title: High temperature characteristics and solidification microstructures of dental metallic materials. Part III alloys for metal-bond porcelain.
abstract: 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.
authors.affiliation: Department of Dental Materials, Matsumoto Dental University, Nagano, Japan. snagasawa@po.mdu.ac.jp
authors.forename: Sakae
authors.initials: S
authors.lastname: Nagasawa
authors.forename: Takamitsu
authors.initials: T
authors.lastname: Yoshida
authors.forename: Nobuyoshi
authors.initials: N
authors.lastname: Terashima
authors.forename: Toshihide
authors.initials: T
authors.lastname: Mizoguchi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yagasaki
authors.forename: Koichiro
authors.initials: K
authors.lastname: Kamijo
authors.forename: Michio
authors.initials: M
authors.lastname: Ito
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Platt
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Oshida
mesh_terms: 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
chemical_list: D003722:Dental Alloys; D006047:Gold Alloys; D016876:Metal Ceramic Alloys; D010165:Palladium