title: Effect of Er:YAG laser on bond strength to dentin of a self-etching primer and two single-bottle adhesive systems.
abstract: OBJECTIVE
  To assess the effect of erbium:yttrium aluminium garnet (Er:YAG) laser on bond strength to dentin of a self-etching primer (Clearfil Liner Bond 2V, CL2V) and two single-bottle agents (Excite, EX; Gluma One Bond, GB).
  
  
  METHODS
  Thirty human molars were selected, roots were removed and crowns were bisected, providing 60 halves. Specimens were included and ground to expose dentin. Bonding site was limited and samples were assigned to three groups: I, CL2V; II, EX; III, GB. Dentin was either conventionally treated or submitted to laser conditioning + conventional treatment. The adhesive protocol was performed, samples were stored for 24 hours and bond strength was tested to failure (0.5 mm/min).
  
  
  RESULTS
  Statistical analysis showed a decrease in bond strength for lased subgroups and this drop was more evident for EX. CL2V provided the best overall results, regardless of the surface treatment.
  
  
  CONCLUSIONS
  Er:YAG laser may adversely affect bond strength in higher or lesser degree, depending on the adhesive system used.
authors.affiliation: Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, Av. do Café, S/N Monte Alegre, Cep: 14040-904, Ribeirão Preto-SP, Brasil. virtualr@netsite.com.br
authors.forename: Renata P
authors.initials: RP
authors.lastname: Ramos
authors.forename: Daniela T
authors.initials: DT
authors.lastname: Chimello
authors.forename: Michelle A
authors.initials: MA
authors.lastname: Chinelatti
authors.forename: Tomio
authors.initials: T
authors.lastname: Nonaka
authors.forename: Jesus D
authors.initials: JD
authors.lastname: Pécora
authors.forename: Regina G
authors.initials: RG
authors.lastname: Palma Dibb
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000704:Analysis of Variance; D003188:Composite Resins / Q000528:radiation effects*; D003804:Dentin / Q000528:radiation effects* / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000528:radiation effects*; D004871:Erbium; D006801:Humans; D007834:Lasers / Q000009:adverse effects*; D013718:Tensile Strength / Q000528:radiation effects; D015019:Yttrium
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D015019:Yttrium; D004871:Erbium