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A clinical study of changes in the volume of bone grafts in the atrophic maxilla
B Johansson1, A Grepe, K Wannfors
1Department of Surgical Sciences, Oral and Maxillofacial Surgery, Uppsala University Hospital, S 751 85 Uppsala, Sweden.
Objectives:
To evaluate the volumetric changes in bone grafts to the severely atrophic edentulous maxilla over 6 months.
Methods:
Ten edentulous patients received autogenous bone as buccal onlay grafts to the maxilla and bilaterally particulate bone grafts to the maxillary sinus. Two mm contiguous axial CT scans were obtained 1 to 2 weeks and 6 to 7 months postoperatively. The area of each graft was measured and the volume calculated according to the formula V(graft)=Sigma of areas x the thickness of each section.
Results:
The volume of the inlay and onlay grafts was reduced by an average of 49.5 and 47% respectively of the initial volume. The coefficient of variation was greater in the onlay group (0.79) compared with the inlay group (0.38).
Conclusions:
The volumetric changes in buccal onlay and sinus inlay grafts after 6 months of healing seem similar although there was a wide range in both groups.