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The dissolution of leucite (KAISi208) and the precipitation of sanidine (NaxK1 _xAISi308; 0.1 < x< 0.3), occurring during isothermal heat treatments of a dental porcelain for porcelainfused-to-metal restorations, was studied. The identification of phases was performed by X-ray diffraction, optical and scanning electron microscopy. An isothermal time-temperaturetransformation (TTT) diagram, from 800 to 1000°C, and for periods up to 1440 min, is proposed. No metastable cubic leucite was retained by air-quenching in any sample. No increase of leucite volume fraction was observed.

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