关键词: 颅面特征, Ⅱ类错牙合, Ⅲ类错牙合, X线头影测量分析

Abstract:

Abstract：Objective To analyze craniofacial characteristics of hard and soft tissue of class Ⅱand Ⅲ malocclusions in early permanent dentition，so as to find out the key points in orthodontics. Methods A total of 80 Han adolescents with malocclusion， who visited Zigong No 4 People’s Hospital Dental Clinic during 2000 to 2012， were chosen. They were divided into classⅡand class Ⅲ groups， each group containing 40 patients; meanwhile， 40 normal adolescents in Zigong elementary and secondary school students’oral health survey were chosen as the control group. Seven soft tissue and 16 hard tissue measurements were used to analyze the cephalometric characteristics. Results Compared with the control group，except 7 hard tissue measurements，the rest of classⅡ group had significantly statistical differences（P＜0.05）；in class Ⅲ group，there were 9 hard tissue and 5 soft tissue items which were statistically significant（P＜0.05）. Conclusion There are typical craniofacial characteristics in different malocclusions，therefore doctors should correct the teeth and bones’abnormity properly and coordinate soft tissue to achieve the harmonious and beautiful profile.

Key words: craniofacial characteristics, classⅡmalocclusion, classⅢ malocclusion, cephalometric analysis