中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (4): 510-515.doi: 10.3969/j.issn.2095-4344.0082

• 口腔组织构建 oral tissue construction • 上一篇    下一篇

舌侧矫治技术整体内收下前牙的三维有限元分析

刘代斌1,陆大敏2,方志欣1,周  嫣1,黄敏方1   

  1. 1广西壮族自治区人民医院口腔正畸科,广西壮族自治区南宁市  530021;2广西大学土木建筑工程学院,广西壮族自治区南宁市  530004
  • 收稿日期:2017-09-15 出版日期:2018-02-08 发布日期:2018-02-08
  • 通讯作者: 方志欣,主任医师,硕士生导师,广西壮族自治区人民医院口腔正畸科,广西壮族自治区南宁市 530021
  • 作者简介:刘代斌,男,1980年生,2015年广西医科大学毕业,硕士,主治医师,刘代斌现在长沙市口腔医院,主要从事口腔正畸学临床研究。
  • 基金资助:

    广西自然科学基金[桂科基2012GXNSFAA053127];广西卫计委课题[桂卫Z2015356];广西第十五批“新世纪十百千人才工程”第二层次人选专项资金

Three-dimensional finite element analysis of the en-masse retraction of lower anterior teeth in lingual bracket system

Liu Dai-bin1, Lu Da-min2, Fang Zhi-xin1, Zhou Yan1, Huang Min-fang1   

  1. 1Department of Orthodontics, the People’s Hospital of Guangxi Zhuang Autonomous Region, Nanning 530021, Guangxi Zhuang Autonomous Region, China; 2School of Architecture and Construction, Guangxi University, Nanning 530004, Guangxi Zhuang Autonomous Region, China
  • Received:2017-09-15 Online:2018-02-08 Published:2018-02-08
  • Contact: Fang Zhi-xin, Chief physician, Master’s supervisor, Department of Orthodontics, the People’s Hospital of Guangxi Zhuang Autonomous Region, Nanning 530021, Guangxi Zhuang Autonomous Region, China
  • About author:Liu Dai-bin, Master, Attending physician, Department of Orthodontics, the People’s Hospital of Guangxi Zhuang Autonomous Region, Nanning 530021, Guangxi Zhuang Autonomous Region, China
  • Supported by:

    the Natural Science Foundation of Guangxi Zhuang Autonomous Region, No. 2012GXNSFAA053127; the Project of Health and Family Planning Commission of Guangxi Zhuang Autonomous Region, No. Z2015356; the Fund for the Second-Level Candidates of Guangxi Fifteenth “New Century Ten Thousands Talents Project”

摘要:

文章快速阅读:


文题释义:
舌侧矫治技术:舌侧矫治技术不同于传统唇侧矫治技术,它的最大优点是将矫治器件粘接于牙列的舌侧,在整个正畸治疗过程中,矫治器不外现,最大程度地满足了患者美观正畸的需求。但传统舌侧矫治技术临床操作较复杂,初戴矫治器时,对患者的舌头会产生刺激,影响发音功能,口腔卫生的护理较唇侧矫治技术需要花费更多的时间。个性化舌侧矫治技术出现后,极大地简化了临床操作程序,增加了患者的耐受性,由于舌侧矫治技术同时具有对牙齿进行三维控制的能力,故是目前最能兼具美观和高效的隐形矫治技术。
前牙内收牙齿移动趋势:在前牙需要较大范围内收的错牙合畸形的正畸治疗过程中,前牙容易发生舌侧倾斜移动,导致前牙正转矩的丢失。而舌侧矫治技术与唇侧矫治技术相比,其受力状态有很多不同,前牙受力点位于其抗力中心的舌侧,在内收前牙的过程中更容易造成前牙正转矩的丧失,前牙正转矩一旦丧失,再恢复则非常困难,直接导致矫治结果无法达到美观及功能的理想效果。

 

摘要
背景:
舌侧矫治技术是目前最能兼顾美观及高效等优点的隐形矫治技术,但其在前牙较大范围内收的过程中,前牙转矩的控制较难,对此学者们进行了较多力学研究,但多针对上颌牙列,对下前牙整体内收的力学特征的研究相对较少。
目的:分析舌侧矫治技术滑动法整体内收下前牙时牙移动的生物力学特征。
方法:利用志愿者的CT扫描数据及舌侧托槽等实体数据,通过一系列专用软件的运行,建立包含下颌骨、牙周膜、牙列(拔除左右第1双尖牙)、舌侧托槽、有牵引钩(位于侧切牙与尖牙之间,距离弓丝平面11 mm)的舌侧弓丝等的整体下颌三维有限元模型,利用此模型,在前牙区舌侧牵引钩和第1磨牙舌侧牵引钩间(距离弓丝平面2 mm)加力1.5 N整体内收下颌前牙,初步分析加载条件下前牙位移趋势和牙周膜应力分布特征。
结果与结论:建立了舌侧矫治技术整体内收下前牙的整体三维有限元模型,该模型几何相似性强,临床模拟度较高。加力后,切牙牙冠均有舌侧倾斜并伸长移动趋势,侧切牙更明显。尖牙则颊倾并近中倾斜及压低移动趋势。牙周膜的应力分布与牙齿的位移趋势相适应。故舌侧矫治技术前牙区较长牵引钩整体内收下前牙时,切牙仍呈舌倾移动趋势,尖牙无远中倾斜趋势。可见舌侧矫治技术整体内收下前牙时,前牙更易舌倾,长牵引钩有利于尖牙的整体移动,对切牙的垂直向控制不利。

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程
ORCID: 0000-0002-2544-6258(方志欣)

关键词: 舌侧托槽, 生物力学, 正畸, 下颌, 前牙, 滑动法, 整体内收, 有限元分析

Abstract:

BACKGROUND: Lingual bracket system is the best invisible orthodontic appliance due to its aesthetics and efficiency, but it is difficult to control anterior tooth torque during the distal retraction of the anterior tooth. Thereafter, lots of studies on maxillary anterior teeth have been conducted, but there is less knowledge about the mechanical characteristics of whole mandible dentition distal retaction.
OBJECTIVE: To analyze the biomechanical characteristics of the mandibular anterior teeth distal retracted by sliding method in lingual orthodontic treatment.
METHODS: A three-dimensional finite element model was constructed using a series of specialized software based on volunteer’s CT data and lingual brackets, including the mandible, alveolar bone, periodontal ligament, dentition (removal of the two first premolars), lingual brackets and arch wire with hooks (located between lateral incisor and canine and 11 mm distant from the arch wire plane). Subsequently,
1.5 N lingual forces through the hooks of first molar (2 mm distant from the arch wire plane) and the hooks between the lower lateral incisor and canine were loaded and the biomechanical characteristics of the mandibular anterior teeth movement during the en-masse retraction were analyzed.
RESULTS AND CONCLUSION: The finite element model was constructed successfully, and had a higher geometrical similarity and resemblance of clinical situation. The crowns of lower incisors showed the tendency of lingual inclination and extension, and this tendency was more obvious in the lateral incisors. The canines were buccal and mesial inclination and intrusion. The periodontal stress concentration area was corresponded with the tendency of tooth movement. Therefore, the movement tendency of incisors is still lingual inclination when mandibular anterior teeth distal retracted by a longer hook in lingual brackets system, and there is no distal inclination. Overall, lower incisors are easy to exhibit lingual inclination; the long anterior hooks contribute to the movement of canines, but it is not available for the vertical control of incisors during mandibular anterior tooth distal retraction.

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程

Key words: Orthodontics, Tooth, Finite Element Analysis, Tissue Engineering

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