WO2011132007A2 - Implant dentaire, ancrage dentaire et kit dentaire - Google Patents

Implant dentaire, ancrage dentaire et kit dentaire Download PDF

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Publication number
WO2011132007A2
WO2011132007A2 PCT/HU2011/000036 HU2011000036W WO2011132007A2 WO 2011132007 A2 WO2011132007 A2 WO 2011132007A2 HU 2011000036 W HU2011000036 W HU 2011000036W WO 2011132007 A2 WO2011132007 A2 WO 2011132007A2
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WO
WIPO (PCT)
Prior art keywords
implant
abutment
proximal
centring
cross
Prior art date
Application number
PCT/HU2011/000036
Other languages
English (en)
Other versions
WO2011132007A3 (fr
Inventor
Zoltán SZAKACS
Marius Steigmann
Original Assignee
Tri Dental Implants Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tri Dental Implants Ag filed Critical Tri Dental Implants Ag
Publication of WO2011132007A2 publication Critical patent/WO2011132007A2/fr
Publication of WO2011132007A3 publication Critical patent/WO2011132007A3/fr

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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
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • 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
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0066—Connecting devices for joining an upper structure with an implant member, e.g. spacers with positioning means
    • 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
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0054—Connecting devices for joining an upper structure with an implant member, e.g. spacers having a cylindrical implant connecting part
    • 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
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0059—Connecting devices for joining an upper structure with an implant member, e.g. spacers with additional friction enhancing means
    • 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
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0068—Connecting devices for joining an upper structure with an implant member, e.g. spacers with an additional screw
    • 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
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0069—Connecting devices for joining an upper structure with an implant member, e.g. spacers tapered or conical connection
    • A61C8/0071—Connecting devices for joining an upper structure with an implant member, e.g. spacers tapered or conical connection with a self-locking taper, e.g. morse taper

Definitions

  • the present invention relates to a dental implant, a dental abutment and a dental kit comprising a matching implant and abutment.
  • Endosseous dental implants are designed to be implanted directly into the bone during a surgical procedure. First the implantation site is exposed then a hole is drilled into the bone. The implant and a driver mount connected thereto are moved to the implantation site and the distal end of the implant is driven into the bore.
  • the implant is generally provided with self-tapping threads on its external surface, hence as the implant is rotated, it simultaneously taps threads in the bone and is thereby screwed into these threads.
  • a typical self-tapping implant has a distal end which taps the threads into the bone and a proximal end for connection with an abutment designed to support a dental prosthesis.
  • the distal end generally comprises one or more flutes or grooves provided with a cutting edge.
  • the distal end may be provided with a longitudinal apical hole and a transversal through-hole allowing the growth of the anchoring bone through the openings in the course of healing and osseointegration.
  • the implant body generally comprises an internally threaded passage which is designed to cooperate with a threaded shaft of a healing screw that is to be inserted into the implant for the period required for healing and osseointegration to take place on the outside of the implant. Once the healing takes place the healing screw is removed and an abutment designed to support a dental prosthesis is inserted into the proximal end of the implant.
  • a proximal wrench-engaging surface At the proximal end many prior art implant bodies include a proximal wrench-engaging surface in order to provide anti-rotational stability to the abutment.
  • the wrench engaging surface is generally in the form of an internal or external hex or in the form of grooves designed to cooperate with corresponding hex-shaped surface or corresponding projections, respectively, provided on an engaging region of the abutment.
  • EP 0 851 744 discloses an implant body having wrench engaging surface in the form of a positive connection area comprising grooves and an abutment provided with a corresponding positive connection portion comprising projections.
  • the positive connection area within the internal passage of the implant is followed by a cylindrical guidance area and an internally threaded annular centring portion designed to accommodate corresponding guidance portion and cylindrical centring sleeve of the abutment.
  • One of the drawbacks of the prior art structure is that the positive connection area offering anti-rotational stability is very small due to the need of the cylindrical guidance area.
  • the short projections are also very prone to snapping as substantial torque load and shearing forces are exerted on the projections when the abutment is used to insert the implant. For the latter reason the prior art abutment is not well suited to serve as an insertion tool for inserting the implant, although multifunctional abutments are very convenient to use.
  • a dental implant having an axial internal passage extending from a proximal end of the implant and terminating inside the implant, the internal passage comprises
  • the anti-rotational engagement portion of the implant is provided with at least one longitudinal groove extending axially substantially from the proximal end of the implant to the centring portion of the internal passage.
