Rahul M, Kumar P Anil, Nair Amal S, Mathew Shino, Amaladas Antony Shijoy, Ommen Anna
Department of Orthodontics and Dentofacial Orthopedics, Sree Mookambika Institute of Dental Sciences, Kulasekaram, Kanyakumari, Tamil Nadu, India.
Indian J Dent Res. 2017 Sep-Oct;28(5):566-573. doi: 10.4103/ijdr.IJDR_13_17.
This study aimed to evaluate the effects of at-home and in-office bleaching on the shear bond strength (SBS) of metal, ceramic, and composite orthodontic brackets and to compare their SBSs.
A total of 96 human lower premolar teeth were used for this study. Six teeth were used for scanning electron microscopic study while the remaining ninety were divided into three equal groups. Each group was further subdivided into three subgroups with ten samples each. Three protocols were used. In the at-home bleaching group (n = 30), opalescence non-PF (potassium nitrate and fluoride) bleaching agent (10% carbamide peroxide) was applied onto the teeth daily for 14 days and left for 8 h each day. Teeth in the in-office group (n = 30) were treated twice in consecutive days with Opalescence boost PF (40% hydrogen peroxide). After bleaching, the specimens were stored in distilled water for 1 day before bonding. SBS testing was performed on all teeth using Instron universal testing machine.
Analysis of variance indicated a significant difference (P < 0.005) among the groups. Maximum SBS was shown by ceramic brackets in control group (Ib) and minimum was shown by composite brackets of in-office bleached group (IIIc).
The results showed that at-home bleaching did not affect the SBS significantly whereas in-office bleaching reduced SBS of metal, ceramic, and composite brackets significantly. It is preferable to use metal or ceramic brackets than composite brackets for bonding 24 h after bleaching.
本研究旨在评估家庭美白和诊室美白对金属、陶瓷及复合正畸托槽剪切粘结强度（SBS）的影响，并比较它们的SBS。
本研究共使用96颗人类下颌前磨牙。6颗牙齿用于扫描电子显微镜研究，其余90颗牙齿分为三组，每组再进一步细分为三个亚组，每组10个样本。采用了三种方案。家庭美白组（n=30），每天将非PF型皓齿美白剂（含硝酸钾和氟化物，10%的过氧化脲）涂于牙齿上，共14天，每天保持8小时。诊室美白组（n=30）连续两天使用PF型皓齿快速美白剂（40%的过氧化氢）进行治疗。美白后，标本在粘结前于蒸馏水中保存1天。使用Instron万能试验机对所有牙齿进行SBS测试。
方差分析表明各组间存在显著差异（P<0.005）。对照组（Ib）的陶瓷托槽显示出最大的SBS，而诊室美白组（IIIc）的复合托槽显示出最小的SBS。
结果表明，家庭美白对SBS无显著影响，而诊室美白显著降低了金属、陶瓷和复合托槽的SBS。漂白24小时后粘结时，使用金属或陶瓷托槽比复合托槽更可取。
