Sökücü Oral, Yeşildal Seher, Okşayan Rıdvan, Şimşek İrfan
Department of Orthodontics, Gaziantep University School of Dentistry, Gaziantep, Turkey.
Department of Prosthodontics, Gaziantep University School of Dentistry, Gaziantep, Turkey.
Turk J Orthod. 2016 Mar;29(1):6-9. doi: 10.5152/TurkJOrthod.2016.15-00009R1. Epub 2016 Mar 1.
The purpose of this study was to observe two different seating forces on conventional and self-ligating brackets using shear bond strength (SBS).
The study material consisted of 48 recently extracted human premolars divided into four groups: Group I, conventional bracket (Master series, AO) 100 g seating force applied; Group II, conventional bracket (Master series, AO) 200 g seating force applied; Group III, self-ligating bracket (Empower, AO) 100 g seating force applied; and Group IV, self-ligating bracket (Empower, AO) 200 g seating force applied. All teeth were bonded with Transbond XT by the same operator. Following the bonding procedure, all teeth were stored in deionized water at 37°C for 30 days, and they were thermal cycled. A universal testing machine was used to obtain the SBS records. The Kruskal-Wallis statistical test was used to determine the significant differences in SBS between the four groups, and the Mann-Whitney U test with Bonferroni correction was used to compare the subgroups.
The mean shear bond strength was 15.70 MPa for Group I, 13.97 MPa for Group II, 8.38 MPa for Group III, and 8.31 MPa for Group IV. Significant differences in the SBS values were recorded between the self-ligating groups and conventional bracket groups. Seating forces on the brackets did not show any differences among the groups.
Within the limitations in this study, 100 g and 200 g forces can be applied because both seating forces showed acceptable SBS results.
本研究旨在使用剪切粘结强度（SBS）观察常规托槽和自锁托槽上两种不同的就位力。
研究材料包括48颗近期拔除的人类前磨牙，分为四组：第一组，应用100g就位力的常规托槽（Master系列，AO）；第二组，应用200g就位力的常规托槽（Master系列，AO）；第三组，应用100g就位力的自锁托槽（Empower，AO）；第四组，应用200g就位力的自锁托槽（Empower，AO）。所有牙齿均由同一名操作者使用Transbond XT粘结。粘结程序完成后，所有牙齿在37℃的去离子水中储存30天，并进行热循环处理。使用万能试验机获取SBS记录。采用Kruskal-Wallis统计检验确定四组之间SBS的显著差异，并使用经Bonferroni校正的Mann-Whitney U检验比较亚组。
第一组的平均剪切粘结强度为15.70MPa，第二组为13.97MPa，第三组为8.38MPa，第四组为8.31MPa。自锁托槽组和常规托槽组之间的SBS值存在显著差异。托槽上的就位力在各组之间未显示出任何差异。
在本研究的局限性范围内，可以施加100g和200g的力，因为两种就位力均显示出可接受的SBS结果。
