Reasons for Jawbone Loss and Deterioration

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

Tooth Extractions

When you have a permanent tooth removed and it is not replaced, jawbone deterioration may occur. The jawbone embeds the natural teeth, which stimulate the jawbone through activities such as chewing and biting. When teeth are missing, the alveolar bone, or the portion of the jawbone 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 jawbone, so it deteriorates by a process known as disuse atrophy.

The rate the bone deteriorates, as well as the amount of bone loss that occurs, varies among individuals. However, most of the bone loss occurs within the first 18 months following the extraction, and continues throughout life.

Periodontal Disease

Periodontal diseases are ongoing infections of the gums that gradually destroy the support of your natural teeth. Periodontal disease affects one or more of the periodontal tissues: alveolar bone, periodontal ligament, cementum, or gingiva. While there are many diseases which affect the tooth-supporting structures, plaque-induced inflammatory lesions make up the majority of periodontal issues, and are divided into two categories: gingivitis and periodontitis. Even though gingivitis, the less serious of the two diseases, may never progress into periodontitis, it always precedes periodontitis. As a result, Dr. Noraian emphasizes the importance of good oral hygiene to attempt to control the progression of disease.

Dental plaque is the primary cause or etiology of gingivitis in genetically-susceptible individuals. Plaque is a sticky colorless film, composed primarily of food particles and various types of bacteria, which adhere to your teeth at and below the gum line. Plaque constantly forms on your teeth, even minutes after cleaning. Bacteria found in plaque produce toxins or poisons that irritate the gums. Gums may become inflamed, red, swollen, and bleed easily. If this irritation is prolonged, the gums separate from the teeth causing pockets (spaces) to form. If you neglect daily brushing and flossing, plaque can also harden into a rough, porous substance known as calculus (or tartar). This can occur both above and below the gum line.

Periodontitis is affected by bacteria that adhere to the tooth’s surface, along with an overly aggressive immune response to these bacteria. If gingivitis progresses into periodontitis, the supporting gum tissue and bone that holds teeth in place deteriorates. The progressive loss of the alveolar bone can lead to loosening and subsequent loss of teeth which in turn will give rise to disuse atrophy of the jawbone.

Dentures/Bridgework

Unanchored dentures are placed on top of the gum line, and therefore do not provide any direct stimulation to the underlying alveolar bone. Over time, the lack of stimulation causes the bone to resorb and deteriorate. Because this type of denture relies on the bone to hold them in place, people often experience loosening of their dentures and problems eating and speaking. Eventually, bone loss may become so severe that dentures cannot stay in place even with strong adhesives, and you may need to purchase a new set. Proper denture care, repair, and refitting are essential to maintaining oral health.

Some dentures have anchors which support them and help adequately stimulate the jawbone, therefore helping preserve it, see, All-on-Four.

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.
By completing a bone graft procedure, Dr. Noraian can restore bone function and growth, thereby halting the effects of poor denture care.

Trauma

If you have a tooth knocked out or broken to the extent that no biting surface is left below the gum line, bone stimulation stops, which results in loss of jaw bone. 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.

A bone grafting procedure would reverse the effects of bone deterioration, restoring function and promoting new bone growth in traumatized areas.

Misalignment

Teeth 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 bone is losing stimulation.

Osteomyelitis

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

Tumors

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

Developmental Deformities

Some conditions or syndromes that are considered birth defects are characterized by missing portions of the teeth, facial bones, jaw, or skull. Dr. Noraian may be able to perform a bone graft procedure to restore bone function and growth where it may be absent.

Sinus Deficiencies

When molars are removed from the upper jaw, air pressure, from the maxillary sinus air cavity, causes resorption of the bone that formerly held the teeth in place. As a result, the sinuses become enlarged, a condition called hyperpneumatized sinus.

This condition usually develops over several years, and may result in insufficient bone for the placement of dental implants. Dr. Noraian can perform a procedure called a “sinus lift” that can treat enlarged sinuses.