Violation

Planing the enamel at the gingival cavosurface of a Class II amalgam preparation on a permanent tooth

should remove unsupported enamel which may fracture

should result in a sharp gingivoproximal line angle

is unnecessary since the tooth structure in this area is strong.

is contraindicated because of the low edge strength of amalgam.

should result in a long bevel.

Please describe the matter of abuse