The Correct Answer is b,d
A beveled margin would allow for a thin layer of restorative material, more prone to fracture than a 90 cavosurface margin. GI restorative material should not be used in occlusal load areas due to poor wear resistance. Sharp line angles will allow voids under the restorative material since the material lacks adequate flow characteristics. Polyacrylic acid is the agent of choice to remove the smear layer.
Fundamentals of Operative Dentistry 2ND Edition Summit, Robbins, Schwartz 2001 PG 396-7
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