Eminkahyagil Neslihan, Arman Ayca, Cetinşahin Alev, Karabulut Erdem
Department of Conservative Dentistry, Baskent University, Bahcelievler 06490, Ankara, Turkey.
Angle Orthod. 2006 Mar;76(2):314-21. doi: 10.1043/0003-3219(2006)076[0314:EORMOE]2.0.CO;2.
The objective of this study is to determine (1) the effect of different resin-removal methods on shear bond strength (SBS) of rebonded brackets, (2) condition of the enamel surface, (3) time spent to remove resin remnants, and (4) the location of the bond failure. A total of 80 premolars were included in the study. Fifty of them were divided into five groups and bonded using Light Bondtrade mark sealant and Quick Curetrade mark adhesive. Ten of the samples were debonded, and the SBS of the first debonding was calculated. Forty brackets were debonded using pliers and examined by an optical microscope (16x) to determine the location of the bond failure interface, using a modified Adhesive Remnant Index (ARI). The remnant adhesives were cleaned with four methods: (1) low-speed tungsten-carbide bur (TCB), (2) high-speed TCB, (3) Sof-Lex finishing disks, and (4) microetcher. The brackets were rebonded, and a second set of SBS and ARI values were calculated and statistically evaluated. Thirty of the premolars were divided into five groups receiving the same resin-removal methods and examined by scanning electron microscope. Rebonded teeth had a greater SBS than the initial bonding, except in group 4. The rebonded SBS values were similar in groups 1-3, and only group 4 showed a statistical difference. Sof-lex discs were the most time-consuming procedures and left much adhesive remnant. The high-speed TCB was found to be the most hazardous to the enamel. The scarring of enamel after the debonding is inevitable but can be reduced.
（1）不同树脂去除方法对重新粘结托槽剪切粘结强度（SBS）的影响；（2）釉质表面状况；（3）去除树脂残余物所花费的时间；（4）粘结失败的位置。本研究共纳入80颗前磨牙。其中50颗被分为五组，使用Light Bond商标封闭剂和Quick Cure商标粘合剂进行粘结。其中10个样本进行脱粘，并计算首次脱粘的SBS。使用钳子将40个托槽脱粘，并通过光学显微镜（16倍）检查，以使用改良的粘结剂残余指数（ARI）确定粘结失败界面的位置。使用四种方法清洁残余粘结剂：（1）低速碳化钨车针（TCB）；（2）高速TCB；（3）Sof-Lex抛光盘；（4）微蚀刻器。将托槽重新粘结，并计算第二组SBS和ARI值并进行统计学评估。30颗前磨牙被分为五组，采用相同的树脂去除方法，并通过扫描电子显微镜检查。除第4组外，重新粘结的牙齿的SBS高于初次粘结。第1-3组重新粘结的SBS值相似，只有第4组有统计学差异。Sof-lex盘是最耗时的操作，且会留下大量粘结剂残余物。发现高速TCB对釉质危害最大。脱粘后釉质的瘢痕形成是不可避免的，但可以减少。
