Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1997-05-16
1999-09-07
Lewis, Ralph A.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433174, A61C 800
Patent
active
059477334
DESCRIPTION:
BRIEF SUMMARY
FIELD OF APPLICATION OF THE INVENTION
The present invention relates to a connection arrangement for fixing an abutment in an implant which can be fitted in human bones, primarily a dental implant. Opening out at the top of the implant head is a receiving bore which extends axially downwards and which is conically widened towards the top and in which the lower and likewise conical root portion of the abutment sits. For securing the abutment in terms of rotation, a non-rotationally symmetrical receiving contour can be provided in the receiving bore. A coaxial, internally threaded bore extends from the bottom of the receiving bore. To complement the possible receiving contour in the implant, the root portion of the abutment can have a non-rotationally symmetrical outer contour.
Connection arrangements of this type are employed when using a straight or an angled abutment which is secured on the implant by means of a clamping screw, both axially and also against rotation. The clamping screw is introduced into the abutment so that the head of the clamping screw is supported in the abutment, while the threaded shank of the clamping screw protrudes from the abutment at the bottom and engages in the axial internal thread in the implant head. A special screwdriver which can be introduced into the inside of the abutment is provided for tightening and unscrewing the clamping screw, this screwdriver being used especially in the case of angled abutments, but also being suitable for straight abutments. The abutment can be fixed in any desired position of rotation, possible non-rotationally symmetrical contours on the implant and abutment limiting the selectable positions of rotation in accordance with the configuration of the contour of the polygon.
PRIOR ART
In its simplest form, a straight, conical abutment has at the very bottom a threaded plug which is screwed into the internally threaded bore present in the implant. The conical root portion of the abutment then sits in the conical receiving bore, and the head part of the abutment protrudes above the implant shoulder. No separate clamping screw is required here (cf. implantology!, Georg Thieme Verlag, Stuttgart, 2nd ed., 1994, page 122).
When using an angled abutment, the connection with the implant 1 has hitherto been based on providing the abutment with a lateral bore which extends vertically towards the seat of the clamping screw head and through which the screwdriver then has access to the clamping screw. The head of the clamping screw can be introduced via a lateral opening into the seat present in the abutment.
It is true that a connection arrangement of this type can be assembled and screwed together in a relatively practical way by means of the lateral bore and the lateral opening; however, as a result of the two material cutouts adjoining one another, a weak point is created in the wall of the abutment. When the connection arrangement is used at a position in the patient's mouth which is at all times under considerable loading, material fatigue could come about after a period of time and could result in a fracture at this weak point. In addition, the lateral bore has to be sealed off provisionally, in preparation for the impression-taking, and then opened again. This entails additional work.
The aforementioned implants 1 are known per se (cf. SCHROEDER, SUTTER, BUSER, KREKELER, ibid.). Such an implant 1 has at the top the implant head 10 and at the bottom the shaft portion 20, the implant head 10 ending at the very top with the radially encircling implant shoulder 11, and it being possible for an external thread 23 to be present on the shaft portion 20 depending on the implant type. The implant shoulder 11 surrounds the opening of the receiving bore 12 which conically narrows axially downwards, as a result of which the inner cone 14 is created. At the bottom 13 of the bore, the receiving bore 12 merges into a coaxial threaded bore 21 which is of reduced diameter and which extends into the shaft portion 20. The internally threaded bore 21 presents the int
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patent: 5733122 (1998-03-01), Gordon
Grande Vincenzo
Sutter Franz
Tschirky Roger
Institut Straumann AG
Lewis Ralph A.
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