Mandibular Fracture: Causes, Symptoms & Treatment
A mandibular fracture is a break in the lower jawbone (mandible). It most commonly results from trauma and typically requires medical or surgical treatment.
Things worth knowing about "Mandibular fracture"
A mandibular fracture is a break in the lower jawbone (mandible). It most commonly results from trauma and typically requires medical or surgical treatment.
What is a Mandibular Fracture?
A mandibular fracture is a break in the mandible, the lower jawbone and the only movable bone of the facial skeleton. The mandible is a horseshoe-shaped bone that supports the lower teeth and connects to the skull via the temporomandibular joint (TMJ). Mandibular fractures are among the most common facial bone injuries and require thorough medical evaluation and appropriate treatment.
Causes
Mandibular fractures are most often caused by external force or trauma. The most common causes include:
- Motor vehicle accidents (cars, motorcycles, bicycles)
- Falls, especially in elderly individuals or during sports activities
- Physical assaults (direct blows to the jaw)
- Sports injuries (e.g., combat sports, football, ice hockey)
- Occupational accidents involving direct impact to the lower face
- Pathological fractures: In rare cases, pre-existing conditions such as tumors, cysts, or advanced osteoporosis can weaken the bone to the point where minimal force causes a fracture.
Classification and Common Fracture Sites
Mandibular fractures are classified according to their location on the bone. Common fracture sites include:
- Parasymphysis (lateral to the midline, very common)
- Condyle: fracture at or near the temporomandibular joint
- Angle (angulus mandibulae): often associated with impacted wisdom teeth
- Symphysis (midline of the lower jaw)
- Ramus (vertical branch of the mandible)
- Coronoid process (less common)
Fractures may be simple (single fracture line) or multiple. High-energy trauma often results in comminuted fractures with multiple fragments.
Symptoms
Typical signs and symptoms of a mandibular fracture include:
- Pain in the jaw area, worsened by chewing or opening the mouth
- Swelling and bruising (hematoma) over the jaw or chin
- Limited mouth opening or complete inability to open the mouth (trismus)
- Malocclusion: the teeth no longer meet properly when biting
- Numbness or tingling of the chin or lower lip (due to involvement of the inferior alveolar nerve)
- Abnormal mobility of jaw segments or a palpable step deformity along the bone
- Bleeding from the mouth or from an open wound
- Difficulty speaking or swallowing
Diagnosis
Diagnosis is established through clinical examination and imaging:
- Physical examination: palpation for tenderness, step deformity, and abnormal mobility; assessment of occlusion and mouth opening
- Orthopantomogram (OPG): panoramic X-ray of the entire jaw – often the first imaging method used
- Computed tomography (CT): particularly valuable for complex, multiple, or condylar fractures; today considered the gold standard in trauma imaging
- 3D CT reconstruction: enables precise surgical planning
Treatment
Treatment depends on the severity, location, and type of fracture, as well as the overall health of the patient.
Conservative Treatment
For non-displaced fractures without functional impairment, conservative management may be sufficient:
- Soft or liquid diet to reduce strain on the jaw
- Pain relievers and anti-inflammatory medications
- Intermaxillary fixation (IMF): wiring or banding the upper and lower jaw together for several weeks to immobilize the fracture
Surgical Treatment
For displaced, unstable, or open fractures, surgery is usually required:
- Open reduction and internal fixation (ORIF): surgical realignment of bone fragments and fixation using titanium plates and screws
- Miniplate osteosynthesis: the standard procedure in oral and maxillofacial surgery
- Condylar fractures may be managed conservatively or surgically, depending on severity and displacement
Follow-up and Rehabilitation
Regular follow-up examinations are essential after treatment. Physiotherapy and targeted jaw exercises help restore full function. Healing time is typically 4 to 8 weeks, and may be longer for complex fractures.
Possible Complications
- Malunion resulting in permanent malocclusion
- Infection (particularly in open fractures or fractures involving teeth)
- Permanent nerve damage with lasting numbness
- Temporomandibular joint problems following condylar fractures
- Restricted mouth opening (trismus)
References
- Neff A et al.: S2k guideline: Fractures of the mandible. German Society of Oral and Maxillofacial Surgery (DGMKG), 2017. Available at: www.awmf.org
- Ogundare BO, Bonnick A, Boulis NM: Mandibular fracture epidemiology. J Oral Maxillofac Surg. 2003;61(9):1037–1042. PubMed PMID: 12966483.
- Ellis E 3rd: Outcomes of patients with teeth in the line of mandibular angle fractures treated with stable internal fixation. J Oral Maxillofac Surg. 2002;60(8):863–865. PubMed PMID: 12149726.
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