A DENTAL BRIDGE AND MANNER AND MEANS FOR PREPARATION THEREOF

Abstract: A dental bridge (1) is described made of gold alloy and provided with sockets (2, 13) cast thereinto, through which sockets the bridge will be attached to anchoring elements (9, 10) attached to the jaw-­ bone of a patient. What is new is the sockets (2, 13) comprising a supporting part (3, 14) made of titanium, the outer surface of said supporting part being provided with retention means (5, 6, 15) for locking of the socket against axial movement. A manner of prepara­ tion of a such dental bridge and a socket (2, 13) being a means for carrying out the manner are also described.

Description: Technical field of the invention. The present invention is related to a dental bridge made of gold alloy and provided with sockets cast into said bridge, through which sockets the bridge will be attached to anchoring elements attached to the jaw of a patient and to a method for preparing said bridge. State of the art From Adell et al., Int. J. Oral Surg. 10 (1981), page 388 is known a dental implant system wherein a gold cylinder (k), which is attached with a gold screw (1), is intended to be cast into a bridge structure of gold alloy. Zarb and Symington in Proceedings of the Toronto Conference in Clinical Dentistry, J. of Prosthetic Dentistry, vol. 50, No. 2, page 272, have used a gold cylinder which was cast into a dental bridge of silver palladium alloy. Use of sockets which are machined gold details causes high costs for such implant systems. WO 85/02337 shows a dental implant in which a socket-shaped part 7 made of titanium or other material is attached by a screw joint against a corresponding cavity taken up in a dental bridge. However, it is not suggested to cast said part into the dental bridge. Description of the invention The object of the invention is to achieve a dental bridge at a lower cost than with previously known bridges, which bridge may prepared with a simplified procedure and using less details. According to the present invention it has surprisingly been found possible to prepare a dental bridge of the kind referred to initially wherein the sockets comprise a supporting part made of titanium the outer surface of which is provided with retention means for locking the socket against axial movement. It has thus been found that a strong and durable connection between the bridge and the sockets can be obtained without any chemical bond occurring thereinbetween, thus as is the case in use of gold cylinders. It has been found that sockets of titanium under certain conditions may be destroyed during the process of casting the sockets in. It has however been found that if one uses a gold alloy with a melting point not exceeding 1050°C this problem will be avoided. According to a further preferred embodiment of the invention the supporting parts of the sockets are made of titanium in commercially pure grade or of a titanium alloy comprising titanium, aluminium and vanadinum (e.g. 90:6:4), titanium, aluminium and iron or titanium, aluminium and niobium. The retention means of the sockets, for locking against axial movement, are preferably made as one or more grooves going around the supporting part thereof. The groove can preferably have the profile of a circle segment. The sockets may further suitably have retention means for prevention of rotation. These may comprise notches in the axial direction in the outer surface of the socket. The method for preparing a dental bridge according to the invention is carried out thus that sockets of titanium are cast into gold or a gold alloy having a melting point not exceeding 1050°C in a model casting process. The socket is characterized in that it has a supporting part made of titanium, the outer surface of which is provided with retention means for locking of the socket against axial movement. The supporting part is preferably made of the above-mentioned titanium alloy. The socket may in addition to the supporting part, which thereby at one end is provided with a supporting surface for bearing against a bearing surface of a spacing element attached to the jaw-bone of a patient, preferably be provided at the opposite end thereof with a tubular thin-walled extension which may form a channel through an impression material on modelling of a prosthetic part, and thereby enable the use of the socket also during the prosthesis building work. Suitably the tubular extension is made in one piece with the supporting part of the socket, and due to this, the socket in its entirety is preferably made of titanium. The invention is further described with reference to the appended drawings, where: Fig. 1 is a length section through a dental bridge according to the invention attached via an anchoring device implanted into a jaw, Fig. 2 is a section through a socket according to one embodiment of the means according to the invention, and Fig. 3 is a section through a socket according to another embodiment of the means according to the invention. A dental bridge of gold alloy according to the invention is denoted 1, and is provided with a titanium socket 2 cast thereinto, which socket has a lower supporting part 3 and a tubular extension 4 made in one piece with the supporting part of the socket. In the dental bridge in fig. 1 the extension is ground down to a suitable length at 4a. On the supporting part two round-going grooves 5 and 6 are arranged as retention means against axial movement. Between said grooves a number of axially directed notches 7 are arranged for retention against rotation. The socket is attached by a screw 8 against a pillar 9, which in turn is screwed into an osseointegrated root element 10. The dental bridge 1 is surrounded by a prosthesis 11 of acrylic material in which false teeth 12 are attached. The socket in fig. 3 is denoted 13 and has a supporting part 14 with a circular groove 15 serving as retention means against axial movement. At the end of the supporting part of the socket which is to be directed away from the pillar whereon it will be attached, the socket has a tubular extension 16. The dental bridge according to the invention may be prepared in the following manner: Bores for root screws 10 are drilled in the jaw-bone, root screws are screwed in and are allowed to osseointegrate in a known manner. After uncovering of the upper ends of the root screws, pillars 9 are screwed in, which are allowed to heal in under protection of a healing cap attached over the conical supporting surface thereof. The healing cap is removed and sockets 2 are placed thereon and attached by screws 8. If desired,a plastic impression material may be placed over the sockets for making an impression of the teeth of the opposite jaw, which impression is used by the dental technician in the final preparation of the prosthesis. The ends of the sockets are sealed with a plastic material, whereupon an impression tray filled with plaster is depressed over the sockets and the plaster is allowed to solidify. The seal over the ends of the sockets is removed, the screws 8 are released and the plaster impression is removed. Pillar dummies with conical supporting surfaces similar to the supporting surfaces of the pillars 9 are attached into the sockets by the screws 8 and cast into plaster. The first plaster impression is removed and broken down to release of the sockets 2, alternatively new similar sockets 2 are taken, and the sockets are mounted on the pillar dummies. A bridge structure is modelled of wax or plastic material, a mould is prepared by pressing the bridge structure into a mould compound and burning the wax or plastic material out in a burning oven. The gold alloy is thereafter cast into the mould to formation of a dental bridge 1 wherein the sockets are cast in and mechanically secured. An example of a suitable gold alloy is an alloy denoted DR 400 of the Ugdo brand, which is a so called class 4 gold, i.e. hard gold. Said alloy has the composition Au 720, Pt 30, Ag 140, Cu 101, Zn 9 and the melting temperature 885-895°C. Another suitable alloy is "Sjödings C-guld", which is a so called class 3 gold i.e. a somewhat softer gold which has the composition Au 765, Pt 29.5, Ir 0.5, Ag 85, Cu 115, Zn 5 and the melting temperature 880-945°C. In both cases the alloy is heated suitably to about 100° over the melting temperature. The mould is temperated suitably to maximum about 675°C.

