Minimum Remaining Dentin Thickness — NDEB AFK MCQ
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Correct answer: E — 1.0-2.0 mm
A minimum remaining dentin thickness (RDT) of approximately 1.0-2.0 mm between the deepest point of the cavity preparation and the pulp is generally recommended to protect the pulp from thermal conductivity (through metallic restorations), chemical irritation (from cement components), and bacterial diffusion. When the RDT is less than 0.5 mm (near exposure), a protective liner/base (calcium hydroxide, RMGIC) should be placed. The dentinal tubules per mm² increase dramatically closer to the pulp, increasing permeability and sensitivity.
Reference: Heymann – Sturdevant's Art and Science of Operative Dentistry, 7th ed., 2019