Dental hand piece, comprising a housing and a drive train with a coupling element for a drive, wherein the housing radially surrounds the drive train and wherein the housing has a first and a second housing end, and wherein the housing is held on the drive train on the first and on the second housing end. Between the first housing end and the coupling element is arranged a decoupling element, which is strictly springy or springy and damping in the axial direction, whereas the second housing end is braced rigidly against the drive train and the housing is braced with respect to the coupling element in the axial direction by means of the decoupling element.

A handpiece having a root canal length measurement function according to an exemplary embodiment may include: an angle having a portion made of a diffusion material for diffusing LED light from the LED light source, the portion including one side provided with a root canal treatment file for removing dental pulp inside the root canal and for expanding the root canal; a lip hook provided such that same can be cradled on the subject's lips; a body portion electrically connected to the file through a first terminal connector, into which a first terminal provided on the other side of the angle is to be inserted, and electrically connected to the lip hook through a second terminal connector, into which a second terminal of the lip hook is to be inserted; and an LED light source for emitting LED light from one end of the body portion.

A dental hand piece or angle piece including a rotating tool, which is driven via a rotating drive element disposed in a housing, wherein the rotating drive element is mounted in the housing by a radial rolling bearing, wherein the rolling bearing comprises an axial abutment surface and the housing comprises an axial countersurface, and wherein the rolling bearing is axially preloaded with respect to the housing by a spring element 11 and has a coefficient of friction for the static friction of the abutment surface to the countersurface or the abutment surface and the countersurface to the spring element that is at least 0.16 in the lubricated state and at least 0.25 in the unlubricated state.

A dental hand piece or angle piece including a rotating tool, which is driven via a rotating drive element disposed in a housing, wherein the rotating drive element is mounted in the housing by a radial rolling bearing, wherein the rolling bearing comprises an axial abutment surface and the housing comprises an axial countersurface, and wherein the rolling bearing is axially preloaded with respect to the housing by a spring element 11 and has a coefficient of friction for the static friction of the abutment surface to the countersurface or the abutment surface and the countersurface to the spring element that is at least 0.16 in the lubricated state and at least 0.25 in the unlubricated state.

A dual-ended triple tooled dental applicator apparatus, comprising a plurality of tools with interchangeable dental tool applicators. The dental apparatus further comprises an elongated handle having two distinct tools on both ends and being detachable and interchangeable. During procedures, the dentist can alternate between both ends of the apparatus and among three dental tool applicators. A set of overlapping and circumferential friction enhancement means, along and about the apparatus, facilitate safe and effective handling during procedures. The multi-functioned dental apparatus is comprised of a lightweight but rigid materials (e.g., plastic), which allows the dentist to efficiently use the same tool for working with and applying different materials to a patient's teeth. Upon completion of a given procedure, the entire device may be readily disposable.

A dual-ended triple tooled dental applicator apparatus, comprising a plurality of tools with interchangeable dental tool applicators. The dental apparatus further comprises an elongated handle having two distinct tools on both ends and being detachable and interchangeable. During procedures, the dentist can alternate between both ends of the apparatus and among three dental tool applicators. A set of overlapping and circumferential friction enhancement means, along and about the apparatus, facilitate safe and effective handling during procedures. The multi-functioned dental apparatus is comprised of a lightweight but rigid materials (e.g., plastic), which allows the dentist to efficiently use the same tool for working with and applying different materials to a patient's teeth. Upon completion of a given procedure, the entire device may be readily disposable.

A set of osteotomes have conical tips with free end diameters alternately increasing by a constant increment, k, as a step function, beginning with the first osteotome; and working base diameters alternately increases by a constant increment, C, as a step function, beginning with the second osteotome. For seven osteotomes, the first and second diameters respectively are: 1 mm and 2 mm; 1 mm and 3 mm; 2 mm and 3 mm; 2 mm and 4 mm; 3 mm and 4 mm; 3 mm and 5 mm; and 4 mm and 5 mm. In a first mode all seven osteotomes are used to provide very gradual diameter escalations. In a second mode the first, third, fifth, and seventh osteotomes provide conventional Summers' diameter escalations. In third and fourth modes the first, fourth, and seventh osteotomes, and the second, fifth, and seventh osteotomes respectively provide increasingly more aggressive Summers' type escalations.

A set of osteotomes have conical tips with free end diameters alternately increasing by a constant increment, k, as a step function, beginning with the first osteotome; and working base diameters alternately increases by a constant increment, C, as a step function, beginning with the second osteotome. For seven osteotomes, the first and second diameters respectively are: 1 mm and 2 mm; 1 mm and 3 mm; 2 mm and 3 mm; 2 mm and 4 mm; 3 mm and 4 mm; 3 mm and 5 mm; and 4 mm and 5 mm. In a first mode all seven osteotomes are used to provide very gradual diameter escalations. In a second mode the first, third, fifth, and seventh osteotomes provide conventional Summers' diameter escalations. In third and fourth modes the first, fourth, and seventh osteotomes, and the second, fifth, and seventh osteotomes respectively provide increasingly more aggressive Summers' type escalations.

A disposable prophy angle is provided, the prophy angle comprising a housing containing a drive shaft and a driven shaft; the drive shaft having a proximal end and a distal end and a longitudinal axis therebetween, the distal end having a substantially conical driving portion and a projection, the proximal end of the drive shaft configured to engage a dental hand piece; and the driven shaft having a driven portion comprising a recess configured for engagement by the projection and/or the substantially conical portion of the drive shaft to oscillate the driven shaft at an oscillation angle greater than 90 degrees. In some embodiments, there is a method of making a disposable prophy angle by overmolding a prophy cup to the prophy angle. In other embodiments, there is a method of using the prophy angle to prevent tooth decay.

A disposable prophy angle is provided, the prophy angle comprising a housing containing a drive shaft and a driven shaft; the drive shaft having a proximal end and a distal end and a longitudinal axis therebetween, the distal end having a substantially conical driving portion and a projection, the proximal end of the drive shaft configured to engage a dental hand piece; and the driven shaft having a driven portion comprising a recess configured for engagement by the projection and/or the substantially conical portion of the drive shaft to oscillate the driven shaft at an oscillation angle greater than 90 degrees. In some embodiments, there is a method of making a disposable prophy angle by overmolding a prophy cup to the prophy angle. In other embodiments, there is a method of using the prophy angle to prevent tooth decay.