[Biomechanical study on 3-dimensional finite element model of simulated maxillary protraction after maxillary fissure repair].
OBJECTIVE
To determine the effect of simulated protraction after maxillary fissure repair on stress and shift of maxillary bone and to provide the scientific evidence for treatment of maxilla in patients with cleft lip and palate.


METHODS
Based on the establishment of 3-dimensional finite element model of maxilla with cleft lip and palate, we used ANSYS 10.0 software to simulate protraction, repair fissures of maxillary bone, and then analyzed the change of maxillary stress and shift.


RESULTS
The maxillary fissures could be enlarged by protraction without reparation of maxillary. Obvious motion was observed on the uninjured side, with 500 g/per lateral protraction and 30 degree protraction angle. The major principal stress and von Mises stress of craniofacial bone distributed evenly under protraction after fissure repair.


CONCLUSIONS
The maxillary fissures have an enlarged trend by protraction without repair.The protraction treatment benefits the development of maxillary bone after repairing maxillary fissure.
Department of Stomatology, Xiangya Hospital, Central South University, Changsha 410008, China. lyh8484123@126.com
Yonghua
Y
Lei
Xinchun
X
Jian
Biqiao
B
Ren
D001696:Biomechanical Phenomena; D002971:Cleft Lip / Q000628:therapy*; D002972:Cleft Palate / Q000628:therapy*; D005115:Extraoral Traction Appliances; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D008310:Malocclusion / Q000628:therapy; D008437:Maxilla / Q000502:physiology*; D063173:Retrognathia / Q000628:therapy