附件设计和位置对下第二前脱的影响:有限元分析
Demet Kaya1, Banu Saglam-Aydinatay2
1Beytepe Polyclinic, Adult Hospital, Hacettepe University, Ankara, Turkey. demorto@hacettepe.edu.tr.
概括
在口腔和舌头表面的形垂直矩形附件 (bVRA) 优化了下第二前脱皮. 这种附件设计在清晰对齐器处理过程中提高了牙运动的可预测性和生物机械效率.
科学领域:
- 矯正牙科 矯正牙科是一種矯正牙科.
- 生物材料科学 生物材料科学
- 有限元分析 有限元分析
背景情况:
- 清晰对齐器治疗是一种流行的正统牙科治疗.
- 可预测的牙运动,特别是旋转,仍然是一个挑战.
- 附件可以提高对齐器的效率,但最佳的设计和放置需要研究.
研究的目的:
- 通过有限元分析,评估附件设计 (垂直矩形附件-VRA与形VRA-bVRA) 和位置 (口腔,舌头或两者) 对下第二前脱的影响.
- 为了比较不同附着配置对牙移位,对齐器变形和牙周带 (PDL) 和对齐器内的应力分布的生物力学影响.
主要方法:
- 构建了一个下弓的3D有限元模型,包括牙,PDL,骨,附件和一个清晰的对齐器.
- 模拟了七种模型:没有附着,口腔VRA,口腔bVRA,舌头VRA,舌头bVRA,口腔/舌头VRA或bVRA组合.
- 每个对齐器都提供了1.2°脱旋激活,并分析了牙位移,对齐器变形和应力模式.
主要成果:
- 口腔和舌腔bVRA模型 (模型7) 显示了最大的牙位移 (0.087毫米,0.51°),并诱导了PDL (6.780MPa) 和对齐器 (101.258MPa) 中最高的应力,对齐器变形最小 (0.469毫米).
- 没有附着的模型 (模型1) 显示了最小的位移 (0.067毫米,0.39°),最大的对齐器变形 (0.523毫米),以及在PDL (6.253MPa) 和对齐器 (62.667MPa) 中最低的应力.
- bVRA总是比VRA产生更大的脱落,并且两面上的附件比单面的附件更有效.
结论:
- 在口腔和舌头表面放置的形垂直矩形附件 (bVRA) 提供了最可控和可预测的下第二前的脱落.
- 在PDL和对齐器中观察到的对齐器变形和应力分布与管理有效牙运动的生物力学原理保持一致.
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