Damon P L, Bishara S E, Olsen M E, Jakobsen J R
University of Iowa, College of Dentistry, Iowa City 52242-1001, USA.
Angle Orthod. 1997;67(3):169-72. doi: 10.1043/0003-3219(1997)067<0169:BSFTAO>2.3.CO;2.
The purpose of this study was to determine whether the application of chlorhexidine to etched enamel affects the shear bond strength and bracket/adhesive failure modes of orthodontic brackets. Forty recently extracted third molars were cleaned divided into two groups of twenty. The first group was etched with a 37% phosphoric acid gel, and a sealant was applied containing a chlorhexidine varnish. Stainless steel orthodontic brackets were bonded using the Transbond XT bonding system (3M/Unitek). Teeth in the second group were etched and bonded using the same bonding system but without chlorhexidine. A Zwick Universal Testing Machine was used to determine shear bond strengths. There were no significant differences in bond strengths between the chlorhexidine treated teeth (= 11.8 +/- 2.1 MPa) and the controls (= 12.4 +/- 3.1 MPa) (p = 0.129). The Chi Square test evaluating the residual adhesive on the enamel surfaces showed no significant differences (P = 0.136) between the two groups evaluated. The use of a primer containing chlorhexidine does not significantly affect shear bond strength nor the fracture site (bond failure location).
本研究的目的是确定将洗必泰应用于酸蚀后的牙釉质是否会影响正畸托槽的剪切粘结强度以及托槽/粘结剂的失效模式。40颗近期拔除的第三磨牙经清洁后分为两组，每组20颗。第一组用37%的磷酸凝胶进行酸蚀，并应用含洗必泰清漆的封闭剂。使用Transbond XT粘结系统（3M/Unitek）粘结不锈钢正畸托槽。第二组牙齿用相同的粘结系统进行酸蚀和粘结，但不使用洗必泰。使用Zwick万能试验机测定剪切粘结强度。经洗必泰处理的牙齿（=11.8±2.1MPa）与对照组（=12.4±3.1MPa）之间的粘结强度无显著差异（p=0.129）。评估牙釉质表面残留粘结剂的卡方检验显示，两组之间无显著差异（P=0.136）。使用含洗必泰的底漆不会显著影响剪切粘结强度，也不会影响断裂部位（粘结失效位置）。
