Damon P L, Bishara S E, Olsen M E, Jakobsen J R
College of Dentistry, University of Iowa, Iowa City 52242, USA.
Angle Orthod. 1996;66(1):61-4. doi: 10.1043/0003-3219(1996)066<0061:EOFAOS>2.3.CO;2.
The purpose of this study was to determine the shear bond strength and debonding failure modes of orthodontic brackets bonded to teeth that have been treated with various fluoride concentrations. Thirty-six recently extracted human premolars were divided into three groups: prophylaxis with pumice only, prophylaxis using a 13,500 ppm fluoridated pumice, and prophylaxis with pumice followed by application of a 2500 ppm fluoridated paste. The teeth were etched with a 37% phosphoric acid gel, then bonded with a metal orthodontic bracket. The teeth were mounted in phenolic rings and stored in de-ionized water at 37 degrees C for 72 hours. A Zwick Universal Testing Machine was used to determine shear bond strengths. The residual adhesive on the enamel surface was estimated using the Adhesive Remnant Index. Analysis of variance was used to compare the various groups, and significance was predetermined at p < or = 0.5. The results indicate that there were no significant differences in bond strengths between the treated and untreated teeth (p = .233). The Chi Square test evaluating the residual adhesive on the enamel surfaces also showed no significant differences (p =.456). In conclusion, the use of fluoridated prophylactic pastes with varying fluoride concentrations does not significantly affect shear bond strength or bond failure location.
本研究的目的是确定粘结到经不同氟化物浓度处理的牙齿上的正畸托槽的剪切粘结强度和脱粘失败模式。三十六颗近期拔除的人类前磨牙被分为三组：仅用浮石进行预防性清洁、使用含13500 ppm氟化物的浮石进行预防性清洁、先用浮石进行预防性清洁然后再涂抹含2500 ppm氟化物的糊剂。牙齿用37%的磷酸凝胶蚀刻，然后用金属正畸托槽粘结。将牙齿安装在酚醛环中，并在37摄氏度的去离子水中储存72小时。使用Zwick万能试验机测定剪切粘结强度。使用粘结剂残留指数评估釉质表面的残留粘结剂。采用方差分析比较各组，显著性预先设定为p≤0.5。结果表明，处理过的牙齿和未处理的牙齿之间的粘结强度没有显著差异（p = 0.233）。评估釉质表面残留粘结剂的卡方检验也显示没有显著差异（p = 0.456）。总之，使用不同氟化物浓度的含氟预防性糊剂不会显著影响剪切粘结强度或粘结失败位置。
