Imaging Study on Effect of Abnormal Mandibular Position Caused by Increased Vertical Dimension and Loss of Occlusion on Condyle of Adult Rats

doi:10.13701/j.cnki.kqyxyj.2025.03.004

Abstract

Abstract: Objective: To study the imaging changes of the anterior and posterior condyle at different time and mandibular positions. Methods: Three animal models, i.e.control group, increased vertical dimension group, and loss of occlusion group were constructed. The general changes of condylar process of rats were observed under stereomicroscope at 1 W, 2 W, 4 W, and 8 W respectively, and the subchondral morphological parameters of subchondral bone in the anterior and posterior parts of condylar process of rats were analyzed by Mirco CT. Results: Compared with the control group, there was no significant change in the subchondral morphological parameters of the anterior condylar bone in the increased vertical dimension group in the early stage, and bone resorption occurred at 8 W; however, bone was graduallycompensated since 2 W in the loss ofocclusion group.The condylar posterior subchondral bone in the increased vertical dimension group showed bone compensation in the early stage, and there was no significant difference compared with the control group at 8 W. In the loss of occlusion group, bone compensation occurred at all time periods. Conclusion: When the vertical distance increases or decreases, the subchondral bone of the rat condylar cartilage undergoes bone remodeling, but the degree and location of bone remodeling are not exactly the same.

Key words: condyle, subchondral bone, vertical distance, loss of occlusion

WANG Yue, GENG Wei. Imaging Study on Effect of Abnormal Mandibular Position Caused by Increased Vertical Dimension and Loss of Occlusion on Condyle of Adult Rats[J]. Journal of Oral Science Research, 2025, 41(3): 195-199.

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