Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
2000-02-22
2001-08-21
Manahan, Todd E. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
C433S201100
Reexamination Certificate
active
06276938
ABSTRACT:
TECHNICAL FIELD
The present invention relates inter alia to a method for executing a cemented superstructure on one or more distance member(s) which can respectively be mounted on an implant assigned to it (them) in the jaw (human jaw) by means of a screw member. The invention also relates to an arrangement for such a cemented superstructure in the jaw, where one or more distance member(s) can be mounted on implants assigned to it (them) with the aid of screw members. In the finished state, the superstructure has no access passage for the respective screw member(s). The invention also relates to a set of distance members which can respectively be mounted on an implant assigned to them in the jaw by means of a screw member, where one or more distance member(s) is (are) intended to form part, in the jaw, of a cemented superstructure which, in the finished state, has no access passage for the respective screw member(s). The invention also relates to a distance member for making possible a cemented superstructure in the jaw, which member can be fastened to the implant in the jaw by means of a screw member.
STATE OF THE ART
It is previously known to form a cemented superstructure on distance members anchored in implants in the human jaw. It is also previously known to design distance members with counterholders in order to prevent the transmission of torsional or torque forces to the implant in connection with tightening by means of tools. As an example of other counterholding functions in connection with such tools, refer inter alia to Swedish patent 466 786. It is also previously known to individually adapt distance members to different dental situations. In different dental situations, it is also previously known to make use of screw member sets, from which the selection for the situation concerned can be made.
DESCRIPTION OF THE INVENTION
TECHNICAL PROBLEM
In a cemented superstructure, problems arise inter alia because there are no access holes for the respective screw member(s) in the finished structure. During adjustment and repair work in such structures, difficulties thus occur with regard to freeing these structures from the implants without the risk arising of the structure and/or the implants being destroyed. Measures aimed at reducing to the greatest possible extent the requirement for carrying out repair work on finished superstructures involve placing special demands on the screw joints so that these do not loosen on the dental bridge or dental crown once it has been completed. It is also important that the components forming part of the dental bridge or equivalent can be designed and constructed so that the technical dental work is facilitated to the greatest possible extent. Major grinding-down and shape modification work during production of the superstructure and cementing are preferably to be avoided, not least out of consideration for the patient. This also applies to impression-taking and model-production work.
The invention aims to solve inter alia these problems. By means of the invention, it is possible, for example, to obtain a visual indication of the delimiting line of the dental bridge or dental crown in relation to the respective distance piece. By means of the invention, great adaptability to different individual appearances and positions in the jaw is also made possible, which is a necessary prerequisite because of the great individual differences represented by patients. It is also important that the distance member set can provide for shapes that can be related to existing incorporation-type distance pieces. It is thus important, for example, that the distance members have cone angles that essentially correspond to those of incorporation-type distance pieces so that bone and soft tissue do not get in the way when the distance members are mounted. The invention also solves these problems.
SOLUTION
The new method according to the above can mainly be considered to be characterized in that a set of distance members which are intended for different individual dental situations is provided, in that each respective distance member in the set provided is made with an internal counterholder for a tightening tool that is used when tightening the respective screw member, which counterholder prevents torque being transmitted from the tightening tool to the implant during tightening, in that a considerable number, preferably at least 80%, of the distance members in the set are individually externally shaped so as to provide for individual anatomical shapes which are impressed on the cementing function and which are optimized for a number of main types of dental situations, by means of which impression substantial modification work on the respective anatomical shape in connection with construction of the cemented superstructure in the jaw is essentially rendered unnecessary, and in that one or more distance member(s) that is (are) optimum or most practicable for the given dental situation is (are) selected from the set of distance members provided.
An arrangement according to the type indicated in the introduction is characterized by the following combination, that is to say in that each respective distance member is made or provided with an internal counterholder member for a tightening tool, which counterholder member is designed to prevent torque being transmitted from the tool to the respective implant in connection with tightening of the respective screw member, in that each respective distance member has a prefabricated external shape which is essentially individualized to the given dental situation, and in that the prefabricated individual external shape of the respective distance member is likewise designed to comply with the cementing function requirements involved without the need for substantial shape modification work during construction of the superstructure.
The new set of distance members can mainly be considered to be characterized by the following combination, that is to say in that the distance members are designed with prefabricated individual external shapes which are adapted to main types of different dental situations, in that the prefabricated individual external shape of a considerable proportion, at least 80%, of the set is designed to comply with the cementing function involved without the need for substantial shape modification work during construction of the superstructure in the jaw, and in that each respective distance member is made or provided with an internal counterholder member for a tightening tool, which counterholder member is designed to prevent torque being transmitted from the tool to the implant concerned in connection with tightening of the respective screw member.
Embodiments of the set of distance members emerge from the subclaims below.
A distance member according to the invention can mainly be considered to be characterized by the following combination which is characterized in that the distance member is assigned a prefabricated external shape, in that the prefabricated external shape is individually adapted to a given dental situation for the purpose of rendering unnecessary substantial shape modification work in connection with construction of the superstructure in the jaw, in that the prefabricated shape has a shelf-shaped projecting part or projecting flange located between the upper and lower parts of the distance member, and in that the distance member is or can be designed with an internal counterholder which prevents torque being transmitted from the tool to the implant.
Embodiments of the distance member according to the invention emerge from the subclaims below.
ADVANTAGES
By means of the above proposals, it is possible to propose a distance member set which complies with a very large number of main types of dental situations, which in turn means that considerable optimization is possible for the majority of dental situations. Use can be made of existing principles with regard to tightening tools with counterholders. Visual indications of the connection of the replacement material to the distance member a
Jorneus Lars
Kvarnstrom Bjarne
Connolly Bove & Lodge & Hutz LLP
Manahan Todd #E.
Nobel Biocare AB
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