摘要
背景:下前牙区骨壁较薄,使用无托槽隐形矫治器压低下前牙存在唇侧骨板吸收风险。矢状向过矫治对下前牙唇舌向控制产生的影响尚未见报道。目的:探究矢状向过矫治对下前牙特别是对牙颈部和根部位移和所受应力产生的影响。方法:通过1例男性志愿者锥形束CT,在MIMICS和GEOMAGICS软件中三维重建下颌骨与下牙列,并且在SOLIDWORKS软件中构建牙周膜、附件和矫治器模型。实验首先分为双侧下尖牙压低组和下切牙压低组,接着在双侧下中切牙和侧切牙上依次添加0°,1°,2°过矫治,共计6组模型。模型装配完成后,在ANSYS软件中分析计算位移量和应力水平。结果与结论:①压低尖牙时,尖牙舌倾压低,切牙舌倾伸长;压低切牙时,切牙舌倾压低,尖牙舌倾伸长;②无过矫治时,切牙颈部舌向移动,根部唇向移动;加入过矫治后,切牙位移逐渐直立,继而唇倾,并且1°过矫治下牙颈部和根部唇舌向位移量最少;③加入过矫治后,尖牙压低组中切牙颈部牙周膜的应力集中区由唇侧转为舌侧,切牙压低组切牙颈部牙周膜的应力集中区由舌侧转为唇侧;④使用无托槽隐形矫治器压低下前牙时,切牙易伴发舌向倾斜移动;矢状向过矫治设计有利于维持切牙唇舌向位置的稳定,但过矫治应适量,过量的过矫治会加重下切牙的唇倾趋势。
BACKGROUND:The thin alveolar bone in the lower anterior region increases the risk of labial bone resorption when intruding the teeth with clear aligners.The effect of sagittal overcorrection design on the labiolingual control of mandibular anterior teeth intrusion has not been fully investigated.OBJECTIVE:To explore the effect of overcorrection on the changes in the displacement and stress of the mandibular anterior teeth,especially the cervical and apical regions.METHODS:Through a male volunteer cone-beam CT data,the three-dimensional reconstruction of the mandible and teeth was conducted in the MIMICS and GEOMAGIC software.Moreover,the models of periodontal ligaments,attachments,and appliances were created in the SOLIDWORKS software.First,the study was divided into canine intrusion group and incisor intrusion group.Then,the overcorrection(0°,1°,2°)was designed on the bilateral mandibular central and lateral incisors.A total of six models were established.The models were assembled and imported into the ANSYS software to analyze and calculate the displacement and stress level.RESULTS AND CONCLUSION:(1)In the canine intrusion group,canines intruded and tipped lingually while incisors extruded and tipped lingually.In the incisor intrusion group,canines extruded and tipped lingually while incisors intruded and tipped lingually.(2)Without overcorrection,the incisors necks moved lingually while apexes moved labially.With overcorrection,the incisors tended to be upright,followed by labial tilt.The least cervical and apical displacements were detected under 1°overcorrection.(3)With overcorrection,the incisal cervical stress concentration area shifted from labial to lingual in the canine intrusion group,whereas the stress concentration area shifted from lingual to labial in the incisor intrusion group.(4)The incisors tended to tilt lingually when intruding the mandibular anterior teeth with clear aligners.The sagittal overcorrection design was conductive to maintain the stable position of incisors.However,the amount of overcorrection should be moderate.Excessive overcorrection might increase the labial inclination tendencies of incisors.
作者
黄钖钖
王诗语
刘浩
杨丽
王鹏来
袁长永
Huang Yangyang;Wang Shiyu;Liu Hao;Yang Li;Wang Penglai;Yuan Changyong(School of Stomatology,Xuzhou Medical University,Xuzhou 221000,Jiangsu Province,China;Department of Orthodontics,Affiliated Stomatological Hospital of Xuzhou Medical University,Xuzhou 221000,Jiangsu Province,China;Department of Implantology,Affiliated Stomatological Hospital of Xuzhou Medical University,Xuzhou 221000,Jiangsu Province,China)
出处
《中国组织工程研究》
CAS
北大核心
2024年第29期4593-4598,共6页
Chinese Journal of Tissue Engineering Research
基金
徐州市卫生健康委科技项目(XWKYHT20220133),课题名称:无托槽隐形矫治技术在成人深覆合治疗中的过矫治研究,项目负责人:杨丽。
关键词
无托槽隐形矫治
下前牙压低
过矫治
生物力学性能
有限元
clear aligner
mandibular anterior teeth intrusion
overcorrection
biomechanical property
finite element
