Cadenaro Milena, Breschi Lorenzo, Antoniolli Francesca, Mazzoni Annalisa, Di Lenarda Roberto
UCO of Dental Sciences, Department of Biomedicine, University of Trieste, Trieste, Italy.
Eur J Oral Sci. 2006 Jun;114(3):257-62. doi: 10.1111/j.1600-0722.2006.00351.x.
The aim of this study was to analyze the extent of polymerization of different adhesive systems on whitened dentin. One adhesive of each class was investigated: Adper Scotchbond Multi Purpose (3M ESPE); One-Step (Bisco); Clearfil Protect Bond (Kuraray); and Xeno III (Dentsply DeTrey). Dentin disks were treated with Opalescence Xtra Boost (Ultradent) for 30 min and bonded immediately after 24 h or after 14 d of storage in 100% humidity at 37 degrees C. Unbleached dentin disks were prepared as controls. The extent of polymerization of bonded interfaces was obtained with differential scanning calorimetry (DSC) at 20, 40 and 60 s, and the data were statistically analyzed. The extent of polymerization obtained from DSC exotherms of adhesives applied immediately after whitening was significantly lower compared with controls. An increased extent of polymerization after storage was confirmed for all adhesives, and no difference with controls was found after 14 d. A prolonged irradiation time increased the curing rate for all the tested adhesives. This study supports the hypothesis that polymerization of the adhesive is reduced after dentin whitening and that delayed adhesive application reverses the polymerization inhibition. Prolonged polymerization intervals may counteract the inhibition of polymerization caused by the whitening procedure. Nevertheless, further in vivo studies should validate this issue.
本研究的目的是分析不同粘结系统在美白牙本质上的聚合程度。对每一类的一种粘结剂进行了研究：Adper Scotchbond多用途粘结剂（3M ESPE公司）；一步法粘结剂（Bisco公司）；Clearfil Protect Bond粘结剂（可乐丽公司）；以及Xeno III粘结剂（登士柏西诺德公司）。牙本质盘用Opalescence Xtra Boost（Ultradent公司）处理30分钟，并在24小时后或在37℃、100%湿度下储存14天后立即进行粘结。制备未漂白的牙本质盘作为对照。在20、40和60秒时用差示扫描量热法（DSC）获得粘结界面的聚合程度，并对数据进行统计分析。与对照组相比，美白后立即应用粘结剂的DSC放热曲线得到的聚合程度显著降低。所有粘结剂在储存后的聚合程度均得到证实有所增加，14天后与对照组无差异。延长照射时间可提高所有测试粘结剂的固化速率。本研究支持以下假设：牙本质美白后粘结剂的聚合减少，延迟应用粘结剂可逆转聚合抑制。延长聚合间隔时间可能抵消美白过程对聚合的抑制作用。然而，进一步的体内研究应验证这一问题。
