Reasons for Jaw Bone Loss and Deteriorationman pointing to his mouth smiling

The following are the most common causes for jaw bone deterioration and loss that may require a bone grafting procedure:

Tooth Extractions

When an adult tooth is removed and not replaced, jaw bone deterioration may occur. Natural teeth are embedded in the jaw bone and stimulate the jaw bone through activities such as chewing and biting. When teeth are missing, the alveolar bone, or the portion of the jaw bone that anchors the teeth in the mouth, no longer receives the necessary stimulation and begins to break down, or resorb. The body no longer uses or “needs” the jaw bone, so it deteriorates and goes away.

The rate that the bone deteriorates, as well as the amount of bone loss that occurs, varies greatly among individuals. However, most loss occurs within the first eighteen months following the extraction and will continue gradually throughout your life.

Diseased Teeth

The longer a nonvital, fractured, carious, or non-restorable tooth remains in the mouth, the more likely the body is to cause destruction of the bone around that tooth. This destruction can create a post-extraction bony defect that is difficult to treat.

Periodontal Disease

Periodontal disease is a chronic infection of the bone around the teeth that gradually destroys the support of your natural teeth. Once the destruction of the bone has progressed to a critical point, tooth mobility and tooth loss will occur. Unfortunately, in addition to the loss of teeth, there is also bone loss due to the destruction caused by the periodontal disease. 

Dentures/Bridgework

Unanchored dentures are placed on top of the gum line, but they do not provide any direct stimulation to the underlying alveolar bone. Over time the lack of stimulation causes the bone to resorb and deteriorate.

With bridgework, the teeth on either side of the appliance provide sufficient stimulation to the bone, but the portion of the bridge that spans the gap where the teeth are missing receives no direct stimulation. Bone loss can occur in this area.

Facial Trauma

When a tooth is knocked out or broken to the extent that no biting surface is left below the gum line, bone stimulation stops, which results in jaw bone loss. Some common forms of tooth and jaw trauma include: teeth knocked out from injury or accident, jaw fractures, or teeth with a history of trauma that may die and lead to bone loss years after the initial trauma.

Misalignment

Misalignment issues can create a situation in the mouth where some teeth no longer have an opposing tooth structure. The unopposed tooth can over-erupt, causing deterioration of the underlying bone.

Issues such as TMJ problems, normal wear-and-tear, and lack of treatment can also create abnormal physical forces that interfere with the teeth’s ability to grind and chew properly. Over time, bone deterioration can occur where the bone is losing stimulation.

Osteomyelitis

Osteomyelitis is a type of bacterial infection in the bone and bone marrow of the jaw. This infection leads to inflammation, which can cause a reduction of blood supply to the bone. Treatment for osteomyelitis generally requires antibiotics and the removal of the affected bone. A bone graft procedure may be required to restore bone function and growth lost during removal.

Tumors

Benign facial tumors, though generally non-threatening, may grow large and require the removal of a portion of the jaw. Malignant mouth tumors almost always spread into the jaw, requiring the removal of the affected section of the jaw. In both cases, reconstructive bone grafting is usually required to help restore normal function to the jaw. Grafting in patients with malignant tumors may be more challenging because treatment of the cancerous tumor generally requires removal of the surrounding soft tissues as well.

Developmental Deformities

Some conditions or syndromes are characterized by missing portions of the teeth, facial bones, jaw or skull.