3038 Condylar shapes of normal TMJs and TMJs with disc displacement
Y.-J. CHEN1, L.M. GALLO2, and S. PALLA2, 1National Taiwan University Hospital, Taipei, Taiwan, 2University of Zurich, Switzerland

Objectives:, Condylar remodeling in the temporomandibular joint (TMJ) is supposed to maintain the equilibrium between shape and function. In a former study, we showed quantitatively a mediolateral deformation of anteriorly displaced TMJ discs (Chen et al., J Orofac Pain, 2001, in press). One of the causes of this deformation was hypothesized to be the mediolateral stress-field translation (Gallo et al., J Dent Res, 79:1740-1746,2000) with a possible uneven loading of the condyle in this dimension. Aim of this pilot study was therefore to evaluate a possible relationship between the mediolateral aspect of the condylar shape and the disc status. Material and Methods:, Transversal scout views, used for condylar axis determination, were selected from the image database of our clinic. We analyzed the images of 29 patients with 1) at least unilateral TMJ disc displacement, according to sagittal and corrected coronal scan series, and 2) with no image signs of osteoarthrotic changes. The condylar shape was judged as "convex" or "concave", the latter when the condyle was thinner in the middle, medially or laterally. The width between both condylar poles was also measured. Results:, A) Over the 35 pathological joints, 21 discs were partially and 14 completely displaced. B) The condylar shape of the TMJs with displaced discs was most frequently concave (p<0.01, chi-square test). C) The condylar width of the 23 normal TMJs did not differ from that of the contralateral pathological joints (paired t-test, p>0.1). Conclusion:, The condylar shape in TMJs with displaced discs was more frequently concave than in normal joints. The analysis of a larger sample size is needed to confirm this finding.

Seq #275 - TMJ - Structure and Function II
3:45 PM-5:00 PM, Friday, 8 March 2002 San Diego Convention Center Exhibit Hall C

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