Using Coben analysis to evaluate the therapeutic effect of maxillary protraction on maxillary maldevelopment
10.7518/hxkq.2015.01.013
- VernacularTitle:应用Coben分析法评价前方牵引治疗上颌发育不足的临床疗效
- Author:
Jinliang ZHUANG
1
;
Xun LI
;
Yujun JIANG
;
Shanshan XU
;
Xiaohua DING
;
Yuanping CHEN
Author Information
1. 吉林大学口腔医院正畸科
- Keywords:
cephalometric analysis;
Coben analysis;
maxillary maldevelopment;
maxillary protraction
- From:
West China Journal of Stomatology
2015;(1):58-62
- CountryChina
- Language:Chinese
-
Abstract:
Objective We aims to evaluate the therapeutic effect of maxillary protraction on maxillary maldevelopment using Coben analysis to illustrate the advantages of Coben analysis in identifying pathogenic mechanisms and in designing treatment plans for Class Ⅲ malocclusions. Methods A total of 120 patients were diagnosed to have skeletal Class Ⅲ maloc-clusions with maxillary maldevelopment. These patients were selected as the subjects of the present research. Maxillary protraction was exerted to promote maxilla growth. Cephalometric analysis was conducted by using Coben analysis and angle analyses of Beijing Medical University to collect data before and after maxillary protraction. Results According to Coben analysis measurements, the height of facies cranii increased after maxillary protraction. The depth of lower face decreased, whereas that of mid-face increased and the Ptm-A value increased significantly in the mid-face (P<0.001). In the angle ana-lysis of Beijing Medical University, SNA, ANB, U1/NA, U1/SN, MP/SN, and Y-axis angles increased significantly (P<0.001), whereas SNB, U1/L1 (P<0.001), and L1/MP (P<0.05) decreased. Conclusion Maxillary protraction has a significant effect on growing skeletal Class Ⅲ malocclusions with the chief mechanism of Ptm-A value just diagnosed as minor by Coben analysis. Coben analysis is visual and clear in identifying pathogenic mechanisms of Class Ⅲ malocclusions.
