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Type: Journal article
Title: The role of the disk in sheep temporomandibular joint ankylosis
Author: Miyamoto, H.
Kurita, K.
Ogi, N.
Ishimaru, J.
Goss, A.
Citation: Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 1999; 88(2):151-158
Publisher: Elsevier Science
Issue Date: 1999
ISSN: 1079-2104
Statement of
Hizuru Miyamoto, Kenichi Kurita, Nobumi Ogi, Jun-Ichi Ishimaru, and Alastair N. Goss
Abstract: Objective. The purpose of this study was to determine the role of the disk in intraarticular ankylosis of the temporomandibular joint. Study design. Twelve adult sheep were divided into 2 groups. In group 1, removal of the temporal and condylar articular surfaces was performed on the right temporomandibular joint and the disk was maintained; in group 2, removal of the articular surfaces and diskectomy were performed on the right temporomandibular joint. One sheep from each group was killed just after surgery and 5 sheep from each group were killed at 3 months. The joints were examined radiologically, macroscopically, and histologically. The range of jaw movements was recorded preoperatively and at sacrifice. Results. Each of 2 sheep in group 2 had lost 4% of their body weight by 3 months; all of the other sheep maintained or increased their weight. The range of jaw motion to the right was significantly lower in group 2 than in group 1 (P < .01). In group 1, fibrous repair of the articular surface and regeneration of the condylar head was seen. In group 2, each of the joints showed a total fibrous ankylosis with some calcification. There was a statistically significant difference in radiologic score between the groups (P < .0001). Histologic scores for group 1 demonstrated significantly lower scores on the degree of ankylosis scale and degree of calcification scale (P < .0001). Conclusions. This study showed that the presence of the disk prevented the development of fibrous intraarticular ankylosis of the temporomandibular joint.
Keywords: Cartilage, Articular; Mandibular Condyle; Temporomandibular Joint; Animals; Sheep; Temporomandibular Joint Disorders; Ankylosis; Calcinosis; Fibrosis; Body Weight; Radiography; Range of Motion, Articular; Follow-Up Studies; Regeneration; Wound Healing; Temporomandibular Joint Disc
Rights: Copyright © 1999 Mosby, Inc.
RMID: 0030002977
DOI: 10.1016/S1079-2104(99)70109-5
Appears in Collections:Dentistry publications

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