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Timestamp: 2020-05-31 20:19:43
Document Index: 259387147

Matched Legal Cases: ['art 12', 'art 12', 'art 11', 'art 11', 'art 12', 'art 12', 'arts 11', 'art 20', 'art 20', 'art 12']

Dental obturation screw - BORLE; JEAN-PIERRE
Dental obturation screw
United States Patent 4334865
A dental obturation screw is disclosed which comprises a threaded rod and a screw head allowing to actuate the screw and to fasten thereon an articial tooth or tooth part. The screw has a bearing part of convex, axially symmetrical shape which is adapted to rest on a corresponding bearing surface of the part of a natural tooth to be obturated.
Borle, Jean-pierre (Rue Camille-Martin No. 20, 1203 Geneve, CH)
06/202434
BORLE; JEAN-PIERRE
A61C3/02; A61C13/30; (IPC1-7): A61C5/08
433/220, 433/221, 433/174, 433/173, 433/175, 433/180, 433/201
Download PDF 4334865 PDF help
4185383 Dental implant having a biocompatible surface 1980-01-29 Heimke et al. 433/201
3085334 Denture attachment 1963-04-16 Bischof et al. 433/180
2655724 Crown tooth support 1953-10-20 Brooks 433/221
2411758 Tooth root pivot 1946-11-26 Ruetz 433/221
1285785 N/A 1918-11-26 McMahon et al. 433/221
0430522 N/A 1890-06-17 Genese 433/221
DE464497C 1928-08-20 433/220
FR1058354A 1954-03-16 433/220
CUSHMAN, DARBY & CUSHMAN (8TH FLR. 1801 K ST. N. W., WASHINGTON, DC, 20006, US)
1. A dental obturation screw for inserting in the root canal of a natural tooth, said screw having a threaded cylindrical rod and a screw head, said screw head comprising a crown part allowing to actuate the screw and to fasten thereon an artificial tooth part, and comprising a solid uninterrupted bearing part of convex shape symmetrically arranged about the screw axis between said threaded rod and said crown part and having a greatest diameter substantially greater than the diameter of the threaded rod, whereby said bearing part is adapted to rest on a corresponding bearing surface to obturate the root canal of the natural tooth.
The bearing part 12 has preferably the shape of a spherical segment, the greatest diameter of which is substantially greater than the diameter of the threaded rod 11. An annular groove is shown to be formed between the threaded rod 11 and the bearing part 12. The thread is preferably of saw-tooth shape with a top angle of 60° and a small pitch. The screw crown 13 is shown to comprise a milled cylindrical part adapted to allow actuating the screw by means of an appropriate key, for instance a swivelling ball-joint key.
The recess in the natural tooth is preferably formed by means of a diamond reamer such as represented in FIG. 2. The shown reamer comprises a first diamond part 11' which is constituted for instance by two diametrically opposite parts of a cylindrical surface connected to each other by two parallel plane surfaces, the tip of part 11' being formed with an angle of about 120°. A upper cutting part 12' has the shape of a spherical segment corresponding to the part 12 in FIG. 1 comprised between the sections of greatest and of smallest diameter thereof. Both parts 11' and 12' are diamond coated and fixed to a support part 20 adapted to be fitted to an appropriate rotatable tool member not represented in FIG. 2. The support part 20 has a greater diameter than the upper section of part 12' thus forming a protective collar which restricts the drilling depth of the reamer.
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