The effect of early static loading on the in vitro shear/peel bond strength of a 'no-mix' orthodontic adhesive.
The effect of early static loading on the in vitro shear/peel bond strength of a 'no-mix' orthodontic adhesive.
复制标题
早期静态加载对“非混合”正畸粘合剂的体外剪切/剥离粘合强度的影响。
DOI：
10.1093/ejo/22.5.555
复制
发表时间：
2000
影响因子：
2.6
通讯作者：
D. Wood
中科院分区：
文献类型：
--
作者：
E. Ching;P. Cook;N. Bubb;D. Wood
这项研究解决了这个问题，是否剪切和拉伸载荷后15分钟施加的金属托槽粘接到牙釉质影响的剪切/剥离粘接强度的粘合剂。使用非混合化学固化粘合剂将90个标准0.022英寸不锈钢方丝弓前磨牙网背支架粘合到90颗牙齿上，这些牙齿以标准化方式制备。15分钟后，对三组30颗牙齿进行以下处理：不施加载荷、0.77 N（78 g）的拉伸静载荷和0.77 N的剪切静载荷。在37 ℃、100%相对湿度下储存14天后，使用安装在通用试验机上的专用夹具测量粘合剂粘合的剪切/剥离强度。使用威布尔统计分析剪切/剥离粘合强度。三组的威布尔模量表明，尽管有早期静态载荷，粘合剂的性能仍然一致。对照组、拉伸组和剪切组的特征强度分别为9.22、9.27和9.05 MPa。研究结果表明，静态载荷（如绑在弓丝）可以放置在托槽上15分钟后，骨水泥，没有临床显着降低测试粘合剂的粘结强度。
This study addressed the question of whether shear and tensile loads applied 15 minutes after bonding metal brackets to enamel affected the shear/peel bond strength of the adhesive. Ninety standard 0.022-inch stainless steel edgewise premolar mesh-backed brackets were bonded using a no-mix chemical-cured adhesive to 90 teeth, which had been prepared in a standardized manner. After 15 minutes three groups of 30 teeth were subjected to the following regimes: no applied load, tensile static load of 0.77 N (78 g), and shear static load of 0.77 N. After 14 days storage in 100 per cent relative humidity at 37 degrees C, the shear/peel strength of the adhesive bond was measured using a purpose built jig mounted on a universal testing machine. Shear/peel bond strengths were analysed using Weibull statistics. The Weibull moduli of the three groups indicated that the adhesive performed consistently despite early static loading. Characteristic strengths were 9.22, 9.27, and 9.05 MPa for the control, tensile, and shear groups, respectively. The findings indicate that static loads (such as tying in of archwires) can be placed on brackets 15 minutes after cementation, without a clinically significant reduction in bond strength of the tested adhesive.