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[Habitual mandibular dislocation in two patients with Parkinson's disease]
S Sayama1, K Fujimoto, N Shizuma
1Department of Neurology, National Sanatorium Ashikaga Hospital.
Rinsho Shinkeigaku = Clinical Neurology
|December 10, 1999
Summary
Mandibular dislocation is rare in Parkinson's disease (PD). Neck retroflexion in PD patients may cause recurrent jaw dislocation, treatable with early chin cap therapy.
Area of Science:
- Neurology
- Oral and Maxillofacial Surgery
Background:
- Parkinson's disease (PD) is a neurodegenerative disorder.
- Mandibular dislocation is an uncommon complication in PD patients.
Observation:
- Two PD patients (74-year-old female, 56-year-old male) presented with habitual mandibular dislocation.
- Both patients had advanced PD (Hoehn and Yahr stage V) and significant neck retroflexion and rigidity.
- Jaw dislocation occurred spontaneously and required significant force to reduce due to rigidity.
Findings:
- Unlike previous reports, no mandibular tremor was observed in these cases.
- Neck retroflexion was identified as a potential cause, leading to stretched suprahyoid muscles and wide mouth opening.
- This muscle imbalance is hypothesized to cause recurrent mandibular dislocation in PD patients.
Implications:
- Early intervention with chin cap therapy is recommended to prevent recurrent mandibular dislocation in PD patients.
- Understanding the biomechanical link between neck posture and jaw instability in PD is crucial.
- This highlights the importance of addressing non-motor symptoms and associated physical changes in PD management.