High temperature characteristics and solidification microstructures of dental metallic materials. Part III alloys for metal-bond porcelain.
The thermal expansion rate, coefficient of thermal expansion, and high temperature strength of two types of commercially available alloy for metal-bond porcelain, KIK-HII (KIK) and Degubond-J2 (J2), were evaluated up to the liquidus point temperature using a thermo-mechanical analyzer. Furthermore, microstructure in the solid-liquid coexisting region was observed for evaluation. Our results revealed the following findings: 1. For KIK, solidus point was 1,209.3 +/- 3.2 degrees C, liquidus point was 1,308.3 +/- 7.10 degrees C, and melting expansion rate was 0.41+/- 0.16%. 2. For J2, solidus point was 1,198.3 +/- 0.6 degrees C, liquidus point was 1,253.0 +/- 4.4 degrees C, and melting expansion rate was 4.50 +/- 0.80%. 3. At high temperature, the mechanical characteristics of KIK greatly differed from those of J2. The risk of causing deformation during porcelain baking was suggested for KIK. Removal of segregation during casting was considered difficult in J2.
Nagasawa
Sakae
S
Department of Dental Materials, Matsumoto Dental University, Nagano, Japan. snagasawa@po.mdu.ac.jp
Yoshida
Takamitsu
T
Terashima
Nobuyoshi
N
Mizoguchi
Toshihide
T
Yagasaki
Hiroshi
H
Kamijo
Koichiro
K
Ito
Michio
M
Platt
Jeffrey A
JA
Oshida
Yoshiki
Y
D003460:Crystallization; D003722:Dental Alloys / Q000737:chemistry; D003799:Dental Stress Analysis; D004548:Elasticity; D006047:Gold Alloys; D008422:Materials Testing; D016876:Metal Ceramic Alloys; D010165:Palladium; D044367:Phase Transition; D018583:Pliability; D044366:Transition Temperature
D003722:Dental Alloys; D006047:Gold Alloys; D016876:Metal Ceramic Alloys; D010165:Palladium