Space Maintenance Techniques in Oral Bone Augmentation: A Structured Review of Mechanisms, Clinical Outcomes, and Future Directions

Abstract Although bone augmentation is essential for restoring deficient alveolar ridges before implant placement, the critical role of space maintenance as a distinct surgical principle remains underrepresented in the literature. This review aims to provide a synthesis by evaluating the biomechanical mechanisms, clinical efficacy, and limitations of current space-maintenance techniques, including bone block grafting, the shell technique, titanium mesh, and the screw-tenting technique. First, we elucidate the fundamental mechanisms whereby a stabilized osteogenic space regulates the extracellular matrix, intracellular signaling, and protein expression to promote bone regeneration. Subsequently, we synthesize the clinical outcomes of each major technique and present summary data for several commonly used methods. Finally, we discuss emerging trends and future directions, focusing on personalized regenerative strategies, advanced biodegradable materials, and innovative surgical protocols. The primary conclusion is that space maintenance is evolving toward integrating iomaterial science and precision surgery to develop more predictable, patient-specific, nd minimally invasive bone augmentation systems. This review provides a comprehensive framework to guide clinical decision-making and future research in alveolar ridge reconstruction.