Department of Orthodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, Shenyang, 110002, China.
Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Ibb University, Ibb, Republic of Yemen.
BMC Oral Health. 2023 Feb 19;23(1):113. doi: 10.1186/s12903-023-02812-7.
In orthodontic treatment, closing spaces, specifically the extraction and scattered spaces of the anterior teeth, requires some auxiliary bias, such as an elastomeric chain. Many factors affect the mechanical properties of elastic chains. In this study, we investigated the relationship of the filament type, the number of loops, and the force degradation of elastomeric chains under thermal cycling conditions.
The orthogonal design included three filament types (i.e., close, medium, and long). Four, five, and six loops of each elastomeric chain were stretched to have an initial force of 250 g in an artificial saliva environment at 37 °C and thermocycling between 5 and 55 °C three times a day. The remaining force of the elastomeric chains was recorded at different time points (4 h, 24 h, 7 days, 14 days, 21 days, and 28 days), and the percentage of the remaining force was calculated.
The force decreased significantly in the initial 4 h and degraded mostly within the first 24 h. In addition, the percentage of force degradation increased slightly between 1 and 28 days.
Under the same initial force, the longer the connecting body is, the fewer the number of loops and the greater the force degradation of the elastomeric chain are.
在正畸治疗中，关闭间隙，特别是前牙的拔牙间隙和散在间隙，需要一些辅助偏斜力，如弹性链。许多因素会影响弹性链的力学性能。在本研究中，我们研究了在热循环条件下，丝的类型、环的数量和弹性链的力衰减之间的关系。
正交设计包括三种丝的类型（即短、中、长）。将每个弹性链的四、五和六个环拉伸至 250 g 的初始力，在 37°C 的人工唾液环境中，每天进行三次 5 到 55°C 的热循环。在不同的时间点（4 小时、24 小时、7 天、14 天、21 天和 28 天）记录弹性链的剩余力，并计算剩余力的百分比。
在最初的 4 小时内，力明显下降，并且在最初的 24 小时内大部分降解。此外，在 1 到 28 天之间，力降解的百分比略有增加。
在相同的初始力下，连接体越长，环的数量越少，弹性链的力衰减越大。
