Quantitative evaluation of three-dimensional reconstruction accuracy of edentulous models in centric relation
10.3760/cma.j.issn.1002-0098.2014.06.012
- VernacularTitle:无牙颌模型正中关系位三维重建精度的定量评价
- Author:
Yuchun SUN
1
;
Hong LI
;
Yong WANG
;
Yongbo WANG
;
Peijun LYU
Author Information
1. 100081,北京大学口腔医学院·口腔医院口腔医学计算机应用中心 口腔修复教研室 口腔数字化医疗技术和材料国家工程实验室 卫生部口腔医学计算机应用工程技术研究中心
- Keywords:
Computer-aided design;
Jaw,edentulous;
Denture,complete;
Centric relation
- From:
Chinese Journal of Stomatology
2014;49(6):371-374
- CountryChina
- Language:Chinese
-
Abstract:
Objective To reconstruct the centric relation of upper and lower edentulous dental models with two methods,to compare the reconstruction accuracy of the vertical and horizontal distance,and to provide some references to computer aided design and computer aided manufacture for complete denture.Methods Dental models and rims made from five edentulous patients in clinical were obtained.Each model was stocked with 10 identical size positioning cylinders (20 cylinders on each pair models) on 5 side-surfaces of basement.Twelve center point pairs were paired between upper and lower models from 20 cylinder bottoms.The vertical and horizontal distances of 12 center point pairs were regarded as the evaluation items.Firstly,upper and lower models and rims were scanned separately.Then,models and rims (fixed in centric relation respectively with positioning articulator and rubber banding) were scanned.In software,all the data were registered to reconstruct centric relation based on common region.Digital models were measured with software tools,and real models were measured with a contact measurement arm.The differences of the homologous items between two methods were analyzed with paired-t test.Results The vertical distance errors for dental articulator positioning method was (0.356 ± 0.200) mm and that of the rubber band method was (0.382 ± 0.299) mm,and paired-t test between the two methods showed no significant differences(P ＞ 0.05).The horizontal errors were (0.010 ± 0.411) mm and (0.104±0.476) mm,and paired-t test showed significant differences (P ＜ 0.05).Conclusions Comparing with rubber band method,dental articulator positioning can significantly increases three-dimensional reconstruction accuracy of edentulous jaw gypsum models' horizontal relation.
