Department of Orthodontics, School of Dental Medicine, Saint Joseph University, Beirut, Lebanon.
Department of Orthodontics, School of Dental Medicine, Saint Joseph University, Beirut, Lebanon.
Int Orthod. 2021 Sep;19(3):505-511. doi: 10.1016/j.ortho.2021.05.002. Epub 2021 Jun 8.
The aim of this in vitro study was to evaluate the effects of enamel deproteinization on the shear bond strength of a self-etching primer Transbond Plus™(TBP), with different application times of sodium hypochlorite (NaOCl 5.25%), primarily and secondarily on the adhesive remnant index score.
One hundred twenty-five freshly extracted human premolars were randomly and blindly divided into five groups according to the enamel surface preparation, as follows (n=25): group 1(control): Etching with 37% phosphoric acid for 15seconds+Bonding; group 2 (control): TBP™ without NaOCl, group 3: 60seconds NaOCl+TBP™, group 4: 30seconds NaOCl+TBP™, group 5: 15seconds NaOCl+TBP™. The same composite resin was used (Transbond XT™) to bond the orthodontic metal brackets. After the immersion of the teeth in distilled water at 37°C for 24hours the shear bond strength was measured using the universal testing machine and the adhesive remnant index score (ARI) was evaluated under an optical microscope (25×).
The mean SBS values (inMPa) of the groups were respectively: group 1: 13.03±5.36; group 2: 12.28±3.06; group 3: 12.38±4.55; group 4: 12.98±5.76; and group 5: 11.73±5.67. Enamel deproteinization increased the SBS for groups 3 and 4, but no statistically significant difference was found between the five groups (P=0.883). Group 1 showed the highest ARI scores, with 52% of the teeth retaining all the adhesive (score 3). However, for all the other groups, scores 0 and 1 were predominant, with less than half of the adhesive or no adhesive at all remaining on the teeth.
Enamel deproteinization with sodium hypochlorite (5.25%) and the variation of its application time has no effect on the SBS of the self-etching primer Transbond Plus ™.
本体外研究旨在评估牙釉质脱蛋白对自酸蚀底漆 Transbond Plus™（TBP）的剪切粘结强度的影响，研究不同次氯酸钠（NaOCl5.25%）应用时间对粘结残余指数评分的主要和次要影响。
125 颗新鲜人切牙随机分为 5 组，根据牙釉质表面处理情况，每组 25 颗，如下：（n=25）：组 1（对照组）：磷酸 37%酸蚀 15s+粘结；组 2（对照组）：TBP™无 NaOCl；组 3：60s NaOCl+TBP™；组 4：30s NaOCl+TBP™；组 5：15s NaOCl+TBP™。相同的复合树脂（Transbond XT™）用于粘结正畸金属托槽。将牙齿浸入 37°C 的蒸馏水中 24 小时后，使用万能试验机测量剪切粘结强度，在光学显微镜（25×）下评估粘结残余指数评分（ARI）。
各组的平均 SBS 值（MPa）分别为：组 1：13.03±5.36；组 2：12.28±3.06；组 3：12.38±4.55；组 4：12.98±5.76；组 5：11.73±5.67。牙釉质脱蛋白增加了组 3 和组 4 的 SBS，但 5 组之间无统计学差异（P=0.883）。组 1 显示出最高的 ARI 评分，52%的牙齿保留了所有粘结剂（评分 3）。然而，对于所有其他组，评分 0 和 1 占主导地位，牙齿上残留的粘结剂不到一半或根本没有粘结剂。
用次氯酸钠（5.25%）对牙釉质进行脱蛋白处理以及改变其应用时间对自酸蚀底漆 Transbond Plus™的 SBS 没有影响。
