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[Limited mouth opening - what now?].

Andreas Worni1, Regina Mericske-Stern, Tateyuki Iizuka

  • 1Klinik für Zahnärztliche Prothetik, Zahnmedizinische Kliniken der Universität Bern, Bern Switzerland.

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|September 26, 2014
PubMed
Summary

This case report details a rare condition causing limited mouth opening due to masticatory muscle and bone changes. Surgical intervention offers good outcomes for this rare cause of restricted jaw mobility.

Keywords:
TrismusProcessus-coronoideus-HyperplasieKaumuskel-Aponeurosen-Hyperplasie«Square-mandible»-Konfiguration

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Anatomy
  • Pathology

Background:

  • Limited mouth opening, or trismus, can significantly impair quality of life and necessitate complex dental treatment.
  • A rare complex of symptoms involving masticatory structures can lead to severe, long-term restricted jaw mobility.

Observation:

  • A 28-year-old female presented with progressive, years-long limited mouth opening, impacting alimentation and dental care.
  • Clinical examination revealed a hyperplastic mandibular angle and marked masseter muscle hypertrophy.
  • Radiological findings showed thickened masticatory muscle aponeurosis and hyperplastic coronoid processes.

Findings:

  • The condition involves structural alterations of the mandible and masticatory muscles, specifically hyperplasia and hypertrophy.
  • Surgical options include masseter muscle reduction, aponeurectomy, coronoidectomy, and mandibular angle reduction.
  • A lack of uniform nomenclature complicates the clear identification of this condition.

Implications:

  • Prompt diagnosis and surgical treatment can restore function and improve patients' quality of life.
  • Long-term success is contingent upon consistent post-operative physical therapy.
  • Further research may lead to a standardized nomenclature for this rare condition.