors.forename: C P
authors.initials: CP
authors.lastname: Eduardo
authors.forename: A B
authors.initials: AB
authors.lastname: Matos
mesh_terms: D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000494:pharmacology / Q000528:radiation effects*; D003737:Dental Cavity Preparation / Q000379:methods; D003763:Dental Leakage / Q000517:prevention & control*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D028022:Low-Level Light Therapy / Q000379:methods*; D023421:Models, Animal; D009354:Neodymium; D012016:Reference Values; D012680:Sensitivity and Specificity; D012835:Silver Nitrate / Q000494:pharmacology
chemical_list: D003188:Composite Resins; D009354:Neodymium; D012835:Silver Nitrate