12 male and 3 female patients (nxA0;=xA0;15) between 47 and 84xA0;years of age (mean agexA0;=xA0;65) were selected in a prospective study. Both magnetic resonance and computed tomography data sets of the facial bones were collected. Two milled models per patient were prepared: one based on the MRI scan and one based on the CT scan. The milled models were compared in a coordinative surveying procedure within 7 representative distances using a tentative measurement method.
Difference values between CT and MRI based models ranged from 0.1xA0;mm to 5.9xA0;mm. On average MRI based models were smaller by 0.381xA0;mm (SD 1.176xA0;mm) than those on CT based. The accuracy of models based on MRI data was similar to those based on CT data. MRI based three dimensional milled models provide precise structure accuracy.