Comparative biomechanical analysis of four different tooth- and bone-borne frog appliances for molar distalization : A three-dimensional finite element study.

IF 1.3 4区 医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE
Xing-Yue Wang, Dou Li, Xin-Ran Xu, Jia-Rong Liu, Waseem Saleh Al-Gumaei, Hui Xue, Xiao-Ming Wang
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引用次数: 0

Abstract

Purpose: The purpose of this study was to analyze the biomechanical effects of four different designs of frog appliances for molar distalization using finite element analysis.

Methods: A three-dimensional finite element model including complete dentition, periodontal ligament, palatine, and alveolar bone was established. Four types of frog appliances were designed to simulate maxillary molar distalization: tooth-button-borne (Type A), bone-borne (Type B), bone-button-borne (Type C), and tooth-bone-borne (Type D) frog appliances. A force of 10 N was applied simulating a screw in the anteroposterior direction. To assess the von Mises stress distribution and the resultant displacements in the teeth and periodontal tissues, geometric nonlinear theory was utilized.

Results: Compared to the conventional tooth-borne frog appliance (Type A), the bone-borne frog appliances showed increased first molar distalization with enhanced mesiolingual rotation and distal tipping, but the labial inclination and intrusion of the incisors were insignificant. When replacing the palatal acrylic button with miniscrews (Types B and D), more anchorage forces were transmitted from the first premolar to palatine bone, which was further dispersed by the assistance of a palatal acrylic button (Type C).

Conclusions: Compared to tooth-borne frog appliances, the bone-borne variants demonstrated a clear advantage for en masse molar distalization. The combined anchorage system utilizing palatal acrylic buttons and miniscrews (Type C) offers the most efficient stress distribution, minimizing force concentration on the palatine bone.

Abstract Image

用于磨牙远端矫治的四种不同牙骨质蛙式矫治器的生物力学比较分析:三维有限元研究。
目的:本研究的目的是利用有限元分析法分析四种不同设计的蛙式矫治器对磨牙远端化的生物力学影响:方法:建立了一个包括全口义齿、牙周韧带、腭骨和牙槽骨的三维有限元模型。设计了四种类型的蛙式矫治器来模拟上颌磨牙远折:牙-钮扣式(A 型)、骨-钮扣式(B 型)、骨-钮扣式(C 型)和牙-骨-钮扣式(D 型)蛙式矫治器。模拟螺钉在前后方向施加 10 N 的力。为了评估牙齿和牙周组织的 von Mises 应力分布和由此产生的位移,我们采用了几何非线性理论:与传统的牙源性蛙式矫治器(A 型)相比,骨源性蛙式矫治器显示出第一磨牙远端化增加,中叶旋转和远端倾斜增强,但切牙的唇倾和内陷不明显。当用微型螺钉(B 型和 D 型)代替腭丙烯酸按钮时,更多的锚定力从第一前磨牙传递到腭骨,在腭丙烯酸按钮(C 型)的辅助下,锚定力被进一步分散:与牙源性蛙式矫治器相比,骨源性矫治器在大规模磨牙远端矫治方面具有明显优势。利用腭丙烯酸按钮和微型螺钉(C 型)的组合锚定系统提供了最有效的应力分布,最大限度地减少了腭骨上的力集中。
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来源期刊
CiteScore
3.90
自引率
0.00%
发文量
64
审稿时长
>12 weeks
期刊介绍: The Journal of Orofacial Orthopedics provides orthodontists and dentists who are also actively interested in orthodontics, whether in university clinics or private practice, with highly authoritative and up-to-date information based on experimental and clinical research. The journal is one of the leading publications for the promulgation of the results of original work both in the areas of scientific and clinical orthodontics and related areas. All articles undergo peer review before publication. The German Society of Orthodontics (DGKFO) also publishes in the journal important communications, statements and announcements.
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