Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1995-12-05
1998-05-19
O'Connor, Cary E.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433173, A61C 800
Patent
active
057528284
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an arrangement for fixing a prosthetic construction unit to an implant. Examples of implants which may be mentioned are those formed in the dentine.
BACKGROUND OF THE INVENTION
It is already known to anchor prosthetic constructions, such as dental caps, dental bridges, dental bridge parts, etc., to one or more implants. The actual anchoring is effected by screws which are screwed essentially in the axial direction of the implant.
In the proposed application screws, often emerge in parts of the construction which are exposed, for example chewing surfaces which are exposed to considerable forces (chewing forces). Even if the respective screw head is covered over with material, there may be problems in obtaining optimal strength in the constructions, and there may be difficulties, from the technical point of view, in achieving an optimal external shape, satisfactory appearance, etc. The invention solves this problem, among others.
There is also a requirement to use anchoring elements of types other than screws, which in some cases can be of critical importance for establishing a reliable anchoring force, and the material of which screws should last for the long period of use of the prosthesis in question. Thus, for example, the limits of elasticity of the screws may be exceeded, which leads to a deterioration in the quality of the anchoring function, and has a weakening effect difficult to detect. The present invention solves this problem too.
Furthermore, there is a need to establish a simplified technique for anchoring prosthetic constructions to implants. The present invention solves this problem too.
The characterizing feature of the present invention is that the unit and the implants comprise control parts which can cooperate with each other and which are intended, when they are brought together, to impart to the unit a distinct position on the implant. Further characteristics are that the said control parts on the unit and the implant are designed with recesses arranged to receive an element which extends essentially in the transverse directions of the implant and of the unit and which, in the applied position, bears in the one control part of the said control parts and acts on the other control part such that a pressing force, acting in the axial directions of the unit and of the implant, is obtained for pressing the unit against the implant.
In further developments of the inventive concept, the element is designed with an eccentric part which, in a first position of rotation of the element, allows the element to be applied in the recesses of the control parts, and, in one or more other positions of rotation, presses against a cooperating surface on either of the control parts. The element can in this case preferably have a dual bearing in the first control part. Thus, in its dual-bearing suspension, the element cooperates with the other control part via the eccentric part. The control part secured to the implant can preferably have one or more spaces or compartments which extend in the at least essentially longitudinal extent of the implant and in which the control part(s) of the construction unit can be applied. In a corresponding manner, the control part of the construction unit can instead comprise one or more compartments in which the control part(s) of the implant bear(s).
In one embodiment, the element can comprise a head-shaped part which can be mounted in a recess in a first portion of the one or the first control parts. The element can also comprise a pin-shaped part which can be mounted in a second portion of the said first control part or control parts. The said eccentric portion is arranged between the said head-shaped and pin-shaped parts. The head-shaped portion preferably has a central recess, of square or hexagonal shape, via or with which the element can be rotated about its longitudinal axis using a tool of a type which is known per se.
The implant or the unit can comprise two parts or plates which are arranged in parallel and whic
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Andersson Matts
Johansson Ulf
Nobel Biocare AB
O'Connor Cary E.
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