  • the anti-rotational engagement portion is provided with two to six longitudinal grooves, preferably three longitudinal grooves.
  • the centring portion has cylindrical or tapered walls of substantially smooth surface, thereby allowing for tight fitting along the whole of the centring portion between the implant and a corresponding smooth centring portion of an abutment according to the invention.
  • the invention further relates to dental abutment for engagement with a dental implant, the abutment comprising a proximal upper portion,
  • the anti-rotational engagement portion of the abutment is provided with at least one longitudinal projection extending axially substantially to the centring portion of the abutment.
  • the anti-rotational engagement portion is provided with two to six longitudinal projections, preferably three longitudinal projections.
  • the abutment is suitable for friction fitting into a corresponding dental implant.
  • at least one longitudinal projection is distally tapered at an angle of less than 2 degrees, preferably by about 1 degree.
  • the centring portion has cylindrical or tapered walls of substantially smooth surface which is provided with excess material in order to cause friction fitting when inserted into a cylindrical or tapered passage of corresponding size of a dental implant.
  • the excess material is preferably located substantially adjacent to the at least one longitudinal projection.
  • the invention further relates to a dental kit comprising a dental implant and a dental abutment.
  • the dental implant has an axial internal passage extending from a proximal end of the implant and terminating inside the implant, the internal passage comprising:
  • distal portion the proximal cross-section of which is smaller than the distal cross-section of the centring portion, the distal portion being at least partly threaded
  • the abutment comprises:
  • centring portion the proximal cross-section of which is smaller than the distal cross-section of the engagement portion, and the cross-sectional dimensions of which correspond to the cross- sectional-dimensions of the centring portion of the internal passage of the implant
  • the anti-rotational engagement portion of the implant is provided with at least one longitudinal groove extending substantially from the proximal end of the implant to the centring portion of the internal passage, and
  • the anti-rotational engagement portion of the abutment is provided with corresponding number of longitudinal projection extending substantially to the centring portion of the abutment and the longitudinal projections are located so as to engage the longitudinal grooves when the abutment is inserted into the internal passage of the implant.
  • Preferred embodiments of the dental implant, dental abutment and dental kit are defined in the attached dependent claims.
  • Fig. 1 is a perspective side view of an advantageous embodiment of a dental implant according to the invention.
  • Fig. 2 is a sectional view of the implant according to Fig. 1 taken along line A-A.
  • Fig. 3 is a top plan view of the implant according to Fig. 1.
  • Fig. 4 is a cross sectional profile of the embodiment of the implant according to Fig. 1.
  • Fig. 5 is the enlarged view of section A of Fig. 4.
  • Fig. 6 is the enlarged view of section B of Fig. 4.
  • Fig. 7 is the enlarged view of section C of Fig. 4.
  • Fig. 8 is perspective side view of an advantageous embodiment of an abutment fitting into the implant according to Fig. 1.
  • Fig. 9 is a sectional view of the abutment according to Fig. 8 taken along line A-A.
  • Fig. 10 is a bottom plan view of the abutment according to Fig. 8.
  • Figures 1 to 7 illustrate a first preferred embodiment of a dental implant
  • the implant 10 has an externally threaded body 12, wherein an internal passage 30 is provided as can be seen in the sectional view of Fig. 2.
  • the internal passage 30 is designed to receive and cooperate with corresponding engagement means of various objects such as a driver mount, a healing screw and an abutment for a dental prosthesis, of which only the latter will be described in more detail.
  • the internal passage 30 of the implant 10 comprises three neighbouring portions: an anti-rotational engagement portion 32, a centring portion 90 and a distal portion 34.
  • the anti-rotational engagement portion 32 is provided with at least one longitudinal groove 33 (three longitudinal grooves 33 in the present embodiment) formed in the internal wall 35 of the passage 30 and designed to cooperate with corresponding longitudinal projections of e.g. a dental abutment for a prosthesis.
  • the longitudinal grooves 33 are formed axially, i.e. parallel to the axis of the implant.
  • the longitudinal grooves 33 extend substantially from the proximal end 11 of the implant 10 to the centring portion 90 of the internal passage 30. Due to the process of fabrication a minimal space is generally left between the distal end 33b of the longitudinal grooves 33 and the distal end 32b of the engagement portion 32.
