[Comparative experimental study between longitudinal fracture and transverse fracture of mandibular condyle].
OBJECTIVE
To evaluate the secondary effect of childhood miniature pig longitudinal fracture and transverse fracture of mandibular condyle to Temporomandibular Joint (TMJ).


METHODS
Longitudinal and transverse fractures on condyle of 14 childhood miniature pigs were created respectively. After 3 and 6 months the TMJs were studied macroscopically and microscopically.


RESULTS
The transverse fracture of mandibular condyle brought about TMJ adaptive changes. There was no adhesion between disc and condyle. The longitudinal fracture led usually to bifid condyle deformity and adhesion between disc and condyle. Many fibroblasts and chondrocytes were seen in the adhesion between disc and condyle. Blood vessels and fatty degeneration appeared in the articular disc.


CONCLUSIONS
Two different types of childhood condylar fractures are apparently different in the aspects of secondary lesions on TMJ. It suggests that an evident correlation between mandibular condyle longitudinal fracture and TMJ ankylosis.
Yao
J
J
Department of Stomatology, Chinese PLA General Hospital, Beijing 100853.
Zhou
J
J
Hu
M
M
D000818:Animals; D008335:Mandibular Condyle / Q000293:injuries*; D008337:Mandibular Fractures / Q000473:pathology*; D013552:Swine; D013556:Swine, Miniature; D013704:Temporomandibular Joint / Q000293:injuries; D013705:Temporomandibular Joint Disorders / Q000473:pathology*