Evaluation of maximum contact jaw position across three head postures using digital technology in TMD and Non-TMD patients
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Abstract
Objectives: To investigate how head posture affects maximum contact jaw position (MCJP) in patients with temporomandibular disorder (TMD) and non-TMD conditions, and to compare the subjective perception of MCJP with the actual measurements under various head postures.
Methods and Methods: This case-control study included 68 participants comprising both TMD (n=34) and non-TMD (n=34) patients. The evaluation of head postures included three positions: supine, normal upright, and alert feeding positions. To record MCJP, we utilized the Three shape® TRIOS 3 WIRE Pengrip and TRIOS Cart S1A systems. The data were analyzed using the Ceramill® program to assess the variations in MCJP across the three head positions in vertical, anteroposterior, and mediolateral directions. Additionally, we obtained participants’ perceptions regarding the differences in MCJP experienced during the three head positions.
Results: Patients with TMD and non-TMD did not exhibit significant differences in MCJP distance, except in the vertical direction, where the MCJP distance differences between the supine and alert feeding head positions were statistically significant (p=0.04). In both non-TMD and TMD patients, a significant relationship was found between their perceptions of head posture’s influence on MCJP and the actual digitally measured MCJP differences across all head positions and directions (p<0.05 all positions).
Conclusion: MCJP differs in varied head positions, particularly in the vertical dimension between supine and alert feeding postures, and these measurable differences align with participants’ perceptions in both TMD and non-TMD groups.
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