Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
  • A61C8/0018—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the shape
  • A61C8/0022—Self-screwing

Definitions

• TITLE Implant with Enlarged Proximal Segment.
• the present invention relates to an improvement in dental implants including, without limitation, dental implants of the type taught in U.S. Patent No. 5,964,766 (1999) entitled Buttress Thread Implant.
• a historic concern in the technology of dental implantation has been that of maximizing securement, more technically known as bio-integration, of the dental implant within the cortical bone of the maxilla or mandible of the dental patient.
• Many structures and methods have been suggested to achieve this end, the same including, without limitation, buttress thread implants of the type referenced above.
• the present invention therefore relates to a novel structure for a dental implant, the design for use with a specific method for the provision of enhanced bone-to-implant securement.
• the instant invention responds to a long-felt in the art of implant dentistry.
• a dental implant for securement within a bore within a maxilla or mandible, inclusive of the cortical bone thereof includes a threaded elongate anchor having a proximal upper portion having a larger outside diameter than that of an integral distal lower portion thereof, said anchor defining, in axial cross-section, an envelope in which said upper portion substantially defines a cylinder and said lower portion substantially defines a conical section, and an engagable head integrally dependent from a proximal surface of said proximal portion of said anchor, said head having an outside diameter smaller than a greatest outside diameter of said proximal portion of said anchor, said outside diameter of said head also equal or less than a diameter of an entry region into said bore.
• a greatest axial length of said lower portion comprises a length of about 6.0 mm.
• Fig. 1 is an elevational view showing the surface of a dental implant in accordance with the present invention.
• Figs. 1A and 1 B are views showing variations in the D1 and D2 dimension of the upper cylindrical portion of the anchor of the present implant.
• Fig. 2 is a top plan view of the implant of Fig. 1.
• Fig. 3 is a vertical schematic view through the axis of rotation of a bone bore formed in accordance with the inventive method.
• Fig. 4 is a schematic view, sequential to the view of Fig. 3, showing initial insertion of the implant into the bone bore.
• Fig. 5 is a schematic view, further sequential to the view of Fig. 4, showing a substantially complete insertion of the implant into the bone bore.
• Fig. 6 is a sciematic view, sequential to the view of Fig. 5, showing completion of the insertion of the implant into the bone bore.
• a dental implant 10 may be seen to include a rigid anchor 12 preferably including threading upon lateral surfaces thereof.
• threading may include, without limitation, buttress threading and machine screw threading.
• Said anchor includes proximal and distal portions 14 and 16 respectively wherein the greatest outside diameter of the proximal segment is greater than the greatest outside diameter of the distal segment.
• thermal axial length of the proximal segment is about one-third of the total length of the implant.
• the dental implant further includes an engagable head 18 which is integrally dependent from a proximal surface 20 of said proximal portion 14 of the implant anchor 12. It is noted that the outside diameter of said head 18 is smaller than the greatest outside diameter of said proximal portion 14 as, more particularly, may be noted with reference to the top axial plan view of Fig. 2.
• the outside diameter of said head 18 is between about 0.25 to 0.60 millimeters smaller than the greatest outside diameter of said proximal segment 14 of the anchor 12. It is further noted that head 18 includes an engagable grippable portion 22, typically configured for engagement by a hex- head torque wrench.
• the head and anchor include an axial longitudinal bore 24 within which an elongate element of an abutment, or a screw-anchoring abutment ultimately to be secured within implant 10, is placed.
• said cylindrical proximal portion 14 of the implant anchor 12 may be provided in a range of axial lengths as is indicated by the dimensions D1 , corresponding to proximal portion14a, in Fig. 1A, and dimension D2 in Fig. 1 B corresponding to proximal portion 14b therein.
• the range of dimension D will typically fall between 2 and 9 millimeters, whereas the length A of distal conical segment 16 will always be that of approximately 6 millimeters, with a possible range of 4.8 to 7.2 millimeters.
• an axial length of about 6 millimeters of said conical distal portion 16 is most ergonomic and has been found, in combination with the particular shape of the conical distal portion16 and geometry of bore 26 (which is complemental to that of segment 16) optimizes biointegration of anchor 12 within the osseotomy site. See Figs 3 and 6.
• Other important dimensions of distal portion 16 are that of dimension C which is that of the diameter of the anchor at a transition plane 15 at which proximal portion 14 begins to taper into distal portion 16. This dimension has been found to optimally fall within a range of 4 to 7 millimeters, while dimension A (as above noted) remains fixed at approximately 6 millimeters.
• Dimension B that is, a flat planar distal-most surface of distal segment 16 will typically fall in a range of 1 to 3 millimeters.
• a bore 26 which has been drilled within a cortical bone 32 of a maxilla or mandible of a patient for placement of an implant.
• soft tissue of gum 30 Above the cortical bone is shown soft tissue of gum 30.
• an entry region 28 Within bore 26 is an entry region 28 which may exhibit a diameter typically greater than a distal region of said bore, however, of a diameter generally equal to the outside diameter of said implant head 18, as is more fully described below.
• FIG. 4 there is shown a rotational entry of the implant 10 into bone bore 26 at the area of transition between the distal portion 16 and proximal portion 14 of the implant anchor 12.
• bone 32 is compressed radially outwardly as is depicted by arrows 34 in Fig. 4.
• cortical bone 32 is forced radially outwardly to accommodate the greater outside diameter of proximal implant portion 14.
• proximal segment 14 will cut into bone 32 as the segment is advanced into bone 26.
• FIG. 6 This bone-to-implant engagement process is further shown in Fig. 6 in which, as may be noted, head 18 of the implant 10 has been advanced within bore 26, beneath the gum line 30 such that the head 18 is press-fittably engaged by the soft tissue of the gum. Accordingly, as is depicted, after completion of the method of the present invention, proximal segment 14 of the implant is compressible engaged by bone 32, as is head 18 by soft tissue 30. As such, an improved bone-to-implant securement, with improved osseointegration of the implant to the bone, is effected.
• the anchor is provided with a buttress threading
• such threading is axially symmetric and exhibits (1) radially circumferential spiral pitch surfaces, in a range of about 22 to about 28 pitch surfaces per axial inch, (2) an upper concave bevel surface above each pitch surface, which is longer than a lower bevel surface beneath each pitch surface, and (3) an intersection of each plane of each pitch surface with each plane of each lower bevel surface defining a total included angle in a range of about 90 to about 130 degrees
• said anchor having minor thread diameters at intersections, between pitch surfaces, of said upper and lower bevel surfaces, said pitch surfaces and said minor thread diameters defining, at any axial radius of said rigid body, a ratio of thread pitch to thread depth in a range of about 1.25:1 to about 1.40:1.
• Each of said lower bevel surfaces define a total included angle in a range of about 20 to about 30 degrees relative to any given axial radius of said implant at a minor thread diameter thereof.

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• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Orthopedic Medicine & 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)
• Prostheses (AREA)
• Dental Prosthetics (AREA)

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Citations (6)

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• 2000
  • 2000-12-29 AU AU39674/01A patent/AU3967401A/en not_active Abandoned
  • 2000-12-29 EP EP00992218A patent/EP1259187A4/de not_active Withdrawn
  • 2000-12-29 WO PCT/US2000/035511 patent/WO2001049200A2/en active Application Filing

Patent Citations (6)

Non-Patent Citations (1)

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