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KMID : 1035320140410010001
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Korean Society for Dental Materials
2014 Volume.41 No. 1 p.1 ~ p.8
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Effect of repeat processing on mechanical properties of two pressable glass-ceramic dental materials
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Lim Chung-Ha
Shin Jae-Woo
Seok Jung-Jin
Ji Jeong-Hui
Lee Min-Ho
Bae Tae-Sung
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Abstract
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The purpose of this study was to evaluate the effect of repeat processing on the mechanical properties of two pressable glass-ceramic dental materials. IPS e.max ZirPress of apatite-reinforced glass-ceramic material and IPS e.max Press of lithium disilicate-reinforced glass-ceramic material were used in this study. Twenty disc specimens (13.0 mm × 1.5 mm) for each material were prepared by 4 times repeated heat-pressing. Sprue and button parts were reused to make specimens for every repeated heat-pressing. This study compared the biaxial flexural strength, Vickers hardness, fracture toughness, and the X-ray diffraction response. Microstructures were examined using a scanning electron microscope (SEM). IPS e.max Press showed the decrease of the biaxial flexural strength and fracture toughness values and the increase in sizes of the lithium disilicate crystals after repeat processing for 3 times. IPS e.max ZirPress showed the decrease in Vickers hardness value after repeat processing for 2 times. Based on these results of this study, clinically acceptable limits of the repeat number of heat-pressing were twice in the case of the IPS e.max Press and to be once in the case of the IPS e.max ZirPress.
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KEYWORD
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mechanical property, pressing, glass-ceramic
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