自锁托槽矫治器矫治初期上颌异位侧切牙及牙周组织应力的三维有限元分析被引量：10

Three-dimensional finite element analyses of stress distribution on upper lateral incisor and periodontal in early treatment by self-ligating brackets

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摘要目的通过三维有限元方法建立高精度自锁托槽矫治体系的上颌牙列及牙周组织的力学分析数字模型,研究上颌异位侧切牙在正畸矫正初期牙根、牙周组织的应力分布以及在临床矫治力作用下牙齿的位移情况。方法采用多层螺旋CT扫描上颌骨,从而获得上颌牙列及牙周组织的数据,并通过Mimics软件快速建立精确的上颌牙列、牙周膜、牙槽骨、自锁托槽、矫治弓丝的三维有限元模型。模拟临床矫治过程中矫治器的粘接以及弓丝带入托槽槽沟的过程,通过弓丝形变时的预应力来测定牙齿的受力,从而获得临床状态下侧切牙正畸矫治力与牙周组织应力以及牙齿位移的情况。结果在牙齿矫正初期牙根部应力主要为牙根中部1/3与根尖交界处,牙周膜应力主要为牙颈部,牙槽骨应力相对复杂,牙齿移动为倾斜移动。结论运用三维有限元软件建立的实体模型真实、准确。临床矫治过程中,牙周组织的主要应力集中区即为组织受力薄弱区,是容易发生病变的部位,在治疗过程中应尽量避开这些薄弱区域。根据位移情况看,牙齿会出现倾斜移动,因此,在临床矫治过程中,医生可根据实际情况选用合适的矫治方法来获得最佳的治疗效果。 Objective Three-dimensional element method was used to reconstrust the high accuracy of self-ligating brackets system on periodontal tissue of maxillary dentition. To investigate the upper lateral incisor on stress and strain distributions of periodontal ligament of maxillary canine and displacement under the orthodontics force. Methods Scanning images of maxilla and dentitions were made through multi-slice CT scanner. Mimics software was used to reconstruct a three-dimensional element model of maxilla, dentitions, periodontal membrane, self-ligating and edgewise appliance. Simulation the engagement of archiwire into brackets. Regarding the prestress of edgewise to proposed method could get the real-time lateral incisor orthodontic force and movement. Results In the early orthodontic treatment, root stress was mainly root central 1/3 and at the junction of root tip, periodontal membrane stress was mainly for tooth neck, the stress of the alveolar bone is relatively complex, tooth movement for the tilt movement. Conclusion The model has high biological similarity and reasonable mesh with t＇mite element software. In the process of clinical treatment, the main stress of periodontal tissue clusters is the weak area stress, prone to disease, in the course of treatment should avoid these areas. According to the displacement of the tooth root, the teeth is tilt movement. The dentist should rationally take all these parameters into account in the clinical treatment.

作者王波张桂香石晶彭惠张莹

机构地区佳木斯大学口腔医院口腔正畸科大庆油田五官医院口腔科大庆油田总医院口腔正畸科

出处《国际口腔医学杂志》 CAS 北大核心 2015年第4期406-410,共5页 International Journal of Stomatology

关键词侧切牙自锁托槽矫治器三维有限元 lateral incisor self-ligating bracket three-dimensional finite element

分类号 R783.5 [医药卫生—口腔医学]

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