Cephalometric comparison of hard-tissue morphology between extraction and non-extraction orthodontic treatment in borderline cases
- VernacularTitle:临界病例拔牙与不拔牙矫治对牙颌面硬组织结构的影响
- Author:
Tianmin XU
;
Yan LIU
;
Wei HUANG
;
Jiuxiang LIN
- Publication Type:Journal Article
- Keywords:
Orthodontics,corrective;
Tooth extraction;
Nonextractional treatment
- From:
Journal of Peking University(Health Sciences)
2003;0(06):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To compare hard tissue morphology by cephalometric measurements between extraction and non extraction orthodontic treatment in borderline cases. Methods: The samples consisted of 33 cases selected as borderline cases by 5 orthodontic specialists. They were divided into 21 extraction cases (including 13 four first premolar extraction cases and 8 second premolar extraction cases) and 12 nonextraction cases by checking patients’ treatment records. Conventional cephalometric analysis was made to compare hard tissue structures before and after orthodontic treatment and the same comparison was made between two different extraction patterns. Results: No statistical difference was found on pretreatment hard tissue morphology between extraction and non extraction groups divided from borderline cases. The SNB angle of the four first premolars extraction group was smaller than that of the four second premolars extraction group by (4.0?1.3)?( P
