TY - JOUR
T1 - The effect of Li2O and B2O3 on thermal properties and chemical solubility of low-fusing dental porcelain
AU - Ko, D. J.
AU - Kim, K. N.
AU - Lee, Y. K.
AU - Kim, B. H.
AU - Kim, K. M.
PY - 2005
Y1 - 2005
N2 - Alkali oxides were added to glass frit in order to lower the firing temperature of dental porcelain, and the effects of Li2O and B 2O3 on the thermal properties and chemical solubility of low-fusing dental porcelain were investigated. The glass transition temperature(Tg) and softening temperature(Ts) of glass frits were decreased remarkably by adding Li2O, but the coefficient of thermal expansion(CTE) was increased with Li2O. In the case of adding B 2O3, the thermal properties were unchanged. Tg of B0L4, B2L4 and B4L4 specimens were lower than 500°C and Ts were lower than 550°C. The chemical solubility of prepared low-fusing dental porcelain with these glass frits were 37.3, 43.9, and 49.2μg·cm-2 respectively. The chemical solubility was increased by adding Li2O and B2O3, but all the results were below 100μg·cm-2 and satisfactory to ISO Standards. Further, the chemical solubility of the commercial low-fusing dental porcelains were 52.6μg·cm-2 for Ceramco Finesse(Clear), 70.8μg·cm-2 for Duceram-LFC(TC) and that of conventional dental porcelain, CeraMax(T-C), was 34.8μg·cm-2.
AB - Alkali oxides were added to glass frit in order to lower the firing temperature of dental porcelain, and the effects of Li2O and B 2O3 on the thermal properties and chemical solubility of low-fusing dental porcelain were investigated. The glass transition temperature(Tg) and softening temperature(Ts) of glass frits were decreased remarkably by adding Li2O, but the coefficient of thermal expansion(CTE) was increased with Li2O. In the case of adding B 2O3, the thermal properties were unchanged. Tg of B0L4, B2L4 and B4L4 specimens were lower than 500°C and Ts were lower than 550°C. The chemical solubility of prepared low-fusing dental porcelain with these glass frits were 37.3, 43.9, and 49.2μg·cm-2 respectively. The chemical solubility was increased by adding Li2O and B2O3, but all the results were below 100μg·cm-2 and satisfactory to ISO Standards. Further, the chemical solubility of the commercial low-fusing dental porcelains were 52.6μg·cm-2 for Ceramco Finesse(Clear), 70.8μg·cm-2 for Duceram-LFC(TC) and that of conventional dental porcelain, CeraMax(T-C), was 34.8μg·cm-2.
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U2 - 10.4028/0-87849-961-x.917
DO - 10.4028/0-87849-961-x.917
M3 - Article
AN - SCOPUS:34249076026
SN - 1013-9826
VL - 284-286
SP - 917
EP - 920
JO - Key Engineering Materials
JF - Key Engineering Materials
ER -