title: Shear bond strength of adhesive systems to enamel and dentin. Thermocycling influence.
abstract: OBJECTIVE
  The purpose of the this study was to evaluate the influence of thermocycling on shear bond strength on bovine enamel and dentin surfaces of different adhesive systems.
  
  
  METHODS
  Thirty sound bovine incisors were sectioned in mesiodistal and inciso-cervical direction obtaining 60 incisal surfaces (enamel) and 60 cervical surfaces (dentin). Specimens were randomly assigned to 3 groups of equal size (n=40), according to the adhesive system used: I-Single Bond; II-Prime & Bond NT/NRC; III-One Coat Bond. After 24-h storage in distilled water at 37 degrees C, each main group was divided into two subgroups: A-specimens tested after 24 h storage in distilled water at 37 degrees C; B-specimens submitted to thermocycling (500 cycles). Shear bond strength tests were performed. Data were submitted to ANOVA and Tukey test.
  
  
  RESULTS
  Means (MPa) of different groups were: I-AE-16.96, AD-17.46; BE-21.60, BD-12.79; II-AE-17.20, AD-11.93; BE-20.67, BD-13.94; III-AE-25.66, AD-17.53; BE-24.20, BD-19.38.
  
  
  CONCLUSIONS
  Thermocycling did not influence significantly the shear bond strength of the tested adhesive systems; enamel was the dental substrate that showed larger adhesive strength; One Coat Bond system showed the best adhesive strength averages regardless of substrate or thermocycling.
authors.affiliation: Department of Operative Dentistry, Bauru School of Dentistry, University of São Paulo, Brazil.
authors.forename: Patrícia Aleixo
authors.initials: PA
authors.lastname: Dos Santos
authors.forename: Patrícia Petromilli Nordi Sasso
authors.initials: PP
authors.lastname: Garcia
authors.forename: Regina Guenka
authors.initials: RG
authors.lastname: Palma-Dibb
mesh_terms: D000268:Adhesiveness; D000818:Animals; D001672:Biocompatible Materials / Q000032:analysis / Q000737:chemistry*; D002417:Cattle; D003738:Dental Cements / Q000737:chemistry*; D003743:Dental Enamel / Q000502:physiology*; D003804:Dentin / Q000502:physiology*; D007180:Incisor / Q000502:physiology* / Q000648:ultrastructure; D008422:Materials Testing; D010507:Periodicity; D033081:Shear Strength; D013696:Temperature
chemical_list: D001672:Biocompatible Materials; D003738:Dental Cements