摘要
目的:通过对颅颌面形态和牙弓宽度的联合研究,探讨安氏Ⅱ类2分类错患者的特征及发病机制。方法:选取50例13~18岁(安氏Ⅱ类2分类错患者26例和个别正常者24例)未正畸治疗患者取记录模型和拍摄头颅侧位片。在记录模型上用电子游标卡尺测量牙弓宽度和牙冠宽度,计算Pont指数;头颅侧位片采用WinCeph 8.0软件系统测量相关的15项骨性指标,对测量结果采用SPSS.13.0 for Windows统计软件进行两个独立样本的t检验。结果:模型测量显示安氏Ⅱ类2分类错组患者的上下颌尖牙段和前磨牙段的宽度均明显小于个别正常组(P<0.05),同时安氏Ⅱ类2分类错组的前磨牙Pont指数明显大于个别正常组(P<0.05)。头颅侧位片分析显示∠SNB,A.P.D.I.ANS-Me,ANS-Me/N-Me(%)小于个别正常组,O.D.I.和Pog-NB大于个别正常组(P<0.05)。结论:安氏Ⅱ类2分类错患者上下颌尖牙及前磨牙段牙弓宽度发育不足,下颌牙槽骨及面下1/3发育不足而颏部发育正常。
Objective:The aim of this compound cephalometric and arch-width study was to determine arch-width and skeletal differences between subjects with Class Ⅰ normal and with Class Ⅱ division 2 malocclusions.Methods:50 untreated patients'dental models and lateral cephalograms were selected;arch width and tooth width measurements were carried out on study models using a calibrated digital caliper.The radiographs were digitized and processed using WinCeph 8.0 Imaging software,and an independent sample T-test was carried out in order to compare the two groups.Results:The statistically significant differences between the groups for the study model measurements were in maxillary and mandibular intercanine,and interpremolar width.The cephalometric results revealed that ∠SNB and A.P.D.I.ANS-Me,ANS-Me/N-Me(%),O.D.I.and Pog-NB were different between the two groups.Conclusion:Class Ⅱ division 2 malocclusion patients' maxillary and mandibular intercanine,and interpremolar width are smaller and they show similar chin prominent,but compared with the Class Ⅰ normal group,the Class Ⅱ division 2 malocclusion patients exhibit mandibular restriction.
出处
《重庆医科大学学报》
CAS
CSCD
北大核心
2010年第12期1863-1866,共4页
Journal of Chongqing Medical University
基金
重庆市教育委员会资助项目(编号:KJ080310)
重庆市卫生局资助项目(编号:2009-2-144)