Claims: A dental bridge (1) prepared of a gold alloy and provided with sockets (2, 13) cast thereinto, through which the bridge will be attached to anchoring elements (9, 10) attached to the jaw-bone of a patient, characterized in that said gold alloy has a melting point not exceeding 1050° C and in that the sockets comprise a supporting part (3, 14) made of titanium or a titanium alloy, the outer surface of said supporting part being provided with retention means (5, 6, 15) for locking the socket against axial movement. A dental bridge according to claim 1, characterized in that that the supporting parts of the sockets (3, 14) are made of titanium in commercially pure grade or a titanium alloy. A dental bridge according to one or more of the preceding claims, characterized in that the retention means comprise one or more grooves (5, 6, 15) going around the supporting part of the socket. Method for preparing a dental bridge according to any one of the preceding claims, characterized in that sockets (2, 13) of titanium, which sockets are placed in a mould, are cast into a gold alloy having a melting point not exceeding 1050° C. Method for preparing a dental bridge according to claim 4, characterized in that said sockets (2, 13) have a supporting part (3, 14) made of titanium, the outer surface of said supporting parts being provided with retention means (5, 6, 15) for locking the socket against axial movement. Method for preparing a dental bridge according to claim 5, characterized in that the supporting parts are made of titanium in commercially pure grade or of a titanium alloy.

Inventors: SOEDERBERG, PER OLOF, Söderberg, Per Olof
Applicants: ASTRA MEDITEC AB
Application year: 1988
Main classification: A61C8
IPC codes: A61C8