Department of Dental Caries Control and Aesthetic Dentistry, Nihon University School of Dentistry at Matsudo, 870-1 Sakaecho, Nishi 2, Matsudo, Chiba 271-8587, Japan.
J Dent Res. 2011 May;90(5):607-12. doi: 10.1177/0022034510397837. Epub 2011 Feb 4.
We determined the number of reacted and unreacted 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) molecules with calcium during the demineralization process of hydroxyapatite or dentin by 10-MDP-based one-step (Clearfil Tri-S Bond, TS) or two-step self-etch adhesive (Clearfil SE Bond Primer, SE). We then examined the effects of the number of reacted and/or unreacted 10-MDP molecules on the initial bond strength and bond durability of the resultant adhesive layer. The null hypotheses were that (1) the etching efficacy of tooth apatite by 10-MDP used in TS was the same as that in SE, and (2) the unreacted 10-MDP polymer included within the adhesive layer does not affect bond durability. Addition of hydroxyapatite or dentin to the TS and SE resulted in decreases in the NMR peak intensities for 10-MDP. The peak intensity for 10-MDP showed a greater reduction in SE than in TS, consistent with the observation that SE provided significantly higher initial mean bond strengths than TS. Further, the unreacted 10-MDP polymer within the adhesive layer did not decrease the mean bond strength, despite the application of 20,000x thermo-cycling.
我们通过基于 10-MDP 的一步法（Clearfil Tri-S Bond，TS）或两步自酸蚀粘结剂（Clearfil SE Bond Primer，SE），测定了羟磷灰石或牙本质脱矿过程中 10-甲基丙烯酰氧癸基二氢磷酸酯（10-MDP）与钙反应和未反应的 10-MDP 分子数量。然后，我们研究了反应和/或未反应的 10-MDP 分子数量对所得粘结层初始粘结强度和粘结耐久性的影响。零假设为：（1）TS 中 10-MDP 对牙磷灰石的蚀刻效果与 SE 相同；（2）粘结层内包含的未反应 10-MDP 聚合物不会影响粘结耐久性。向 TS 和 SE 添加羟磷灰石或牙本质会降低 10-MDP 的 NMR 峰强度。SE 中的 10-MDP 峰强度比 TS 中的降低更大，这与 SE 提供的初始平均粘结强度明显高于 TS 的观察结果一致。此外，尽管经过 20,000x 热循环处理，粘结层内未反应的 10-MDP 聚合物并未降低平均粘结强度。
