[Three-dimensional finite element model of maxillary protraction of the maxilla in patients with cleft lip and palate].
OBJECTIVE
To determine the effective rule of protraction in different directions,strains, and shifts of maxillary bone,and to supply the scientific data for treatment of the 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,ANSYS 10.0 software was used to simulate protraction,and then we analyzed the change of maxillary stress and shift in the same force of traction in different directions.


RESULTS
With 500 g per lateral protraction and the protraction angle from 20 degree to 45 degree,the maxillary shifted upward, forward, and outward, and the shape of maxillary plate bow showed internal shrinkage. There was a close relation between the internal shrinkage and the direction of protraction. The smaller the angle between the direction of protraction and the functional occlusion plane,the larger the internal shrinkage of tooth bow. The larger the angle between the direction of protraction and the functional occlusion plane,the smaller the internal shrinkage of tooth bow.


CONCLUSIONS
With protraction,the maxilla grows upward, forward, and outward, and the maxillary palate shinks internally. There is a close relation between the direction of protraction and the range of internal shrinkage.
Lei
Yong-hua
YH
Department of Stomatology, Xiangya Hospital, Central South University, Changsha, China. lyh8484123@126.com
Jian
Xin-chun
XC
Ren
Bi-qiao
BQ
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