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Fig.5: When a zoom lens is used, the shade guide should be placed at the same plane as the tooth. Otherwise, they are not focused at the same time (Fig.4).
The patient prefers that the shades of 8,9 crowns are matching those of the tooth #7.
Xin Wei, DDS, PhD, MS 1st edition 01/10/2015, last revision 01/10/2015