Abstract
Purpose: To evaluate the marginal and internal gaps of cobalt-chromium (Co-Cr) alloy copings fabricated using subtractive and additive manufacturing. Methods: A study model of an abutment tooth 46 was prepared by a 2-step silicone impression with dental stone. Fifteen stereolithography files for Co-Cr alloy copings were compiled using a model scanner and dental CAD software. Using the lost wax (LW), wax block (WB), soft metal block (SMB), microstereolithography (μ-SLA), and selected laser melting (SLM) techniques, 15 Co-Cr alloy copings were fabricated per group. The marginal and internal gaps of these Co-Cr alloy copings were measured using a digital microscope (160×), and the data obtained were analyzed using the non-parametric Kruskal-Wallis H-test and post-hoc Mann-Whitney U-test with Bonferroni correction. Results: The mean values of the marginal, axial wall, and occlusal gaps were 91.8, 83.4, and 163. μm in the LW group; 94.2, 77.5, and 122. μm in the WB group; 60.0, 79.4, and 90.8. μm in the SMB group; 154, 72.4, and 258. μm in the μ-SLA group; and 239, 73.6, and 384. μm in the SLM group, respectively. The differences in the marginal and occlusal gaps between the 5 groups were statistically significant (P. <. .05). Conclusions: The marginal gaps of the LW, WB, and SMB groups were within the clinically acceptable limit, but further improvements in the μ-SLA and SLM approaches may be required prior to clinical implementation.
| Original language | English |
|---|---|
| Journal | Journal of Prosthodontic Research |
| DOIs | |
| Publication status | Accepted/In press - 2017 |
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Keywords
- Additive manufacturing
- CAD/CAM
- Cobalt-chromium
- Internal gap
- Marginal gap
ASJC Scopus subject areas
- Oral Surgery
- Dentistry (miscellaneous)
Cite this
Comparison and evaluation of marginal and internal gaps in cobalt-chromium alloy copings fabricated using subtractive and additive manufacturing. / Kim, Dong Yeon; Kim, Ji Hwan; Kim, Hae-Young; Kim, Woong Chul.
In: Journal of Prosthodontic Research, 2017.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Comparison and evaluation of marginal and internal gaps in cobalt-chromium alloy copings fabricated using subtractive and additive manufacturing
AU - Kim, Dong Yeon
AU - Kim, Ji Hwan
AU - Kim, Hae-Young
AU - Kim, Woong Chul
PY - 2017
Y1 - 2017
N2 - Purpose: To evaluate the marginal and internal gaps of cobalt-chromium (Co-Cr) alloy copings fabricated using subtractive and additive manufacturing. Methods: A study model of an abutment tooth 46 was prepared by a 2-step silicone impression with dental stone. Fifteen stereolithography files for Co-Cr alloy copings were compiled using a model scanner and dental CAD software. Using the lost wax (LW), wax block (WB), soft metal block (SMB), microstereolithography (μ-SLA), and selected laser melting (SLM) techniques, 15 Co-Cr alloy copings were fabricated per group. The marginal and internal gaps of these Co-Cr alloy copings were measured using a digital microscope (160×), and the data obtained were analyzed using the non-parametric Kruskal-Wallis H-test and post-hoc Mann-Whitney U-test with Bonferroni correction. Results: The mean values of the marginal, axial wall, and occlusal gaps were 91.8, 83.4, and 163. μm in the LW group; 94.2, 77.5, and 122. μm in the WB group; 60.0, 79.4, and 90.8. μm in the SMB group; 154, 72.4, and 258. μm in the μ-SLA group; and 239, 73.6, and 384. μm in the SLM group, respectively. The differences in the marginal and occlusal gaps between the 5 groups were statistically significant (P. <. .05). Conclusions: The marginal gaps of the LW, WB, and SMB groups were within the clinically acceptable limit, but further improvements in the μ-SLA and SLM approaches may be required prior to clinical implementation.
AB - Purpose: To evaluate the marginal and internal gaps of cobalt-chromium (Co-Cr) alloy copings fabricated using subtractive and additive manufacturing. Methods: A study model of an abutment tooth 46 was prepared by a 2-step silicone impression with dental stone. Fifteen stereolithography files for Co-Cr alloy copings were compiled using a model scanner and dental CAD software. Using the lost wax (LW), wax block (WB), soft metal block (SMB), microstereolithography (μ-SLA), and selected laser melting (SLM) techniques, 15 Co-Cr alloy copings were fabricated per group. The marginal and internal gaps of these Co-Cr alloy copings were measured using a digital microscope (160×), and the data obtained were analyzed using the non-parametric Kruskal-Wallis H-test and post-hoc Mann-Whitney U-test with Bonferroni correction. Results: The mean values of the marginal, axial wall, and occlusal gaps were 91.8, 83.4, and 163. μm in the LW group; 94.2, 77.5, and 122. μm in the WB group; 60.0, 79.4, and 90.8. μm in the SMB group; 154, 72.4, and 258. μm in the μ-SLA group; and 239, 73.6, and 384. μm in the SLM group, respectively. The differences in the marginal and occlusal gaps between the 5 groups were statistically significant (P. <. .05). Conclusions: The marginal gaps of the LW, WB, and SMB groups were within the clinically acceptable limit, but further improvements in the μ-SLA and SLM approaches may be required prior to clinical implementation.
KW - Additive manufacturing
KW - CAD/CAM
KW - Cobalt-chromium
KW - Internal gap
KW - Marginal gap
UR - http://www.scopus.com/inward/record.url?scp=85021753461&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85021753461&partnerID=8YFLogxK
U2 - 10.1016/j.jpor.2017.05.008
DO - 10.1016/j.jpor.2017.05.008
M3 - Article
C2 - 28663024
AN - SCOPUS:85021753461
JO - Journal of Prosthodontic Research
JF - Journal of Prosthodontic Research
SN - 1883-1958
ER -