Which of the following is correct concerning tooth preparation for diastema closure with bonded porcelain restorations?

Which of the following is correct concerning tooth preparation for diastema closure with bonded porcelain restorations?
A . Keep all margins supragingival or equigingival
B . Full crown preparations are best used to close spaces
C . Subgingival interdental margins will allow for improved emergence profiles
D . Mini-wings must always be used to close a black triangle interdentally

Answer: C

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