title: Effects of solvent volatilization time on the bond strength of etch-and-rinse adhesive to dentin using conventional or deproteinization bonding techniques.
abstract: OBJECTIVE
  This study determined the effect of the air-stream application time and the bonding technique on the dentin bond strength of adhesives with different solvents. Furthermore, the content and volatilization rate of the solvents contained in the adhesives were also evaluated.
  
  
  METHODS
  Three adhesive systems with different solvents (Stae, SDI, acetone; XP Bond, Dentsply De Trey, butanol; Ambar, FGM, ethanol) were evaluated. The concentrations and evaporation rates of each adhesive were measured using an analytical balance. After acid-etching and rinsing, medium occlusal dentin surfaces of human molars were kept moist (conventional) or were treated with 10% sodium hypochlorite for deproteinization. After applying adhesives over the dentin, slight air-stream was applied for 10, 30 or 60 sec. Composite cylinders were built up and submitted to shear testing. The data were submitted to ANOVA and Tukey's test (α = 0.05).
  
  
  RESULTS
  Stae showed the highest solvent content and Ambar the lowest. Acetone presented the highest evaporation rate, followed by butanol. Shear bond strengths were significantly affected only by the factors of 'adhesive' and 'bonding technique' (p < 0.05), while the factor 'duration of air-stream' was not significant. Deproteinization of dentin increased the bond strength (p < 0.05). Stae showed the lowest bond strength values (p < 0.05), while no significant difference was observed between XP Bond and Ambar.
  
  
  CONCLUSIONS
  Despite the differences in content and evaporation rate of the solvents, the duration of air-stream application did not affect the bond strength to dentin irrespective of the bonding technique.
authors: School of Dentistry, Federal University of Sergipe, Aracaju, Brazil.
authors: José Aginaldo
authors: JA
authors: de Sousa Júnior
authors: School of Dentistry, Federal University of Sergipe, Aracaju, Brazil.
authors: Márcia Luciana
authors: ML
authors: Carregosa Santana
authors: Graduate Program in Dentistry, Federal University of Sergipe, Aracaju, Brazil.
authors: Fabricio Eneas Diniz
authors: FE
authors: de Figueiredo
authors: School of Dentistry, Federal University of Sergipe, Aracaju, Brazil.
authors: André Luis
authors: AL
authors: Faria-E-Silva
keywords: Air-stream application time; Dental bonding; Dentin bonding agents; Evaporation rate; Shear bond strength; Solvents