  • the longitudinal grooves 33 extending substantially along the whole length of the engagement portion 32 are adequate for achieving the benefits of the invention, i.e. increased anti-rotational stability.
  • a first tapered portion 95 is provided between the engagement portion 32 and the centring portion 90 in order to help the insertion of a centring portion of an abutment into the centring portion 90 by guiding the end of the abutment via the first tapered portion 95.
  • the tapering angle is preferably 45 degrees in order to facilitate fabrication, however, other tapering angles may be used as well.
  • the centring portion may have a cylindrical wall 91 as indicated in the Figures or distally tapered wall (i.e. the centring portion 90 becomes smaller in the distal direction) although the cylindrical wall allows for easier fabrication.
  • the proximal cross-section 90a of the centring portion 90 is smaller than the distal cross-section 32b of the engagement portion 32. If the centring portion 90 has a cylindrical wall this means that the diameter of the centring portion 90 is smaller than the diameter of the engagement portion 32.
  • the wall 91 of the central portion 90 preferably has a substantially smooth surface thus providing tight fitting along its whole surface when an abutment with corresponding dimensions is inserted into the internal passage 30 of the implant 10.
  • the distal portion 34 has a proximal cross-section 34a which is smaller than the distal cross-section 90b of the centring portion 90.
  • the distal portion 34 is at least partly threaded internally in order to engage a threaded shaft of a healing screw or a screw affixing an abutment to the implant 10.
  • a second tapered portion 97 is provided between the centring portion 90 and the distal portion 34 in order to help the insertion of a threaded shaft of a healing screw or fixing screw into the distal portion 34 by guiding the end of the screw via the second tapered portion 97.
  • the implant 10 has an externally threaded body 12 comprising a middle portion 14 of height H1 adjoining a distal end portion 16 of height H2 and a proximal neck portion 18 of height H3.
  • one or more flutes 22 with cutting edges 24 are provided at the distal end portion 16 of the implant body 12 in order to facilitate tapping into the bone at the implantation site.
  • a through-hole 20 and/or an apical hole may be provided below the distal portion 34 of the internal passage 30 if the full height H of the implant 10 is sufficiently greater than the full length of the inner passage 30. In this case the through-hole 20 terminates in the flute 22.
  • the external surface of the prior art implants are either provided with threads of greater height and having a narrow angle of thread (i.e. the angle between two adjacent flanks measured at the cross-section of screw threads - including the axis of the screw thread), typically an angle of thread of 45 degrees, or the external surface is provided with less high threads having a wider angle of thread, typically an angle of thread of 60 degrees.
  • threads 50 of different profiles are formed on the external surface of the implant body 12.
  • the first threads 50a of the middle portion 14 of the externally threaded body 12 are substantially of a first height hi (indicated in the enlarged view of Fig. 5) and have a first angle of thread a1.
  • the second threads 50b of the distal end portion 16 are of a varying second height h2 greater than the first height hi and increasing in the direction of the distal end 16a.
  • the second threads 50b have a second angle of thread a2 being preferably smaller than the first angle of thread a1.
  • the distal end portion 16 is of a conical design having a tapered wall 16w as illustrated in Figures 2 i
  • the enveloping surface 16e is defined by the crests of the threads 50b.
  • the tapered wall 16w of the conical distal end portion 16 defined by the bottom of the thread grooves is preferably tapered at an angle of at least 1 degree, more preferably at an angle of at least 2 degrees and preferably not more than by about 10 degrees.
  • the implant 10 according to the invention has for benefit that sharper and deeper second external threads 50b are applied at the distal end portion 16 where bite and self-tapping properties are of utmost importance, while the middle portion 14 is provided with the less deep external threads 50a in order to maintain the required wall thickness. Moreover, since the greater second external threads 50b terminate in the smaller first external threads 50a the bone chips cut by the self-tapping first external threads 50b are compacted between the crests 50 of the first external threads 50a.
  • the proximal neck portion 18 of the implant body 12 is provided with threads 50c substantially along its full length.
  • the threads 50c are of a third height h3 being smaller than the first height hi .
  • the threads 50c of the neck portion 18 have a third angle of thread a3 being substantially the same as the first angle of thread a1 in order to simplify the production of the implant 10.
  • the threaded neck portion 18 provides for better osseointegration as compared to the unthreaded neck portions of the prior art. According to medical studies it has been shown that where no osseointegration occurs bone resorption will take place over a number of years, sometimes over as little as one or two years.
