Orthodontic Teaching Unit, University of Murcia, Murcia, Spain.
Med Oral Patol Oral Cir Bucal. 2010 Sep 1;15(5):e820-6. doi: 10.4317/medoral.15.e820.
To evaluate the shear bond strength and site of failure of brackets bonded to dry and wet enamel.
50 teeth were divided into ten groups of 5 teeth each (10 surfaces). In half the groups enamel was kept dry before bonding, and in the other half distilled water was applied to wet the surface after etching. The following groups were established: 1) Acid/Transbond-XT (dry/wet) XT; 2) Transbond Plus Self Etching Primer (TSEP)/Transbond-XT paste (dry/wet); 3) Concise (dry), Transbond MIP/Concise (wet), 4) FujiOrtho-LC (dry/wet); 5) SmartBond (dry/wet). Brackets were bonded to both buccal and lingual surfaces. Specimens were stored in distilled water (24 hours at 37 degrees C) and thermocycled. Brackets were debonded using a Universal testing machine (cross-head speed 1 mm/min). Failure sites were classified using a stereomicroscope.
No significant differences in bond strength were detected between the adhesives under wet and dry conditions except for SmartBond, whose bond strength was significantly lower under dry conditions. For all the adhesives most bond failures were of mixed site location except for Smartbond, which failed at the adhesive-bracket interface.
Under wet conditions the bonding capacity of the adhesives tested was similar than under dry conditions, with the exception of SmartBond which improved under wet conditions.
评估黏结于干燥和湿润牙釉质的托槽的抗剪黏结强度和失败部位。
50 颗牙被分为 10 组，每组 5 颗牙（10 个面）。一半牙面在黏结前保持干燥，另一半牙面经酸蚀后用蒸馏水润湿。建立以下分组：1）酸/Transbond-XT（干燥/湿润）XT；2）Transbond Plus 自酸蚀黏结剂（TSEP）/Transbond-XT 糊剂（干燥/湿润）；3）Concise（干燥），Transbond MIP/Concise（湿润），4）FujiOrtho-LC（干燥/湿润）；5）SmartBond（干燥/湿润）。托槽黏结于颊面和舌面。标本在蒸馏水中（37°C 储存 24 小时）并热循环。使用万能试验机（十字头速度 1mm/min）将托槽从牙面分离。使用体视显微镜对失败部位进行分类。
除 SmartBond 外，在干燥和湿润条件下，各黏结剂的黏结强度无显著差异，SmartBond 黏结强度在干燥条件下显著降低。除 SmartBond 外，所有黏结剂的大部分黏结失败均为混合部位，SmartBond 则在黏结剂-托槽界面处失败。
除 SmartBond 外，在湿润条件下，所测试黏结剂的黏结能力与干燥条件下相似，而 SmartBond 则在湿润条件下改善。
