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Dentomaxillofacial Radiology, Vol 30, Issue 3 153-156, Copyright © 2001 by British Institute of Radiology

ARTICLES

Volumetry of simulated bone grafts in the edentulous maxilla by computed tomography: an experimental study

B. Johansson, A. Grepe, K. Wannfors, P. Aberg and J. M. Hirsch
Department of Surgical Sciences, Oral and Maxillofacial Surgery, Uppsala University Hospital, S 751 85 Uppsala, Sweden.

OBJECTIVE: To determine the precision of CT for calculating the volume of bone grafts to the maxilla. METHODS: Plaster of Paris was used to simulate bone as onlay and inlay grafts to the maxillary alveolus and sinus in a dry skull. Two mm thick axial CT scans were obtained. The area of the graft on each slice was measured and volumes calculated according to the formula V(graft)=Sigma of areas x the thickness of each section. Scans were repeated with the skull at approximately +5 degrees and -5 degrees to the horizontal plane and the calculations 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 the maxilla from axial CT is precise.




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