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Mandible – Anatomy and Function of the Lower Jaw

The mandible is the lower jawbone of the human skull. It holds the lower teeth and is the only movable bone in the facial skeleton.

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Things worth knowing about "Mandible"

The mandible is the lower jawbone of the human skull. It holds the lower teeth and is the only movable bone in the facial skeleton.

What is the Mandible?

The mandible (from Latin mandibula) is the largest and strongest bone of the facial skeleton. It forms the lower jaw and is the only bone in the skull that can move. The mandible holds the 16 lower teeth (in the permanent dentition) and plays a central role in chewing, speaking, and swallowing.

Anatomical Structure

The mandible consists of several anatomical regions:

Body of the mandible (Corpus mandibulae): The horizontal part that contains the lower teeth in the alveolar process.
Ramus of the mandible (Ramus mandibulae): Two vertical bony plates that project upward from the body on each side.
Condylar process (Processus condylaris): Forms the temporomandibular joint (TMJ) with the temporal bone of the skull.
Coronoid process (Processus coronoideus): Provides attachment for the temporalis muscle.
Mandibular angle (Angulus mandibulae): The junction of the body and the ramus on each side.

Functions

As the only movable bone of the facial skeleton, the mandible serves several vital functions:

Chewing (Mastication): Jaw movements grind and break down food.
Speaking (Phonation): Jaw position and movement contribute to the production of speech sounds.
Swallowing (Deglutition): Mandibular movement supports the swallowing reflex.
Supporting the teeth: Lower teeth are anchored in the alveolar bone of the mandible.

The Temporomandibular Joint

The mandible articulates with the temporal bone on both sides via the temporomandibular joint (TMJ). This joint allows opening, closing, protrusion, and lateral grinding movements. Disorders of the TMJ are referred to as temporomandibular disorders (TMD) and can cause jaw pain, clicking sounds, headaches, and limited mouth opening.

Common Conditions and Injuries

Mandibular Fracture

A mandibular fracture is one of the most common facial skeletal injuries, typically resulting from trauma such as a punch, fall, or road accident. Symptoms include pain, swelling, malocclusion (misaligned bite), and restricted jaw movement. Treatment may be conservative or surgical depending on severity.

Osteonecrosis of the Jaw

Jaw osteonecrosis refers to the death of bone tissue in the mandible or maxilla. It can occur as a side effect of certain medications (e.g., bisphosphonates) or following radiation therapy to the head and neck region.

Jaw Cysts and Tumors

Benign cysts (e.g., dentigerous cysts, odontogenic keratocysts) or rare tumors can develop within the mandible, destroying bone tissue and requiring surgical intervention.

Jaw Misalignment

Abnormal positioning of the mandible, such as prognathism (protruding jaw) or retrognathism (receding jaw), can lead to chewing difficulties, snoring, or sleep apnea. Treatment options include orthodontics or orthognathic surgery.

Diagnosis

Several imaging methods are used to evaluate the mandible:

Panoramic radiograph (OPG): Standard X-ray showing the entire jaw
Cone beam computed tomography (CBCT/DVT): Three-dimensional imaging of the jaw bone
Computed tomography (CT): Used for complex fractures or tumors
MRI: Assesses soft tissues and the temporomandibular joint

Clinical Relevance in Dentistry

The mandible is of paramount clinical importance in dentistry and oral surgery. Dental implants, tooth extractions, nerve blocks (inferior alveolar nerve block), and surgical procedures all depend on a thorough understanding of mandibular anatomy. Implant planning after tooth loss is directly related to the quality and quantity of bone in the mandible.

References

Gray's Anatomy: The Anatomical Basis of Clinical Practice. Elsevier, 42nd edition, 2020.
Netter F.H.: Atlas of Human Anatomy. Elsevier, 7th edition, 2018.
Miloro M. et al.: Peterson's Principles of Oral and Maxillofacial Surgery. PMPH USA, 3rd edition, 2012.

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