Accuracy evaluation of a new three-dimensional reproduction method of edentulous dental casts, and wax occlusion rims with jaw relation

• Published in: International journal of oral science Vol. 5; no. 3; pp. 155 - 161
• Main Authors: Yuan, Fu-Song, Sun, Yu-Chun, Wang, Yong, Lü, Pei-Jun
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01.09.2013; Springer Nature B.V; Center of Digital Dentistry, Peking University School and Hospital of Stomatology&National Engineering Laboratory for Digital and Material Technology of Stomatology&Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health, Beijing, China; Nature Publishing Group
• Subjects: 631/553/2705; 631/61/54/990; Analysis of Variance; Computer-Aided Design; Dental Models; Dentistry; Denture Design; Denture, Complete; Dimensional Measurement Accuracy; Humans; Imaging, Three-Dimensional - methods; Jaw Relation Record; Lasers; Medicine; Mouth, Edentulous - rehabilitation; Oral and Maxillofacial Surgery; Original; original-article; Orthopedics; Surgical Orthopedics; Waxes; accuracy; complete denture; reverse engineering software; line laser scanner; computer-aided design/computer-aided manufacturing; jaw relation
• ISSN: 1674-2818; 2049-3169
• DOI: 10.1038/ijos.2013.49

The article introduces a new method for three-dimensional reproduction of edentulous dental casts,and wax occlusion rims with jaw relation by using a commercial high-speed line laser scanner and reverse engineering software and evaluates the method’s accuracy in vitro.The method comprises three main steps：（i）acquisition of the three-dimensional stereolithography data of maxillary and mandibular edentulous dental casts and wax occlusion rims;（ii）acquisition of the three-dimensional stereolithography data of jaw relations;and（iii）registration of these data with the reverse engineering software and completing reconstruction.To evaluate the accuracy of this method,dental casts and wax occlusion rims of 10 edentulous patients were used.The lengths of eight lines between common anatomic landmarks were measured directly on the casts and occlusion rims by using a vernier caliper and on the three-dimensional computerized images by using the software measurement tool.The direct data were considered as the true values.The paired-samples t-test was used for statistical analysis.The mean differences between the direct and the computerized measurements were mostly less than 0.04 mm and were not significant（P.0.05）.Statistical significance among 10 patients was assessed using one-way analysis of variance（P,0.05）.The result showed that the 10 patients were considered statistically no significant.Therefore,accurate three-dimensional reproduction of the edentulous dental casts,wax occlusion rims,and jaw relations was achieved.The proposed method enables the visualization of occlusion from different views and would help to meet the demand for the computer-aided design of removable complete dentures.