Comparison and evaluation of marginal and internal gaps in cobalt-chromium alloy copings fabricated using subtractive and additive manufacturing

Dong Yeon Kim, Ji Hwan Kim, Hae-Young Kim, Woong Chul Kim

Research output: Contribution to journalArticle

13 Citations (Scopus)

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 languageEnglish
JournalJournal of Prosthodontic Research
DOIs
Publication statusAccepted/In press - 2017

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Chromium Alloys
Waxes
Freezing
Lasers
Metals
Tooth
Dental Models
Silicones
Nonparametric Statistics
Software

Keywords

  • Additive manufacturing
  • CAD/CAM
  • Cobalt-chromium
  • Internal gap
  • Marginal gap

ASJC Scopus subject areas

  • Oral Surgery
  • Dentistry (miscellaneous)

Cite this

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title = "Comparison and evaluation of marginal and internal gaps in cobalt-chromium alloy copings fabricated using subtractive and additive manufacturing",
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.",
keywords = "Additive manufacturing, CAD/CAM, Cobalt-chromium, Internal gap, Marginal gap",
author = "Kim, {Dong Yeon} and Kim, {Ji Hwan} and Hae-Young Kim and Kim, {Woong Chul}",
year = "2017",
doi = "10.1016/j.jpor.2017.05.008",
language = "English",
journal = "Journal of Prosthodontic Research",
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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

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