De novo bone formation underneath the sinus membrane supported by a bone patch: a pilot experiment in rabbit sinus...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Oral and Maxillofacial Surgery

Background:

• Sinus floor elevation is a common procedure in dental implantology.
• Bone substitutes and growth factors are used to enhance bone regeneration.
• Efficient delivery systems for bone morphogenetic proteins are crucial.

Purpose of the Study:

• To evaluate a new bone substitute combined with a collagen membrane (bone patch) for sinus floor elevation.
• To assess the bone patch as a carrier for recombinant human bone morphogenetic protein-2 (rhBMP-2).
• To investigate bone regeneration and mini-implant osseointegration in rabbits.

Main Methods:

• Sinus floor elevation was performed bilaterally in five rabbits.
• A plain bone patch (control) or an rhBMP-2-loaded bone patch (experimental) was placed.
• Micro-computed tomography and histologic analyses were conducted at 4 weeks.

Main Results:

• The rhBMP-2 loaded patch group showed significantly higher total augmented and mineralized bone volumes.
• Histometric analysis revealed significantly larger new bone areas and bone-to-implant contact ratios in the experimental group.
• The bone patch effectively supported the sinus membrane and facilitated bone regeneration.

Conclusions:

• The devised bone patch supports the sinus membrane and promotes bone regeneration.
• rhBMP-2 loaded onto the bone patch may accelerate multidirectional bone regeneration towards the implant.
• The bone patch shows potential as an effective carrier system for rhBMP-2 in bone regeneration.