title: Bond strength durability of self-etching adhesives and resin cements to dentin.
abstract: OBJECTIVE
  To evaluate the microtensile bond strength (microTBS) of one- (Xeno III, Dentsply) and two-step (Tyrian-One Step Plus, Bisco) self-etching adhesive systems bonded to dentin and cemented to chemically cured (C&B Metabond) or light-cured paste of a dual-cure resin cement (Variolink II, Ivoclar) within a short (24 h) and long period of evaluation (90 days).
  
  
  METHODS
  Forty recently extracted human molars had their roots removed and their occlusal dentin exposed and ground wet with 600-grit SiC paper. After application of one of the adhesives, the resin cement was applied to the bonded surface and a composite resin block was incrementally built up to a height of 5 mm (n=10). The restored teeth were stored in distilled water at 37 degrees C for 7 days. The teeth were then cut along two axes (x and y), producing beam-shaped specimens with 0.8 mm(2) cross-sectional area, which were subjected to microTBS testing at a crosshead speed of 0.05 mm/min and stressed to failure after 24 h or 90 days of storage in water. The microTBS data in MPa were subjected to three-way analysis of variance and Tukey's test (alpha= 0.05).
  
  
  RESULTS
  The interaction effect for all three factors was statistically significant (three-way ANOVA, p<0.001). All eight experimental means (MPa) were compared by the Tukey's test (p<0.05) and the following results were obtained: Tyrian-One Step Plus /C&B/24 h (22.4+/-7.3); Tyrian-One Step Plus /Variolink II/24 h (39.4+/-11.6); Xeno III/C&B/24 h (40.3+/-12.9); Xeno III/Variolink II/24 h (25.8+/-10.5); Tyrian-One Step Plus /C&B/90 d (22.1+/-12.8) Tyrian-One Step Plus/VariolinkII/90 d (24.2+/-14.2); Xeno III/C&B/90 d (27.0+/-13.5); Xeno III/Variolink II/90 d (33.0+/-8.9).
  
  
  CONCLUSIONS
  Xeno III/Variolink II was the luting agent/adhesive combination that provided the most promising bond strength after 90 days of storage in water.
authors.affiliation: Dental School of Araraquara, São Paulo State University, Araraquara, SP, Brazil.
authors.forename: Carolina de Andrade Lima
authors.initials: CA
authors.lastname: Chaves
authors.forename: Renata Marques
authors.initials: RM
authors.lastname: de Melo
authors.forename: Sheila Pestana
authors.initials: SP
authors.lastname: Passos
authors.forename: Fernanda Pelógia
authors.initials: FP
authors.lastname: Camargo
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Bottino
authors.forename: Ivan
authors.initials: I
authors.lastname: Balducci
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000269:Adhesives; D001840:Dental Bonding; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing; D008963:Molar; D019279:Resin Cements; D013718:Tensile Strength; D014867:Water
chemical_list: D000269:Adhesives; D017220:Dentin-Bonding Agents; D019279:Resin Cements; D014867:Water