Sessa Tijana, Civović Jelena, Pajević Tina, Juloski Jovana, Beloica Milos, Pavlović Vladimir, Glisić Branislav
Clinic of Orthodontics, Faculty of Dental Medicine, University of Belgrade, Belgrade, Serbia.
Srp Arh Celok Lek. 2012 Jan-Feb;140(1-2):22-8.
Therapy with fixed orthodontic appliances starts with bracket bonding and ends with debonding of brackets, leaving enamel surface varied. Objective The aim of this pilot study was to examine enamel surface before and after debonding of orthodontic brackets by the use of scanning electron microscopy (SEM).
Epoxy replicas of four patients' premolars indicated for therapy with fixed orthodontic appliances were made and brackets were bonded to their teeth with a different adhesives (Enlight, No-mix, Fuji Ortho LC and Heliosit Orthodontic) (n=4).Two months later, brackets on premolars were debonded and amounts of adhesive left on the tooth surfaces and the bracket bases were evaluated with the adhesive remnant index (ARI). After resin removal, epoxy replicas were made and the surface of premolars was evaluated with the enamel surface index (ESI). All replicas of premolars (n=32) were prepared for SEM examination and compared under different magnifications. Tooth damage was estimated based on correlation between ARItooth and ESI.
Pearson's chi2 test showed no significant differences between ARItooth and ARIbracket of four materials used. Nonparametric correlations showed significant differences between ARItooth and ARIbracket, ESI and ARItooth, and between ESI and ARIbracket. Increasing of ARItooth is followed with the descent of ARIbracket and the ascent of ESI. Multivariate regression analysis showed a significant correlation between ESI and ARItooth.
Most bond failures took place at enamel-adhesive interface. ARItooth was a predictor to enamel surface damage. The type of material did not affect enamel surface damage.
固定正畸矫治器治疗始于托槽粘结，结束于托槽拆除，这会使牙釉质表面呈现出不同变化。目的：本初步研究旨在通过扫描电子显微镜（SEM）检查正畸托槽拆除前后的牙釉质表面。
制作了4例准备接受固定正畸矫治器治疗患者的前磨牙的环氧树脂复制品，并用不同的粘结剂（Enlight、No-mix、Fuji Ortho LC和Heliosit Orthodontic）将托槽粘结到他们的牙齿上（n = 4）。两个月后，拆除前磨牙上的托槽，用粘结剂残留指数（ARI）评估留在牙齿表面和托槽基底上的粘结剂数量。去除树脂后，制作环氧树脂复制品，并用牙釉质表面指数（ESI）评估前磨牙的表面。所有前磨牙的复制品（n = 32）都准备进行SEM检查，并在不同放大倍数下进行比较。根据ARI牙齿与ESI之间的相关性估计牙齿损伤情况。
Pearson卡方检验显示，所使用的四种材料的ARI牙齿与ARI托槽之间无显著差异。非参数相关性显示，ARI牙齿与ARI托槽、ESI与ARI牙齿以及ESI与ARI托槽之间存在显著差异。ARI牙齿增加伴随着ARI托槽下降和ESI上升。多变量回归分析显示ESI与ARI牙齿之间存在显著相关性。
大多数粘结失败发生在牙釉质 - 粘结剂界面。ARI牙齿是牙釉质表面损伤的一个预测指标。材料类型不影响牙釉质表面损伤。
