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Articular Disc and Eminence Modeling after Experimental Relocation of the Glenoid Fossa in Growing Rabbits

Department of Orthodontics, Institute of Dentistry, University of Oulu, Aapistie 2, SF-90220 Oulu, Finland

T. Kantomaa

Department of Orthodontics, Institute of Dentistry, University of Oulu, Aapistie 2, SF-90220 Oulu, Finland

M. Tuominen

Department of Orthodontics, Institute of Dentistry, University of Oulu, Aapistie 2, SF-90220 Oulu, Finland

L. Salo

Department of Orthodontics, Institute of Dentistry, University of Oulu, Aapistie 2, SF-90220 Oulu, Finland

The articular surface of the glenoid fossa shows some analogy to the mandibular condyle, since the surface is covered by secondary cartilage, which makes the process more elastic than purely bony structures. The condylar cartilage has been shown to be responsive to alterations in load pressures, and this secondary type of cartilage is also able to increase its proliferative activity to a limited extent when the load pressure is altered. The aim here was to measure changes in proliferative activity and type II collagen secretion in the articular surface of the glenoid fossa after steady experimental posterior relocation of the fossa in the rabbit without actively interfering with normal masticatory action. The shape of the articular disc and interrelations of the joint components were measured macroscopically.

Twenty-four five-day-old rabbits underwent gluing of the interparietal, temporoparietal, and lambdoidal sutures. Three experimental and 3 control rabbits were injected with tritiated thymidine at 10, 15, 20, and 30 days and were killed after 2 h for histological, autoradiographic, and immunohistochemical examination. The total number of labeled cells in the proliferative layer near the articular eminence was higher in the experimental group, the difference being greatest in the 15-and 20-day-old rabbits.

Immunohistochemical examination revealed less staining for type II collagen on the postero-inf erior side of the eminence in the experimental group. The articular disc was flattened in the experimental group, and the elastic tissue bundle connecting the articular eminence and the anterior border of the disc was significantly narrower and longer.

Key Words: Cartilage • Cell Shape • Stress (Mechanical),Temporomandibular Joint • Type II Collagen.

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Journal of Dental Research, Vol. 73, No. 2, 536-543 (1994)
DOI: 10.1177/00220345940730020901


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