Dentistry – Method or material for testing – treating – restoring – or... – By filling – bonding or cementing
Patent
1986-11-12
1988-08-16
Wilson, John J.
Dentistry
Method or material for testing, treating, restoring, or...
By filling, bonding or cementing
4332281, 433229, 1562722, A61C 504
Patent
active
047641185
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the positioning and fixation of pieces added on a support.
More especially, the invention relates to the positioning and fixation of prostheses constituted by a rigid element added and connected on a support which is itself rigid, such as a tooth or an osseous member.
The invention relates more particularly to the connection of dental prostheses such as an inlay intended to fill in a cavity or to complete a missing part of the tooth further to the development of dental decay or to accidental breaking thereof.
The invention may generally be applied to all operations aiming at ensuring connection of a rigid piece or block intended to be added on a rigid support; however, the invention will be described hereinafter more especially in its preferred application which concerns the positioning of prostheses, particularly in the domain of dental surgery.
The repair of the dental apparatus, particularly at the level of a tooth degraded by decay or of which the entirety has been modified or attacked accidentally, aims at reconstituting the profile and shape of the tooth, so as to allow the latter to perform its role in the buccal and dental assembly, ensuring the optimum conditions of physical and biological stability for the structure thus reconstituted.
The practician conventionally treats slight, superficial attacks by a mechanical cleaning of the gap constituted in the structure of the tooth, creating a cavity of which the walls rendered healthier may receive a filling material generally positioned by moulding.
In this case, the joining of the material (amalgam or cement) is obtained by crimping the material in the cavity of which the edges are narrow or by micro-keying of the stopping material in the micro-retentions created on the surface of the walls of the cavity to be stopped.
These conditions define the limits of the domain of application of these conventional techniques; in particular when the size of the missing part to be replaced does not make it possible to constitute a cavity with narrow edges allowing a crimping effect.
In the latter case, it is then necessary to make a prosthesis representing the missing part of the tooth which must be positioned and joined exactly on the healthy part to ensure for the whole the shape and contour of the reconstituted tooth.
This prosthesis or inlay (pre-fabricated in the workshop in conventional manner and from an impression of the jaw object of the treatment) must therefore be connected to the remaining part of the tooth and which was previously rendered healthier so as to reconstitute the tooth in its operational form.
Connection of the dental prosthesis, particularly constituted by an inlay, is obtained by gluing by means of an appropriate bonding agent or adhesive and among which various resins are used.
Polymerization of the resin in situ constitutes the interface ensuring connection between the wall of the cavity and the wall coming into register and of profile complementary of the prosthesis.
Initiation of the reaction of polymerization which will allow the hardening of the bonding agent and connection of the prosthesis in its receiving location is generally obtained chemically.
This means that the resin which constitutes the adhesive is therefore mixed immediately before its use with a second component comprising a catalyst of polymerization and constituting the hardener.
The use of this method of chemical gluing supposes the carrying out of prior operational phases aiming at giving the wall of the receiving cavity an appropriate surface state allowing a maximum spread and consequently an efficient adherence of the bonding agent on this wall, in order to obtain both a good cohesive bond (between the adhesive and the support material) and a good adhesive bond (within the adhesive material itself).
Presently used adhesive resins with polymerization by the chemical process give cohesions which are satisfactory on the whole but which create delicate problems when employed.
These problems are caused by the fact that it is by defi
REFERENCES:
patent: 3423829 (1969-01-01), Halpern et al.
patent: 4272589 (1981-06-01), Dubois et al.
Touati Bernard
Werly Marc
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