Force system of teeth produced by utility arch and rocking-chair arch for the orthodontic treatment of deep overbite analyzed by finite element method
10.3969/j.issn.1001-3733.2014.06.013
- VernacularTitle:有限元法分析多用唇弓和摇椅弓在矫治深覆时的应力效应
- Author:
Tianshu LI
;
Hongyan LIU
- Publication Type:Journal Article
- Keywords:
Deep overbite;
Finite element method;
Rocking-chair arch;
Utility arch
- From:
Journal of Practical Stomatology
2014;(6):796-799
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To study the force system of teeth produced by utility arch and rocking-chair arch for the treatment of deep o-verbite.Methods:Finite element model of mandible,mandible teeth,edgewise brackets and arch was established,utility arch and rocking chair arch were applied respectively,the force direction and magnitude of molars and incisors was analyzed by ANSYS.Re-sults:When utility arch was used,incisors bear intrusive force and molars bear extrusive force.With the utility arch wire was giving intrusive force to canine,the intrusive force to incisors reduced,the extrusive force to the first molars increased.When adding the bracketed teeth,the intrusive force to incisors increased,but the extrusive force to the canines and the force direction of the molars changed.Conclusion:While the utility arch exerts intrusive pressing force to the canines,the intrusive force to the lateral incisors de-crease,therefore,pressing of canines shall be independently completed after completing pressing of incisors.Different application methods of rocking-chair arches will produce different force to teeth.With addition of teeth applied with rocking-chair arch,the force to lateral incisors and molars changes the most.
