Abstract: A bristle shaft device for use in disinfecting subgingival parodontal pockets, parodontal pocket edges and tooth surfaces, the device having a rotationally symmetrical gingival edge cup having an axis and an external periphery and a plurality of coaxial bristle shafts arranged coaxially in a ring and held in position by the cup. The shafts project from the external periphery and are formed as individual radially adjacent layers. One of the layers extend beyond the other layers so as to have an exposed end and can penetrate into a subgingival parodontal pocket up to a ligamentum circulare. Another layer adjacent to the one layer resists a bending of the exposed layer. The remaining layers are formed as multiple stepped layers that drop off in steps from each other in a radially outward direction providing further reinforcement. The one layer is radially innermost of the rest of the layers. Both the one layer and the adjacent another layer project beyond the remaining layers.

Abstract: A bristle ring for use in dental care comprises a rotating cup, at least two rows of bristles arranged in ring shape, the bristles being mounted in said cup and forming a configuration of outwardly diminishing cross-section of frusto-conical shape, the foremost portions of the bristles having a frusto-conical shape of outwardly diminishing cross-section and the inner row of bristles extending beyond the adjoining outer row so as to protrude beyond said frusto-conical configuration and form an outer circular sharp edge.