Mechanical analysis of the pattern of movement during retraction of maxillary incisors by space closing loop.
- Author:
Sang Hong MIN
1
;
Young Jooh YOON
;
Kwang Won KIM
Author Information
1. Department of Orthodontics, College of Dentistry, Chosun University, Korea.
- Publication Type:Original Article
- Keywords:
Finite Element Method;
Retraction;
Space closing loop
- MeSH:
Incisor*;
Tooth;
Tooth Movement;
Torque
- From:Korean Journal of Orthodontics
1995;25(2):143-152
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
This study was performed, by Finite Element Method, to evaluate the stress distribution on the periodontal tissue according to activation of the various closing loops and to predict the pattern of movement of maxillary incisors. At the same time, bull loop, key-hole loop, T-loop, combination loop and asymmetrical T-loop which were used for retraction of maxillary incisors was analysed by Finite Element Method. The following results were obtained. 1. Horizontal force wits the greatest in bull loop, the followed by key-hole loop, combination loop, T-loop and initial tooth movement exhibited uncontrolled tipping. 2. Horizontal force in asymmetrical T-loop compared to other closing loops was remarkably decreased, and the intrusive force on the incisors occurred. 3. As torque was increased, the moment was increased as a linear increment. 4. As moment was increased, initial movement of tooth changed to root movement from uncontrolled tipping.