  • the neck portion 18 of the implant 10 according to the invention is preferably provided with threads 50c.
  • a further advantage of the threads 50c is that it helps distribute the load in the harder corticalis which also contributes to prohibiting bone resorption.
  • the first and the third angle of thread a1 and a3 are preferably between
  • the second angle of thread a2 is between 35 to 55 degrees, preferably between 40 to 50 degrees, more preferably about 45 degrees.
  • the height hi , h2, h3 of the threads 50 is preferably as follows.
  • the first height hi of the first type of thread 50a provided on the middle portion 14 is preferably between 0.3 to 0.4 mm, most preferably about 0.35 mm. It is also conceivable that the first height hi of the first threads 50a varies within the preferred interval such that the first height hi of the first threads 50a increases from the proximal end of the middle portion 14 towards the distal end of the middle portion 14, i.e. from the direction of the proximal neck portion 18 in the direction of the distal end portion 16 of the implant body 12.
  • the second type of thread 50b provided on the distal end portion 16 of the implant body 12 are of an increasing height, which is preferably between 0.4 to 0.55 mm, most preferably about 0.45 to 0.5 mm.
  • the second height h2 of the second threads 50b varies within the preferred interval such that the second height h2 of the second threads 50a increases from the middle portion 14 of the implant 10 towards the distal end 16a of the implant 10 whereby the enveloping surface 16c of the crests of the second threads 52b is a cylindrical surface.
  • the third height h3 of the third type of thread 50c provided on the proximal neck portion 18 of the implant body 12 is preferably between 0.15 to 0.25 mm, most preferably about 0.2 mm. It is also conceivable that the third height h3 of the third threads 50c varies within the preferred interval such that the third height h3 of the third threads 50c decreases from the middle portion 14 of the implant 10 towards the proximal end 18a of the implant 10.
  • external threading of the implant body 12 comprises at least two threads 50 with separate leads. More preferably triple threads 50 are provided, which run substantially along the entire body 12 of the implant 10. The multiple threads further enhance the tapping capacity and bite of the self-tapping implant 10.
  • the height H1 of the middle portion 14 is determined by the required full height H of the dental implant 10.
  • the opening left behind the root is of a diameter of about 5 mm, while the common implant-diameter is about 3.5 to 4.7 mm.
  • prior art research has found that it is sufficient to screw a relatively short portion of the implant into the bone at the distal end of the opening left by the extracted tooth root.
  • the state of the art recommends driving the implant 10 into the bone at a depth of about 2 to 3 mm.
  • the height H2 of the distal end portion 16 having the deeper and sharper second threads 50b designed for tapping the bone and having an ameliorated bite preferably corresponds to the required insertion length into the bone, thus the height H2 of the distal end portion 16 is preferably about 2 to 3 mm, more preferably about 2.5 mm.
  • the height H3 of the proximal neck portion 18 of the implant body 12 is determined by the length of the anti-rotational engagement portion 32 within the internal passage 30 of the implant 10. Higher threads are more advantageous from the point of view of fastening the implant, however the height of the threads 50c provided on the external wall of the implant 10 surrounding the anti- rotational engagement portion 32 is limited by the required minimum wall thickness.
  • the anti-rotational engagement portion 32 preferably has a greater diameter than the rest of the internal passage 30 in order to allow for exercising sufficient torque via the driver mount when it is coupled with the anti-rotational engagement portion 32, while at the same time the wall surrounding the engagement portion 32 must be of sufficient thickness to resist any deformation of the implant body 12 when said torque is exercised.
  • the proximal neck portion 18 comprising smaller threads 50c preferably corresponds to the portion of the implant body 12 surrounding the anti-rotational engagement portion 32, its height H3 is therefore preferably only little more than the typical length of an anti-rotation engagement portion 32, i.e. about 2 to 3 mm, preferably about 2.5 mm.
  • the external threads 50c are preferably provided along at least half of the height of the neck portion 18, more preferably the threads 50c are provided along at least two thirds of the height H3 of the neck portion 18.
  • the implant 10 is preferably made of TAV, i.e. Ti-6AI-4V type titanium, which is at least 10% stronger than the . Grade 4 type titanium commonly used in the state of the art implant products.
  • TAV i.e. Ti-6AI-4V type titanium
  • Grade 4 type titanium commonly used in the state of the art implant products.
