Sargison A E, McCabe J F, Millett D T
Department of Child Dental Health, Newcastle Dental School, Newcastle Upon Tyne, UK.
Br J Orthod. 1999 Jun;26(2):141-6. doi: 10.1093/ortho/26.2.141.
A laboratory investigation to compare the mean shear debonding force and mode of bond failure of metallic brackets bonded to sandblasted and acid-etched enamel is described. The buccal surfaces of 30 extracted human premolars were sandblasted for 5 seconds with 50 mu alumina and the buccal surfaces of a further 30 human premolars were etched with 37 per cent phosphoric acid for 15 seconds. Following storage for 24 hours at 37 degrees C in distilled water, shear debonding force was measured using an Instron Universal Testing Machine with a cross-head speed of 10 mm/minute. Mean shear debonding force was significantly lower for brackets bonded to sandblasted enamel compared to acid etched enamel (P < 0.001). Weibull analysis showed that at a given stress the probability of failure was significantly greater for brackets bonded to sandblasted enamel. Brackets bonded to etched enamel showed a mixed mode of bond failure whereas following sandblasting, failure was adhesive at the enamel/composite interface (P < 0.01).
本文描述了一项实验室研究，旨在比较金属托槽粘结在喷砂处理和酸蚀处理的牙釉质上的平均剪切脱粘力及粘结失败模式。对30颗拔除的人类前磨牙的颊面用50微米氧化铝喷砂5秒，另外30颗人类前磨牙的颊面用37%的磷酸酸蚀15秒。在37℃蒸馏水中储存24小时后，使用英斯特朗万能材料试验机以10毫米/分钟的十字头速度测量剪切脱粘力。与酸蚀牙釉质相比，粘结在喷砂牙釉质上的托槽平均剪切脱粘力显著更低（P<0.001）。威布尔分析表明，在给定应力下，粘结在喷砂牙釉质上的托槽失败概率显著更高。粘结在酸蚀牙釉质上的托槽显示出混合粘结失败模式，而喷砂处理后，失败发生在牙釉质/复合材料界面，为粘结性失败（P<0.01）。
