Histomorphometric evaluation of bone regeneration using allogeneic and alloplastic bone substitutes

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Critical-sized bone defects pose significant challenges in achieving spontaneous osseous healing.
• Allogeneic and alloplastic bone substitutes are explored to enhance bone regeneration.
• Evaluating the efficacy of demineralized bone matrix (DBM) gel and synthetic bone graft materials is crucial for clinical application.

Purpose of the Study:

• To evaluate and compare the bone regeneration potential of demineralized bone matrix (DBM) gel, calcium hydroxide (CaOH)-treated DBM gel, and synthetic bone graft materials (Norian CRS and Bone Source) in critical-sized calvarial defects in a rabbit model.

Main Methods:

• Critical-sized calvarial defects (15 mm x 17 mm) were created in 30 New Zealand White rabbits.
• Defects were treated with DBM gel, CaOH-treated DBM gel, Norian CRS, Bone Source, or left unfilled (control).
• Histomorphometric analysis and radiographic evaluation were performed at 6 and 12 weeks post-implantation to assess new bone formation.

Main Results:

• DBM gel significantly enhanced new bone formation at 12 weeks compared to control defects.
• CaOH-treated DBM gel did not show a significant difference in bone regeneration compared to DBM gel alone at 12 weeks.
• Norian CRS and Bone Source did not promote bone regeneration and were comparable to unfilled control defects.

Conclusions:

• DBM gel is an effective allogeneic bone substitute for promoting osseous healing in critical-sized calvarial defects.
• The addition of CaOH to DBM gel does not significantly improve its bone regenerative capacity in this model.
• Synthetic bone graft materials Norian CRS and Bone Source were ineffective in promoting bone regeneration in this study.