  • the increased strength of the applied material makes it possible to form the sharp exterior threads 50b of ameliorated self-tapping properties.
  • FIGS 8 to 11 show a preferred embodiment of a dental abutment 100 according to the invention.
  • the abutment 100 comprises a body 110 having a multifunctional upper portion 112 and a retention portion 114 to be inserted into the internal passage 30 of the implant 10 according to the invention.
  • An axial passage 116 is provided within the body 110, which extends between a proximal end 110a and a distal end 110b of the body 110.
  • the passage 116 preferably comprises a threaded portion 118 for affixing the abutment 100 to the implant 10 when the retention portion 114 of the abutment 100 is inserted into the internal passage 30 of the implant 10.
  • a screw may be inserted through the proximal end 116a of the passage 116 and threaded into the threaded portion 118 of the passage 116 of the abutment 100 as well as the threaded distal portion 34 of the internal passage 30 of the implant 10, thereby affixing the abutment 100 to the implant 10.
  • the threaded portion 118 within the abutment 100 also serves to retain a fixing screw while the abutment 100 is mounted on the implant 10, after which the retained fixing screw can be simply screwed further inside to engage the threaded portion of the distal portion 34 of the internal passage 30.
  • the retention portion 114 of the abutment comprises a proximal ant- rotational engagement portion 132 and a distal centring portion 190.
  • the anti-rotational engagement portion 132 of the abutment is provided with at least one longitudinal projection 133 extending axially substantially all the way down to the proximal end 190a of the centring portion 190 of the abutment 190.
  • the longitudinal projection 133 according to the invention is substantially longer than the prior art embodiments thereby increasing the anti- rotational stability on the one hand, and rendering the longitudinal projection 133 more resistant to torque load and shearing forces.
  • the number of the longitudinal projections 133 as well as their location corresponds to the number and location of the longitudinal grooves 33 of the anti-rotational engagement portion 32 of the implant 10 so as to engage the longitudinal grooves 33 when the retention portion 114 of the abutment 100 is inserted into the internal passage 30 of the implant 10.
  • At least one longitudinal projection 133 is required for ensuring anti-rotational stability, however a single projection 133 would need to withstand very high torque load, hence from the point of view of load distribution it is better to apply more than one projections 133 which are preferably evenly distributed along the circumference of the engagement portion 132.
  • the longitudinal projections 133 of the engagement portion 132 of the abutment 100 require corresponding longitudinal grooves 33 within the wall of the engagement portion 32 of the implant 10, this, however, weakens the wall strength.
  • the problem is partly eliminated by providing threads 50c of smaller height h3 on the proximal neck portion 18 of the implant 10, however the inventors have found that the number of the applied longitudinal grooves 33 and projections 133 is preferably not more than six, the upper limit being suited mostly in the case of larger implants 10 having a coronal diameter of typically 4.1 mm or 4.7 mm.
  • Three longitudinal grooves 33 and projections 133 have been found particularly advantageous both from the point of view of wall strength of the proximal neck portion 18 of the implant and from the point of view of load distribution among the projections 133 of the engagement portion 132 of the abutment 100.
  • the dimensions (diameter and length) of the anti-rotational engagement portion 132 of the abutment 100 correspond to the dimensions of the anti- rotational engagement portion 32 of the internal passage 30 of the implant 10. ln the context of the present invention corresponding dimensions signify dimensions allowing the anti-rotational engagement portion 132 of the abutment 100 to be fitted into the anti-rotation engagement portion 32 of the internal passage 30 of the implant 10. Tight fit is desirable between the retention portion 114 of the abutment 100 and the internal passage 30 of the implant, hence it is possible to form parts of the anti-rotational engagement portion 132 of the abutment 100 with slightly greater cross-section than that of the corresponding parts of the anti-rotational engagement portion 32 of the implant 10.
  • the longitudinal projections 133 of the abutment 100 may be distally tapered at angle of less than 2 degrees, preferably by about 1 degree, thus defining a slightly greater cross-sectional diameter at the proximal end 132a of the engagement portion 132 of the abutment 100 than the diameter of the corresponding cross-section of the engagement portion 32 of the implant 10.
  • the longitudinal grooves 33 of the engagement portion 32 of the implant 10 may be distally tapered too, having for effect that the longitudinal projections 133 ban be friction fit into the longitudinal grooves 33.
