The effect of environment on the physical properties of core materials

Yoo-Sook Hwang; Kyoung-Kyu Choi; Sang-Jin Park

doi:10.5395/JKACD.2005.30.2.086

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Original Article The effect of environment on the physical properties of core materials: Yoo-Sook Hwang¹, Kyoung-Kyu Choi^1,2, Sang-Jin Park^1,2; 2005;30(2):-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

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Abstract
REFERENCES

Abstract

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

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

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

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