Bourke B M, Rock W P
Department of Orthodontics, School of Dentistry, University of Birmingham, Birmingham, U.K.
Br J Orthod. 1999 Dec;26(4):285-90. doi: 10.1093/ortho/26.4.285.
The aim of this investigation was to establish a regime for orthodontic bonding to feldspathic porcelain, which ensures adequate bond strength (6-8 MPa) with minimal damage on debond and consisted of an ex vivo investigation measuring the effects of porcelain surface preparation and thermocycling on shear bond strength of orthodontic brackets. One-hundred-and-twenty feldspathic porcelain bonded crown surfaces were divided into 12 equally-sized groups to assess the effects of: (1) glaze removal, (2) application of hydrofluoric acid, phosphoric acid, or omission of acid treatment, and (3) silane priming upon the bond strength of premolar brackets bonded with Right-on (TM) composite resin adhesive. Specimens were subjected to thermocycling and then to shear debonding forces on an Instron machine. Removal of the porcelain glaze, or use of hydrofluoric acid, prior to bonding were found to be unnecessary to secure the target bond strength. Hydrofluoric acid application was associated with increased porcelain surface damage. Thermocycling caused a significant reduction in shear bond strength to porcelain (P < 0*001). The best regime for orthodontic bonding to feldspathic porcelain was to apply phosphoric acid for 60 seconds, and prime with silane prior to bonding. Usually the porcelain surfaces could be repolished. Refereed Paper
本研究的目的是建立一种用于正畸托槽与长石质瓷粘结的方法，该方法能确保足够的粘结强度（6 - 8兆帕），且在脱粘时损伤最小，并包括一项体外研究，测量瓷表面处理和热循环对正畸托槽剪切粘结强度的影响。120个长石质瓷粘结冠表面被分为12个等大小的组，以评估以下因素的影响：（1）去除釉质；（2）应用氢氟酸、磷酸或不进行酸处理；（3）使用硅烷底漆对用Right-on（TM）复合树脂粘结剂粘结的前磨牙托槽粘结强度的影响。样本先进行热循环，然后在英斯特朗试验机上施加剪切脱粘力。结果发现，在粘结前去除瓷釉或使用氢氟酸对于确保目标粘结强度并非必要。应用氢氟酸会导致瓷表面损伤增加。热循环导致与瓷的剪切粘结强度显著降低（P < 0.001）。正畸与长石质瓷粘结的最佳方法是施加磷酸60秒，并在粘结前用硅烷底漆处理。通常瓷表面可以重新抛光。论文（已审阅）
