Start practicing

Prosthodontics & Occlusion · single question

A patient returns a week after crown cementation saying the crown is too white. All of the following could explain the shade error EXCEPT:

  1. The shade guide used did not match the ceramic system
  2. The shade was taken after the teeth had dehydrated
  3. The shade was taken under a single light source only
  4. The shade was selected before tooth preparation
Show answer and explanation

Correct answer: D. The shade was selected before tooth preparation

  • A. A real error — shade guides are not interchangeable across ceramic systems.
  • B. A real error — teeth isolated under rubber dam or open for a long period dehydrate and appear lighter, causing selection of too light a shade.
  • C. A real error — single-source lighting causes metamerism; shade should be checked under multiple light conditions.
  • D. Correct. Taking the shade BEFORE preparation is the correct technique — the teeth are hydrated and the reference tooth is intact. This cannot be the source of the error.

Practice Prosthodontics & Occlusion questions Prosthodontics & Occlusion study notes

More Prosthodontics & Occlusion practice questions