What method is typically used to verify marginal fit of a CAD/CAM crown chairside?

• A. Visual inspection alone
• B. Radiographs
• C. Use fit-checker paste or silicone verification to detect marginal gaps and confirm seating
• D. Check occlusal contacts with wax

Answer: (C)

Verifying marginal fit is done by using fit-checker paste or silicone verification to reveal any gaps at the margin when the crown seats. Applying a flowable paste or low-viscosity silicone around the margin (or on the internal edge) and seating the crown shows exactly where the restoration contacts the tooth. The material darkens or leaves a visible line where there’s a gap, so you can see whether the crown seats fully and whether the marginal seal is continuous. This chairside check is direct and practical for adjusting margins before cementation, and it’s more reliable for margins than radiographs (which can’t clearly show microgaps) or visual inspection alone (which can miss small discrepancies). Occlusal wax checks, while useful for bite, don’t assess marginal fit.