Abstract: Dental handpiece with an instrument section (1) for accepting a dental tool and with a second, hose section (2) which is capable of being detachably coupled to the instrument section and to which a media delivery line for the delivery of certain supply media for operation of the dental tool is capable of being linked, said dental tool being operated by a drive motor (3). The drive motor comprises a stator (9) and a rotor (5). The rotor (5) of the drive motor (3) is arranged in the instrument section (1) separate from the stator (9), the stator (9) of the drive motor (3) being arranged in the hose section (2). By virtue of the partial integration, in accordance with the invention, of the drive motor, the weight of the dental handpiece is diminished and the ease of handling of the dental handpiece is improved. In addition, higher working speeds of the dental tool can be achieved.

Abstract: The invention relates to a turbine handpiece (1), in particular for medical or dental-medical purposes, having a drive shaft (2), rotatably mounted in the forward end region of the handpiece (1), with which a tool can be connected by a mounting device, whereby there is arranged on the drive shaft (2), fixed for rotation therewith, a turbine wheel (4) in a turbine chamber (5), in which a delivery line (11) for a flowing pressure medium opens at an inlet opening (11a) and from which a discharge line (12) extends at an outlet opening (12a), whereby a apparatus (22) is provided which after a switching-off of the pressure medium supply, during the running on of the turbine wheel (4), prevents a release of the pressure medium rotating in the turbine chamber (5) through the discharge line.

Abstract: Method and device for the detection of caries in teeth (8). In order, after investigation of a tooth (8), to be able again to find the tooth location with the greatest incidence of caries, the instantaneous measurement value and the peak measurement value--which corresponds to the location with the greatest incidence of caries attack--are displayed. By comparison of the instantaneous measurement value with the peak measurement value the tooth location with the greatest incidence of caries attack can be localised when the instantaneous measurement value coincides with the peak measurement value.

Abstract: In the case of a medical or dental treatment instrument for the treatment of body tissue or a substitute material, in particular by cutting, with an elongated handpiece which in its front end region comprises a retaining device with a plug-in hole, into which the tool with its tool shank is capable of being inserted and is capable of being locked by means of a locking part which is movably supported transversely in relation to the tool shank between a locking position in which it is set into a locking recess in the tool shank and a release position releasing the tool shank and is pressurised into its locking position by the force of a spring, an actuating member which is manually accessible from outside is provided which is movably supported on the retaining device and with which the locking part is capable of being displaced into its release position, the actuating member being displaceably supported transversely in relation to the tool shank.

Abstract: Device for the recognition of caries, plaque or bacterial infection of teeth, the device having in substance a generator (4) for the generation of an excitation radiation (6) which with the aid of a dental handpiece (1) can be directed at a tooth (8) to be investigated, and a set of differently formed exchangeable emission and acquisition devices (2) for the irradiation of the tooth to be investigated with the excitation radiation (6) in dependence upon the surface of the tooth (8) to be treated in each case and for acquiring a fluorescence radiation (7) excited at the irradiated tooth (8). The individual exchangeable emission and acquisition devices (2) can each be removably coupled with the dental handpiece (1) and include a plurality of individual emission fibers (24a) and detection fibers (24b).

Abstract: A device for the recognition of caries, plaque or bacterial infection on teeth, which includes a light source for generating an excitation radiation which is to be directed onto a tooth to be investigated and producing an fluorescence radiation at the tooth. Also included is a detection device for detecting the fluorescence radiation of the tooth, and a spectral filter arranged in front of the detection device, wherein the wavelength of the excitation radiation emitted from the light source lies within the range of between 640 and 670 nm.

Abstract: System for the removal of a defect in a tooth (71), consisting of an oscillatingly movable tool (3) having working surfaces (56) for an abrasive making of a cavity (K) in the tooth, a filling material for filing the cavity (K), an insert (91, 91A) which can be placed into the cavity (K), which with regard to its surface region surrounded by the cross-sectional walls (KW) of the cavity (K) is pre-fabricated adapted to the dimension and shape, and a binding material (92), which hardens or cures, for bonding the insert (91, 91A) with the walls (KW) of the cavity (K).

Abstract: In a tool (1) for the preparation, with the removal of material, of a lateral cavity (K) in a tooth (Z), which tool has a tool shaft (2) of which one end is connected or can be connected with a dental handpiece (4) and of which the other end is connected or can be connected with a working body (14), the longitudinal middle axis (11b) of which working body extends approximately co-axially or axis parallel to the longitudinal middle axis (11a) of the tool shaft (2), and which working body has to both sides of a longitudinal middle plane (7) extending into its longitudinal middle axis (11b), lateral working surfaces (6) which each include an acute angle with the longitudinal middle plane (7), whereby the working surfaces (6) diverge in the direction towards the tool shaft (2), the working surfaces (6) have, at least in their longitudinal region (L3) towards the tool shaft (2), or over their entire length (L), a progressive divergence (18) relative to the middle axis (11b) of the working body (14).

Abstract: In the case of a laser instrument (1) with a laser-light guiding device (3) feeding the laser light, an oblong outcoupling element (15), the longitudinal direction of which is arranged at an angle (W4) in relation to the direction with which the laser light emerges from the guiding device (3), and with a laser-light deflecting device (26) which introduces the laser light emerging from the guiding device (3) into the outcoupling element (15), the deflecting device (26) is integrally moulded onto the outcoupling element (15).

