Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1989-05-16
1991-10-01
Stone, Cary E.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433213, 433229, A61C 13225
Patent
active
050529285
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for producing by mechanical means a bridge made of titanium for anchorage elements implanted in the dentine of a tooth. The aforementioned bridge constitutes the framework for an artificial dental structure, and the dental structure is capable of being attached to the anchorage elements via the bridge. The bridge is of the kind which is built up of modular elements which are treated for the purpose of adapting them one to the other and of being joined together. The invention also relates to an arrangement for the execution of the aforementioned method.
The implantation of titanium pins in the jaw and the anchorage of a bridge structure to these pins has already been disclosed. The bridge structure in this case consists of a framework made of an appropriate material and an artificial dental structure built up on the frame, which dental structure is secured to the pins with screws, preferably made of titanium.
This kind of framework is associated with the need to be able to achieve rational production without being obliged to depart from the requirement for an accurate fit on the pins. The degree of lateral accuracy is high (e.g. 10.sup.-2 mm). Furthermore the requirement in respect of the strength of the bridge is high, a at the same time the bridge framework must be capable of being accommodated within the dimensions of the artificial dental structure. The requirement imposed on the artificial dental structure is that it must correspond to the natural situation which it is to replace.
The above problem is accentuated by the fact that the bridge structure exhibits a high degree of individuality, and the implants can impart different inclinations and heights to the attachment points for the bridge structure. In spite of this there is a wish for an accelerated manufacturing operation and arrangements for the manufacture of a bridge structure of this kind.
The object of the present invention is to create a method which will resolve, amongst other things, the problem outlined above, and the method may accordingly be regarded as being essentially characterized in that, in conjunction with the performance in a treatment unit of one or more first treatment stages for the construction of the bridge, identification data introduced or utilized in the one or more first treatment stages relating to the individual different heights of the anchorage elements above the dentine or a plane passing through same, and different relative inclinations and the positions and directions of the modular elements in relation to one another and to the anchorage elements are obtained and stored, and in that a processing unit which performs a subsequent processing stage is controlled depending on the data thus obtained and stored, so that any bridge elements present in the bridge between the attachment components of the bridge in the anchorage elements are assured a connection via contact surfaces, and directions and dimensions between the attachment components are essentially in line with the direction of the dentine in the sense of its height and width, at the same time with the necessary strength and location within the dental structure.
In a further development of the idea of the invention use is made in the manufacturing process of a working model which constitutes an internal impression of the jaw. The working model is secured to a component which forms part of the treatment unit and is so arranged as to be capable of displacement and/or rotation in its own plane. Contact surfaces between two first modular elements situated adjacent to one another in the bridge are produced in a first displaced and/or rotated angular position of the part, and so on. Data relating to the first and second displaced and/or rotated angular positions of the part are recorded and utilized in a joining machine, for example a welding machine (laser welding machine), forming the processing unit, for the purpose of joining together modular elements at the produced contact surfaces.
The aforementioned processing devic
REFERENCES:
patent: 3068572 (1962-12-01), Gobby
patent: 4324546 (1982-04-01), Heitlinger et al.
patent: 4708654 (1987-11-01), Branemark
patent: 4767328 (1988-08-01), Branemark
Nobelpharma AB
Stone Cary E.
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