Prefabricated CAD CAM Allogeneic Ring Blocks in the Anterior Maxilla With Immediate Implantation

Dental implant failure remains a clinically significant challenge, with early failures typically attributed to insufficient osseointegration, surgical trauma, bacterial contamination, or micromotion during healing. In contrast, late failures are often associated with occlusal overload, peri-implantitis, or implant mispositioning.

These challenges have driven the adoption of allogeneic bone blocks, particularly those fabricated using computeraided design/computer-aided manufacturing (CAD/CAM) technology, which offer precise anatomical adaptation, reduced surgical time, and minimized complications compared to manual grafting techniques

Inclusion criteria

• Aged between 18 and 65 years.
• Both sexes.
• Patients presenting with anterior maxillary alveolar bone defects resulting from previous implant failure.
• Systemically healthy individuals, classified as American Society of Anesthesiologists (ASA) physical status I or II.
• Participants were either non-smokers or light smokers consuming fewer than 10 cigarettes per day.

Exclusion criteria

• Uncontrolled systemic conditions such as diabetes mellitus or osteoporosis.
• Pregnant or breastfeeding at the time of recruitment.
• Individuals with a history of head or neck radiation therapy.
• Cases in which insufficient bone volume for implant placement persisted following augmentation.