Division of Bioengineering, School of Dentistry, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Japan.
J Adhes Dent. 2011 Feb;13(1):49-54. doi: 10.3290/j.jad.a18238.
This study examined the effect of dentin pretreatment with acetone or ethanol on bonding of one-bottle self-etching vs two-step self-etching adhesives to evaluate the effect of hydration on bond strength.
The bond strengths of resins were measured using two one-bottle and two two-step selfetching adhesives that bonded to wet dentin (control), or acetone- or ethanol-pretreated dentin. Wet dentin is the normal substrate for bond testing, and in the pretreatment groups, 95% acetone or ethanol was applied to the dentin surface for 30 s before bonding. Weight of resin adhesives before and after evaporation was measured to evaluate the extent of the solvent contents in the adhesives. Furthermore, phase separation of adhesives was morophologically investigated by in situ light-microscopic observation to evaluate the hydrophilicity of the adhesive resins.
The bond strengths of the acetone and ethanol groups for one-bottle adhesives were significantly greater than for the control (p < 0.05). However, significantly lower bond strengths were found in the pretreatment groups for the two-step self-etching adhesives (p < 0.05).
The bond strength depended on the wetness of the bonding substrate for both adhesive groups, with a positive effect in bond strength for one-bottle adhesives and a negative effect for two-bottle self-etching adhesives. The acetone- or ethanol-pretreated dentin surfaces may provide an improved substrate for resin adhesion of hydrophilic self-etching adhesives such as one-bottle self-etching adhesives due to dentin dehydration.
本研究通过考察丙酮或乙醇预处理牙本质对单瓶自酸蚀与两步自酸蚀黏结剂黏结性能的影响，评估水合作用对黏结强度的影响。
使用两种单瓶和两种两步自酸蚀黏结剂，分别黏结于湿牙本质（对照组）、丙酮预处理牙本质或乙醇预处理牙本质，测量树脂的黏结强度。湿牙本质是黏结强度测试的正常底物，在预处理组中，在黏结前将 95%丙酮或乙醇应用于牙本质表面 30 s。通过测量黏结剂在蒸发前后的重量，评估黏结剂中溶剂含量的程度。此外，通过原位光镜观察评估黏结树脂的亲水性，对黏结剂的相分离进行形态学研究。
单瓶黏结剂的丙酮和乙醇组的黏结强度明显大于对照组（p < 0.05）。然而，两步自酸蚀黏结剂预处理组的黏结强度显著降低（p < 0.05）。
对于两种黏结剂组，黏结强度取决于黏结底物的湿润度，对单瓶黏结剂有增强黏结强度的作用，对两步自酸蚀黏结剂有减弱黏结强度的作用。由于牙本质脱水，丙酮或乙醇预处理牙本质表面可能为亲水性自酸蚀黏结剂（如单瓶自酸蚀黏结剂）提供更好的树脂黏附基底。
