When utilizing an acellular dermal matrix as a graft material in covering exposed root surfaces, which of the following is BEST to completely cover the area?

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When utilizing an acellular dermal matrix as a graft material in covering exposed root surfaces, which of the following is BEST to completely cover the area?
A . An envelope flap
B . A double papillae graft
C . A free gingival graft
D . A coronally positioned flap

Answer: D