How Particulate Corticocancellous Autograft Design with Mesenchymal Stem Cell Seeding Impacts Peri-Implant Osteogenesis in Severe Maxillary Atrophy Cases: A Comprehensive Biological, Histological, and Clinical Literature Review

Abstract

Cavernous atrophy of the maxilla (Cawood Class V and VI) is a difficult anatomical and biological challenge to overcome for successful implant-supported oral rehabilitation. The progressive pneumatization of the maxillary sinus and the centripetal alveolar ridge resorption reduce the dimensions of the alveolar ridge and often result in a ridge height of less than 1–3 mm with a ridge width of less than 2 mm. Xenogeneic and synthetic bone substitutes have been well developed, but autogenous bone is still the standard of care because of its natural osteogenic, osteoinductive, and osteoconductive properties. Yet, traditional solid autogenous block grafts have significant biological drawbacks, such as slow vascularization, ischemic core necrosis and variable volumetric resorption. Particulate corticocancellous autografts (PCCA) on the other hand present a substantially larger specific surface area and a rapid sprouting of capillaries between the particles. In order to enhance the mineralization of the matrix and to achieve stable and predictable long-term osseointegration, regeneration approaches have progressed towards the use of combination of PCCA scaffolds and MSC seeding.
This literature study aims at assessing all morphometric and biomechanical design parameters of PCCA, such as particle size distribution, inter-particle void volume and porosity, when modified with MSCs from bone marrow, dental pulp, gingiva and adipose tissue. Critical regeneration endpoints include volumetric graft stability, bone-to-implant contact (%BIC), percentage of new bone formation (%NBF) and cumulative implant survival rate. An extensive literature search was conducted on major biomedical databases (up to 2026) to synthesize data on histomorphometric, micro-computed tomography (Micro-CT), and randomized clinical trial data.
The evidence shows that an optimum particle size range of 0.5 to 2.0 mm creates an inter-particle void volume range of 35% to 55% to enable full vascular penetration within 7 to 14 days. In contrast to unseeded autografts (12.0% – 18.5%), %NBF can reach 28.5% – 38.5% with the shortened healing period of 3 – 4 months after seeding with MSCs. Histomorphometric analysis shows that the %BIC value improves and approaches 78.5% to 68%, and the volume of graft resorption is decreased to less than 10% to 12% with stabilization using barrier membranes or titanium meshes. The cumulative implant survival rates in regenerated bone range between 96.8% and 98.5% during long term follow up periods. These results validate the use of the combination of PCCA and MSC seeding as a very effective regenerative strategy that leads to a more rapid maturation of the tissue and biological results superior to solid block autografts, and biomaterials without cells.