Prosthodontics & Occlusion · single question
How do you check for interferences on the inner (intaglio) surface of a crown during try-in?
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Correct answer: A. Vinyl polyether silicone (Fit Checker®)
FIT CHECKER (polyvinyl siloxane fit indicator material / die spacer analog) is placed inside the crown (intaglio surface) before seating. When the crown is seated, areas of premature contact prevent the material from thinning — these thickened areas mark where the crown is being obstructed. This identifies internal interferences that prevent complete seating. Articulating paper marks OCCLUSAL contacts, not internal fit issues.
- A. CORRECT. Fit Checker (vinyl polysiloxane fit indicator) is applied to the intaglio surface of the crown. When seated, areas of pressure squeeze the material thin. Remaining thick areas identify contact points/interferences inside the crown that prevent complete seating.
- B. INCORRECT. Articulating paper (such as Accufilm) marks OCCLUSAL and INTERPROXIMAL contact points when the patient bites down — it does not check the INTERNAL (intaglio) surface of the crown for seating interferences.
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