Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1991-06-17
1993-01-12
O'Connor, Cary E.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433176, A61C 800
Patent
active
051785390
DESCRIPTION:
BRIEF SUMMARY
The invention relates to dental implants for implanting in the lower or upper jaw to serve as a support for a dental prosthesis, crown or bridge, after the total extraction of one or more teeth. Generally, these implants are formed by a member insertable in the bony tissue and a head, termed implant head, which is fixed on the insertable member and receives the prosthesis.
U.S. Pat. No. 3,732,621 describes a dental implant in which the head and the insertable member are interconnected by a ball joint to permit the inclination of the head with respect to the insertable member. The locking in position is ensured by a lock screw or by putting a flexible tie such as a cable under tension. The dental implant described in this document has a relatively complicated structure.
There has also been proposed (U.S. Pat. No. 4,758,161; U.S. Pat. No. 4,276,026 and U.S. Pat. No. 4,645,453) an implant head in a single piece having a thinning down permitting the bending of said head. The requirements of strength and rigidity limit the thinning down and this imposes the bending of the head outside the mouth and may consequently render the mounting of such a head in an implant located between two teeth impossible because of the clearance required when screwing the bent head. Further, a part of the head, i.e. the base, is not bent, which in particular has a disadvantageous repercussion on the construction of the prosthesis.
The invention therefore has for object to remedy the drawbacks mentioned hereinbefore by providing a dental implant capable of being suitably angularly and circumferentially disposed. Another object of the invention is to provide such a dental implant which is easy to produce and use.
The invention therefore provides a dental implant for implanting in the lower or upper jaw to serve as a support for a dental prosthesis and comprising a member, such as a screw-threaded stem, blade or the like, which is insertable in the bony tissue of the receiving jaw so as to ensure the anchoring of the implant and which comprises a straight, in particular cylindrical, part an end of which is flush with the surface of the jaw when said member is inserted in the latter, and an implant head which is detachably connected to said member and on which the dental prosthesis is mounted, in which implant the insertable member and the head are interconnected by a ball joint allowing the orientation of the head with respect to the insertable member so as to permit the suitable angular and circumferential positioning of the head with respect to the receiving jaw and in which there are provided means for ensuring the immobilization of the head in said suitable position and, in the straight part of the insertable member, a cylindrical cavity extending concentrically with the longitudinal axis of said part and prolonged into the head through a second cylindrical cavity, concentric with the longitudinal axis of the head, said implant being essentially characterized in that there is provided in said cavities an element which connects the head to the insertable member and is bendable, in the mouth, in the vicinity of the center of the ball joint. Bendable element is intended to mean an element which itself retains the shape, i.e. the inclination, imparted thereto by bowing.
Preferably, when finally mounting the head, the cavities in the insert member and implant head, at least in the vicinity of the ball joint are filled with a dental cement, or other material, capable of being broken up by suitable means, in particular by ultrasonic waves, for a possible dismounting of the head. Particularly appropriate cements are the cements containing zinc phosphate and, generally, all cements which do not "weld" the metal from which the implant is made.
Preferably, the head comprises at one of its ends a spherical part which is so arranged as to be closely cooperative with a complementary contact surface, in the shape of a part of a hollow sphere, carried by said flush end of the insertable member, the spherical part and the surface of contact constit
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Peltier Guy
Peltier Patrick
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