1992
DOI: 10.1016/0955-2219(92)90035-c
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Chemical strengthening of leucite-containing dental ceramics

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Cited by 3 publications
(2 citation statements)
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“…In a microstructural modification driven by ion exchange, external surfaces exposed to NaI or NaCl salt baths were enriched in sodium, shifting the chemical composition toward soda feldspar and away from the leucite phase field (120). Such treatment led to a decreased leucite concentration and a stabilization of cubic leucite in the treated layer, both of which reduced the thermal expansion coefficient relative to untreated internal ceramic.…”
Section: Microstructural Modificationsmentioning
confidence: 99%
“…In a microstructural modification driven by ion exchange, external surfaces exposed to NaI or NaCl salt baths were enriched in sodium, shifting the chemical composition toward soda feldspar and away from the leucite phase field (120). Such treatment led to a decreased leucite concentration and a stabilization of cubic leucite in the treated layer, both of which reduced the thermal expansion coefficient relative to untreated internal ceramic.…”
Section: Microstructural Modificationsmentioning
confidence: 99%
“…It is dimorphic: above 600°C leucite has a cubic unit cell with parameter a = 1.343 nm whereas below this temperature it has a tetragonal unit cell with parameters a = 1.306 nm and c = 1.375 nm. This transition involves a volume expansion (of approximately 3.2%) producing the development of thermally induced stresses upon cooling, which is required for thermal compatibility of dental porcelain with the alloys (Mackert et al, 1986;Fischer et al, 1992;Piché et al, 1994). The cubic phase shows the smallest thermal expansion coefficient of both-that is, 12 to 18 × 10 −6 /°C for the cubic phase and from 22 to 25 × 10 −6 /°C for the tetragonal phase.…”
Section: Discussionmentioning
confidence: 99%