Gear cutting – milling – or planing – Milling – With regulation of operation by templet – card – or other...
Patent
1992-04-08
1994-06-14
Briggs, William
Gear cutting, milling, or planing
Milling
With regulation of operation by templet, card, or other...
409131, 356376, 433223, B23C 100, B01B 1124, A61K 606
Patent
active
053204620
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a method of producing restorations, prosthesis or the like within dentistry and medical service, a measuring device, a computer and a shaping machine being utilized.
According to common technique within dentistry when repairing the teeth the dentist after having drilled the tooth that shall be filled makes an impression of the tooth. Thereafter a model of the tooth is made in plaster, which is utilized by a dental technician as a model when waxing and moulding the restoration. This method is very troublesome and time-consuming and creates many sources of errors. Therefore, new methods of producing restorations and dentures within dentistry have lately began to be developed.
According to a method described in European Patent No. 0 054 785 there is previously known to make an optical reading of the form of the cavity of the tooth. This information is transmitted to a computer, a manual completion of the information being made. The computer controls a milling-machine which shapes a material, whereby a restoration is produced with a form which is similar to the form of the cavity. According to another method which is described in the U.S. Pat. No. 4,182,312 there is previously known to convey a probe around in the cavity of the tooth, the form of the cavity being detected. The information from the probe is transmitted to a shaping machine in a mechanical way, which prepares a restoration with a form which is similar to that of the cavity. None of these two methods, however, gives a satisfactory result but additional working is required.
SUMMARY OF THE INVENTION
This invention relates to a method that shall produce restorations, prosthesis or the like, which have better fit than restorations and prosthesis produced according to known methods. This has been made possible by the method according to the kind mentioned by way of introduction, which is characterized by the combination of the following moments:
A measuring probe provided with at least two lighting points and being an integral part of a measuring device provided with at least two cameras is conveyed along the treatment area at the same time as the movements of the measuring probe are registered by means of the cameras;
Data from the cameras are collected by and stored in a computer which is specially programmed for this field of use and which on basis on incoming data can determine the form of the treatment area;
The data information stored in the computer is utilized for controlling a shaping machine which out of a working piece shapes a suitable restoration or prosthesis.
An essential advantage with this new method is that the form of the treatment area can be determined even if this one is not visually available. According to the new method every separate measuring point in the space becomes evidently defined regarding xyz-coordinates. These measuring data are stored in the computer and can then be the base when shaping the working piece in the shaping machine.
BRIEF DESCRIPTION OF THE DRAWING
In the Drawing
The FIGURE is a schematic view of a device embodying principles of the present invention.
DETAILED DESCRIPTION
A preferred embodiment of a device for measuring the form of a treatment area inside the mouth of a person for instance shall be described more closely with reference to the accompanying drawing. This device is very suitable to use for measuring the form of holes for instance in the teeth made by means of drilling. In that connection the device measures and calculates the internal contour of the cavity of the tooth.
The device comprises two cameras 1, 2, which is suitably of CCD-type. These cameras are intended to register the position of light emitting diodes from different directions and accordingly function as transmitters and/or receivers. The cameras are intended to cooperate with a measuring probe 3 having a point 4. This point is intended to be conveyed along the surface of the cavity for instance. The measuring probe 3 further comprises three lighting points 5-7
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Johansson Gunnar
Sjogren Goran
Sundh Anders
Bergman Maud
Briggs William
Johansson Gunnar
Sjogren Goran
Sundh Anders
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