Seating Accuracy of Printed Artificial Teeth in Complete Prostheses at Different Print Angles

Background: ۳D printers are widely utilized in dentistry for complete prostheses due to fast production, high accuracy, and personal customization.Although these printers have had a significant effect on improving the treatment and manufacturing of tools and prostheses, the techniques used in printing ۳D models are still unable to provide ideal quality in all applications, and many variables can affect the accuracy of ۳D printing models. The purpose of this study was to compare the difference in the seating accuracy of printed artificial teeth in the resin base cavities of complete prostheses at different print angles with the aim of reducing the created errors. Methods: First, a scan was prepared from the cast of a patient. Then, the teeth and prosthetic base were designed for a single toothless area, and a total of ۶۰ artificial teeth and bases were printed separately at three angles of ۰°, ۴۵°, and ۹۰°. The correct seating of these teeth in the base cavities was evaluated by re-scanning and checking in the software (Dental cad, exocad, GMBH, version ۳). Results: In the palatal region, the midpoint-to-midpoint (M.M.) and vertical measurement at a ۴۵° angle had the most accuracy, while in the cylinder-to-cylinder (C.C.) measurement, the highest accuracy was observed at a ۰° angle (P<۰.۰۰۱). In the buccal area, the M.M. measurement demonstrated the highest accuracy at a ۹۰° angle, the C.C. measurement at a ۰° angle, and the vertical measurement at a ۴۵° angle (P<۰.۰۰۱). Conclusion: Based on the findings, there was a significant difference with the gold standard for all printing angles in various measurements of the accuracy of tooth seating in the printed resin base.