Abstract: A dental instrument that includes a tool section, and a handle with a grip section, the grip section having a plurality of helical sections, each helical section being spaced from another helical section by an adjacent helical depression. The helical sections may be textured with adjacent ridges, each ridge having a curved ridgeline. The helical depressions may be defined by concave sections.

Abstract: A cassette that includes at least one tray defined by a plurality of walls extending from a panel to receive at least one dental instrument in a reception space defined by the walls, and a locking mechanism, or at least one lockable lock bar, or one part of a coupling mechanism, located in the reception space.

Abstract: A forceps having relative pivoting forceps joined by connectors and jaws retractable by action of a helical spring in a chamber inside the connectors of the two forceps. A passage from the spring chamber outward to the exterior periphery of a first connector and opening in a space between the two jaws of the two forceps when the forceps and their jaws are retracted, permitting entry of cleaning materials into the interior of the forceps. The jaws being shaped and the passage into the interior of the forceps being so located and shaped that the passage into the interior of the forceps is blocked by at least one of the jaws when the forceps are gripped and the jaws are toward each other.

Abstract: A forceps having relative pivoting forceps joined by connectors and jaws retractable by action of a helical spring in a chamber inside the connectors of the two forceps. A passage from the spring chamber outward to the exterior periphery of a first connector and opening in a space between the two jaws of the two forceps when the forceps and their jaws are retracted, permitting entry of cleaning materials into the interior of the forceps. The jaws being shaped and the passage into the interior of the forceps being so located and shaped that the passage into the interior of the forceps is blocked by at least one of the jaws when the forceps are gripped and the jaws are toward each other.