Bone structure changes in iliac crest grafts combined with implants.

Area of Science:

• Oral and Maxillofacial Surgery
• Biomaterials Science
• Radiology

Background:

• Mandibular onlay grafts with implants undergo predictable radiographic density changes.
• Understanding graft remodeling and trabecular structure is crucial for long-term success.

Purpose of the Study:

• To evaluate bone structure changes following mandibular onlay grafting with simultaneous implant placement.
• To correlate radiographic density changes with alterations in trabecular bone architecture.

Main Methods:

• Utilized standardized extraoral radiographs of 16 mandibular sides.
• Employed the Carl Zeiss Vision KS 400 3.0 imaging system for bone structure analysis.
• Measured parameters including trabecular and cavity dimensions, endpoints, branching points, skeleton length, branch angle/direction, and texture.

Main Results:

• No significant differences in bone structure were observed relative to implant position.
• Early cortical changes indicated partial resorption and increased structural complexity.
• The graft's upper spongiosa showed bone formation throughout the first postoperative year, while the upper cortex exhibited progressive resorption in the later stages.

Conclusions:

• The employed radiographic technique effectively monitors bone graft architectural changes.
• Observed architectural modifications in the graft align with documented changes in bone density.