Dentistry – Method or material for testing – treating – restoring – or...
Patent
1995-12-05
1998-12-22
Wilson, John J.
Dentistry
Method or material for testing, treating, restoring, or...
433223, A61C 500
Patent
active
058511156
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for collecting control data or manufacturing data: for example, data on cutting coordinates for one or more machines or manufacturing systems; for production of artificial support members; or replacement parts for the human body. The members and parts preferably include dental bridges, dental caps, or other dental articles to be placed in the mouth cavity. The method utilizes stereophotography in which each imaging is carried out from different angles in relation to the relevant body areas, for example the jaw, teeth, etc., which are to be provided with the support members or replacement parts. The present invention also relates to an arrangement for implementing the method. The data collected can also be used for blasting fungi in the mouth cavity.
BACKGROUND OF THE INVENTION
It is already known to provide devices and methods for collecting control data, in which a model is produced and is scanned by reading equipment, and in which the shape of the model can be represented by, or with, digitized data which is processed or used in computer equipment for production of the manufacturing data.
It is also known to use equipment for stereophotography of, for example, the mouth cavity of a patient, the photographs being used for determining the positions of the implant and the like in the mouth cavity. The determination of the positions of the implant can in this case be carried out photogrammetrically.
DESCRIPTION OF THE INVENTION
TECHNICAL PROBLEM
The use of models entails relatively complicated and time-consuming procedures for the designing and production of implants and artificial support members for dental bridges, dental caps, etc. The model is produced by, among other things, taking an impression in the patient's mouth. Many patients cannot tolerate, or are averse to is such impression techniques. There is therefore, a need for simplified methods and arrangements, for example, in the production of dental bridges. The invention is directed to solving this problem.
The use of models, in itself, results in relatively large sources of error in the finished constructions which, on account of inadequate fitting, build static stresses into the patient's mouth and which, in the long term, cause the collapse of parts of the jaw bone despite the fact that the stresses are relatively small. The invention aims to solve this problem too, and it proposes a method and device which make it possible to eliminate built-in forces of this kind.
The use of stereophotography and photogrammetry for establishing the positions of teeth and implants in the mouth cavity should in itself be able to obviate the use of models which are produced using an impression compound in the patient's mouth. However, equipment used hitherto for stereophotography has proved to be impractical when employed in connection with dental work in the mouth cavity. Stereophotography involves imaging the same jaw area or implant/object from different angles, and this means that it has hitherto been proposed to use several cameras which have been coordinated in terms of their function. The equipment becomes complex, and it is difficult to prevent the movements the patient makes between the exposures from affecting the result. The invention solves this problem too.
Computer equipment for production of dental articles is beginning to be introduced to an ever greater extent on the dental market. It is important to use computer equipment (personal computers) having easy-to-follow instructions so that the equipment can be used by persons who are not computer experts. The invention solves this problem too. This applies also to the proposed camera equipment which, according to the invention, is calibrated for high-quality use in connection with manufacturing and has a user-friendly construction. It is important that the camera equipment be of a conventional type and does not require the use of advanced photography techniques for taking pictures. The invention solves this problem too.
Identificatio
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Carlsson Lennart
Lie Anders
Nobel Biocare AB
Wilson John J.
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