Mandible fracture


Mandibular fracture frequency by location[1]
Mandibular anatomy, lateral view.
Mandibular anatomy, medial view.
  • Always make sure that a unilateral fracture is not in fact bilateral
  • Presume an open fracture until intraoral examination shows otherwise
  • Favorable vs unfavorable based on whether musculature reduces or opens the fracture

Clinical Features

  • Malocclusion
  • Pain worsened by attempted movement

Differential Diagnosis

Maxillofacial Trauma


Non-displaced fracture of the mandible on CT.
3D CT reconstruction of mandible fracture, white arrow marks fracture, red arrow marks moderate displacement and open bite


  • Have patient bite on tongue blade and twist it
    • If mandibular fracture present patient should reflexively open mouth (cannot break blade)
      • Sn 95%, Sp 65%

Exam for concomitant injuries

  • Test for inferior alveolar and mental nerve injury
  • Intraoral exam to rule-out:
    • Sublingual hematoma (suggestive of occult mandible fracture)
    • Dental or alveolar ridge fracture
  • Condyle injury test
    • Place finger into external auditory canal and have patient open and close mouth
  • Check Stenson's duct for bleeding


If high-risk (e.g. positive bite-test)

  • Panorex is initial imaging study of choice (if available)
  • CT face or mandible if:
    • Suspected condyle fracture
    • Complex fracture
    • Multiple facial fractures


  • Consider Barton's bandage
    • Ace wrap over top of head and underneath mandible
  • Prophylactic antibiotics (treat all empirically as "open" fractures)


Admit (ENT, OMFS, Plastics) for:[2]

  1. Airway compromise (e.g when lying flat)
  2. Unable to tolerate POs or secretions
  3. Inadequate pain control
  4. Open and/or unstable fractures[3]
  • Otherwise may follow up as outpatient in 2-3 days

See Also


  1. Marius Pricop, Horațiu Urechescu, Adrian Sîrbu (Mar 2012). "Fracture of the mandibular coronoid process – case report and review of the literature". Revista de Chirurgie Oro-maxilo-facială și Implantologie (in Romanian). 3 (1): 1–4. ISSN 2069-3850. 58. Retrieved 2012-08-19.[permanent dead link]
  2. Trauma: A Comprehensive Emergency Medicine Approach,, eds. Erick Legome and Lee W. Shockley. Cambridge University Press 2011.
  3. Widell T et al. Mandible Fracture Treatment & Management. Oct 2016.