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KembaraXtra-Medicine – Mandibular Fractures
Mandibular fractures most commonly result from a direct force to the jaw and represent the third most frequent facial fracture after nasal and zygomatic fractures. The angle of the mandible is the most commonly fractured site, followed by the condyle, molar, and mental regions, while fractures of the mandibular symphysis are rare due to its thickness. Because the mandible forms a ring-like structure, multiple fractures occur in more than half of cases, and bilateral fractures are particularly common in motor vehicle accidents. Open fractures are frequent, often presenting with lacerations of the overlying gingiva.
The etiology of mandibular fractures includes motor vehicle accidents, interpersonal violence, contact sports, and industrial injuries. Patients are frequently intoxicated at the time of injury, which may limit the accuracy of the clinical history. Associated injuries are common, especially facial and head lacerations and other facial fractures. In children younger than six years, mandibular fractures are uncommon and often present as greenstick fractures that may be managed conservatively with a soft diet. However, because mandibular fractures can damage permanent tooth buds and affect growth plates, pediatric patients should be referred to specialists experienced in managing children.
Clinically, patients may present with mandibular pain, facial asymmetry or deformity, dysphagia, malocclusion, trismus, and decreased range of motion of the temporomandibular joint. A grating sensation conducted to the ear may be reported. Gum lacerations, hematomas, or bleeding around teeth are common, and paresthesia of the lower lip or gums suggests injury to the inferior alveolar nerve. Physical examination may reveal step-offs, bony tenderness along the mandible, loose or missing teeth, ecchymosis of the floor of the mouth, deviation of the jaw with opening, or inability to open the mouth sufficiently. A positive tongue blade test, where the patient cannot hold or break a tongue depressor between the teeth, strongly suggests a mandibular fracture.
Diagnosis requires imaging, most commonly plain radiographs or a panoramic dental radiograph (panorex). Mandibular series views are best for evaluating the condyles and neck, while panorex imaging is superior for assessing the symphysis and body of the mandible. If a condylar fracture is suspected but not visualized, computed tomography of the condyles in the coronal plane should be obtained. A low threshold for facial bone CT is recommended when associated facial injuries are suspected. Missing teeth must always be accounted for, and a chest radiograph is required if aspiration is a concern. Cervical spine imaging should be performed when the neck cannot be clinically cleared.
The differential diagnosis includes mandibular contusions, mandibular dislocation, and isolated dental trauma. In cases of dislocation, the jaw deviates away from the side of dislocation, whereas with fracture it deviates toward the fractured side. Initial management focuses on airway protection and cervical spine stabilization, as up to 40% of patients have associated injuries that may be life-threatening. If oral intubation is not feasible, nasotracheal intubation may be performed unless facial injuries contraindicate it, in which case a surgical airway may be required.
Most mandibular fractures, except isolated condylar fractures, are considered open fractures due to mucosal or gingival disruption and require antibiotic coverage against oral anaerobes as well as tetanus prophylaxis. Analgesia is provided as needed. Definitive treatment usually involves reduction and fixation, either by wiring the jaws in occlusion for several weeks or by open reduction and internal fixation. Linear, nondisplaced, or greenstick fractures may be managed conservatively with a soft diet. Mandibular dislocations should be reduced with appropriate technique, often aided by muscle relaxants or local anesthesia.
Patients with significant displacement, open fractures, associated dental trauma, unreliable follow-up, or risk of airway compromise should be admitted for specialist care. Stable patients with nondisplaced, closed fractures may be discharged with analgesics, antibiotics if indicated, and instructions for a soft diet, with close follow-up by an oral or maxillofacial surgeon within two to three days. Early recognition of malocclusion, proper imaging of the condyles, prompt antibiotic therapy for open fractures, and accounting for missing teeth are essential to avoid complications.
Mandibular fractures most commonly result from a direct force to the jaw and represent the third most frequent facial fracture after nasal and zygomatic fractures. The angle of the mandible is the most commonly fractured site, followed by the condyle, molar, and mental regions, while fractures of the mandibular symphysis are rare due to its thickness. Because the mandible forms a ring-like structure, multiple fractures occur in more than half of cases, and bilateral fractures are particularly common in motor vehicle accidents. Open fractures are frequent, often presenting with lacerations of the overlying gingiva.
The etiology of mandibular fractures includes motor vehicle accidents, interpersonal violence, contact sports, and industrial injuries. Patients are frequently intoxicated at the time of injury, which may limit the accuracy of the clinical history. Associated injuries are common, especially facial and head lacerations and other facial fractures. In children younger than six years, mandibular fractures are uncommon and often present as greenstick fractures that may be managed conservatively with a soft diet. However, because mandibular fractures can damage permanent tooth buds and affect growth plates, pediatric patients should be referred to specialists experienced in managing children.
Clinically, patients may present with mandibular pain, facial asymmetry or deformity, dysphagia, malocclusion, trismus, and decreased range of motion of the temporomandibular joint. A grating sensation conducted to the ear may be reported. Gum lacerations, hematomas, or bleeding around teeth are common, and paresthesia of the lower lip or gums suggests injury to the inferior alveolar nerve. Physical examination may reveal step-offs, bony tenderness along the mandible, loose or missing teeth, ecchymosis of the floor of the mouth, deviation of the jaw with opening, or inability to open the mouth sufficiently. A positive tongue blade test, where the patient cannot hold or break a tongue depressor between the teeth, strongly suggests a mandibular fracture.
Diagnosis requires imaging, most commonly plain radiographs or a panoramic dental radiograph (panorex). Mandibular series views are best for evaluating the condyles and neck, while panorex imaging is superior for assessing the symphysis and body of the mandible. If a condylar fracture is suspected but not visualized, computed tomography of the condyles in the coronal plane should be obtained. A low threshold for facial bone CT is recommended when associated facial injuries are suspected. Missing teeth must always be accounted for, and a chest radiograph is required if aspiration is a concern. Cervical spine imaging should be performed when the neck cannot be clinically cleared.
The differential diagnosis includes mandibular contusions, mandibular dislocation, and isolated dental trauma. In cases of dislocation, the jaw deviates away from the side of dislocation, whereas with fracture it deviates toward the fractured side. Initial management focuses on airway protection and cervical spine stabilization, as up to 40% of patients have associated injuries that may be life-threatening. If oral intubation is not feasible, nasotracheal intubation may be performed unless facial injuries contraindicate it, in which case a surgical airway may be required.
Most mandibular fractures, except isolated condylar fractures, are considered open fractures due to mucosal or gingival disruption and require antibiotic coverage against oral anaerobes as well as tetanus prophylaxis. Analgesia is provided as needed. Definitive treatment usually involves reduction and fixation, either by wiring the jaws in occlusion for several weeks or by open reduction and internal fixation. Linear, nondisplaced, or greenstick fractures may be managed conservatively with a soft diet. Mandibular dislocations should be reduced with appropriate technique, often aided by muscle relaxants or local anesthesia.
Patients with significant displacement, open fractures, associated dental trauma, unreliable follow-up, or risk of airway compromise should be admitted for specialist care. Stable patients with nondisplaced, closed fractures may be discharged with analgesics, antibiotics if indicated, and instructions for a soft diet, with close follow-up by an oral or maxillofacial surgeon within two to three days. Early recognition of malocclusion, proper imaging of the condyles, prompt antibiotic therapy for open fractures, and accounting for missing teeth are essential to avoid complications.
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