Effects of repeated baking on the mechanical and physical properties of metal-ceramic systems.
This study evaluates effects of repeated baking processes on the mechanical and physical properties of single and triple applications of opaque, body and enamel porcelains fused to three different metal substrates (precious metal, semi-precious metal and non-precious metal). The vintage halo porcelain system was employed and fused to metals. Fused samples were subjected to three-point bend tests to evaluate bend strength and modulus of elasticity. It was found that, by increasing repeated baking cycles, (1) body and enamel porcelains increased bend strengths but opaque porcelain did not show any changes, (2) all triple-layered porcelains fired to metals increased bend strengths, and (3) all three porcelains and metal substrates did not exhibit changes in thermal expansion percentage. It was concluded that repeating baking procedures up to 10 cycles did not exhibit any adverse effects on the final properties of porcelain-fired to metals, rather it was noticed that mechanical strengths increased by increasing cycles.
Nagasawa
Sakae
S
Department of Dental Materials, Divison of Biomaterials, Institute of Oral Science, Matsumoto Dental University, Gobara, Hirooka Shiojiri, Nagano, Japan. snagasawa@po.mdu.ac.jp
Yoshida
Takamitsu
T
Mizoguchi
Toshihide
T
Terashima
Nobuyoshi
N
Kamijyo
Kuni
K
Ito
Michio
M
Oshida
Yoshiki
Y
D003776:Dental Porcelain; D003799:Dental Stress Analysis; D004548:Elasticity; D020342:Finite Element Analysis; D006358:Hot Temperature; D008422:Materials Testing; D016876:Metal Ceramic Alloys; D018583:Pliability
D016876:Metal Ceramic Alloys; C096474:Vintage Porcelain; D003776:Dental Porcelain