Relationships between temporomandibular joint disc displacements and condylar volume

Publication date: Available online 14 November 2017
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): Min-Seok Chang, Jeong-Ho Choi, Il-Hyung Yang, Jung-Sub An, Min-Suk Heo, Sug-Joon Ahn
Objectives.We aimed to assess the relationship between mandibular condylar volume and disc displacement status, in male and female adults.Study Design.We evaluated 122 temporomandibular joints in 61 subjects, using magnetic resonance imaging (MRI) and computed tomography (CT). MRI data were used to assign disk status as either normal disk position (NR), disk displacement with reduction (DDR), or disk displacement without reduction (DDNR). CT data were used to calculate total condylar volume and its components, cortical volume and trabecular volume. The relationships between condylar volume, and disk status, and gender were tested with two-way analysis of variance.Results.Condylar volumes significantly correlated with disc displacement, tending to decrease as displacement increased. There were significant differences in both total condylar volume and trabecular volume among the DD status (NR > DDR > DDNR), while cortical volume were significantly different only between NR or DDR and DDNR (NR, DDR > DDNR). The volume decreases associated with TMJ DD were found in both males and females, with greater decreases in men than in women as DD progressed.Conclusion.Condylar volumes are significantly associated with disc displacement status. Joints with non-reducing discs showed the smallest condylar volumes in both males and females.



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