Query Processing and Optimization in Object Relational Databases

PCT No. PCT/DE93/00596 Sec. 371 Date Jun. 10, 1996 Sec. 102(e) Date Jun. 10, 1996 PCT Filed Jul. 3, 1993 PCT Pub. No. WO94/04093 PCT Pub. Date Mar. 3, 1994The invention is directed to an electrically powered dental cleansing device (1) to which a cleansing implement (32) is fitted. In this manner, the cleansing implement (32) can be rotated about its longitudinal axis. The cleansing implement (32) is configured as an integrally formed part comprising a thin and elongate cleansing shaft (125). The cleansing shaft has at least one longitudinal edge and is provided with a plurality of serrations.