Analysis of Variability in the Manufacture of Cr-Co Fixed Partial Dentures by Geometric Comparison

This article studies tridimensional adjustment of Cr-Co fixed partial dentures obtained with different manufacturing processes (CNC milling, laser metal sintering and lost-wax), making a special point of the most critical adjustment, the marginal fit. A model was obtained with the impression taken in the oral cavity of a patient. This model was digitalized, and serves as the reference for manufacturing fixed partial dentures using different manufacturing processes. This article proposes a method of comparing the original model with the fixed partial dentures. This comparison was carried out using commercial software, allowing dental technicians to obtain information which can identify errors and geometric discrepancies before the fixed partial denture is implanted in the patient.