Source: http://www.google.com/patents/US6276938?dq=5,646,839
Timestamp: 2016-08-25 09:00:24
Document Index: 81722938

Matched Legal Cases: ['art 1', 'art 1', 'art 1', 'art 1', 'arts 1', 'arts 1', 'art 1', 'art 1', 'arts 1', 'art 1']

Patent US6276938 - Method and arrangement for executing a cemented superstructure and also ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA distance member is designed so as to make possible a cemented superstructure in the jaw and can be fastened to the implant in the jaw by means of a screw member. The distance member has a prefabricated external shape which is individually adapted to the respective dental situation in question for the...http://www.google.com/patents/US6276938?utm_source=gb-gplus-sharePatent US6276938 - Method and arrangement for executing a cemented superstructure and also distance member and set of distance membersAdvanced Patent SearchPublication numberUS6276938 B1Publication typeGrantApplication numberUS 09/424,358PCT numberPCT/SE1998/000994Publication dateAug 21, 2001Filing dateMay 27, 1998Priority dateJun 3, 1997Fee statusPaidAlso published asCA2293485A1, CA2293485C, DE69832701D1, DE69832701T2, EP0987994A1, EP0987994B1, WO1998055040A1Publication number09424358, 424358, PCT/1998/994, PCT/SE/1998/000994, PCT/SE/1998/00994, PCT/SE/98/000994, PCT/SE/98/00994, PCT/SE1998/000994, PCT/SE1998/00994, PCT/SE1998000994, PCT/SE199800994, PCT/SE98/000994, PCT/SE98/00994, PCT/SE98000994, PCT/SE9800994, US 6276938 B1, US 6276938B1, US-B1-6276938, US6276938 B1, US6276938B1InventorsLars J�rneus, Bjarne Kvarnstr�mOriginal AssigneeNobel Biocare AbExport CitationBiBTeX, EndNote, RefManPatent Citations (9), Referenced by (22), Classifications (7), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetMethod and arrangement for executing a cemented superstructure and also distance member and set of distance members
US 6276938 B1Abstract
What is claimed is: 1. A method of executing a cemented superstructure wherein an implant is secured to a human jaw by means of a screw member threadably engaged with the implant, mounting a distance member over the implant, and passing the screw member through the distance member and into the implant, characterized in providing a set of distance members which are intended for different individual dental situations, providing each distance member with an internal counterholder, providing a majority of the distance members in the set with individually external different shapes 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 to minimize substantial modification work on the respective anatomical shapes in connection with the construction of the cemented superstructure in the jaw, selecting at least one distance member from the set for the mounting on the implant, mounting the distance member over the implant, inserting a tightening tool into the distance member, engaging the tightening tool with the counterholder and with the screw member, preventing torque from being transmitted from the tightening tool to the implant during the tightening of the screw member as a result of the engagement of the counterholder with the tightening tool, removing the tightening tool after the implant has been tightened, and applying a cemented superstructure around the distance member.
11. The arrangement according to claim 5, characterized in that the lower part is conically shaped upwardly and outwardly at a half cone angle between 20� and 40�.
20. The set according to claim 14, characterized in that the lower part is conically shaped upwardly and outwardly at a half cone angle between 20� and 40�.
24. The distance member according to claim 22, characterized in that the lower part is conically shaped upwardly and outwardly at a half cone angle between 20� and 40′.
26. The distance member according to claim 22, characterized in that the lower part is conically shaped upwardly and outwardly at a half cone angle between 20� and 40�.
