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Chewing pattern analysis in TMD patients with and without internal derangement: Part I
T Kuwahara1, R W Bessette, T Maruyama
1Department of Fixed Prosthodontics, Osaka University, Faculty of Dentistry, Japan.
Cranio : the Journal of Craniomandibular Practice
|January 1, 1995
Summary
Temporomandibular joint (TMJ) internal derangement restricts chewing range of motion, while internal derangement without TMJ issues causes chewing irregularities. Specific chewing patterns were observed in TMJ internal derangement patients.
Area of Science:
- Biomechanical analysis of mastication
- Temporomandibular joint (TMJ) disorders
- Oral and Maxillofacial Surgery
Background:
- Temporomandibular disorders (TMD) encompass a range of conditions affecting the TMJ and masticatory muscles.
- Internal derangement (ID) of the TMJ is a common cause of TMD, characterized by displacement of the articular disc.
- Understanding chewing movement alterations is crucial for diagnosing and managing TMD patients.
Purpose of the Study:
- To investigate and compare chewing movement patterns in TMD patients with and without TMJ internal derangement.
- To differentiate the biomechanical characteristics of chewing in patients with unilateral TMJ internal derangement versus those without.
- To identify specific kinematic parameters that distinguish different TMD subgroups and normal subjects during mastication.
Main Methods:
- Analysis of the envelope of motion during chewing was performed.
- Participants included 103 TMD patients with unilateral internal derangement (ID group), 94 TMD patients without internal derangement (NID group), and 10 normal subjects.
- Quantitative analysis of numeric parameters and qualitative assessment of chewing patterns in frontal and sagittal planes were conducted.
Main Results:
- The ID group exhibited a significantly restricted range of motion compared to NID and normal groups.
- The NID group demonstrated significant chewing irregularity compared to ID and normal groups.
- ID group chewing patterns showed increased deviation to the non-chewing side (frontal plane) and a narrow anteroposterior pattern (sagittal plane).
Conclusions:
- TMJ internal derangement is associated with restricted chewing range of motion and distinct deviations in chewing patterns.
- TMD patients without TMJ internal derangement exhibit significant chewing irregularities.
- Chewing movement analysis provides valuable insights into the biomechanical consequences of TMJ internal derangement and other TMDs.