Comparison of finite element analysis of the closing patterns between first and second premolar extraction spaces.
- Author:
Shin Ae KOH
1
;
Won Hee IM
;
Sun Hyung PARK
;
Youn Sic CHUN
Author Information
1. Department of Orthodontics, School of Dentistry and Dental Research Institute, Seoul National University.
- Publication Type:Original Article
- Keywords:
FEA;
Premolar extraction;
Space closure;
Rotation
- MeSH:
Bicuspid*;
Finite Element Analysis*;
Tooth;
Tooth, Artificial
- From:Korean Journal of Orthodontics
2007;37(6):407-420
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
OBJECTIVE: The aim of this study was to compare the differences in closing extraction spaces between maxillary first premolar and second premolar extractions using 3-dimensional finite element analysis (FEA). METHODS: Maxillary artificial teeth were selected according to Wheeler's dental anatomy. The size and shape of each tooth, bracket and archwire were made from captured real images by a 3D laser scanner and FEA was performed with a 10-noded tetrahedron. A 10 degrees gable bend was placed behind the bull loop on a 0.017" x 0.025" archwire. The extraction space was then closed through 12 repeated activating processes for each 2 mm of space. RESULTS AND CONCLUSIONS: The study demonstrated that the retraction of anterior teeth was less for the second premolar extraction than for the first premolar extraction. The anterior teeth showed a controlled tipping movement with slight extrusion, and the posterior teeth showed a mesial-in rotational movement. For the second premolar extraction, buccal movement of posterior teeth was highly increased.
