Dishman M V, Covey D A, Baughan L W
Department of General Practice, Medical College of Virginia, Virginia Commonwealth University, Richmond.
Dent Mater. 1994 Jan;10(1):33-6. doi: 10.1016/0109-5641(94)90019-1.
The objective of this in vitro study was to evaluate the effects of an in-office type of bleaching regimen on the composite to enamel bond.
The enamel on forty extracted human teeth was subjected to a 25% hydrogen peroxide bleaching treatment. Ten additional unbleached specimens served as controls (Group A). The 40 bleached specimens were divided into four equal groups (Groups B-E). Composite cylinders were bonded to the prepared surfaces at various time intervals following bleaching. Group B was bonded immediately, Group C at 1 d, Group D at 1 wk, and Group E at 1 mon post-bleaching.
Mean shear bond strength values showed a significant decrease in bond strength for Group B. However, the bond strength returned to normal values after 1 d and remained normal for at least 1 mon. Scanning electron microscope examination showed an apparent decrease in the number of resin tags present in the enamel/composite interface for Group B compared with the other groups including controls.
Polymerization inhibition of the resin bonding agent is the likely mechanism for the effects of the bleaching on bond strength.
本体外研究的目的是评估诊室式漂白方案对复合树脂与牙釉质粘结的影响。
对40颗拔除的人牙的牙釉质进行25%过氧化氢漂白处理。另外10个未漂白的标本作为对照（A组）。40个漂白后的标本被分成四个相等的组（B - E组）。在漂白后的不同时间间隔，将复合树脂圆柱体粘结到制备好的表面。B组立即粘结，C组在漂白后1天粘结，D组在1周后粘结，E组在1个月后粘结。
平均剪切粘结强度值显示B组的粘结强度显著降低。然而，粘结强度在1天后恢复到正常值，并至少在1个月内保持正常。扫描电子显微镜检查显示，与包括对照组在内的其他组相比，B组牙釉质/复合树脂界面处的树脂突数量明显减少。
树脂粘结剂的聚合抑制可能是漂白影响粘结强度的机制。
