外科辅助快速腭扩展中牙支持式与骨支持式扩弓装置的骨骼和牙齿变化比较：一项有限元研究。
Comparison of the skeletal and dental changes of tooth-borne vs. bone-borne expansion devices in surgically assisted rapid palatal expansion: A finite element study.
作者信息
Tehranchi Azita, Ameli Nazila, Najirad Zahra, Mirhashemi Fatemeh Sadat
机构信息
Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Orthodontic Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
出版信息
Dent Res J (Isfahan). 2013 Nov;10(6):777-83.
BACKGROUND
The aim of this study was to compare the skeletal and dental changes of a tooth-borne (Hyrax) and a bone-borne (Smile distractor) expansion devices using three-dimensional model of a human skull.
MATERIALS AND METHODS
A finite element model of human skull was generated using data from 3-D CT scans of an 11-year-old female child. Then a Hyrax expander (tooth-borne appliance) and Smile distractor (bone-borne appliance) in three different positions were adapted to the finite element model and expanded for 0.5 mm simulating the clinical situation. The 3-D pattern of displacement and stress distribution was then analyzed.
RESULTS
The results of this study showed that screw position affects the stress and displacement pattern within the nasomaxillary complex and maxillary dental arch.
CONCLUSION
Closer teeth feel more stress and undergo more displacement than the farther ones. Moreover, skeletal effects of the Smile distractor were greater than of Hyrax in all different positions.
背景
本研究的目的是使用人类颅骨的三维模型比较牙支持式（Hyrax）和骨支持式（微笑扩弓器）扩弓装置引起的骨骼和牙齿变化。
材料与方法
利用一名11岁女童的三维CT扫描数据生成人类颅骨的有限元模型。然后将处于三个不同位置的Hyrax扩弓器（牙支持式矫治器）和微笑扩弓器（骨支持式矫治器）适配到有限元模型上，并模拟临床情况扩展0.5毫米。随后分析位移和应力分布的三维模式。
结果
本研究结果表明，螺钉位置会影响鼻上颌复合体和上颌牙弓内的应力和位移模式。
结论
距离较近的牙齿比距离较远的牙齿承受更多应力且位移更大。此外，在所有不同位置，微笑扩弓器的骨骼效应均大于Hyrax扩弓器。
Zotero 插件