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The International Journal of Adult Orthodontics & Orthognathic Surgery
(Published from 1986-2002)

Edited by Robert L. Vanarsdall, DDS and Raymond P. White, Jr, DDS, PhD

Continued by World Journal of Orthodontics.

ISSN 0742-1931

The International Adult Orthodontics & Orthognathic Surgery
Volume 16, Issue 3


Changes in the temporomandibular joint after mandibular lengthening with different rates of distraction

Shujuan Zou, DDS, Jing Hu, DDS, Dazhang Wang, DDS, Jihua Li, DDS, Zhenglong Tang, DDS

This study assessed the changes in the condyle after mandibular lengthening with 2 different rates of distraction (1 mm/day and 2 mm/day). Unilateral mandibular distraction was performed in 8 young adult goats. The animals were sacrificed 8 weeks after the completion of distraction, and the temporomandibular joint (TMJ) specimens were harvested and processed for histologic examination and histomorphometric analysis. Adaptive changes in the condyle were observed in the goats distracted at a rate of 1 mm/day, whereas degenerative alterations were found in those distracted at a rate of 2 mm/day. This study suggests that the TMJ is able to withstand the impact of distraction at a rate of 1 mm/day, but more rapid distraction may induce degeneration in the condylar cartilage. (Int J Adult Orthod Orthognath Surg 2001;16:221225)

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