Prediction of optimal bending angles of a running loop to achieve bodily protraction of a molar using the finite element method / 대한치과교정학회지
The Korean Journal of Orthodontics
;
: 3-10, 2018.
Article
Dans Anglais
| WPRIM
| ID: wpr-919222
ABSTRACT
OBJECTIVE@#The purpose of this study was to predict the optimal bending angles of a running loop for bodily protraction of the mandibular first molars and to clarify the mechanics of molar tipping and rotation.@*METHODS@#A three-dimensional finite element model was developed for predicting tooth movement, and a mechanical model based on the beam theory was constructed for clarifying force systems.@*RESULTS@#When a running loop without bends was used, the molar tipped mesially by 9.6° and rotated counterclockwise by 5.4°. These angles were almost similar to those predicted by the beam theory. When the amount of tip-back and toe-in angles were 11.5° and 9.9°, respectively, bodily movement of the molar was achieved. When the bend angles were increased to 14.2° and 18.7°, the molar tipped distally by 4.9° and rotated clockwise by 1.5°.@*CONCLUSIONS@#Bodily movement of a mandibular first molar was achieved during protraction by controlling the tip-back and toe-in angles with the use of a running loop. The beam theory was effective for understanding the mechanics of molar tipping and rotation, as well as for predicting the optimal bending angles.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Type d'étude:
Étude pronostique
langue:
Anglais
Texte intégral:
The Korean Journal of Orthodontics
Année:
2018
Type:
Article
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