Santana R M, Rached R N, Souza E M, Guariza-Filho O, Camargo E S, Pithon M M, Tanaka O M
Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, Brazil.
Southwest Bahia State University - UESB, Bahia, Brazil.
Orthod Craniofac Res. 2016 Aug;19(3):137-44. doi: 10.1111/ocr.12121. Epub 2016 Feb 22.
To evaluate the effect of organic gel solvents (70% acetone and 90% ethanol) and ultrasound in the removal of metallic brackets.
Metallic brackets were bonded with light-cured orthodontic composite (Transbond XT) in 120 human bicuspids and divided into 6 groups for the enamel etch-and-rinse adhesive system (XT) and 6 groups to self-etching system (SEPT) according to pretreatment to removal test: control, 70% acetone, 90% ethanol, ultrasound, 70% acetone+ultrasound, and 90% ethanol+ultrasound. The brackets were subjected to removal by shear testing and Adhesive Remnant Index (ARI) evaluation. Some specimens were prepared and its adhesive interface and etching ability observed by scanning electron microscopy (SEM).
Only the factor 'ultrasound' and its interaction with 'adhesive' were detected as a source of variance, with the SEPT/ultrasound showing the lowest shear strength than the other groups. Regardless the factor 'ultrasound', XT showed a higher ARI than SEPT; however, when the solvents were used, no differences were detected between XT and SEPT.
The organic solvents were not effective in reducing shear bond strength. The etch-and-rinse adhesive system showed a higher and more favorable ARI score than the self-etching primer. The behavior of the organic solvents on ARI showed to be better when associated with the self-etching primer. The ultrasound was effective in reducing the shear bond strength of the self-etching adhesive system but not in affecting the ARI of the adhesive systems.
评估有机凝胶溶剂（70%丙酮和90%乙醇）及超声在去除金属托槽方面的效果。
在120颗人类双尖牙上用光固化正畸复合材料（Transbond XT）粘结金属托槽，根据去除测试的预处理方法分为6组用于釉质酸蚀冲洗粘结系统（XT）和6组用于自酸蚀系统（SEPT）：对照组、70%丙酮组、90%乙醇组、超声组、70%丙酮+超声组和90%乙醇+超声组。通过剪切测试和粘结剂残留指数（ARI）评估来去除托槽。制备一些标本，并用扫描电子显微镜（SEM）观察其粘结界面和酸蚀能力。
仅检测到“超声”因素及其与“粘结剂”的相互作用为方差来源，SEPT/超声组的剪切强度低于其他组。无论“超声”因素如何，XT组的ARI均高于SEPT组；然而，使用溶剂时，XT组和SEPT组之间未检测到差异。
有机溶剂在降低剪切粘结强度方面无效。酸蚀冲洗粘结系统的ARI评分高于自酸蚀底漆，且更有利。有机溶剂与自酸蚀底漆联合使用时，对ARI的影响表现更好。超声可有效降低自酸蚀粘结系统的剪切粘结强度，但不影响粘结系统的ARI。
