Glass transition temperatures of dental porcelains determined by DSC measurement.
The differential scanning calorimetry (DSC) curves for three commercial dentin and incisal porcelains fused-to metal were measured using high-temperature DSC. The glass transition temperatures (Tg) were determined from the DSC curves at heating rates of 7-20 degrees C/min, and the activation energy was derived from an Arrhenius plot of negative reciprocal Tg vs. logarithm of heating rate. The Tg of the dental porcelains depended on the content of aluminum oxide, whereas the activation energy depended on the content of sodium oxide. The ultra-low fusing type porcelains had a low activation energy due to the higher content of sodium oxide than the other porcelains.
Ban
S
S
Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
Hattori
M
M
Narita
K
K
Takada
A
A
Iwase
H
H
Tanigawa
H
H
Hasegawa
J
J
D000537:Aluminum Oxide / Q000032:analysis / Q000737:chemistry; D002152:Calorimetry, Differential Scanning / Q000379:methods / Q000706:statistics & numerical data; D003776:Dental Porcelain / Q000032:analysis* / Q000737:chemistry; D004577:Electron Probe Microanalysis; D005898:Glass / Q000737:chemistry*; D016014:Linear Models; D010087:Oxides / Q000032:analysis / Q000737:chemistry; D017670:Sodium Compounds / Q000032:analysis / Q000737:chemistry; D013696:Temperature; D014961:X-Ray Diffraction
D010087:Oxides; D017670:Sodium Compounds; D003776:Dental Porcelain; C096707:sodium oxide; D000537:Aluminum Oxide