Abstract: A dental implant for a prosthetic appliance comprising a region (I) designed for permanent insertion into a jawbone and a connection region (II) adjacent thereto that bears the prosthetic appliance and is characterized in that said connection region (II) is prefabricated and consists of at least one ceramic region (3) having a core region (3a), and at least one external region (4); said core region (3a) is at least partially surrounded by said external region (4); said at least one external region (4) is made of a workable material for the preparation of a prosthetic appliance; the ceramic material of said ceramic core region (3) has a hardness that is greater than that of the external region (4); and the material of the external region (4) has a hardness equal to or less than that of the range of natural enamel.

Abstract: A polishing dental instrument includes a polisher, which is vibrated by a drive shaft connected to a motor-driven drive via an eccentric pin. The eccentric movements are elastically transferred to two arms via two compression springs. The arms are fixed to a displaceably guided bearing sleeve positioned in the casing. The polisher which is guided in the bearing has an end piece whose lateral edges are adapted to smooth or clean the tooth root surface. As a result of the elastically transferred reciprocating movements of the eccentric pin a very fine smoothing of the root surface is obtained.

Abstract: A polishing dental instrument includes a polisher, which is vibrated by a drive shaft connected to a motor-driven drive via an eccentric pin. The eccentric movements are elastically transferred to two arms via two compression springs. The arms are fixed to a displaceably guided bearing sleeve positioned in a casing. The polisher which is guided in the bearing has an end piece whose lateral edges are adapted to smooth or clean the tooth root surface. As a result of the elastically transferred reciprocating movements of the eccentric pin a very fine smoothing of the root surface is obtained.