Vaheed Nishad A, Gupta Mukesh, David Sumitha A, Sam George, Ramanna Pavithra K, Bhagvandas Sudeep C
Department of Orthodontics and Dentofacial Orthopedics Noorul Islam College of Dental Science, Thiruvananthapuram Kerala, India, e-mail:
Department of Orthodontics and Dentofacial Orthopedics Index Institute of Dental Sciences, Indore, Madhya Pradesh India.
J Contemp Dent Pract. 2018 Sep 1;19(9):1047-1051.
This study aimed at evaluating and comparing the bond strength of stainless steel brackets bonded with multiple orthodontic adhesives.
About 60 premolars extracted to create space during orthodontic treatment were included in the present study. Premolar stainless steel brackets of size 0.022" slot with the surface area of bracket base of 11.15 mm were used. The premolars were divided randomly into three groups of 20 in each. Group I: Conventional Acid Etching (Transbond XT); group II: Seventh-generation adhesive materials (Xeno V); and group III: Flowable composite (Filtek Z350 XT). Calculation of Adhesive Remnant Index (ARI) was done and shear bond strength was assessed. The probability level of 0.05 was considered as clinically significant.
The shear bond strength was highest in group II (17.46 ± 1.36), which was followed by group I (15.33 ± 2.78) and the least was shown by group III (13.96 ± 1.44). A statistically significant difference was found between group I vs II, group II vs III, and group III vs II. Utmost prevalence of about 35% was found in Transbond XT with an ARI score of 3 (followed by all adhesive left on the tooth), Filtek Z350 XT with 20%, and the least was found with Xeno V, about 5%. The probability was found to be p = 0.025 among different groups, which is statistically significant according to chi-square test.
The study concluded that the adhesive materials of the seventh generation showed higher shear bond strength than that of the flowable composite and conventional acid etching. The ARI indicated that a minimum amount of the residual adhesive was found on the surface of the enamel after debonding.
This study helps orthodontists to select appropriate adhesive and orthodontic brackets for the benefit of the patient and to distinguish the distribution of stress homogeneously within the layer of cement while loading and subsequently minimizing the damage to the enamel during the debonding of orthodontic brackets.
本研究旨在评估和比较用多种正畸粘合剂粘结的不锈钢托槽的粘结强度。
本研究纳入了约60颗在正畸治疗期间为开辟间隙而拔除的前磨牙。使用的是槽沟尺寸为0.022英寸、托槽基底表面积为11.15平方毫米的前磨牙不锈钢托槽。将前磨牙随机分为三组，每组20颗。第一组：传统酸蚀法（Transbond XT）；第二组：第七代粘结材料（Xeno V）；第三组：可流动复合树脂（Filtek Z350 XT）。计算粘结剂残留指数（ARI）并评估剪切粘结强度。将0.05的概率水平视为具有临床意义。
第二组的剪切粘结强度最高（17.46±1.36），其次是第一组（15.33±2.78），第三组最低（13.96±1.44）。在第一组与第二组、第二组与第三组以及第三组与第二组之间发现了统计学上的显著差异。在Transbond XT中，ARI评分为3（即所有粘结剂都留在牙齿上）的情况最为普遍，约为35%；Filtek Z350 XT为20%；Xeno V最少，约为5%。根据卡方检验，不同组之间的概率为p = 0.025，具有统计学意义。
该研究得出结论，第七代粘结材料的剪切粘结强度高于可流动复合树脂和传统酸蚀法。ARI表明，脱粘后在釉质表面发现的残留粘结剂数量最少。
本研究有助于正畸医生为患者选择合适的粘结剂和正畸托槽，使粘结层内应力分布均匀，从而在正畸托槽脱粘过程中尽量减少对釉质的损伤。
