Dragomirescu Anca-Oana, Bencze Maria-Angelica, Vasilache Adriana, Teodorescu Elina, Albu Cristina-Crenguța, Popoviciu Nicoleta Olivia, Ionescu Ecaterina
Department of Orthodontics and Dentofacial Orthopaedics, Faculty of Dental Medicine, "Carol Davila" University of Medicine and Pharmacy, 020021 Bucharest, Romania.
Department of Genetics, Faculty of Dental Medicine, "Carol Davila" University of Medicine and Pharmacy, 020021 Bucharest, Romania.
Materials (Basel). 2022 Apr 3;15(7):2640. doi: 10.3390/ma15072640.
(1) Background: Orthodontic appliances have changed and improved with the increasing demand for orthodontic treatment of the general population. Patients desire for shorter orthodontic treatments and for the wearing of more aesthetic devices has led to the technological development of orthodontic brackets; these were manufactured from aesthetic materials (ceramics, composite polymers) and presented different designs regarding the way archwires are ligated to the bracket. The aim of this study was to determine whether there were any differences between the static frictional forces generated by stainless steel (metallic) and polycrystalline alumina (ceramics) conventional and self-ligating brackets. (2) Methods: Static friction assessment was carried out in vitro with a universal testing machine, HV-500N-S (Schmidt Control Instruments, Hans Schmidt & Co. GmbH), intended for measuring compression and traction forces. (3) Results: The study revealed significant differences in static frictional forces at the bracket-archwire interface between the tested brackets. Stainless steel brackets produced lower static friction forces than polycrystalline alumina and self-ligating brackets generally produced lower static frictional forces than conventional brackets. The reduction of frictional forces was noticeable in the first stages of treatment, when thin, flexible orthodontic archwires (0.016" NiTi) are used. Engaged with large rectangular stainless steel archwires, (0.019 × 0.025" SS), the frictional forces produced by conventional and self-ligating metal brackets were similar, no significant differences being observed between the two types of metallic design. However, in the case of tested ceramic brackets, the results showed that the self-ligating type allows a reduction in frictional forces even in advanced stages of treatment compared to conventionally ligation. (4) Conclusions: From the perspective of an orthodontic system with low frictional forces, metal brackets are preferable to aesthetic ones, and self-ligating ceramic brackets are preferable to conventional ceramic brackets.
(1) 背景：随着普通人群对正畸治疗需求的增加，正畸矫治器不断变化和改进。患者对缩短正畸治疗时间以及佩戴更美观矫治器的需求推动了正畸托槽的技术发展；这些托槽由美观材料（陶瓷、复合聚合物）制成，并在弓丝结扎到托槽的方式上呈现出不同设计。本研究的目的是确定不锈钢（金属）和多晶氧化铝（陶瓷）传统及自锁托槽产生的静摩擦力之间是否存在差异。(2) 方法：使用一台用于测量压缩和牵引力的万能试验机HV - 500N - S（施密特控制仪器公司，汉斯·施密特有限公司）在体外进行静摩擦评估。(3) 结果：研究显示，测试托槽在托槽 - 弓丝界面处的静摩擦力存在显著差异。不锈钢托槽产生的静摩擦力低于多晶氧化铝托槽，自锁托槽通常比传统托槽产生的静摩擦力更低。在治疗的初始阶段，当使用细的、柔性正畸弓丝（0.016英寸镍钛丝）时，摩擦力的降低很明显。当与大的矩形不锈钢弓丝（0.019×0.025英寸不锈钢丝）配合使用时，传统和自锁金属托槽产生的摩擦力相似，两种金属设计之间未观察到显著差异。然而，对于测试的陶瓷托槽，结果表明，与传统结扎相比，自锁型即使在治疗后期也能降低摩擦力。(4) 结论：从低摩擦力正畸系统的角度来看，金属托槽优于美观托槽，自锁陶瓷托槽优于传统陶瓷托槽。
