Bone Engineering of Maxillary Sinus Bone Deficiencies Using Enriched CD90+ Stem Cell Therapy: A Randomized Clinical...

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Oral and Maxillofacial Surgery

Background:

• Craniofacial bone defects pose challenges in reconstructive surgery.
• Stem cell therapy offers a promising avenue for bone engineering.
• Maxillary sinus augmentation is crucial for dental implant success.

Purpose of the Study:

• To evaluate the efficacy and safety of autologous stem cells (enriched with CD90+ and CD14+ cells) for maxillary sinus bone reconstruction.
• To compare outcomes between stem cell-loaded scaffolds and scaffolds alone in a randomized controlled trial.

Main Methods:

• Phase 1/2 randomized controlled trial involving 30 participants with maxillary sinus bone deficiencies.
• Transplantation of autologous stem cells onto a β-tricalcium phosphate scaffold versus scaffold alone.
• Clinical, radiographic, and histologic analyses at 4 months; implant placement and functional restoration.

Main Results:

• Higher bone density and improved bone volume fraction (BVF) in the stem cell group, particularly in severe defects (BVF 0.5 vs. 0.4).
• A positive correlation between CD90+ stem cell enrichment and regenerated bone BVF (r=0.56; p=0.05).
• Successful oral implant placement and restoration in all patients with no adverse events at 1-year follow-up.

Conclusions:

• Cell-based therapy with enriched CD90+ stem cells is safe and effective for maxillary sinus floor reconstruction.
• This approach enhances engineered bone quality, showing potential for broader craniofacial bone defect applications.
• The study provides evidence for accelerating and improving tissue-engineered bone regeneration.