[The influences on mandibular development after removing the outer cortex of mandibular body in childhood minitype pigs].
OBJECTIVE
To study the influences on mandibular development after removing the outer cortex of mandibular body in childhood minitype pig.


METHODS
Six childhood minitype pigs were selected as the experimental animals. The outer cortex of mandibular body measured as 3.0 cm x 1.5 cm was removed in one side, and the other side remained intact as the control. The changes of mandibular modality and occlusion relationship as well as the histological and biomechanical changes were studied 24 weeks after operation.


RESULTS
There was no obvious difference compared with the control side in the height of the mandibular ramus and the length of the mandibular body, However, lateral deviation occlusion was found in some animals. The body thickness was thinner than that of the control side, there were no obvious biomechanical and histological differences between the two sides.


CONCLUSIONS
There was less influence on the growth of mandibular bone after removing one side of the outer cortex of the mandibular body in childhood minitype pig. But further study should be done for the cause of the lateral deviation of the mandible in part of the animals.
Zhang
Zhi-Yong
ZY
Department of Craniomaxillofacial Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences, Peking Union Medical Collage, Beijing 100041, China.
Liu
Wei
W
Gui
Lai
L
Wang
Ji-Chang
JC
Tang
Xiao-Un
XU
Yu
Dong
D
Zheng
Zong-Mei
ZM
Song
Bin
B
D000818:Animals; D005260:Female; D008297:Male; D008334:Mandible / Q000254:growth & development* / Q000601:surgery; D008335:Mandibular Condyle / Q000601:surgery*; D010027:Osteotomy / Q000009:adverse effects*; D013552:Swine; D013556:Swine, Miniature