B. Johansson et al., Volumetry of simulated bone grafts in the edentulous maxilla by computed tomography: an experimental study, DENTOMAX R, 30(3), 2001, pp. 153-156
Objective: To determine the precision of CT for calculating the volume of b
one grafts to the maxilla.
Methods: Plaster of Paris was used to simulate bone as onlay and inlay graf
ts to the maxillary alveolus and sinus in a dry skull. Two mm thick axial C
-P scans were obtained. The area of the graft on each slice was measured an
d volumes calculated according to the formula V-graft=Sigma of areas x the
thickness of each section, Scans were repeated with the skull at approximat
ely + 5 degrees and - 5 degrees to the horizontal plane and the calculation
s repeated, The real volume was calculated by the displaced water technique
, Precision was estimated as reliability coefficient.
Results: The reliability coefficients for the right and left inlay and the
onlay grafts were 0.97, 0.6 and 0.96 respectively.
Conclusion: Calculations of the volume of both inlay and onlay grafts to th
e maxilla from axial CT is precise.