Porcelain Veneer Preparation — NDEB AFK MCQ
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Correct answer: A — 0.5 mm
The minimum recommended preparation depth for a porcelain veneer is 0.3-0.5 mm within enamel. Maintaining preparation within enamel is critical because the bond strength of resin cement to etched enamel (30-40 MPa) is significantly greater than to dentin (15-25 MPa). Preparations that extend beyond enamel into dentin have higher failure rates. Depth-cutting burs help ensure controlled, uniform reduction.
Reference: Heymann – Sturdevant's Art and Science of Operative Dentistry, 7th ed., 2019