Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1996-06-03
1998-10-06
Lucchesi, Nicholas D.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433172, A61C 800
Patent
active
058168109
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for producing elongate supporting parts for replacement constructions, for example, in dentures in a human body.
An example of such a supporting part is the "skeleton" of a dental bridge. Each supporting part is intended to be secured in an implant (spacing member thereof) with, as a rule, unique longitudinal axis.
The novel method uses one or more impression models/working models. In each model, the longitudinal courses and connection surfaces of the implants are represented with representation members (dummies). The method also uses a replacement construction model, as well as a surface-reading member, by means of which the shape of the replacement construction model is read, and one or more electrical representations of all, or parts, of the respective shape are generated as a function of the reading. Also included is equipment for producing machining information which preferably comprises computer equipment by means of which one or more items of machining information are generated as a function of the representation(s).
The method also includes the use of one or more electro-erosion devices. The computer equipment (or equivalent) is, in this case, arranged so that it is supplied with each representation obtained from each reading. The computer equipment is also capable of establishing one or more calculations, and/or one or more uses, of the last-mentioned representation or representations in turn to generate one or more second representations which are used as the said machining information items.
The invention also relates to a supporting part for a replacement construction which is intended to be applied in the human body and is in this respect arranged to be anchored in an implant, for example in dentine. The supporting part is furthermore provided with connection members via which securing elements, for example in the form of screws, for anchoring of the replacement construction in the implants which in this case generally have different, unique longitudinal courses.
BACKGROUND OF THE INVENTION
It is already known to manufacture supporting parts, for example for dental bridges, each supporting part, as a finished product, being in the form of a single unit which can be produced from a biocompatible material, for example titanium. Thus, for example, it is known to produce a number of modular elements which are put together to form the unit.
It is also known, when manufacturing dental caps for individual teeth, to use computer technology and mechanical procedures which reduce manufacturing time and permits the high precision which is necessary.
It is also known, in conjunction with the production of dental caps, to use surface-reading members, by means of which outer shapes can be read, and electro-erosion devices for forming recesses in the supporting part itself.
DESCRIPTION OF THE INVENTION
When manufacturing bridges and replacement constructions, there is a need to be able to use computer aids in combination with improved manufacturing methods which place fewer demands on the experience and training of the personell involved and which improves the manufacturing throughput times. In addition, the manufacturing accuracy must be extremely high so that strict requirements relating to fitting in or on the patient can be satisfied. The invention solves this problem, among others.
The invention also solves the problem of eliminating the use of dental bridges which are made up of modular elements, which have the disadvantage that the longer the supporting part (i.e. the more teeth to be included), the greater the overall error as regards the fit. Thus, by means of the invention, longer replacement constructions can be produced with the prescribed accuracy.
The invention also solves the problem of using conventional scanning and electro-erosion devices in conjunction with the production of dental bridges/elongate supporting elements, even where there are considerable differences in the mutual inclinations between the implants.
SUMMARY OF
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Antonson Izidor
Carlsson Lennart
Lucchesi Nicholas D.
Nobel Biocare AB
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