A histomorphometric comparison of the bone graft-titanium interface between interpositional and onlay/inlay bone...

Area of Science:

• Oral and Maxillofacial Surgery
• Biomaterials Science
• Regenerative Medicine

Background:

• Severely atrophied maxillae pose challenges for dental implant restoration.
• Autogenous bone grafting is a common technique to augment deficient bone.
• Titanium microimplants (MIs) are used to support restorations in grafted bone.

Purpose of the Study:

• To compare the bone graft-implant interface of MIs placed simultaneously with bone grafting versus after a 6-month healing period.
• To evaluate MI integration in interpositional bone grafts (IBGs) versus onlay/inlay bone grafts (OBGs).

Main Methods:

• Histomorphometric analysis of 68 retrieved titanium MIs from 23 patients with atrophied maxillae.
• Comparison of MIs placed simultaneously with IBG or OBG versus MIs placed after 6 months of graft healing.
• Assessment of bone-implant contact (BIC), bone area in threads, and newly formed bone (NFB).

Main Results:

• Osseointegration was similar between IBG and OBG techniques.
• Delayed MI placement (after 6 months healing) showed significantly better BIC and NFB compared to simultaneous placement.
• MIs placed in non-grafted bone demonstrated superior bone fill and NFB than those in grafted bone.

Conclusions:

• The timing of implant placement is more critical for osseointegration than graft type or healing duration.
• Delayed placement of MIs following an initial 6-month healing period enhances implant integration.
• Improved revascularization of the bone graft likely contributes to better outcomes with delayed implant placement.