Comparative evaluation of the accuracy and cost-effectiveness of rapid-prototyped orthodontic models 3D printed in vertical and horizontal orientations: An in-vitro study

Abstract

Abstract Objectives: The purpose of this study was to evaluate the accuracy and cost-effectiveness of the rapid-prototyped dental models 3D printed in vertical and horizontal orientation as compared to the gold standard conventional plasterand digital models. Methods: This in vitro study involved scanning of 50 plaster dental models (25 maxillary and 25 mandibular) using Maestro 3D Desktop Scanner (AGE Solutions, Pisa, Italy). The STL file obtained from the scanner was processed and three-dimensional (3D) printed in the horizontal and vertical orientation using a polyjet 3D printer (Objet 30 prime, Stratasys Ltd., Eden Prairie, Minnesota, United States). The accuracy of the rapid-prototyped (3D printed) models were measured from the pre-determined landmarks and were compared among the groups. In addition, the determination of the cost-effectiveness of the 3D printed models in different orientations was based on the amount of material (resin) utilized during the 3D printing process. Results: There were statistically insignificant differences (P>0.05) among rapid-prototyped models, plaster models, and digital models for the linear measurements made in all three planes of space with excellent reliability (ICC > 0.804), and internal consistencies (Cronbach’s alpha > 0.910). The dental models printed in the horizontal orientation were found more cost-effective as compared to models printed in a vertical orientation in terms of the amount of material (resin) utilized and printing time during the 3D printing process. Conclusion: There was no significant difference in terms of accuracy between the rapid-prototyped models 3D printed in the horizontal and vertical orientation. Horizontally printed models were more cost-effective than vertically printed models.