Effects of time and clear aligner removal frequency on the force delivered by different polyethylene terephthalate glycol-modified materials determined with thin-film pressure sensors
Effects of time and clear aligner removal frequency on the force delivered by different polyethylene terephthalate glycol-modified materials determined with thin-film pressure sensors
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DOI：
10.1016/j.ajodo.2018.03.017
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发表时间：
2019-01-01
影响因子：
3
通讯作者：
Iddi, Iddi
中科院分区：
文献类型：
--
作者：
Skaik, Adham;Wei, Xiao Li;Iddi, Iddi
引言：许多因素影响透明矫治器的力变化。本研究的目的是确定影响聚对苯二甲酸乙二醇酯（PET-G）材料产生的力变化的各种因素。为此，建立了一种基于柔性薄膜压力传感器的力测量系统。研究方法：设计并制作了一系列具有两种材料特性和不同激活方式的上颌中切牙、上颌第二前磨牙和上颌第一恒磨牙的透明矫治器。第一种材料是传统的PET-G;第二种材料是具有更高弹性模量和更高耐磨性的改性PET-G。生产了几个模型，包括牙齿和矫正器。然后，力变化检测装置，包括薄膜压力传感器，信号采集电路板，和一台计算机，被施加到测量由传统的和改性PET-G材料提供的力的变化与增加的频率的矫正器移除。最后，重复测量力以检测48小时内的力变化。结果：两种材料的力随时间的推移相似地降低。当矫正器移除频率增加时，这些力也减小，但是力的减小不同。具有更高弹性模量和更大耐磨性的改性PET-G比常规PET-G表现出更稳定和更低的力变化。结论：两种材料所传递的力均在正畸力范围内。力的变化是明显的，当器具删除频率增加。与传统材料相比，改性PET-G材料表现出更好的稳定性。因此，改性PET-G是一种有前途的和适用的材料，对医生和患者都有好处。
Introduction: Many factors influence the force changes of clear aligners. The purpose of this study was to identify the various factors that influence the force changes generated by polyethylene terephthalate glycol-modified (PET-G) materials. Therefore, a force measurement system based on a flexible thin-film pressure sensor was established. Methods: A series of clear aligners with 2 material properties and different activations at the maxillary central incisor, maxillary second premolar, and maxillary permanent first molar was designed and fabricated. The first material was conventional PET-G; the second material was modified PET-G with a higher modulus of elasticity and greater abrasion resistance. Several models, including teeth and aligners, were produced. Then, a force change detection device, including a thin-film pressure sensor, a signal acquisition circuit board, and a computer, was applied to measure changes in the forces delivered by the conventional and modified PET-G materials with increased frequencies of appliance removal. Finally, the forces were repeatedly measured to detect the force changes over 48 hours. Results: The forces of both materials decreased similarly over time. These forces also decreased when the aligner removal frequency increased, but the forces decreased differently. The modified PET-G, with a higher modulus of elasticity and greater abrasion resistance, showed a more stable and lower force change than did the conventional PET-G. Conclusions: The forces delivered by both materials were within the orthodontic force range. Force changes were apparent when the appliance removal frequency increased. Compared with the conventional material, the modified PET-G material showed better stability. Therefore, the modified PET-G is a promising and applicable material with advantages for both orthodontists and patients.