Accuracy of integration of dental casts in three-dimensional models

Purpose: This study investigated errors occurring in three-dimensional (3D) models when plaster dental casts are integrated into them. Materials and Methods: Three-dimensional milling models of three patients w ith a jaw deformity were fabricated using the Endoplan system (SPARC Intern ational Inc, Santa Clara, CA). After this, plaster dental casts were integr ated into the 3D models using a face-bow transfer system. Two cephalograms were then compared, one obtained from the patient and the other obtained fr om the 3D model painted with contrast medium. Results: In two cases, the reproducibility of the dental position as determ ined by angle analysis was within 2 degrees, and that determined by distanc e analysis was within 2 mm. However, errors over 4 degrees and 4.2 mm, resp ectively, were observed in one case. Conclusion: It is clinically important to confirm the accuracy of the 3D mo del by cephalometric analysis, and it may be necessary to reposition the de ntal model based on the results.