The effect of extracapsular injuries on growth and development of the mandible condyle: an experimental study in growing dogs.

The effect of extracapsular injuries on growth and development of the mandible condyle: an experimental study in growing dogs.

Oral Surg Oral Med Oral Pathol Oral Radiol. 2016 Jun 11;

Authors: Liu S, Tian L, Ding M, Liu Y, Li G, Chen J, Ding Y

Abstract
OBJECTIVE: To investigate the effects of condylar extracapsular injuries on the development of the mandibular condyle and try to find a way to treat condylar hyperplasia by electively using such injuries to restrict the overdeveloped mandibular condyle.
STUDY DESIGN: Sixty 6-month-old beagle puppies were divided randomly into five groups: blank control; unilateral fracture to the condylar neck; unilateral fracture to the condylar neck treated with rigid internal fixation; unilateral periosteum injury; unilateral decortication of the condylar neck. Computed tomography, (99 m)Tc single-photon emission computed tomography, and tetracycline-calcein double-labeling were performed after surgery. The puppies were sacrificed 12 and 24 weeks after surgery. Morphologic analyses and examination of growth activity were done.
RESULTS: Unilateral fracture of the condylar neck without fixation caused local morphologic changes during the early postoperative period, but compensatory growth of the condyle altered such changes after healing. The other types of injury failed to inhibit the growth of the condyle and the mandible, whereas functional deviation of the chin was found after unilateral fracture of the condylar neck with or without fixation.
CONCLUSIONS: The four types of extracapsular injury described here failed to inhibit the growth of the mandibular condyle and could not be selected as alternatives to treat condylar hyperplasia.

PMID: 27527388 [PubMed - as supplied by publisher]

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