1. Jiang Zemin carried on and developed Deng Xiaoping s thought on public control penetratingly, explicating the target and means of public control in period of transformation.

2. The present invention provides a healing abutment comprising: a coupling portion provided with a polygonal fitting protrusion corresponding to the shape of a polygonal groove on a fixture implanted in an alveolar bone; a lower body integrally formed with and above the coupling portion and shaped so that the diameter widens toward the top; an upper body integrally formed with and above the lower body and shaped in a tapered manner so that the diameter narrows toward the top; cut-open surfaces formed on two sides of the upper body so as to be symmetrical in shape; depressed grooves formed on the outer circumferential surface of the upper body excluding the cut-open surfaces; and a coupling aperture formed penetratingly from the upper body through the coupling portion.