Baidas Laila, Al-Rasheed Noura, Murad Rufaidah, Ibrahim Mohamed A
Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, Riyadh, Kingdom of Saudi Arabia, Phone: +966-1-8055724, e-mail:
College of Dentistry, King Saud University, Riyadh, Kingdom of Saudi Arabia.
J Contemp Dent Pract. 2020 Feb 1;21(2):140-147.
The aim of this study was to evaluate the effects of different concentrations of sodium ascorbate (SA), green tea (GT), and chamomile (CM) on the shear bond strength (SBS) of metal orthodontic brackets bonded to teeth bleached with 40% hydrogen peroxide (HP).
Ninety-four sound premolars were divided into eight groups: group I (control + no bleaching), group II (bleaching + immediate bonding), group III (bleaching + 10% SA), group IV (bleaching + 35% SA), group V (bleaching + 0.5% GT), group VI (bleaching + 1% GT), group VII (bleaching + 0.5% CM), and group VIII (bleaching + 1% CM). In groups III-VIII, teeth were treated with the antioxidants for 10 minutes after bleaching with 40% HP, but before bonding. All the specimens were bonded with the resilience adhesive, and the SBS was tested with a universal testing machine (Instron 5965). The cross-head speed to break the bond was 1 mm/minute. The adhesive remnant index (ARI) was tested under 50× magnification. One-way analysis of variance, Tukey's , and Chi-squared tests were used for analysis ( ≤ 0.05).
The differences in SBS among the eight tested groups were highly significant ( 0.001). Comparison of the eight groups using Tukey's test revealed significantly lower SBS ( 0.001) in test groups II, III, IV, and VIII than in group I. Adhesive remnant index scores showed significant intergroup differences ( = 0.005). Most groups had a failure score of 1 (<50% of the bonding material adhering to the tooth), whereas groups II and VIII showed a failure score of 0 (no material adhering to the tooth).
Bond strength can be enhanced by using 0.5% or 1% GT or 0.5% CM to allow bracket bonding immediately after bleaching.
The use of antioxidants would allow clinicians to bleach teeth before orthodontic treatment without delaying bonding.
本研究旨在评估不同浓度的抗坏血酸钠（SA）、绿茶（GT）和洋甘菊（CM）对用40%过氧化氢（HP）漂白后的牙齿上粘结金属正畸托槽的剪切粘结强度（SBS）的影响。
94颗健康前磨牙分为八组：第一组（对照+未漂白），第二组（漂白+立即粘结），第三组（漂白+10%SA），第四组（漂白+35%SA），第五组（漂白+0.5%GT），第六组（漂白+1%GT），第七组（漂白+0.5%CM），第八组（漂白+1%CM）。在第三至八组中，牙齿在用40%HP漂白后、粘结前用抗氧化剂处理10分钟。所有标本均用弹性粘结剂粘结，并用万能试验机（Instron 5965）测试SBS。破坏粘结的十字头速度为1毫米/分钟。在50倍放大倍数下测试粘结剂残留指数（ARI）。采用单因素方差分析、Tukey检验和卡方检验进行分析（P≤0.05）。
八个测试组之间的SBS差异具有高度显著性（P<0.001）。使用Tukey检验对八组进行比较，结果显示测试组II、III、IV和VIII的SBS显著低于第一组（P<0.001）。粘结剂残留指数评分显示组间差异显著（P = 0.005）。大多数组的失败评分为1（<50%的粘结材料附着在牙齿上），而组II和VIII的失败评分为0（无材料附着在牙齿上）。
使用0.5%或1%的GT或0.5%的CM可提高粘结强度，使漂白后立即进行托槽粘结。
抗氧化剂的使用将使临床医生能够在正畸治疗前漂白牙齿，而不会延迟粘结。
