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Journal of Technologic Dentistry 2020; 42(4): 313-320
Published online December 30, 2020
https://doi.org/10.14347/jtd.2020.42.4.313
© Korean Academy of Dental Technology
교합면의 교모형태에 따른 치과용 모형 스캐너의 정확도 평가
김동연1, 김지환2, 이범일2, 이주희3, 김원수3, 박진영4
1폴드 치과기공소, 2고려대학교 일반대학원 보건과학과 치의기공전공, 3대전보건대학교 치기공과, 4스마일치과기공소
Accuracy evaluation of dental model scanner according to occlusal attrition type
Dong-Yeon Kim1 
, Ji-Hwan Kim2 , Beom-Il Lee2 , Ju-Hee Lee3 , Won-Soo Kim3 , Jin-Young Park4
14RD Dental Laboratory, Seoul, Korea
2Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Korea
3Department of Dental Lab Technology, Daejeon Health Institute of Technology, Daejeon, Korea
4Smile Dental Laboratory, Boeun, Korea
Correspondence to :
Dong-Yeon Kim
4RD Dental Laboratory, 9 Sejong-daero 1-gil, Jung-gu, Seoul 04512, Korea
E-mail: kdy1713@korea.ac.kr
https://orcid.org/0000-0002-3670-8591
Purpose: The purpose of this study is to compare and analyze the accuracy of single crowns based on the type of occlusal surface.
Methods: A single crown wax pattern was fabricated in three types of occlusal surface. The prepared wax pattern was replicated with silicone, and stone was injected to create a stone model. The prepared specimens were scanned using a model scanner. Scans were classified into three groups, and each scan was performed six times to analyze the trueness and precision of a single crown. In addition, only the occlusal surface area was analyzed for trueness and precision. Data were analyzed using the Kruskal–Wallis H test, a nonparametric test (α=0.05).
Results: With regard to the trueness value of the occlusal scan area, the no occlusal tooth attrition (NA) group showed the largest error of 3.5 μm, and the complete occlusal tooth attrition (CA) group showed the lowest value of 3.1 μm. The NA group had the greatest precision, and the medium occlusal tooth attrition (MA) group and CA group showed a low precision value of 3.2 μm; the difference between the groups was statistically significant (α=0.05). In the color difference map, the CA group showed a lower error than the NA group.
Conclusion: The occlusal surface with severe attrition had excellent accuracy, but the accuracy of the group without attrition was low. There were significant differences between groups, but clinically acceptable values were shown.
Keywords: Tooth attrition, Computer-aided design, Precision, Trueness
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Original Article
Journal of Technologic Dentistry 2020; 42(4): 313-320
Published online December 30, 2020 https://doi.org/10.14347/jtd.2020.42.4.313
Copyright © Korean Academy of Dental Technology.
교합면의 교모형태에 따른 치과용 모형 스캐너의 정확도 평가
김동연1, 김지환2, 이범일2, 이주희3, 김원수3, 박진영4
1폴드 치과기공소, 2고려대학교 일반대학원 보건과학과 치의기공전공, 3대전보건대학교 치기공과, 4스마일치과기공소
Accuracy evaluation of dental model scanner according to occlusal attrition type
Dong-Yeon Kim1 , Ji-Hwan Kim2 , Beom-Il Lee2 , Ju-Hee Lee3 , Won-Soo Kim3 , Jin-Young Park4
14RD Dental Laboratory, Seoul, Korea
2Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Korea
3Department of Dental Lab Technology, Daejeon Health Institute of Technology, Daejeon, Korea
4Smile Dental Laboratory, Boeun, Korea
Correspondence to:Dong-Yeon Kim
4RD Dental Laboratory, 9 Sejong-daero 1-gil, Jung-gu, Seoul 04512, Korea
E-mail: kdy1713@korea.ac.kr
https://orcid.org/0000-0002-3670-8591
Abstract
Purpose: The purpose of this study is to compare and analyze the accuracy of single crowns based on the type of occlusal surface.
Methods: A single crown wax pattern was fabricated in three types of occlusal surface. The prepared wax pattern was replicated with silicone, and stone was injected to create a stone model. The prepared specimens were scanned using a model scanner. Scans were classified into three groups, and each scan was performed six times to analyze the trueness and precision of a single crown. In addition, only the occlusal surface area was analyzed for trueness and precision. Data were analyzed using the Kruskal–Wallis H test, a nonparametric test (α=0.05).
Results: With regard to the trueness value of the occlusal scan area, the no occlusal tooth attrition (NA) group showed the largest error of 3.5 μm, and the complete occlusal tooth attrition (CA) group showed the lowest value of 3.1 μm. The NA group had the greatest precision, and the medium occlusal tooth attrition (MA) group and CA group showed a low precision value of 3.2 μm; the difference between the groups was statistically significant (α=0.05). In the color difference map, the CA group showed a lower error than the NA group.
Conclusion: The occlusal surface with severe attrition had excellent accuracy, but the accuracy of the group without attrition was low. There were significant differences between groups, but clinically acceptable values were shown.
Keywords: Tooth attrition, Computer-aided design, Precision, Trueness
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Table 1 . Trueness of single crown scan data (n=5) (unit: μm).
Group Mean SD Median 95% CI p-value Min Max NA 3.5 0.4 3.4 3.0 4.0 0.070 MA 3.1 0.3 2.9 2.7 3.4 CA 3.1 0.3 3.1 2.8 3.4 SD: standard deviation, CI: confidence interval, NA: no occlusal tooth attrition, MA: medium occlusal tooth attrition, CA: complete occlusal tooth attrition..
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Table 2 . Precision of single crown scan data (n=5) (unit: μm).
Group Mean SD Median 95% CI p-value Min Max NA 3.2 0.3 3.2 3.0 3.4 0.147 MA 3.1 0.2 3.0 2.9 3.2 CA 3.3 0.3 3.3 3.1 3.5 SD: standard deviation, CI: confidence interval, NA: no occlusal tooth attrition, MA: medium occlusal tooth attrition, CA: complete occlusal tooth attrition..
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Table 3 . Trueness of occlusal surface scan data (n=5) (unit: μm).
Group Mean SD Median 95% CI p-value Min Max NA 3.5 0.2 3.5 3.3 3.7 0.046 MA 3.2 0.2 3.2 3.0 3.5 CA 3.1 0.2 3.1 3.0 3.3 SD: standard deviation, CI: confidence interval, NA: no occlusal tooth attrition, MA: medium occlusal tooth attrition, CA: complete occlusal tooth attrition..
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Table 4 . Precision of occlusal surface scan data (n=5) (unit: μm).
Group Mean SD Median 95% CI p-value Min Max NA 3.5 0.2 3.5 3.3 3.6 0.038 MA 3.2 0.3 3.2 3.0 3.4 CA 3.2 0.1 3.2 3.1 3.3 SD: standard deviation, CI: confidence interval, NA: no occlusal tooth attrition, MA: medium occlusal tooth attrition, CA: complete occlusal tooth attrition..
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