混合牙列期与恒牙列早期安氏Ⅱ类2分类错下颌生长发育特征的研究  

A longitudinal study of mandible growth of Angle Class Ⅱ division 2 malocclusion from mixed dentition to permanent dentition

作　　者：王瑜[1] 秦朴[1] 杜跃华[1] 

机构地区：[1]重庆医科大学附属口腔医院正畸科,重庆400015

出　　处：《华西口腔医学杂志》2011年第3期257-260,共4页West China Journal of Stomatology

基　　金：重庆市教育委员会科研基金资助项目(KJ080310);重庆市卫生局医学科研基金资助项目(2008-2-230;2009-2-144)

摘　　要：目的对混合牙列期与恒牙列早期安氏Ⅱ类2分类错下颌生长发育特点进行分析比较。方法研究样本包括95名安氏Ⅱ类2分类错青少年与75名正常青少年。对每个对象拍摄手腕骨片和头颅侧位片,进行X线片头影测量分析。结果混合牙列期到恒牙列早期的变化如下。1)角度:对照组SNB、S-Ba-Go增大,Ar-Go-Me、SN-MP、NSGn减小;实验组SNB、Ar-Go-Me、Cd-Go-Me、SN-MP、S-Ar-Go、S-Ba-Go变化无显著性。实验组Y轴角、NSGn增大,对照组Y轴变化无显著性。2)颏部:实验组除了颏凹陷增大外,其余各项指标变化差异无统计学意义。对照组除颏曲度减小外,颏高、颏厚、颏凹陷、颏厚/颏高、SL、Pog to NB增大。3)线距:对照组Cd-Go、Gn-Cd、Go-Me、Ar-Pog、Ar-Go的生长量大于实验组。结论本研究提出的混合牙列期与恒牙列早期安氏Ⅱ类2分类错下颌的生长发育特点有助于临床医生治疗中作出合理的计划。Objective To determine the longitudinal growth changes of mandible from mixed dentition to permanent dentition on Angle Class Ⅱ division 2 malocclusion.Methods The sample consisted of 95 students with Angle Class Ⅱ division 2 malocclusion and 75 students with normal occlusion.Cephalometric radiographs and hand-wrist radiographs were obtained for all the samples.And analysis of all the cephalograms was carried out.Results The study of growth changes of mandible from mixed dentition to permanent dentition showed that： 1）angle： The control group showed an increase in SNB and S-Ba-Go and a decrease in Ar-Go-Me,SN-MP and NSGn.In the experimental group,the changes in SNB,Ar-Go-Me,Cd-Go-Me,SN-MP,S-Ar-Go,S-Ba-Go were not of statistical significance,however,Y angle and NSGn were increased.In the control group,there was no statistically significant change in the Y angle.2）chin： In the experimental group,chin concavity increased.The changes were not statistically significant for the other index.In the control group,chin curvature decreased.The chin height,chin depth,chin concavity,chin depth/chin height,SL and Pog to NB increased.3）spacing： The growth of Cd-Go,Gn-Cd,Go-Me,Ar-Pog,Ar-Go in the control group was more than that of the experimental group.Conclusion The present finding will help the clinicians to come to a diagnosis and reasonable treatment plan in Angle Class Ⅱ division 2 patients.

关 键 词：安氏Ⅱ类2分类 下颌骨 错 

分 类 号：R783.5[医药卫生—口腔医学]