Lithium Disilicate Properties — NDEB AFK MCQ

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ModerateDental MaterialsLithium Disilicate PropertiesNDEB AFK

In the classification of dental ceramics, which material is considered a glass-ceramic with a flexural strength of approximately 360-400 MPa?

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Correct answer: D — Lithium disilicate glass ceramic (e.g., IPS e.max Press/CAD)

Lithium disilicate glass ceramic (e.g., IPS e.max Press/CAD) has a flexural strength of approximately 360-400 MPa, making it the strongest glass-ceramic material. It provides excellent translucency and aesthetics (superior to zirconia) while maintaining adequate strength for single-unit crowns and three-unit anterior FPDs. It can be bonded using traditional silane coupling and hydrofluoric acid etching (unlike zirconia). Feldspathic porcelain has only 60-70 MPa; leucite-reinforced has ~160 MPa.

Reference: Anusavice – Phillips' Science of Dental Materials, 13th ed., 2022