ADC Written Exam Practice Questions - ADC Written Examination (Dentists) Exam

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A 55-year-old needs a full-coverage crown on a heavily restored, root-filled premolar 14 with limited remaining coronal tooth structure. To improve retention and protect the remaining structure, which feature is most important to incorporate into the restorative plan?

Maximum taper of the preparation walls to ease seating A wide, flat shoulder margin extending well subgingivally on all surfaces A 1.5-2 mm ferrule of sound tooth structure encircled by the crown margin Removal of all remaining dentine to seat a post as deeply as possible

Correct Answer:

A 1.5-2 mm ferrule of sound tooth structure encircled by the crown margin

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