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KMID : 0362120120340030227
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Journal of Technologic Dentistry
2012 Volume.34 No. 3 p.227 ~ p.235
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A comparison of surface hardness and microstructural characteristics between a type IV stone with and without die hardening treatment, and a polyurethane resin die material
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Lee Wan-Sun
Kim Ji-Hwan
Kim Tae-Suk
Kim Nam-Sic
Yu Chin-Ho
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Abstract
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Purpose: This study compared the surface hardness (Vickers) and microstructural characteristics between a type IV stone with and without die hardening treatment, a polyurethane die material.
Methods: Materials used were a type IV stone(MG Crystal Rock), two die hardeners (Hardening bath, Epox-it), and a polyurethane resin material(Polyluck). Six specimens per group were prepared according to manufacturer’s directions. The prepared specimens were tested by means of hardness test, one-way ANOVA analysis, scanning electron microscopic(SEM) observations and energy dispersive spectroscopic(EDS) analysis.
Results: In the hardness test and its statistical analysis, there was no significant difference in the surface hardness between a type IV stone and type IV stone with die hardener coating, type IV stone mixed with an epoxy like material instead of water. In contrast, polyurethane resin material exhibited significantly greater surface hardness than other specimen groups (p<0.05).
Conclusion: By considering the results of the hardness test, SEM observations and EDS analysis, although the die hardeners on type IV stone did not show remarkable improvement in surface hardness, the die hardener coating on the surface of type IV stone material did show decrease of microporous and improvement of surface defects.
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KEYWORD
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Gypsum products, Die stone, Surface hardness, EDS Analysis, Polyurethane resin material
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