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Alveolar Bone – Function, Structure & Diseases

The alveolar bone is the part of the jaw that surrounds and supports the tooth roots. It is a key component of the periodontium and essential for dental stability.

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Things worth knowing about "Alveolar bone"

The alveolar bone is the part of the jaw that surrounds and supports the tooth roots. It is a key component of the periodontium and essential for dental stability.

What Is the Alveolar Bone?

The alveolar bone (Latin: os alveolare) is a specialized section of the upper and lower jaw that forms the bony sockets – known as alveoli – in which the tooth roots are anchored via the periodontium (the tooth-supporting apparatus). It is one of the most critical structures for tooth stability and normal dental function.

Structure of the Alveolar Bone

The alveolar bone consists of two main components:

Cortical bone plate: The dense outer layer that forms the external boundary of the bone.
Cancellous bone (spongiosa): The inner, sponge-like network that provides both strength and flexibility.

The innermost layer, which lies directly adjacent to the tooth root, is called the lamina dura and appears as a bright white line on X-rays. The alveolar bone is connected to the root cementum of the tooth via thin connective tissue fibers known as Sharpey fibers.

Function of the Alveolar Bone

The alveolar bone serves several essential functions:

Anchoring and stabilizing the teeth within the jaw
Transmitting and absorbing chewing forces
Protecting the tooth roots from mechanical stress
Supporting chewing function and speech production

Diseases of the Alveolar Bone

The alveolar bone can be damaged by various diseases and factors:

Periodontitis

The most common cause of alveolar bone loss is periodontitis, a bacterial inflammation of the periodontium. Bacteria and the body's own immune response gradually break down the bone, which can ultimately lead to tooth loosening and tooth loss.

Bone Loss After Tooth Extraction

After a tooth is lost, the surrounding alveolar bone resorbs due to the absence of mechanical stimulation. This process is called bone atrophy and can complicate subsequent dental implant placement.

Other Causes

Trauma (injuries to the jaw area)
Metabolic conditions such as osteoporosis
Radiation therapy to the head and neck region
Chronic inflammatory processes

Diagnosis

Assessment of the alveolar bone is primarily carried out using imaging techniques:

X-rays (e.g., panoramic radiograph, digital volume tomography – DVT/CBCT): These allow visualization of bone levels and detection of bone resorption.
Periodontal charting: Measurement of pocket depths to indirectly assess bone levels.

Treatment and Bone Regeneration

Depending on the extent of bone loss, various treatment options are available:

Periodontal therapy: Professional dental cleaning and subgingival debridement to eliminate the source of inflammation.
Bone augmentation: Application of bone substitute materials or autologous bone to restore alveolar bone volume before or during implant placement.
Guided bone regeneration (GBR): Use of membranes to promote bone growth and support the integration of bone substitute materials.
Implantology: Placement of titanium implants in sufficient native or augmented alveolar bone.

References

Rateitschak, K.H. et al. – Periodontology. Thieme Verlag, Stuttgart, 4th edition, 2012.
Wolf, H.F., Rateitschak, E.M., Rateitschak, K.H. – Color Atlas of Dental Medicine: Periodontology. Thieme Verlag, Stuttgart, 2004.
German Society of Periodontology (DG PARO) – S3 Clinical Guideline on Treatment of Periodontitis Stage I–III. AWMF, 2020. Available at: www.awmf.org

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