Jahanbin Arezoo, Ameri Hamideh, Khaleghimoghaddam Rokhsareh
Department of Orthodontics, Mashhad Dental School Research Center, Mashhad University of Medical Sciences, Iran.
Aust Orthod J. 2009 May;25(1):19-23.
Unsightly colour changes may occur in the enamel around bonded orthodontic brackets.
To determine the enamel colour changes around orthodontic brackets bonded with different adhesives.
One hundred extracted upper first premolars were divided into five equal groups. Fiducial holes were drilled in the buccal and palatal surfaces of the teeth and metal orthodontic brackets were bonded to the buccal surfaces with different combinations of adhesives and primers. The teeth were immersed in a tea-coffee solution for one week. The brackets were then debonded and the teeth polished. The colour of the enamel surface was measured around each fiducial hole before bonding (baseline), after debonding and after polishing. The colour differences (deltaE) were compared using one-way ANOVA and the paired t-test.
There were no significant differences between the five adhesive groups in baseline-debonding deltaE and baseline-polishing deltaE, but statistically significant differences were found between the baseline-debonding deltaE on the buccal and palatal surfaces and the baseline-debonding deltaE versus baseline-polishing deltaE on the buccal surfaces. Although statistically significant, the colour changes would not be visible to many observers. Approximately 75 per cent of the staining was attributed to the enamel components.
The type of adhesive and the methods of application had no effect on enamel colour change. Most of the colour change was attributed to uptake of stain by the components of the enamel, not the resin tags.
正畸粘结托槽周围的牙釉质可能会出现不雅观的颜色变化。
确定用不同粘结剂粘结正畸托槽周围的牙釉质颜色变化。
将100颗拔除的上颌第一前磨牙平均分为五组。在牙齿的颊面和腭面钻出基准孔，并用不同的粘结剂和底漆组合将金属正畸托槽粘结到颊面上。将牙齿浸泡在茶 - 咖啡溶液中一周。然后取下托槽并对牙齿进行抛光。在粘结前（基线）、取下托槽后和抛光后测量每个基准孔周围牙釉质表面的颜色。使用单因素方差分析和配对t检验比较颜色差异（ΔE）。
五个粘结剂组在基线 - 取下托槽的ΔE和基线 - 抛光的ΔE之间没有显著差异，但在颊面和腭面的基线 - 取下托槽的ΔE以及颊面的基线 - 取下托槽的ΔE与基线 - 抛光的ΔE之间发现了统计学上的显著差异。虽然具有统计学意义，但许多观察者可能看不到颜色变化。大约75%的染色归因于牙釉质成分。
粘结剂的类型和应用方法对牙釉质颜色变化没有影响。大部分颜色变化归因于牙釉质成分对污渍的吸收，而不是树脂突。
