Montasser Mona A, Drummond James L, Roth John R, Al-Turki Lulwa, Evans Carla A
Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Angle Orthod. 2008 May;78(3):537-44. doi: 10.2319/022707-102.1.
The hypothesis of this two-part study is that adhesive systems for bonding orthodontic brackets (ie, two self-etch primers [Transbond and M-Bond] and a conventional phosphoric acid etch [Rely-a-Bond]) would show a difference with respect to rebonded enamel surface morphology and chemical composition.
This study examined the enamel surface before and after debonding with scanning electron microscopy and the enamel surface chemical composition for the elements Ca, P, O, F, Si, and C using x-ray photoelectron spectroscopy.
The etching of the two self-etch groups is less aggressive and less uniform than that of phosphoric acid. The change in the concentration of C indicated that the separation of the bracket from the enamel surface is at the resin-enamel interface for the phosphoric acid-etched adhesive and a mixed mode involving the enamel-resin-bracket interfaces for the self-etching systems. F release appears to occur for Transbond but not for M-Bond.
The results confirm the original hypothesis that differences in adhesive systems are manifested in less aggressive etches and less adhesive left on the enamel surface for the self-etching adhesive systems.
这项分为两部分的研究的假设是，用于粘结正畸托槽的粘结系统（即两种自酸蚀底漆[Transbond和M-Bond]以及一种传统的磷酸酸蚀剂[Rely-a-Bond]）在再粘结釉质表面形态和化学成分方面会表现出差异。
本研究使用扫描电子显微镜检查了脱粘前后的釉质表面，并使用X射线光电子能谱分析了釉质表面中钙、磷、氧、氟、硅和碳元素的化学成分。
与磷酸相比，两种自酸蚀组的酸蚀作用较弱且不太均匀。碳浓度的变化表明，对于磷酸酸蚀粘结剂，托槽与釉质表面的分离发生在树脂-釉质界面，而对于自酸蚀系统，则是涉及釉质-树脂-托槽界面的混合模式。Transbond似乎会释放氟，而M-Bond则不会。
结果证实了最初的假设，即自酸蚀粘结系统的粘结系统差异表现为酸蚀作用较弱，且留在釉质表面的粘结剂较少。
