#MCQ 20 - Gingival Extension for a restoration should be:

#20 - Gingival Extension for a restoration should be:
A. At the gingival crest
B. At least 1 mm above the alveolar crest
C. At least 3 mm above the alveolar crest
D. Doesn't have any relation with the alveolar crest height

Answer: C. At least 3 mm above the alveolar crest
In a proper restoration, gingival margin of restoration should be at least 1 mm occlusal to the free marginal gingiva. Also, the free gingiva is approximately 2 mm coronal to the alveolar crest. So, margin of restoration should be 2mm (biological width) + 1 mm (distance away from free gingival margin) = 3 mm away from the alveolar crest.

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