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J Dent Res 46(3): 483-491, 1967
© 1967 International and American Associations for Dental Research
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Histologic Study of Regeneration of the Mandibular Condyle After Unilateral Condylectomy in the Rat

ARTHUR M. HAYES 1

1 Vancouver, British Columbia, Canada

The investigation of the regeneration of the mandibular condyle in the rat is based on serial sections through the region of the squamosomandibular articulation of 8 rats on which unilateral condylectomy was performed. Unilateral condylotomy was performed on an additional rat. In each rat, the side of mandible that was not operated on served as a histologic control.

Regeneration of the mandibular condyle occurred in 6 of 8 rats. Condylar regeneration was explained in terms of the tissue from which the condyle normally arises; namely, the chondrogenic layer. This, in the presence of the articular disc, allowed the regeneration to conform to the normal anatomic outline. The development regenerating condyle was comparable with that of a normal rat at the postoperative age. Infection did not prevent the regenerative process.

In the 2 rats in which regeneration failed to occur, histologic study showed the absence of the articular capsule and the articular disc. This was thought to be significant, since it was evident that the operative procedure was more radical; the entire condyle, together with the chondrogenic layer and the articular capsule, was removed. When regeneration failed, the severed end of the ramus was rounded and slender and the squamosomandibular fossa was moderately to severely atrophied.

Massive callus formation occurred at the severed end of the ramus and was considered to be part of a healing process common to fractures of bone. This allowed for the eventual union of the ramus with the regenerating condyle.

Union of the severed end of the ramus with the neck of the condyloid process occurred in the rat on which unilateral condylotomy was performed.

Submitted on February 25, 1965




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S. Zhu, J. Hu, S. Zou, K. Kakudo, and M. Tsunokuma
Biomechanical Properties of the Condyle Created by Osteodistraction
J. Dent. Res., May 1, 2008; 87(5): 490 - 494.
[Abstract] [Full Text] [PDF]


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