Bilateral TMJ disc positions were evaluated using MRI performed in the sagittal (maximum intercuspal and maximum-opening positions) and coronal (closed) planes using a 1.5-T MRI scanner (Philips Healthcare, Best, the Netherlands) with TMJ surface coils. The disc position was characterized as normal disc position, disc displacement with reduction (DDwR), and disc displacement without reduction (DDw/oR) according to the classification criteria for the disc position.15

Normal disc position was defined as the intermediate zone of the disc interposed between the condyle and articular eminence in both positions.

DDwR was defined as an anteriorly displaced disc when the posterior band of the disc was located anterior to the 11:30 o’clock position and the intermediate zone of the disc was anterior to the condylar head in the closed position. Additionally, the disc was reduced on full mouth opening.

DDw/oR was defined as an anteriorly displaced disc that was not reduced on full mouth opening.

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