Saeoweiang Pichanee, Chobpradit Pattraporn, Kulsing Chadin, Mahapoka Ekamon, Aonbangkhen Chanat, Charoenrat Thanit
Department of Orthodontics, Chulalongkorn University, 34 Henri-Dunant Road, Bangkok, 10330, Thailand.
Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.
BMC Oral Health. 2024 Jun 12;24(1):680. doi: 10.1186/s12903-024-04424-1.
To investigate the effect of a 50% ascorbic acid with 50% citric acid solution on the immediate shear bond strength (SBS) of metallic brackets after tooth bleaching. The enamel etching pattern and the required quantity of these combined acids as antioxidants following 35% hydrogen peroxide (HP) bleaching were also determined.
The stability of the solution at room temperature was assessed at various time intervals. Fifty teeth were randomly divided into five groups: non-bleached (G1), bleached then acid etched (G2), bleached followed by a 10-minute treatment with 10% sodium ascorbate and acid etched (G3), 5-minute treatment with 50% ascorbic acid (G4), and 5-minute treatment with a combination of 50% ascorbic acid and 50% citric acid (G5). Groups G2, G3, G4 and G5 were bleached by 35% HP gel for a total of 32 min. Acid etching in groups G1, G2, and G3 was performed using 37% phosphoric acid (Ormco®, Orange, CA, USA) for 15 s. In all groups, metal brackets were immediately bonded using Transbond™ XT primer and Transbond™ PLUS adhesive, with light curing for 40 s. The SBS was tested with a universal testing machine, and statistical analysis was conducted using one-way ANOVA followed by Tukey's HSD test. The level of significance was set at p < 0.05 for all statistical tests.
Stability tests demonstrated that the combined acids remained effective for up to 21 days. Group G5 significantly increased the SBS of bleached teeth to the level of G1 (p < 0.05), while G3 did not achieve the same increase in SBS (p > 0.05). SEM analysis revealed enamel etching patterns similar to those of both control groups (G1 and G2). Kinetic studies at 6 min indicated that the antioxidation in G5 reacted 0.2 mmole lower than in G3 and G4.
5-minute application of the combined acids enhanced the SBS of bleached teeth comparable to unbleached teeth. The combined acids remain stable over two weeks, presenting a time-efficient, single-step solution for antioxidant application and enamel etching in orthodontic bracket bonding.
探讨50%抗坏血酸与50%柠檬酸溶液对牙齿漂白后金属托槽即刻剪切粘结强度（SBS）的影响。同时还确定了在35%过氧化氢（HP）漂白后，这些混合酸作为抗氧化剂的釉质酸蚀模式及所需用量。
在不同时间间隔评估溶液在室温下的稳定性。将50颗牙齿随机分为五组：未漂白组（G1）、漂白后酸蚀组（G2）、漂白后用10%抗坏血酸钠处理10分钟再酸蚀组（G3）、用50%抗坏血酸处理5分钟组（G4）、用50%抗坏血酸与50%柠檬酸混合液处理5分钟组（G5）。G2、G3、G4和G5组用35% HP凝胶漂白共32分钟。G1、G2和G3组用37%磷酸（美国加利福尼亚州奥兰治市奥美科公司生产）酸蚀15秒。所有组均使用Transbond™ XT底漆和Transbond™ PLUS粘结剂立即粘结金属托槽，光照固化40秒。用万能试验机测试SBS，并采用单因素方差分析和Tukey's HSD检验进行统计分析。所有统计检验的显著性水平设定为p < 0.
