[Texture formation of the dental ceramic core material In-Ceram and thermal expansion of its individual components].
Electron microscopic investigations of the core material In-Ceram show how its texture is formed. While these are processed the Al2O3 crystallites turn idiomorphic. Etching the material with sulphuric acid selectively dissolves the glassy phase and reveals the crystallites. The chemical composition of the two components of the core material is determined by microprobe analysis. While the crystallites are pure Al2O3, the glass consists of La2O3, SiO2, Al2O3 and CaO. Measurements of the thermal expansions of the glass and the Al2O3 frame show the value for the glass to be 5.1% lower than that of the Al2O3 frame. This results in internal pressure and contributes to the high strength of the material.
Fischer
J
J
Kristallographisches Institut der Universität Freiburg.
Schmid
M
M
Kappert
H F
HF
Strub
J R
JR
D000537:Aluminum Oxide / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D004577:Electron Probe Microanalysis; D008422:Materials Testing; D008854:Microscopy, Electron; D013499:Surface Properties; D013718:Tensile Strength
D003776:Dental Porcelain; C070870:In-Ceram; D000537:Aluminum Oxide
Gefügeausbildung der dentalkeramischen Kernmasse In-Ceram und thermische Dehnung ihrer Einzelkomponenten.