Evaluating the accuracy of three-dimensional reconstruction of the intercuspal position for dentition casts aided by a mechanical appliance
10.3760/cma.j.issn.1002-0098.2016.08.013
- VernacularTitle:牙列模型咬合关系三维扫描重建辅助装置的精度评价
- Author:
Zhewen HU
1
;
Weiwei LI
;
Xinyue ZHANG
;
Baolin FAN
;
Yong WANG
;
Yuchun SUN
Author Information
1. 100081,北京大学口腔医学院·口腔医院口腔医学数字化研究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口腔数字医学北京市重点实验室
- Keywords:
Dental models;
Imaging,three-dimensional;
Intercuspal position;
Three-dimensional reconstruction
- From:
Chinese Journal of Stomatology
2016;51(8):501-504
- CountryChina
- Language:Chinese
-
Abstract:
Objective To develop a aided mechanical appliance for rapid reconstruction of three-dimensional(3D) relationship of dentition model after scanning and evaluation of its accuracy.Methods The appliance was designed by forward engineering software and fabricated by a high precision computer numerical control(CNC) system.It contained upper and lower body,magnetic pedestal and three pillars.Nine 3 mm diameter hemispheres were distributed equally on the axial surface of each pedestal.Faro Edge 1.8m was used to directly obtain center of each hemisphere(contact method),defined as known center.A pair of die-stone standard dentition model were fixed in intercuspal position and then fixed on the magnetic pedestals with low expansion ratio plaster.Activity 880 dental scanner was used to scan casts after the plaster was completely set.In Geomagic 2012,the centers of each hemisphere were fitted and defined as scanning centers.Scanning centers were aligned to known centers by reference point system to finish the 3D reconstruction of the intercuspal occlusion for the dentition casts.An observation coordinate system was interactively established.The straight-line distances in the X(coronal),Y(saggital),and Z(vertical) between the remaining 6 pairs of center points derived from contact method and fitting method were measured respectively and analyzed using a paired t-test.Results The differences of the straight-line distances of the remaining 6 pairs of center points between the two methods were X:(-0.05±0.10) mm,Y:(0.02±0.06) mm,and Z:(0.01 ± 0.05) mm.The results of paired t-test showed no significant differences(P＞0.05).Conclusions The mechanical appliance can help to reconstruct 3D jaw relation by scanning single upper and lower dentition model with usual commercial available dental cast scanning system.
