Prosthodontics & Occlusion · single question

A patient returns one week after crown cementation stating the crown is too light. All of the following could explain the shade-selection error EXCEPT:

1. The laboratory's shade guide did not correspond to the guide used chairside
2. The clinician's eyes were fatigued during shade selection
3. The shade was selected under the artificial light of the operatory light alone
4. The shade was taken at the very beginning of the appointment

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