Abstract: The dental device comprises an abrasive disk having a hub made of synthetic material and a spindle with a collet, the opening of the hub having an inner bead and the collet a rotation lock and an axial lock for receiving said bead in the hub opening, the greatest diameter of the spindle with its rotation lock being greater than the diameter of the hub opening with its bead. This construction allows, on one hand, an easier mounting of the abrasive disk on the spindle, and, on the other hand, a high torque transmission.

Abstract: A dental matrix tensioner has a casing containing a pin rotatable relative to the casing, the pin having a slot therein for releasably receiving a dental matrix and for tightening the matrix about a tooth upon rotation of the pin relative to the casing. A device to rotate the pin relative to the casing comprises an elongated assembly, and a member slidable lengthwise of the assembly in one direction to grip external portions of the casing and in an opposite direction to release those external portions of casing thereby selectively releasably to retain the rotating device in assembled relation with the casing. The lengthwise slidable member is also rotatable and is selectively engageable with the pin to rotate the pin upon rotation of the slidable member. The slidable and rotatable member has a noncircular end which fits removably in a noncircular recess in the pin whereupon when that end is inserted in the noncircular recess and sliding member is rotated, the pin is turned relative to the casing.

Abstract: The matrix consisting of a thin flexible strip of plastic comprises a loop 1 to be placed around the tooth to give the desired shape to the filling material. It is permanently connected to an annular tightener (2) made of material permanently deformable by pressure with the fingers and dentist's forceps, for example, of annealed aluminum sheet. It exhibits, in the front, a slit (3) through which pass the two terminal extensions (1',1") of flexible strip (1) and, in the back, tabs (2',2") between which are permanently fastened the ends of said terminal extensions (1, 1") of said strip, so that by compressing said annular tightener (arrows 4, 5) it determines the slipping of slit (3) like a slider on the extensions (1', 11") of the strip, the narrowing of loop (1) and the perfect adherence of the loop of the strip to the tooth.

Abstract: The sheet-like dental die, with the anatomical characteristics of the profile of a certain type of tooth, made of a material permeable to light and to UV rays and which does not bind to hardenable filling synthetic materials by radiation, is deposited according to the configuration and utilization about the tooth to be filled from the tongue or vestibule side and the two even lobes (1) are pressed against each other on the opposite side by means of a dentist pincer while the filling is irradiated to allow its polymerization or at least its introduction.