Ireland A J, Sherriff M
Department of Orthodontics, Royal United Hospital, Bath.
Eur J Orthod. 1994 Feb;16(1):27-34. doi: 10.1093/ejo/16.1.27.
To date, most successful bonding agents used in orthodontics rely on mechanical retention to both the enamel and bracket base. Chemical adhesion to enamel as seen with glass ionomer cements, and to the silanated base of ceramic brackets have been tried. Recent developments in resin formulation have led to the production of adhesive diacrylate resins capable of forming adhesive bonds to certain metals including stainless steel. The aim of this experiment was to compare such a resin, Panavia EX, with a more conventional 'no-mix' orthodontic bonding resin. Two different base retention mechanisms were used, and the effect of rebonding and differing environmental conditions were also investigated. The results indicated that Panavia EX could produce greater bond strengths than the more conventional bonding resin. Of the two base retention systems tested, braised mesh bases gave consistently greater bond strengths than the cast base, although no base/resin specificity could be detected. Re-using the same brackets showed rebound strengths to be significantly lower than initial bond strength although the results indicated the adhesive resin was still able to bond more effectively to these used brackets than the conventional resin. Environment had the greatest effect on bond strength, such that following environmental exposure there was no significant difference between the two resins. This latter factor, and in particular the more complex bonding technique required for the adhesive resin, means that Panavia EX cannot be recommended for orthodontic use in its present form.
迄今为止，正畸领域中使用的大多数成功的粘结剂都依赖于对牙釉质和托槽基底的机械固位。人们尝试过玻璃离子水门汀对牙釉质以及陶瓷托槽的硅烷化基底的化学粘结。树脂配方的最新进展已导致生产出能够与包括不锈钢在内的某些金属形成粘结的双丙烯酸酯粘结树脂。本实验的目的是将这样一种树脂（Panavia EX）与一种更传统的“免混合”正畸粘结树脂进行比较。使用了两种不同的基底固位机制，并且还研究了再次粘结和不同环境条件的影响。结果表明，Panavia EX 能够产生比更传统的粘结树脂更高的粘结强度。在所测试的两种基底固位系统中，烧结网基底始终比铸造基底具有更高的粘结强度，尽管未检测到基底/树脂的特异性。重复使用相同的托槽显示，再次粘结强度明显低于初始粘结强度，尽管结果表明粘结树脂对这些用过的托槽的粘结效果仍比传统树脂更有效。环境对粘结强度的影响最大，以至于在环境暴露后，两种树脂之间没有显著差异。后一个因素，特别是粘结树脂所需的更复杂的粘结技术，意味着目前形式的 Panavia EX 不推荐用于正畸。
