title: Effect of additional etching and ethanol-wet bonding on the dentin bond strength of one-step self-etch adhesives.
abstract: OBJECTIVE
  This study examined the effects of additional acid etching on the dentin bond strength of one-step self-etch adhesives with different compositions and pH. The effect of ethanol wetting on etched dentin bond strength of self-etch adhesives was also evaluated.
  
  
  METHODS
  Forty-two human permanent molars were classified into 21 groups according to the adhesive types (Clearfil SE Bond [SE, control]; G-aenial Bond [GB]; Xeno V [XV]; Beauti Bond [BB]; Adper Easy Bond [AE]; Single Bond Universal [SU]; All Bond Universal [AU]), and the dentin conditioning methods. Composite resins were placed on the dentin surfaces, and the teeth were sectioned. The microtensile bond strength was measured, and the failure mode of the fractured specimens was examined. The data were analyzed statistically using two-way ANOVA and Duncan's post hoc test.
  
  
  RESULTS
  In GB, XV and SE (pH ≤ 2), the bond strength was decreased significantly when the dentin was etched (p < 0.05). In BB, AE and SU (pH 2.4 - 2.7), additional etching did not affect the bond strength (p > 0.05). In AU (pH = 3.2), additional etching increased the bond strength significantly (p < 0.05). When adhesives were applied to the acid etched dentin with ethanol-wet bonding, the bond strength was significantly higher than that of the no ethanol-wet bonding groups, and the incidence of cohesive failure was increased.
  
  
  CONCLUSIONS
  The effect of additional acid etching on the dentin bond strength was influenced by the pH of one-step self-etch adhesives. Ethanol wetting on etched dentin could create a stronger bonding performance of one-step self-etch adhesives for acid etched dentin.
authors: Department of Conservative Dentistry, School of Dentistry, Pusan National University, Yangsan, Korea.
authors: Joonghee
authors: J
authors: Ahn
authors: Department of Conservative Dentistry, School of Dentistry, Pusan National University, Yangsan, Korea.
authors: Kyoung-Hwa
authors: KH
authors: Jung
authors: Department of Conservative Dentistry, School of Dentistry, Pusan National University, Yangsan, Korea.
authors: Sung-Ae
authors: SA
authors: Son
authors: Department of Conservative Dentistry, School of Dentistry, Pusan National University, Yangsan, Korea.
authors: Bock
authors: B
authors: Hur
authors: Department of Dental Materials, School of Dentistry, Pusan National University, Yangsan, Korea.
authors: Yong-Hoon
authors: YH
authors: Kwon
authors: Department of Conservative Dentistry, School of Dentistry, Pusan National University, Yangsan, Korea.
authors: Jeong-Kil
authors: 0000-0001-6333-8138
authors: JK
authors: Park
keywords: Ethanol-wet bonding; One-step self-etch adhesive; pH of adhesives