三种牙本质黏结剂从涂布到光固化挥发时间对其微拉伸强度的影响

Effects of Volatilization Time of Three Dentin Adhesives before Light Curing on Micro-tensile Bond Strength to Dentin

目的比较和评价Gluma One-Bond(OB)、Single Bond(SB)和Clearfil SE Bond(SE)3种黏结剂从涂布到光固化挥发暴露时间对其微拉伸强度的影响,得出时间量化指标,为临床操作提供参考。方法采用微拉伸强度测试法比较3种牙本质黏结剂(OB,SB和SE)分别涂布10,20,30,40和50s后的微拉伸强度,并在扫描电镜下观察断面微观形态。结果 OB、SB和SE 10s组的微拉伸强度值明显低于20s组、30s组、40s组与50s组,差异有统计学意义,20s后微拉伸强度达峰值,之后结果保持稳定,后4组的微拉伸强度均值间无统计学意义。扫描电镜下观察发现,3种黏结剂的20s组、30s组、40s组和50s组牙本质小管口的封闭情况都比10s组好;SE中20s组、30s组、40s组和50s组均比OB和SB中相应秒组的牙本质小管口封闭情况要好。结论 3种黏结剂从涂布到光固化暴露挥发时间从20s后即可获得理想的黏结强度。

Objective To develop quantitative indicators for evaluating the effects of volatilization time of three dentin adhesive systems before light curing on microtensile bond strengths,and to provide a reference for clinical treatment.Methods The microtensile bond strengths of three different dentine adhesives（Gluma One-Bond,Single Bond and Clearfil SE Bond） were determined by microtensile bond test at 10,20,30,40 and 50 seconds after the application of adhesive coating.The interface of fractured bond was observed by scanning electron microscopy（SEM）.Results Microtensile bond strength at 10 seconds after adhesive coating was significantly lower than that at 20,30,40 and 50 seconds after adhesive coating for all three adhesives.The peak values of microtensile bond strength were obtained after 20 seconds and differences were not significant among values after 20,30,40 and 50 seconds.SEM showed that occluding situations of dentinal tubules at 20,30,40 and 50 seconds after adhesive coating were better than those at 10 seconds after adhesive coating and Clearfil SE Bond specimens had better occluding situations than Gluma One-Bond and Single Bond specimens.Conclusions The desired dentin bond strength can be achieved by volatilization time of at least 20 seconds.