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DEPARTMENT OF ORAL MEDCINE AND
RADIOLOGY
AJINS T A
CRI
Truisms is called – LOCK JAW
Spasms of the muscles of mastication resulting in the
inability to open the oral cavity ; often symptomatic of
pericoronitis.
Normal mouth opening males – 35-45mm.
Normal mouth opening females- 40-60mm.
 Most common:
-Impacted third molar.
-Removal of wisdom teeth.
- Removal of tonsil.
Less common:
- Radiation therapy to the face and neck.
- Tetanus.
- Myositis.
- Jaw nerve damage.
- Adhesion or scaring of the tissues around the jaw or
tongue.
- Muscle atrophy.
- Poor oral hygiene.
- tumors or cancer.
- Trauma to the jaw area.
- Diseases such as lupus and scleroderma.
TRISMUS can occur most commonly in the first 9 months
after radiation near the temporomandibular joint.
 Intra articular
1. Ankylosis
2. Arthritis synovitis.
3. Meniscus pathology.
Extra articular:
 INFECTION:
• Odontogenic
1. Pulpal
2. Periodontal
3. Pericoronal
• Non odontogenic
1. Tonsillitis
2. Tetanus
3. Meningitis
4. Brain abscess
5. Parotid abscess
 Trauma
1. Fractured mandible
2. Fracture zygomatic arch
3. Incorporation of foregion bodies.
 Dental treatment related
• Post extraction
• Local anesthetic injection.
 TMD
• Trauma to the TMJ due to wide and prolonged opening .
• Myofacial muscle spasm.
• Internal derangement.
 Tumors and oral care
1. primary and secondary tumors of epipharyngeal and parotid region,
jaws joint.
2. Submucous fibrosis
3. Myositis ossificans
 Drugs
1. Phenothiazine
2. Succinyl choline
3. Tricyclic antidepresent.
4. Metaclopramide
5. Halothane.
 Radiotherapy and chemotherapy
1. Osteoradionecrosis
2. Post radiation fibrosis
 Congenital
1. Hypertrophy of coronoid
2. Trismus-pseudo-camptodactyly syndrome.
 Miscellaneous
1. Hysteria
2. Lupus erythematous.
 Heat therapy
 Analgesics
 A soft diet, and ( if necessary)
 Muscle relaxants.
THANKYOU

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Causes of trismus

  • 1. DEPARTMENT OF ORAL MEDCINE AND RADIOLOGY AJINS T A CRI
  • 2. Truisms is called – LOCK JAW Spasms of the muscles of mastication resulting in the inability to open the oral cavity ; often symptomatic of pericoronitis. Normal mouth opening males – 35-45mm. Normal mouth opening females- 40-60mm.
  • 3.  Most common: -Impacted third molar. -Removal of wisdom teeth. - Removal of tonsil. Less common: - Radiation therapy to the face and neck. - Tetanus. - Myositis. - Jaw nerve damage. - Adhesion or scaring of the tissues around the jaw or tongue. - Muscle atrophy. - Poor oral hygiene.
  • 4. - tumors or cancer. - Trauma to the jaw area. - Diseases such as lupus and scleroderma. TRISMUS can occur most commonly in the first 9 months after radiation near the temporomandibular joint.
  • 5.  Intra articular 1. Ankylosis 2. Arthritis synovitis. 3. Meniscus pathology. Extra articular:  INFECTION: • Odontogenic 1. Pulpal 2. Periodontal 3. Pericoronal • Non odontogenic 1. Tonsillitis 2. Tetanus 3. Meningitis 4. Brain abscess 5. Parotid abscess  Trauma 1. Fractured mandible 2. Fracture zygomatic arch 3. Incorporation of foregion bodies.
  • 6.  Dental treatment related • Post extraction • Local anesthetic injection.  TMD • Trauma to the TMJ due to wide and prolonged opening . • Myofacial muscle spasm. • Internal derangement.  Tumors and oral care 1. primary and secondary tumors of epipharyngeal and parotid region, jaws joint. 2. Submucous fibrosis 3. Myositis ossificans  Drugs 1. Phenothiazine 2. Succinyl choline 3. Tricyclic antidepresent. 4. Metaclopramide 5. Halothane.
  • 7.  Radiotherapy and chemotherapy 1. Osteoradionecrosis 2. Post radiation fibrosis  Congenital 1. Hypertrophy of coronoid 2. Trismus-pseudo-camptodactyly syndrome.  Miscellaneous 1. Hysteria 2. Lupus erythematous.
  • 8.  Heat therapy  Analgesics  A soft diet, and ( if necessary)  Muscle relaxants.