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Evaluation of Long-term Stability of Vertical Control in hyperdivergent Patients Treated with Temporary Anchorage Devices

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Current Medical Science 2018年第5期38卷 914-919页

作者： Jin-rong DENG Yan-ang LI Xue-dong WANG Jing LI Yun DING Yan-heng ZHOU Department of Orthodontics School and Hospital of StomatologyPeking UniversityBeijing 100081China Sunny Dental Room 2307Building1Henglong PlazaShanghai 310000China 3rd Dental Center School and Hospital of StomatologyPeking UniversityBeijing 100191China

This study aims to evaluate,the long-term stability of vertical control in hyperdivergent patients treated with temporary anchorage devices.The sample included 20 hyperdivergent patients without anterior open bite.The temporary anchorage devices were used to intrude the upper incisor and molars for vertical control.Lateral cephalograms were established prior to treatment,immediately after treatment,and during retention. The upper molars and incisors were intruded by 1.33 mm and 1.41 mm after treatment (P0.05).U1-PP was found to possess a significant extrusion of 1.2 mm during the first stage (P0.05). The mandibular plane angle (MP-SN)decreased by 2.58 degrees following treatment, and underwent a relapse of 0.51 degree and 0.42 degree during the first and second stages of retention respectively (P>0.05).No significant soft tissue changes occurred,with the exception of increased upper lip length during the second stage (P<0.05).Maxillary anterior and posterior intrusions,counter clockwise rotation,of the mandibular plane,and improved profiles can be successfully achieved following treatment with vertical control. During the first stage of retention (less than three years),intruded molars and incisors both exhibited some extrusion,and molars had better long-term stability than incisors. During the second stage of retention (three to six years),the therapeutic effects appeared stable,with the exception of some increase in upper lip length.Rotated mandibular plane remained stable during the entire retention period.

关键词： hyperdivergent temporary anchorage devices molar intrusion vertical control

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Evaluation of the Temporomandibular Joint in Class Ⅰ,Ⅱ, and Ⅲ hyperdivergent Patients:A Comparative Study by Three-dimensional Cone-beam Computed Tomography

Evaluation of the Temporomandibular Joint in Class Ⅰ,Ⅱ, an...

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作者： Bimal Panthi 南京大学

学位级别：硕士

[Objective]To evaluate the joint spaces and condylar morphology among different vertical skeletal patterns to compare condylar position and morphology.[Materials and Methods]Diagnostic cone-beam computed tomography images of 80 adult patients (160 temporomandibular joints) who visited the Department of Orthodontics, Affiliated Stomatology Hospital of Medical School, Nanjing University were evaluated using Mimics 16.0 software. The subjects were divided into four equal groups based on angles classification and Frankfurt Horizontal plane-Mandibular plane Angle. Group Ⅰ included skeletal Class Ⅰ normodivergent patients whereas Group Ⅱ, Ⅲ, and Ⅳ were skeletal Class Ⅰ, Ⅱ and Ⅲ hyperdivergent patients respectively. Temporomandibular joint spaces, depth of mandibular fossa and condylar morphology and asymmetry were compared among the groups.[Results]1.Significant difference values were seen in the anteroposterior diameter of condylar process on right (p=0.005) and left (p=0.011) side, mesiolateral diameter of condylar process on left (p=0.008) side, lateromedial plane angle of condylar process right (p=0.004) and left (p=0.00) side, axial condylar angle right (p=0.011) and left (p=0.001) side and the anteroposterior difference of the condylar processes (p=0.002) among all the four groups i.e. class Ⅰ normodivergent group and class Ⅰ, Ⅱ and Ⅲ hyperdivergent groups.2. Anterior joint space on both right (p=0.037) and left (p=0.04) side, superior joint space on left (p=0.30) and posterior joint space on both the right (p=0.013) and left (p=0.01) sides were found to be significantly different. This data suggest that the condyles in class Ⅱ hyperdivergent patients are nonconcentric than the class Ⅰ hyperdivergent patients.3. The mean anteroposterior diameter of the class Ⅱ hyperdivergent patients was R=4.33±1.56, L=4.24±1.64 and class Ⅰ hyperdivergent was R=5.37±0.84, L=5.25±1.24. The mean mesiolateral diameter of the class Ⅱ hyperdivergent group was R=10.90±3.23, L=10.00±2.84 and class Ⅰ hyperdivergent group was R=12.57±2.90

关键词： Cone Beam Computed tomography (CBCT) Temporomandibular joint Condylar morphology Condylar axial angle hyperdivergent

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