双钥匙曲关闭下颌拔牙间隙的Typodont模型研究  

Typodont model study on double keyhole loop in mandibular extraction space closure

作　　者：蔡森鑫 刘佳莉 陈泽兴 许潾于[2] 苏杰华[2] CAI Senxin;LIU Jiali;CHEN Zexing;XU Linyu;SU Jiehua(Fujian Key Laboratory of Oral Diseases&Fujian Provincial Engineering Research Center of Oral Biomaterial&Stomatological Key Lab of Fujian College and University,School and Hospital of Stomatology,Fujian Medical University,Fuzhou 350002,China;Institute of Stomatology&Research Center of Dental and Research Center of Dental Esthetics and Biomechanics,School and Hospital of Stomatology,Fujian Medical University,Fuzhou 350002,China)

机构地区：[1]福建省口腔疾病研究重点实验室,福建省口腔生物材料工程技术研究中心,福建省高校口腔医学重点实验室,福建医科大学口腔医学院/附属口腔医院,福建福州350002 [2]福建医科大学口腔医学研究院,福建医科大学口腔生物力学与美学研究中心,福建医科大学口腔医学院/附属口腔医院,福建福州350002

出　　处：《口腔疾病防治》2020年第10期635-640,共6页Journal of Prevention and Treatment for Stomatological Diseases

基　　金：福建省自然科学基金(2017J01808);福建省中青年教师教育科研项目(JT180204);福建省卫健委医学创新课题(2015-CXB-22);福建省卫健委青年科研课题(2015-1-63);福建医科大学附属口腔医院院内科研项目(2017-KQCL-01)。

摘　　要：目的通过Typodont模型及逆向工程技术,分析不同激活方式下双钥匙曲(double-keyhole loop,DKHL)唇弓关闭下颌第一前磨牙拔牙间隙的结果差异,为临床治疗提供指导基础。方法取标准正常Typodont下颌模型9副水浴整平后随机分为3组,分别采用DKHL的3种激活方式进行加载。重叠初始和水浴后数字模型,分析不同工况加载前后牙冠和牙根标志点三维位移变化,并以SPSS 19.0进行数据统计分析。结果相同条件下,利用钥匙曲顶部加载关闭间隙(工况2、工况3)时,前牙牙根内收量及后牙前移量明显大于水平加载组(工况1),并且双钥匙曲顶部结扎时(工况3)下切牙段明显压低、后牙段明显伸长和颊倾,差异具有统计学意义。结论 DKHL唇弓不同激活方式可以灵活控制下颌前牙和后牙的移动方式,临床应用中应根据患者情况选择合适的加力方法。Objective To analyze the impact of the activation mode on the results of space closure in the mandibu-lar arch using a double keyhole loop(DKHL) with a typodont model and reverse engineering technique to provide guid-ance for clinical treatment.Methods Nine normal mandibular typodont models after leveling were randomly dividedinto 3 groups, which then underwent three types of DKHL activation for space closure. Each model was assessed at theinitial stage and after the warm water bath, and the images were superimposed to measure the displacement of specialcrown and root mark points. All statistical analysis of the data was performed using SPSS 19.0.Results After equal ac-tivation times, the root retraction of anterior teeth and the crown forward position of posterior teeth in groups activatedat the distal loop(conditions 2 and 3) were much greater than those in the group activated horizontally(condition 1). Ac-tivation between mesial and distal loops(condition 3) induced significant anterior tooth intrusion, together with elonga-tion and buccal inclination of posterior teeth. The displacement of mark points among the three conditions showed a sta-tistically significant difference.Conclusion The movement of mandibular anterior and posterior teeth could be flexiblycontrolled through different DKHL activation modes, which should be chosen carefully according to individual condi-tions.

关 键 词：双钥匙曲 Typodont模型 逆向工程 正畸治疗 正畸间隙关闭 牙冠形态 三维移动 

分 类 号：R78[医药卫生—口腔医学]