the apical margin of a dental restoration extends into the area of the tooth that is normally occupied by the junctional epithelium and connective tissue attachment fibers. is this restoration good for the health of the periodontium? group of answer choices a) yes, removal of decay will permit better self-care in this area b) yes, the design of this restoration presents no problems for the periodontium c) no, this restoration violates the biologic width d) no, because to extend subgingivally in this manner, the margin of the restoration must not be well adapted to the tooth surface