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Journal of Peking University(Health Sciences) ›› 2020, Vol. 52 ›› Issue (1): 144-151. doi: 10.19723/j.issn.1671-167X.2020.01.023

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Preliminary study on three digital analysis methods for analyzing the distribution and area of occlusal contacts

Ning XIAO,Yu-chun SUN,Yi-jiao ZHAO(),Yong WANG()   

  1. Center of Digital Dentistry, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
  • Received:2019-10-10 Online:2020-02-18 Published:2020-02-20
  • Contact: Yi-jiao ZHAO,Yong WANG E-mail:kqcadcs@bjmu.edu.cn;kqcadc@bjmu.edu.cn
  • Supported by:
    Supported by the General Program of National Natural Science Foundation of China(81870815);the National Key R&D Program of China(2018YFB1106903);the Key R&D Program of Ningxia Hui Autonomous Region(2018BEG02012)

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Abstract:

Objective: To analyze the distribution and area of occlusal contacts of clinical dental model using three kinds of digital analysis methods, to compare the results of these methods and traditional occlusal analysis method, and to further analyze the characteristics of each digital analysis method. Methods: A set of plaster models of normal subjects was selected. The models were scanned by lab scanner 3shape E4 and the files were exported in a stereolithography file format. In 3D analysis software Geomagic Studio 2013 and Geomagic Qualify 2013, the corresponding results of 3D occlusal contact distribution and occlusal contact area were obtained through three digital analysis methods: “3D color difference map method”, “point cloud analysis method”, and “virtual articulating paper method”. The occlusal contact distribution and occlusal contact area were also obtained by two traditional occlusal analysis methods: “silicone interocclusal recording material method” and “scanned articulating paper mark method”. A threshold of 100 μm was used to analyze the occlusal contacts and 100 μm was also the thickness of arti-culating paper used in this study. The results of these five different occlusal analysis methods were evaluated qualitatively and quantitatively. Results: The results of 3D occlusal contact distribution obtained by the above five methods were basically consistent. The total occlusal contact area obtained by 3D color difference map method, point cloud analysis method, virtual articulating paper method, silicone interocclusal recording material method and scanned articulating paper mark method were 133.10 mm 2, 142.08 mm 2, 128.95 mm 2, 163.31 mm 2, and 100.55 mm 2 respectively. There was little difference between the results of three digital analysis methods. The results of occlusal contact area obtained by the digital methods and the traditional methods were different. Conclusion: The three digital analysis methods can provide reliable and accurate analysis results of occlusal contact distribution and occlusal contact area of dental model. The results obtained by these methods can serve as references for the digital occlusal surface design of dental prosthesis and clinical occlusal analysis.

Key words: Bite force, Dental models, Dental occlusion, Imaging, three-dimensional

CLC Number: 

  • R783

Figure 1

The plaster models used in the study"

Figure 2

Digital models (A) and unified triangular mesh data (B)"

Figure 3

Flipping the normal of mandibular model (A), 3D color difference map (B), manually selecting the boundaries of colored areas (C), and the result of occlusal contacting area (D)"

Figure 4

Clipped mandibular model (A), the result of 3D deviation analysis (B), and occlusal contact distribution (C)"

Figure 5

Selecting the occluding-related area of mandibular model (A), establishment of “virtual articulating paper” model (B), and occlusal contact distribution (C)"

Figure 6

The mandibular model combined with ball markers and silicone interocclusal recording material (A), the result of superimposition (B), analyzing the thickness of silicone material (C), and occlusal contact distribution (D)"

Figure 7

The result of scanning the articulating paper marks (A) and occlusal contact distribution (B)"

Figure 8

The occlusal contact distribution obtained by five methods A, 3D color difference map method; B, point cloud analysis method; C, virtual articulating paper method; D, silicone interocclusal recording material method; E, articulating paper mark scanning method."

Table 1

Comparation of the occlusal contact area obtained by five methods /mm2"

Items Digital occlusal analysis methods Traditional occlusal analysis methods
3D color difference
map method		 Point cloud analysis method Virtual articulating paper method Silicone interocclusal recording material method Articulating paper mark scanning method
Occlusal contact area of anterior region 11.06 16.49 14.69 25.26 12.78
Occlusal contact area of posterior region 122.04 125.59 114.26 138.04 87.77
Occlusal contact area of left side 78.76 87.47 77.22 97.49 60.31
Occlusal contact area of right side 54.34 54.61 51.72 65.82 40.24
Total occlusal contact area 133.10 142.08 128.95 163.31 100.55
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