Total mesialization of the mandibular dentition using a mini-implant-supported device : A finite element analysis.

IF 1.3 4区医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-08-01 Epub Date: 2023-11-14 DOI:10.1007/s00056-023-00502-1

Xi Wang, Le Yang, Yeling Zhu, Weicai Wang, Chen Zhou, Yang Cao, Baicheng Bao, Jiazhi Li

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引用次数: 0

Abstract

Purpose: Total mandibular arch mesialization using mini-implants is challenging due to anatomic limitations. The aim of this study was to introduce a mini-implant-supported device for total mesialization of the mandibular dentition and to analyze the biomechanical properties of the device.

Methods: Finite element models were constructed to explore the effect of friction and force direction on the force transmission efficiency of the device. In addition, the three-dimensional displacement of each tooth was evaluated with two force application points (2 or 8 mm hooks) under three force conditions (symmetric: 150 g of force on both sides, or asymmetric: 100 and 200 g of force on each side).

Results: The force transmission efficiency was 66.7% under a friction coefficient of 0.15 and parallel pushing and pulling forces. The force transmission efficiency was 65.90 and 66.63% when the pushing force was 15° away from the pulling force on the sagittal and horizontal planes, respectively. The mandibular dentition moved mesially with a greater tendency for incisor labial crown tipping, mesial molar rotation and buccal second molar crown tipping when using the 8 mm hook compared to that when using the 2 mm hook. Rigid archwires resulted in more consistent tooth mesialization than stainless steel archwires. Asymmetric forces resulted in asymmetric dental arch mesialization.

Conclusion: The forces transmitted by the presented mini-implant-supported device varied depending on the friction level and force direction. The device should be able to achieve symmetric or asymmetric total mesialization of the mandibular dentition.

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使用微型种植体支持装置的下颌牙列的全内嵌化:有限元分析。

目的:由于解剖学上的限制，使用微型种植体进行全下颌弓内固定是具有挑战性的。本研究的目的是介绍一种用于下颌牙列全内嵌的小型种植体支持装置，并分析该装置的生物力学特性。方法:建立有限元模型，探讨摩擦力和受力方向对装置传力效率的影响。此外，在三种受力条件下(对称:两侧施加150 g的力，或不对称:两侧施加100和200 g的力)，用两个施力点(2或8 mm钩)评估每个牙齿的三维位移。结果:在摩擦系数为0.15、推拉力平行的情况下，传力效率为66.7%。当推力与拉力在矢状面和水平面上偏离15°时，力的传递效率分别为65.90%和66.63%。与使用2 mm钩相比，使用8 mm钩时下颌牙列近端移动更倾向于门牙唇冠倾斜、近端磨牙旋转和颊第二磨牙冠倾斜。刚性弓丝比不锈钢弓丝产生更一致的齿化。不对称力导致牙弓不对称化。结论:所设计的微型种植体支撑装置所传递的力随摩擦水平和受力方向的不同而变化。该装置应能实现对称或不对称的下颌牙列的全内嵌。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie 医学-牙科与口腔外科

CiteScore

3.90

自引率

0.00%

发文量

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.