The success of dental implantation depends not only on the quality of the implant itself but also on the biological quality and volume of the bone surrounding it. After tooth loss, the alveolar bone atrophies because it no longer receives physiological stimulation, and research shows that alveolar bone width and height can be reduced by 40 to 60 percent after extraction. Bone regeneration, also known as bone augmentation, is intended to reverse that process.

Bone augmentation aims to restore missing bone and provide sufficient support for an implant. Common applications include:

• Post-extraction site preservation, using graft material to prevent alveolar bone atrophy.
• Repair of bone defects after trauma or infection.
• Peri-implant bone defects, such as bone resorption caused by peri-implantitis.
• Vertical and horizontal bone augmentation procedures.

When selecting a surgical plan, clinicians assess the nature of the defect and choose an appropriate bone substitute and technique, including whether to use a barrier membrane to guide bone growth.

Bone graft materials differ in origin, biological activity and clinical application. The main categories are summarized below.

Bone regeneration relies on three biological mechanisms: osteogenesis , which provides viable bone cells; osteoinduction , which stimulates stem-cell differentiation; and osteoconduction , which provides a scaffold for bone growth. An ideal bone substitute should degrade at a rate that matches bone metabolism, allowing new bone to grow in an orderly manner and mineralize as the material is resorbed.

Although bone augmentation techniques are well established, they are not suitable for every patient. The following conditions may affect bone metabolism and are considered relative contraindications:

• Poorly controlled diabetes.
• A history of head and neck radiation therapy.
• Long-term use of bisphosphonate medications.

A comprehensive medical evaluation is a prerequisite for ensuring safety and effectiveness before such surgery is performed.