The purpose of the serial studies were to develop a three-dimensional reproduction for diagnosis and surgical therapy planning.
In the present study, the author devised the methd of making models reproduced through applying high resolutional computed tomography (GE CT/T).
Preliminary examinations were carried out on the CT numbers and on the measurement of CT film images for three-dimensional reproduction.
The results are summarized below:
1) There were few hourly changes of CT numbers.
2) At the interspace of the phantom teflon rod and water, CT numbers changed gradually because of the partial volume effect and the edge response. Although the true boundaries of the materials could be indentified with the median CT number of the two substances.
3) Setting up to 1, 000 on the window level and 1, 200 on the window width, the measurement value of the views of the phantom teflon rod which had been magnified 1.8 power coincided with the true size.
4) Supplementary examinations were carried out on the same methods using a pig mandible, and the results were affirmed.
The models were made of acrilic boards which the images of CT films were traced. Those boards were waxed up and trimmed in the boxies for three-dimensional reproduction by using cephalograms.
The reproducible accuracy of the completed models was satisfactory for use in the field of the maxillofacial surgery.

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