Mandibular Movement Characteristics of an Anterior Disc Displacement with Reduction.

Aims: According to the Research Diagnostic Criteria (J Craniomandib Disord 1992;6(4):301-355), an anterior disc displacement with reduction (ADD) is characterized by reciprocal clicking with the opening click occurring at a mouth opening at least 5 mm greater than that of the closing click. The aim of this study was to test whether the E-ram criterion of the RDC is characteristic for a click due to an ADD. Methods: From 30 participants with a unilateral ADD, recordings of mandibular movements with 6 degrees of freedom as well as joint sound recordings were made. The participants performed free open movements and loaded closing movements. Results: In 8 joints (27%), the 5-nnn criterion was not fulfilled. For 2 participants, the click while closing occurred with an even larger mouth opening than that while opening. Recordings of the condylar movements showed that the opening clicks occurred over a broad range of the opening movement, whereas all the closing clicks occurred just before the condyle reached its terminal position in the fossa. Conclusion: The 5-ram criterion of the RD C is not characteristic of all anterior disc displacements with reduction. [ABSTRACT FROM AUTHOR]