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The effect of environment on the physical properties of core materials
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Original Article The effect of environment on the physical properties of core materials
Yoo-Sook Hwang1, Kyoung-Kyu Choi1,2, Sang-Jin Park1,2
Journal of Korean Academy of Conservative Dentistry 2005;30(2):86-94.
DOI: https://doi.org/10.5395/JKACD.2005.30.2.086
Published online: March 31, 2005

1Department of Conservative Dentistry, Division of Dentistry, Graduate School, Kyunghee University, Korea.

2Oral Biology Research Institute, College of Dentistry, Kyunghee University, Korea.

Corresponding author: Sang-Jin Park. Department of Conservative Dentistry, Division of Dentistry, Graduate school of KyungHee University, 1, Hoegi Dong, Dongdaemoon Gu, Seoul, Korea, 130-702. Tel: 82-2-958-9335, psangjin@khu.ac.kr
• Received: July 1, 2004   • Revised: August 18, 2004   • Accepted: October 9, 2004

Copyright © 2005 Korean Academy of Conservative Dentistry

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  • The purpose of this study was to measure the flexural strength and hardness of four core materials in 4 different medias and to evaluate the relationship between the physical properties.
    For the flexural strength, the specimens were prepared from each of the following materials: Bisfil Core, Core Max, Fuji IX GP, Miracle Mix and randomly divided into four groups and stored at 37 degree C in the following medias: distilled water for 24 hours (DW/1), distilled water for 30 days (DW/30). 2% NaF for 30 days (NF/30), 0.02N lactic acid for 30 days (LA/30). After storage, the specimens were subjected to flexural strength testing and calculated to flexural modulus.
    For hardness testing, specimens were prepared from four materials and storaged in the uniform way. After storage, the specimens were subjected to Vicker's hardness testing.
    1. The flexural strength of Core Max were the highest, and the flexural strength of Miracle Mix were the lowest.
    2. The hardness of Bisfil Core were the highest.
    3. The hardness of Core Max were the highest.
    4. The hardness of Miracle Mix were the lowest.
    5. 2% NaF and 0.02N lactic acid negatively affected the flexural strength and hardness of four core materials.
  • Keywords: Mechanical properties; Core materials; Flexural strength; Hardness
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Figure 1
Flexural strengths (MPa ± SD) of four groups
jkacd-30-86-g001.jpg
Figure 2
Flexural modulus (GPa ± SD) of four groups
jkacd-30-86-g002.jpg
Figure 3
Vicker's Hardness Number (VHN) of four groups
jkacd-30-86-g003.jpg
Table 1
Materials used in this study
jkacd-30-86-i001.jpg
Table 2
Experimental groups and storage conditions
jkacd-30-86-i002.jpg
Table 3
Flexural strengths of four groups at different conditions (MPa ± SD)
jkacd-30-86-i003.jpg
Table 4
Flexural Modulus of four groups at different conditions (GPa ± SD)
jkacd-30-86-i004.jpg
Table 5
Vicker's Hardness number (VHN) of four groups at different conditions
jkacd-30-86-i005.jpg

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        The effect of environment on the physical properties of core materials
        J Korean Acad Conserv Dent. 2005;30(2):86-94.   Published online March 31, 2005
        DOI: https://doi.org/10.5395/JKACD.2005.30.2.086
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      The effect of environment on the physical properties of core materials
      Image Image Image
      Figure 1 Flexural strengths (MPa ± SD) of four groups
      Figure 2 Flexural modulus (GPa ± SD) of four groups
      Figure 3 Vicker's Hardness Number (VHN) of four groups

      Figure 1

      Figure 2

      Figure 3

      The effect of environment on the physical properties of core materials

      Materials used in this study

      Experimental groups and storage conditions

      Flexural strengths of four groups at different conditions (MPa ± SD)

      Flexural Modulus of four groups at different conditions (GPa ± SD)

      Vicker's Hardness number (VHN) of four groups at different conditions
      Table 1 Materials used in this study

      Table 2 Experimental groups and storage conditions

      Table 3 Flexural strengths of four groups at different conditions (MPa ± SD)

      Table 4 Flexural Modulus of four groups at different conditions (GPa ± SD)

      Table 5 Vicker's Hardness number (VHN) of four groups at different conditions

      Table 1

      Table 2

      Table 3

      Table 4

      Table 5

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