Immunological responses to maxillary on-lay allogeneic bone grafts

Area of Science:

• Oral and Maxillofacial Surgery
• Regenerative Medicine
• Biomaterials Science

Background:

• Severely resorbed maxillae present significant challenges for dental implant rehabilitation.
• Allogeneic bone grafts offer a potential solution but raise concerns about immunogenicity.
• Osseointegration of titanium implants is crucial for functional restoration.

Purpose of the Study:

• To evaluate the efficacy and immunological response of allogeneic femoral head bone grafts combined with titanium implants for reconstructing severely resorbed maxillae.
• To assess the osseointegration rates and long-term stability of implants in this reconstructive context.

Main Methods:

• Four patients with severely resorbed maxillae received on-lays of allogeneic femoral head bone grafts and titanium implants (Brånemark System).
• Donors and recipients were matched for ABO/Rh blood groups.
• Immunological monitoring included autoantibody detection in peripheral blood and assessment of local inflammatory reactions. Graft biopsies were taken at 6 months.

Main Results:

• Bone graft biopsies at 6 months showed vital bone formation.
• After a mean follow-up of 19.5 months, 22 out of 23 implants achieved osseointegration.
• No significant autoantibodies were detected, and no local inflammatory responses were observed.

Conclusions:

• Allogeneic femoral head bone grafts can be safely used with titanium implants for reconstructing severely resorbed maxillae.
• This combined approach demonstrates successful osseointegration and lacks adverse immunological reactions.
• The study supports the use of allogeneic bone grafts as a viable option in complex maxillofacial reconstructions.