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Table 1 Mechanical properties of IPS e.max press and GC Initial™ LiSi press materials.

From: A pilot trial on lithium disilicate partial crowns using a novel prosthodontic functional index for teeth (FIT)

Properties (as provided by manufacturers)UnitsIPS e.max PressInitial LiSi Press
ManufacturerIvoclar VivadentGC
Componentslithium disilicate crystals (approx. 70%),
Li2Si2O5, embedded in a glassy matrix
lithium disilicate micro-crystals equally dispersed in a glass matrix
Crystal systemlithium disilicate - crystals measure 3 to 6 μm in length.lithium disilicate - crystals measure 1.5 μm × 0.5 μm
Flexural StrengthMPa433*454*
Biaxial Flexural StrengthMPa> 500> 500
Vickers hardness (HV10) 5900 ± 100 Mpa600 HV
Chemical solubilitymg/cm240 ± 105.4 μg/cm2
Liner thermal expansion CTE× 10–6/KCoefficient of thermal expansion (100–400 °C) 10.15 ± 0.4 10− 6 K− 1
Coefficient of thermal expansion (100–500 °C) 10.55 ± 0.35 10− 6 K− 1
Liner thermal expansion CTE (25–500 °C) 9,8 × 10− 6 K− 1
Glass transition temperature°C560520
Densityg/cm32.5 ± 0.12,4
  1. *Internal data, University of Siena.