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Journal of Technologic Dentistry 2024; 46(4): 141-149

Published online December 30, 2024

https://doi.org/10.14347/jtd.2024.46.4.141

© Korean Academy of Dental Technology

경화 작업 시 가압에 따른 초경석고(type Ⅳ)의 3차원 정확도 분석

김동연, 황성식

경동대학교 치기공학과

Received: November 7, 2024; Revised: December 5, 2024; Accepted: December 22, 2024

Three-dimensional accuracy analysis of type IV dental stone under pressure during setting process

Dong-Yeon Kim , Seong-Sig Hwang

Department of Dental Technology, Kyungdong University, Wonju, Korea

Correspondence to :
Dong-Yeon Kim
Department of Dental Technology, Kyungdong University, 815 Gyeonhwon-ro, Munmak-eup, Wonju 26495, Korea
E-mail: kdy1713@kduniv.ac.kr
https://orcid.org/0000-0002-3670-8591

Received: November 7, 2024; Revised: December 5, 2024; Accepted: December 22, 2024

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose: This study aimed to evaluate the impact of pressurization on the three-dimensional accuracy—trueness and precision—of full-arch type IV dental stone models used in prosthodontics.
Methods: Dental stone models were categorized into three groups based on the applied pressurization levels during the setting process: 0 bars (0B group), 2 bars (2B group), and 4 bars (4B group). A dental pressurization system was employed to maintain pressure levels of 0, 2, and 4 bars, respectively. The models were analyzed using three-dimensional scanning and superimposition techniques, comparing them with a master model. A color-difference analysis was performed, with a 10-μm tolerance for green zones to standardize error evaluation.
Results: The 2B group (2 bars) exhibited the highest accuracy, with minimal mean errors in trueness and precision relative to the 0B and 4B groups. The 0B group demonstrated significant deformation, attributed to microbubble formation and structural instability during the setting process. In contrast, the 4B group experienced increased internal stress and uneven curing, leading to slight distortions.
Conclusion: Moderate pressurization at 2 bars significantly enhances the accuracy of type IV dental stone models by reducing deformations and minimizing trueness and precision errors. These findings suggest that controlled pressurization during the setting process improves the overall quality of dental prostheses.

Keywords: Dental stone, Precision, Pressure device, Three-dimensional, Trueness, Type IV dental stone

Article

Original Article

Journal of Technologic Dentistry 2024; 46(4): 141-149

Published online December 30, 2024 https://doi.org/10.14347/jtd.2024.46.4.141

Copyright © Korean Academy of Dental Technology.

경화 작업 시 가압에 따른 초경석고(type Ⅳ)의 3차원 정확도 분석

김동연, 황성식

경동대학교 치기공학과

Received: November 7, 2024; Revised: December 5, 2024; Accepted: December 22, 2024

Three-dimensional accuracy analysis of type IV dental stone under pressure during setting process

Dong-Yeon Kim , Seong-Sig Hwang

Department of Dental Technology, Kyungdong University, Wonju, Korea

Correspondence to:Dong-Yeon Kim
Department of Dental Technology, Kyungdong University, 815 Gyeonhwon-ro, Munmak-eup, Wonju 26495, Korea
E-mail: kdy1713@kduniv.ac.kr
https://orcid.org/0000-0002-3670-8591

Received: November 7, 2024; Revised: December 5, 2024; Accepted: December 22, 2024

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose: This study aimed to evaluate the impact of pressurization on the three-dimensional accuracy—trueness and precision—of full-arch type IV dental stone models used in prosthodontics.
Methods: Dental stone models were categorized into three groups based on the applied pressurization levels during the setting process: 0 bars (0B group), 2 bars (2B group), and 4 bars (4B group). A dental pressurization system was employed to maintain pressure levels of 0, 2, and 4 bars, respectively. The models were analyzed using three-dimensional scanning and superimposition techniques, comparing them with a master model. A color-difference analysis was performed, with a 10-μm tolerance for green zones to standardize error evaluation.
Results: The 2B group (2 bars) exhibited the highest accuracy, with minimal mean errors in trueness and precision relative to the 0B and 4B groups. The 0B group demonstrated significant deformation, attributed to microbubble formation and structural instability during the setting process. In contrast, the 4B group experienced increased internal stress and uneven curing, leading to slight distortions.
Conclusion: Moderate pressurization at 2 bars significantly enhances the accuracy of type IV dental stone models by reducing deformations and minimizing trueness and precision errors. These findings suggest that controlled pressurization during the setting process improves the overall quality of dental prostheses.

Keywords: Dental stone, Precision, Pressure device, Three-dimensional, Trueness, Type IV dental stone

Fig 1.

Figure 1.Master model (Die stone, Snow Rock).
Journal of Technologic Dentistry 2024; 46: 141-149https://doi.org/10.14347/jtd.2024.46.4.141

Fig 2.

Figure 2.Study model of production design.
Journal of Technologic Dentistry 2024; 46: 141-149https://doi.org/10.14347/jtd.2024.46.4.141

Fig 3.

Figure 3.Study model fabrication. (A) 2 bar (0.2 MPa) pressure setting, (B) 2 bar (0.2 MPa) study model, (C) 4 bar (0.4 MPa) pressure setting, (D) 4 bar (0.4 MPa) study model.
Journal of Technologic Dentistry 2024; 46: 141-149https://doi.org/10.14347/jtd.2024.46.4.141

Fig 4.

Figure 4.Study model. (A) 0 bar study model (no. 1~no. 10), (B) 0 bar representative study model, (C) 0 bar study model (no. 11~no. 20), (D) 2 bar representative study model, (E) 2 bar study model (no. 21~no. 30), (F) 4 bar representative study model.
Journal of Technologic Dentistry 2024; 46: 141-149https://doi.org/10.14347/jtd.2024.46.4.141

Fig 5.

Figure 5.Comparison of trueness color difference map results between three groups. (A) 0B (no. 1~no. 10) group, (B) 2B (no. 11~no. 20) group, and (C) 4B (no. 21~no. 30) group.
Journal of Technologic Dentistry 2024; 46: 141-149https://doi.org/10.14347/jtd.2024.46.4.141

Fig 6.

Figure 6.Comparison of precision color difference map results between three groups. (A) 0B (no. 1~no. 10) group, (B) 2B (no. 11~no. 20) group, and (C) 4B (no. 21~no. 30) group.
Journal of Technologic Dentistry 2024; 46: 141-149https://doi.org/10.14347/jtd.2024.46.4.141

Table 1 . Comparison of trueness results between three groups: 0B, 2B, and 4B (unit: µm).

GroupMeanMedianSDMinMax95% CIp-value

MinMax
0B22.27a,b,*18.1511.2712.7045.2014.2130.330.013
2B14.86b14.902.3212.5020.3013.2016.52
4B20.54a19.103.1517.3026.1018.2822.80

CI: confidence interval, SD: standard deviation, Min: minimum, Max: maximum..

a,b,*Statistically significant differences (p<0.017)..


Table 2 . Comparison of precision results between three groups: 0B, 2B, and 4B (unit: µm).

GroupMeanMedianSDMinMax95% CIp-value

MinMax
0B19.3418.005.8713.0031.0015.1423.540.075
2B14.1813.202.0112.5018.4012.7515.62
4B16.8515.004.8811.3026.3013.3620.34

CI: confidence interval, SD: standard deviation, Min: minimum, Max: maximum..


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