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
김동연, 황성식
경동대학교 치기공학과
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
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.
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
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.
김동연, 황성식
경동대학교 치기공학과
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
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.
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
Table 1 . Comparison of trueness results between three groups: 0B, 2B, and 4B (unit: µm).
Group | Mean | Median | SD | Min | Max | 95% CI | p-value | |
---|---|---|---|---|---|---|---|---|
Min | Max | |||||||
0B | 22.27a,b,* | 18.15 | 11.27 | 12.70 | 45.20 | 14.21 | 30.33 | 0.013 |
2B | 14.86b | 14.90 | 2.32 | 12.50 | 20.30 | 13.20 | 16.52 | |
4B | 20.54a | 19.10 | 3.15 | 17.30 | 26.10 | 18.28 | 22.80 |
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).
Group | Mean | Median | SD | Min | Max | 95% CI | p-value | |
---|---|---|---|---|---|---|---|---|
Min | Max | |||||||
0B | 19.34 | 18.00 | 5.87 | 13.00 | 31.00 | 15.14 | 23.54 | 0.075 |
2B | 14.18 | 13.20 | 2.01 | 12.50 | 18.40 | 12.75 | 15.62 | |
4B | 16.85 | 15.00 | 4.88 | 11.30 | 26.30 | 13.36 | 20.34 |
CI: confidence interval, SD: standard deviation, Min: minimum, Max: maximum..
Wol Kang, Hyuk-Joon Lee
Journal of Technologic Dentistry 2024; 46(3): 61-66 https://doi.org/10.14347/jtd.2024.46.3.61Dong-Yeon Kim, Ji-Hwan Kim, Beom-Il Lee, Ju-Hee Lee, Won-Soo Kim, Jin-Young Park
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