title: Accuracy evaluation of a new three-dimensional reproduction method of edentulous dental casts, and wax occlusion rims with jaw relation.
abstract: 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.
authors.forename: Fu-Song
authors.initials: FS
authors.lastname: Yuan
authors.forename: Yu-Chun
authors.initials: YC
authors.lastname: Sun
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.forename: Pei-Jun
authors.initials: PJ
authors.lastname: Lü
mesh_terms: D000704:Analysis of Variance; D017076:Computer-Aided Design; D003779:Denture Design; D003824:Denture, Complete; D061827:Dimensional Measurement Accuracy; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007574:Jaw Relation Record; D007834:Lasers; D003765:Models, Dental; D009066:Mouth, Edentulous / Q000534:rehabilitation; D014885:Waxes
chemical_list: D014885:Waxes
references.citation: Hua Xi Kou Qiang Yi Xue Za Zhi. 2001 Aug;19(4):235-6
references.pmid: 12539729
references.citation: Shanghai Kou Qiang Yi Xue. 2012 Feb;21(1):31-5
references.pmid: 22431043
references.citation: J Dent Res. 1997 Nov;76(11):1799-807
references.pmid: 9372798
references.citation: Dent Mater. 2006 Jan;22(1):69-76
references.pmid: 16040117
references.citation: J Oral Rehabil. 1997 Jul;24(7):540-8
references.pmid: 9250843
references.citation: Zhonghua Kou Qiang Yi Xue Za Zhi. 1999 Nov;34(6):351-3
references.pmid: 11776877
references.citation: Front Med Biol Eng. 1989;1(2):119-30
references.pmid: 2486752
references.citation: Am J Orthod Dentofacial Orthop. 1996 Oct;110(4):365-9
references.pmid: 8876485
references.citation: Int J Comput Dent. 2002 Apr-Jul;5(2-3):165-76
references.pmid: 12680050
references.citation: Zhonghua Kou Qiang Yi Xue Za Zhi. 2001 Mar;36(2):139-42
references.pmid: 11812327
references.citation: Comput Methods Programs Biomed. 2009 Mar;93(3):266-72
references.pmid: 19038475
references.citation: Int J Prosthodont. 1994 Jan-Feb;7(1):17-21
references.pmid: 8179777
references.citation: Kokubyo Gakkai Zasshi. 1992 Mar;59(1):259-64
references.pmid: 1607825