Abstract: The invention relates to a dental treatment instrument with which a dental handpiece (1), at its instrument end and/or at its hose end, is provided with unlocking planes (4a, 4b) which cooperate with correspondingly complementarily formed unlocking planes (5a, 5b) of a dental treatment instrument (2) or of a hose connection (3) of a supply hose. The treatment instrument (2) or the supply hose (3) can, because of the cooperating unlocking planes (4a, 4b; 5a, 5b), be released by simple turning of the treatment instrument (2) or of the supply hose (3) relative to the dental treatment instrument.

Abstract: In a process for the curing of light-sensitive polymeric compositions by irradiation with light of wavelength suited to the polymeric composition it is proposed that the irradiation be carried out with a light intensity increasing continuously or in stepped form. An apparatus for carrying out said process is further proposed in which the raising of the light intensity is controlled during an irradiation procedure by a control unit (13).

Abstract: In a medical or dental laser instrument (1), especially for tooth root canal treatments, having a preferably rod-shaped hand piece (2), a connection part (3) by means of which the hand piece (2) can be connected to a supply line (4), a first light guide (5) that extends longitudinally through the supply line (4) and the connection part (3) to the hand piece (2), a second light guide (7) arranged in the front end region of the laser instrument, the rear end of the second light guide (7) being arranged coaxially with respect to the front end of the first light guide (5), and a coupling device (8) for coupling the laser light bundle leaving the first light guide (5) to the second light guide (7), the said second light guide (7) has a larger numerical aperture than the first light guide (5).

Abstract: A handpiece having a releasable retaining device for a tool having a shaft about which the tool rotates. The handpiece has a housing and a drive sleeve rotatably mounted in the housing. The drive sleeve has a hollow cylindrical insertion hole into which the shaft of the tool is placed. A drive means is provided for rotation of the drive sleeve. First and/or second releasable couplings are provided for rotatably and/or axially connecting the shaft to the drive sleeve. The releasable couplings have either a coupling slider or pressure member which is displaceable between coupling and decoupling positions. An actuating device is provided for displacing the coupling slider or pressure member into their decoupling position. In one embodiment the coupling slider is made of a ceramic material and fabricated into its final form by means of a single fabrication process without after treatment.

Abstract: In a device (51) for holding an in particular plate-like implement (52) serving for forming teeth, in particular a positioning calotte, in an articulator (1), having a holder (55) for the implement (52) which is held on the articulator (1), upon employment of an articulator (1) with a detachable upper part (37) and upon employment of only the lower part (35) of the articulator (1) the holder (55) is mounted on the joint parts (36) of the lower part (35) pivotably about the pivot axis (5) containing the joint parts (36).

Abstract: In a medical, in particular dental turbine handpiece, having a supply line (8) and a discharge line (9) for the turbine compressed air, whereby a valve (12) is arranged in one line, which valve is controllable by a pneumatic parameter in the other line, the valve (12) is arranged in the discharge line (9) and is so controllable that it closes when a limit value of the parameter in the supply line (8) falls below a minimum value.

Abstract: In a medical or dental treatment instrument, in particular a straight or angled handpiece (1), having a drive shaft (6) for a tool, which drive shaft is mounted in the forward end region of the treatment instrument, in at least one roller bearing (11, 12), rotatable around its middle axis (8), and is drivable for example by a turbine, whereby the roller bearing (11, 12) is blocked or sealed against contaminants with of a blocking ring (31) effective between its outer ring (37) and its inner ring (34). The blocking ring (31) bears with its surface facing the inner ring (34) on the inner ring (34) and is releasibly or non-releasibly attached thereon.

Abstract: A medical or dental handpiece having a grip sleeve formed with an outer gripping surface structure which provides improved grippability. The outer gripping surface structure is formed with alternate grooves and corrugations extending circumferentially around the sleeve and which, in cross-section, are axially spaced from each other. The grooves and corrugations are rounded concavely and convexly, respectively.

Abstract: In a tooth cleaning instrument (1) with an elongate handpiece, which carries a tooth cleaning tool (3) on its forward end, which can be set into vibration by a motor driven vibration generator (7) which is associated with the tooth cleaning instrument (1), whereby the tooth cleaning instrument (1) is connected or is detachably connectable at its rear end to a supply hose (6) having energy and/or media supply lines, the tooth contact element (17) is areal or quasi-areal and has a surface structure which is suitable for the abrasion of the tooth coating.

Abstract: In a straight motorized handpiece (101), in particular for medical purposes, preferably for a medical or dental laboratory, with a clamping device (106) arranged in a sleeve-like casing (111) for the selective clamping of tools (105) which can be inserted from the front into the handpiece (101), whereby the clamping device (106) is arranged on a drive shaft (107), which is rotatably mounted in the casing (111) by means of a rearward and a forward roller bearing (113, 114), whereby for axially retaining the drive shaft (107) a first shoulder (143) is provided on the casing (111) or on attachments thereto, against which the outer ring of one of the roller bearings (113) bears, and there is arranged a releasible arresting shoulder (145) opposite to the first shoulder (143) at an axial spacing, the first shoulder (143) is arranged on the outside of the outer ring of the associated roller bearing (113) and the arresting shoulder (145) is arranged on the outside on the other roller bearing (114), the drive shaft (1

Abstract: A method for the optical three dimensional measurement of a tooth without calibration bodies. An optical projection system projects a pattern onto a tooth, and an optical imaging system images the pattern projected thereon, from a first position in space and subsequently from a second position in space, with the images from the two positions in space having a common imaged area of the tooth. The image patterns are evaluated to calculate three dimensional coordinate data of the tooth surface relative to the respective imaging position for each image and also for the two images combined, to produce a single three dimensional tooth surface data record. In this method, points and/or surfaces are selected from the common imaged area with the aid of properties of the tooth surface contour which are invariant under displacement and rotation, so that they can be clearly correlated with each other.