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• Vitrification: the fusion of porcelainparticles into a translucent amorphous mass• Devitrification: prolonged heating of theporcelain, to temperatures below glasstransition, results in a more opaquecrystalline mass• Sintered: fusion of porcelain particles byheating above the glass transitiontemperature• Glass transition: the range of temperatureabove which the porcelain will change itsphysical stage