Other

Proceq Sa

Contraves Ag

Proceq Ag

Marco Brandestini

Werner H Moermann

Hans R Muhlemann

Peter Stierli

Dietmar Leeb

Ernesto Steiner

Device for determining wear in a carbon ceramic brake disk. The device includes a coil arrangement having at least one coil structured and arranged to generate a magnetic field in the brake disk and to detect an eddy current in the brake disk, and an arcuate measuring area.

Device for determining the wear of a carbon ceramic brake disk

Measuring instrument

An apparatus and a method are described that determine the compressive strength of a solid by rebound. The method and apparatus have a reduced sensitivity to error sources, i.e. gravity, internal friction and operator interference (unsteady holding of the instrument). The improvements are achieved by contactless measuring of the quotient of rebound to inbound velocity recorded immediately before and after the impact. Matching the mass of the mallet () to the plunger () yields higher efficiency, less angular variation of the impact energy and lighter weight. Added benefits of the invention are: Extended range of measurement and simplified mechanical adjustments, calibration and maintenance.

Method and apparatus for the non-destructive measurement of the compressive strength of a solid

The apparatus comprises an actuator () that can be pushed from an extended position to a depressed position. When doing so, the actuator () first releases an impact body () to impinge against the sample (), and then a catcher () to be moved to the released impact body () for bringing it back. The passage of the impact body () is detected by a reed switch (), which wakes up the processing circuitry and switches the same between two modes of operation. In the first mode, the circuitry displays a device status, and in the second mode a measuring result.

Apparatus for hardness measurement by impact

The method provides a means for a dentist to record the shape in situ of teeth prepared for repair. During a search mode, a high resolution grey scale image is presented on a monitor. The scan head is positioned over the prepared cavity, using this visual feedback. A trigger initiates actual 3D data acquisition, which is accomplished in a fraction of a second using an active triangulation principle. The result is stored in congruent memory banks in the form of a 3D profile and a pseudoplastic grey scale image representing the back-scattered contrast. The pseudoplastic contrast image is displayed instantaneously on the monitor. The point to point relationship between the pseudoplastic grey scale image and the 3D profile allows use of the grey scale display as a drawing plane for operator data verification and editing. The contour lines defining the desired restorative implant appear as an overlay to the grey scale image, while the actual positional values of points on the contour lines are stored in and retrieved from the 3D profile. The contrast-derived pseudoplastic image not only provides higher intelligibility for the operator; but data processing algorithms can also make use for each image point of both sets of data, that is the 3D profile and the contrast image.

Method and apparatus for the three-dimensional registration and display

A method and apparatus for machining a custom-shaped dental restorative part from a blank of dental material yield the entire part in a single operation, and include a workpiece being mounted on a support member which facilitates rotation and axial movement of the workpiece. A separating disk is used for almost the entire machining operation, and an additional tool in the shape of a burr can optionally be provided to shape more elaborate pieces. The disk and burr are supported by a tool holder which is supported for movement parallel to and rotationally about an axis. The disk and burr are powered by a closed loop fluid supply arrangement. A tool velocity sensing scheme is utilized for adaptive feed and to compensate for tool wear. The machining mechanism and associated control circuitry are enclosed in a common cabinet so as to provide a mobile unit suitable for use in a dentist's office.

Method and apparatus for the custom shaping of dental inlays, onlays,

A blank adapted for use in custom fabrication of an implant for dental restoration includes first and second joined parts. The first part is made of the raw material of the ultimate implant, whereas the second part can be made of a different material. The second part is shaped to facilitate a positive support of the blank in a milling machine, and is preferably equipped with a code-bearing surface which permits information about the physical properties of the blank to be sensed by the machine. In a preferred realization, the first part is made from ceramic silica and the second part from aluminum, and the two are bonded by an acrylic glue.

Blank from which a dental implant can be machined, and a method of

The surface characteristics of an organ that needs restoration, for example, a tooth which has been prepared for an inlay insertion, are read by means of a noncontact scan-head. The three-dimensional shape parameters of the implant required to restore the tooth in function and appearance are computed on the basis of the recorded contour data. These parameters are then used in a program sequence which controls a milling, cutting or erosive process in order to manufacture the restorative inlay while the patient waits.

Method and apparatus for the fabrication of custom-shaped implants

An identification plate of gold alloy is inserted in a small blind hole drilled into the crown of a tooth. The hole is then filled with a durable filler which hardens around the plate to embed it in a durable, heat resistant filling. The filling material can be colored so that it is readily located when identification is desired. For making the identification, the filler is dissolved away to leave the plate, which can be read by means of optical magnification. Also disclosed is an electrical device especially adapted for providing plate blanks with the desired identifying information.

Method of providing a living person's body with information for forensic

A method and apparatus for determining a change of the flow state of a flowable substance by transmitting ultrasonic or ultrasound waves of constant frequency to a spatial region of the substance, receiving ultrasonic waves backscattered by the substance, converting the backscattered ultrasonic waves into a primary signal which is amplitude- and phase-modulated in accordance with the backscattering and demodulating the primary signal in order to obtain a modulation signal. This modulation signal can be divided into a spectrum of signal components of different frequency and possessing pseudo periods which are defined as the time intervals between successive momentary values of the modulation signal, such momentary values corresponding to one another. The time duration corresponding to a predetermined number of pseudo periods is compared with a predetermined time duration.

Method and apparatus for determining a change of the flow state of

A method of, and apparatus for, testing the hardness of a material by means of an impact device wherein an impact body having a test tip or point which is either integrated, e.g., connected with, or separate from, the impact body is brought to impact against the material to be tested. There is determined the velocity of the impact body and/or the test tip both directly before and after impact, and there is then formed a characteristic value from both velocities which is utilized as criterion for the hardness of the material.

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Zurich, Switzerland

Marco Brandestini