Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/225—Fastening prostheses in the mouth
  • A61C13/30—Fastening of peg-teeth in the mouth
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C2201/00—Material properties
  • A61C2201/002—Material properties using colour effect, e.g. for identification purposes

Definitions

• the present invention relates to a root post with a removable insert which can be used by practitioners for taking an impression in order to produce a dental pivot.
• This anchor comprises at least one rod which is fixed in the corresponding root canal of the tooth, prepared for this purpose.
• the root canal is pierced with a conical or cylindro-conical bore in which the anchor rod is housed.
• the practitioner first takes an impression in the mouth to make the artificial crown and its stem with great precision to subsequently obtain a good introduction and good positioning of the prosthesis.
• a rod is placed with the exact profile of the hole made with a drill or a reamer, to the nearest clearance, extremely small, of the order of a hundredth of a millimeter, for sealing, this rod carrying a head which projects above the roots.
• the practitioner places an impression paste on the teeth of the corresponding maxilla, including on the head drowning it, then the paste is removed with the rod. From this impression, the technician makes the negative impression in order to allow the pivot to be cast, which will therefore have the exact shape of the stem in the lower part, which allows the stem to be sealed in the hole made in the root canal, thus forming a quality anchor.
• the anchor rod remains blocked in the hole and does not come with the paste, when the impression is removed. It is then necessary to remove the rod with pliers and to reposition the rod in the hardened impression, which is delicate.
• the throat is of shallow depth so as to allow withdrawal of the stem of the dough thanks to the elasticity of the latter, theoretically sufficient taking into account the shallow depth of the throat.
• the withdrawal of the rod does not cause any tearing since the groove is hollow and therefore can not hang.
• the paste ring, molded by the groove may have to suffer from shrinkage.
• the present invention provides a removable root post with an insert which is very simple to implement and which is without risk for the practitioner, both dentist and prosthetist, including in the event of repositioning.
• the root post with removable insert for taking an impression, comprises a conical or cylindro-conical body, one end of which is intended to penetrate a bore formed in the root canal of a tooth and the other of which end comprises a point intended to cooperate with the insert, is characterized in that the insert comprises a housing of shape conjugated to that of the point with at least one hard point favoring the correct positioning and ensuring the blocking of the point relative to the insert.
• the insert is external cylindrical and comprises a base of a larger diameter over a small height so as to produce an anchoring flange.
• the insert, its housing and the tip of the body of the post have determined dimensions, only the body of the post being of variable diameter depending on the diameter of the bore produced in the root canal of the tooth.
• the body is of a given color for a given diameter, so as to establish a code, the inserts being of one and the same color since their dimensions do not vary.
• the body of this post and the insert are made of polymer and by molding.
• FIG. 2 a detailed view of the separate post and insert, immediately before assembly
• FIG. 1 a detailed view of the post and the insert, during assembly, with partial section of the insert, and - Figure 4, a detailed view of the post and the insert, once assembled with partial cut.
• the body of the root post is referenced 1 0 and the insert 1 2.
• the post has a known profile, in the case shown cylindrical-conical, designed to cooperate with a bore of conjugate profile, formed in the root part of the tooth.
• the order of magnitude of the diameter D of such a post is 1.5 millimeters. This set does not directly relate to the invention.
• the post is preferably made of plastic from a high precision mold.
• the body of the post comprises a tip 1 4 having a truncated conical part 1 6, inverted, its base 1 8 being directly linked to the body of the tenon.
• the diameter D1 of the large base of the tip is less than or equal to the smallest diameter D of the body of the post.
• the diameter D2 of the truncated end 20, forming the small base, is less than the diameter Ds of a sphere 22 also truncated, integral with this truncated end 20, forming part of the tip.
• the taper of the tip is such that from a height from the truncated end, the diameter D3 of the tip is equal to that of the sphere Ds.
• ⁇ the difference between the diameter Ds of the sphere and the diameter D2 of the truncated end. Still with the aim of fixing orders of magnitude, ⁇ can be considered to be of the order of 5/1 00 of a millimeter. It is noted that the taper was very strongly exaggerated in the drawings to make it possible to appreciate the variations in diameter but the height of the frustoconical part is, in fact, higher so that the angle of taper is very small. Thus the height h is also relatively small.
• the insert 12 comprises a cylindrical base 24 with a diameter greater than or equal to the largest diameter D of the body of the post with a diameter increased at its base 26 over a very small height, in order to produce a rim.
• This insert 12 includes an internal housing 28 with the exact conjugate profile of that of the tip, that is to say of the truncated conical part and of the truncated sphere.
• the clearance has been increased so as to distinguish the outer lines of each of the tip and insert parts.
• the conjugate parts bear the same number increased by 1 00.
• the scope is a circle of diameter D3 equal to Ds.
• the material used is a burn-out polymer with a Shore hardness of 92A.
• the practitioner carries out his bore in a known manner described above then, after having mounted the post body in the insert if this has not already been done, he proceeds to take the impression by having chosen the suitable post body diameter .
• the practitioner can remove it separately and then places the post body back in the insert which is embedded in the paste and necessarily remains in this dough, in particular by the fact that it comprises a base 26 with a rim.
• the practitioner can easily feel the good positioning by the fact that there is a hard point to overcome with self-positioning as soon as the hard point is crossed.
• the immobilization effort of the insert is much greater than that of the effort of inserting or removing the tip 14 from the housing 28 of the insert.
• the insert cannot be degraded by the introduction or the withdrawal of the point of the body of the post because the materials used for the realization of the post as of the insert have sufficient strength and mechanical characteristics without comparison with those of an impression-taking paste It can be seen that the practitioner takes no risk in himself replacing the body of the post because the insert cannot undergo any degradation or deformation of its internal volume 28.
• the body of the body of the post is always greater than that of the base of the frustoconical part of the tip so that when the body is withdrawn, no tearing occurs.
• the post according to the invention has a very important advantage which is that of requiring a single type of insert and tip, only the diameter of the body of the post varying according to the anchoring needs of the prosthesis to be produced. It is therefore necessary to produce different molds only for the manufacture of the bodies whereas only one mold is required for the manufacture of the inserts. This has the other undeniable advantage that there is no possible confusion for the practitioner because he just has to choose his stud body diameter and take an insert.
• a color code is adopted as is practiced in particular for the diameters of dowels and of fixing screws. This allows the practitioner to identify the correct diameter in accordance with the bore in the root canal.
• the body of the post abuts by the difference between the diameter of the body and the diameter of the base of the cylindrical-conical part of the tip, on the top of the insert. This makes it possible to confirm to the practitioner that it is well in abutment.

Landscapes

• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Dentistry (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
• Dental Prosthetics (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9494965

Family Applications (1)

Country Status (4)

Cited By (1)

Family Cites Families (4)

• 1996
  • 1996-08-06 FR FR9610080A patent/FR2752156B1/fr not_active Expired - Lifetime
• 1997
  • 1997-08-05 EP EP97936740A patent/EP0928167A1/de not_active Withdrawn
  • 1997-08-05 AU AU39452/97A patent/AU3945297A/en not_active Abandoned
  • 1997-08-05 WO PCT/FR1997/001453 patent/WO1998005265A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

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