FIGS. 1-1c show a first embodiment of a distance member 1. In FIG. 1, dentine is represented symbolically by 2 and soft tissue of the dentine by 3. An implant which has been incorporated into the dentine is designated by 4. The distance member is screwed into the implant by a screw 5 which has an external thread which interacts in a known manner with an internal thread in the implant. The distance member has an upper part 1 a and a lower part 1 b. A lower surface 1 c (FIG. 1a) bears against an upper surface on the implant, likewise in a known manner. The distance member is coned upwardly/outwardly from the lower surface 1 c and the half angle α of the cone is roughly 20�. The length L of the distance member is roughly 11 mm and the length 1 of the lower part 1 b is roughly 1.5 mm. The lower part 1 b is provided with an internal hexagonal recess (FIG. 1b), by means of which the distance member is rotationally fixed relative to the implant which has a hexagonal nut projecting up into the hexagonal recess. The distance member has an internal recess 1 e, in the bottom part of which a counterholder member if is arranged. Via the recess and the counterholder member, a tightening tool 6 for the screw 5 is introduced. The tool may be of a type known per se and include a screwdriver 6 a which can be brought into engagement with a screwdriver recess in the screw in a known manner. By means of the counterholder member, torsional forces are prevented from being transmitted from the tool to the body of the distance member and in this way torsional forces are prevented from being transmitted from the tool to the implant 4. The counterholder member is arranged in a rotationally fixed manner in the recess 1 e, cf. FIG. 1c. It is also characteristic of the distance member 1 that it has a transition 1 g which is made in the form of an upwardly directed (in FIG. 1a) shelf which marks the transition between the upper and lower parts 1 a and 1 b respectively of the distance piece. According to the exemplary embodiment, the upper part is to be covered by a dental bridge or crown, the material of which is indicated by 7 in FIG. 1. The edge of the transition forms a visually noticeable edge which facilitates the work of the dentist and the modelmaker. The diameter D of the transition is roughly 4.5 mm in the case shown. The transition 1 g is also characterized by a sharp external corner which becomes a concave upwardly directed radius R of roughly 1 mm. The upper part is coned upwardly/inwardly and its half cone angle β is roughly 2�.
FIG. 4 shows in longitudinal section a further embodiment of a distance member. In this case, the upper and lower parts 1 a′ and 1 b′ are angled in relation to one another. This means that the length of the lower part (cf. 1 in FIG. 1a) varies around the periphery. In the figure, the centre line of the lower part is indicated by 19 and the centre line of the upper part is indicated by 20. According to the embodiment shown, said centre line is inclined at an angle χ of roughly 20�. The recess 1 e′ has as its centre line the centre line 19 of the lower part and in this way the recess extends obliquely in the inclined upper part 1 a′. FIG. 5 shows a further embodiment where the length L′ and the diameter D′ differ from the corresponding length and diameter in the embodiment described above.
FIG. 7 shows an embodiment with different values for the length L″ and the diameter D′″ and also the half cone angle β′. These values may be selected to be roughly 8 mm, roughly 6 mm and roughly 4� respectively.
In the embodiment according to FIG. 9, the distance member has a transition part 1 h which is essentially cylindrical and is roughly 2 mm long. The angle α′ has in this case been selected to be roughly 40�. The diameter D″″ has been selected to be roughly 7 mm. The length L and the angle β′ apply in this case.
The embodiment according to FIG. 10 shows a variant where the upper and lower parts 1 a′ and 1 b′ respectively have been angled in relation to one another in accordance with the embodiment according to FIG. 4. The angle χ between the centre lines 19 and 20 is selected to be roughly 15� and β′ is selected to be roughly 4�. The angle α 20� is also used in this case. In this case, a length La, representing the length of the upper part, has been selected to be roughly 8 mm.
The embodiment according to FIG. 11 differs from the embodiment according to FIG. 9 in that the values of the angle χ′ and the length La′ have been changed to roughly 25� and roughly 7.75 mm respectively. Moreover, the transition between the upper and lower parts is asymmetrical around the periphery with a greatest straight part 1 h′ on the far left in the figure and a sharp transition 1 g on the far right in the figure. Moreover, a value of roughly 5.8 mm is used for the diameter D′″″.
In FIG. 14, the size of the angle α is roughly 35�. Otherwise, the values L″, diameter D″″ and angle β′ are used, cf. above.
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