Comparsion of soft and hard tissue profiles of adolescent patients with class II division 1 malocclusion between before and after treated with two different kinds of tooth extraction methods
10.13481/j.1671-587x.20180324
- Author:
Xiaoyuan MA
1
Author Information
1. Department of Orthodontics, Stomatology Hospital, Jilin University
- Publication Type:Journal Article
- Keywords:
Class II division 1 malocclusion;
Extraction;
Soft and hard tissue profile
- From:
Journal of Jilin University(Medicine Edition)
2018;44(3):585-591
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To compare the changes of soft and hard tissue profiles of the adolescent patients with class II division 1 malocclusion between before and after treated with two different kinds of tooth extraction methods, and to provide the reference for clinical treatment. Methods: A total of 60 adolescent patients with class II division 1 malocclusion were included, and they were divided into 44/44 group (n=30) and 44/55 group (n= 30) based on different kinds of tooth extraction methods. Four first premolars of the patients in 44/44 group were extracted and 2 maxillary first premolars and 2 mandibular second premolars of the patients in 44/55 group were extracted. The measurement indexes of pre-treatment (Tl) and post-treatment (T2) and their difference values (T2 -Tl) of soft and hard tissues of the adolescent patients were detected by lateral cephalometric radiographs. Results: As for the hard tissue, compared with before treatment, the Overjet, SNA, ANB, Ul-NA, distance of Ul-NA, Ul-SN, NA-PA, and A-NP of the adolescent patients in two groups after treatment were decreasd (P< 0. 01), and Ul-Ll and Pog-NB were increased (P<0. 05 or P<0. 01); as for the soft tissue, compared with before treatment, the H angle, UL-SnPg', LL-SnPg', UL-ELine, LL-ELine, and Sn-HLine of the adolescent patients in two groups after treatment were decreased (P<0. 05 or P<0.01); B' LL-FH was increased (P<0. 01); there were no significant differences in the difference values (T2 - Tl) of measurement indexes in the soft and hard tissues of the adolescent patients in two groups (P>0. 05). Conclusion: The changes of soft and hard tissue profiles of the adolescent patients after treated with two different kinds of tooth extraction methods are not significant.
