Kawasaki Mayuko, Hayakawa Tohru, Takizawa Tsutomu, Sirirungrojying Somsak, Saitoh Kayo, Kasai Kazutaka
Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan.
Angle Orthod. 2003 Dec;73(6):702-9. doi: 10.1043/0003-3219(2003)073<0702:ATPOAM>2.0.CO;2.
Questions over the usefulness of a self-etching primer with resin adhesive in the bonding of orthodontic brackets remain unsolved. The purpose of this study was to determine the effects of using Multibond, a new methyl methacrylate (MMA)-based resin cement with self-etching primer, on the shear bond strength of orthodontic brackets compared with Superbond C&B, which is a well-known MMA-based resin cement containing phosphoric acid etching. Metal or plastic brackets were bonded to etched or self-etching primed bovine teeth using Superbond C&B or Multibond. The shear bond strengths were measured after immersion in water at 37 degrees C for 24 hours. Data were analyzed by two-way analysis of variance and Scheffe's test. The surface appearances of the teeth after phosphoric acid etching or self-etching priming were observed by field-emission scanning electron microscopy (FE-SEM). Metal brackets bonded with Multibond had a significantly lower shear bond strength than metal brackets bonded with Superbond C&B. No significant differences in shear bond strength were observed between Multibond and Superbond C&B when plastic brackets were bonded to the enamel. The shear bond strength of metal brackets bonded with Multibond was comparable with that of plastic brackets bonded with Superbond C&B. Adhesive remnant index score showed a tendency of more residual resin cement remaining on the teeth when metal brackets were bonded with Multibond. FE-SEM observation revealed less dissolution of the enamel surface resulting from treatment with Multibond self-etching primer as compared with phosphoric acid. Thus, the Multibond system may be a candidate for bonding orthodontic brackets with the advantage of minimizing enamel loss.
关于自酸蚀底漆与树脂粘合剂在正畸托槽粘结中效用的问题仍未解决。本研究的目的是确定使用Multibond（一种新型的基于甲基丙烯酸甲酯（MMA）的含自酸蚀底漆的树脂水门汀）与Superbond C&B（一种著名的含磷酸酸蚀的基于MMA的树脂水门汀）相比，对正畸托槽剪切粘结强度的影响。使用Superbond C&B或Multibond将金属或塑料托槽粘结到经酸蚀或自酸蚀底漆处理的牛牙上。在37℃水中浸泡24小时后测量剪切粘结强度。数据采用双向方差分析和谢费检验进行分析。通过场发射扫描电子显微镜（FE-SEM）观察磷酸酸蚀或自酸蚀底漆处理后牙齿的表面外观。与用Superbond C&B粘结的金属托槽相比，用Multibond粘结的金属托槽的剪切粘结强度显著更低。当塑料托槽粘结到牙釉质上时，Multibond和Superbond C&B之间在剪切粘结强度上未观察到显著差异。用Multibond粘结的金属托槽的剪切粘结强度与用Superbond C&B粘结的塑料托槽的剪切粘结强度相当。粘结剂残留指数评分显示，当用Multibond粘结金属托槽时，牙齿上残留的树脂水门汀有更多的趋势。FE-SEM观察显示，与磷酸相比，用Multibond自酸蚀底漆处理导致牙釉质表面的溶解更少。因此，Multibond系统可能是粘结正畸托槽的一个候选方案，其优点是能使牙釉质损失最小化。