  • Another preferred way of providing for friction fitting is leaving excess material on the outer wall of the centring portion 190 of the abutment 100 as will be explained later on.
  • the cross-sectional dimensions of the centring portion 190 of the abutment 100 correspond to the cross-sectional dimensions of the centring portion 90 of the internal passage 30 of the implant 10. This means that in case the centring portion 90 of the implant 10 is of a cylindrical form then the centring portion 190 of the abutment 100 is of a cylindrical structure too, the outer diameter of the centring portion 190 of the abutment 100 matching the inner diameter of the centring portion 90 of the implant 10. If the centring portion 90 of the implant 10 is of a tapered form, then the centring portion 190 of the abutment 100 is tapered too at substantially the same taper angle in order to fit into the centring portion 90 of the implant.
  • the proximal cross-section 190a of the centring portion 190 is smaller than the distal cross- section 132b of the engagement portion 132 of the abutment.
  • the length of the centring portion 190 of the abutment 100 is not greater than the length of the centring portion 90 of the implant 10 in order to allow insertion of the retention portion 114 of the abutment 100 into the internal passage 30 of the implant, however, preferably not only the cross-sectional diameters of the two centring portions 90 and 190 are matching but also the length of the centring portion 190 of the abutment 100 and the length of the centring portion 90 of the implant 10.
  • the cylindrical or tapered wall 91 and 191 of the centring portion 90 and 190 of the implant 10 and of the abutment 100 respectively are both substantially smooth, hence the two surfaces provide for tight fitting between the implant 10 and the abutment. Because of the tight fitting in the centring region the stability of the connection is significantly increased over the prior art connections.
  • the fitting between the centring portion 190 of the abutment 100 and the centring portion 90 of the implant 10 is preferably friction fitting.
  • Friction fitting eliminates micro movements of the two central portions 90 and 190 with respect to each other, which is very important for building a durable dental prosthesis. In a preferred embodiment this is achieved by providing on the substantially smooth cylindrical or tapered wall surface of the centring portion 190 of the abutment 100 excess material 193 in order to cause friction fitting when inserted into the corresponding cylindrical or tapered centring portion 90 of the internal passage 30 of the implant 10.
  • the excess material 193 is located substantially adjacent
  • the abutment 100 is preferably made of the same material as the implant 10, preferably of TAV, i.e. Ti-6AI-4V type titanium, which allows for lathe machining.
  • the excess material 193 may be present in the form of a longitudinally extending rectangular prism of a length of about 0.5 to 1.5 mm, having the same width as that of the longitudinal projections 33 (which may be about 0.1 to 0.3 mm) and having a height of about 0.1 to 0.2 mm. Other shapes and sizes are also possible.
  • Providing friction fitting between the two centring portions 90 and 190 may be the only option in case of smaller implants 10 that do not allow for tapered longitudinal projections 133 as the imposed stress would weaken the relatively thin wall of the proximal neck portion 18 of the implant 10 making it prone to breaking.
  • the proximal upper portion 112 is preferably separated from the retention portion 114 by a shoulder 113, which abuts the dental implant 10 when the retention portion 114 is inserted into the internal passage 30 of the implant 10.
  • the cross-section of the proximal upper portion 112 increases substantially monotonically from the shoulder 113 over a neck portion 115 of the upper portion 112 of the abutment.
  • Prior art neck portions are provided with a substantial curvature as it is believed to help integration with the gum tissue.
  • platform switching is provided for between the proximal end 11 of the implant 10 the shoulder 113 of the upper portion 112.
  • the abutment 100 is preferably a multi-functional tool serving as an insertion tool in the course of inserting the implant 10, serving as a positional and spatial transfer tool when used in a casting process and finally serving to support a dental prosthesis.
  • the anti-rotational engagement portion 132 with longitudinal projections 133 of a substantial length render the abutment 100 suitable for anti-rotational engagement with the implant 10 and for screwing the implant 10 into the insertion site.
  • friction fitting is preferably dispensed with. ln order to serve as a positional and spatial transfer tool the abutment 100 is provided with a flattened, longitudinally extending external sidewall surface 180, which allows for positional and spatial transfer when used in a casting process.
  • a dental kit comprising the dental implant 10 and the dental abutment
  • the implantation site is prepared, which may comprise extracting a tooth and drilling an artificial bore into the opening left by the extracted tooth root.
  • the self-tapping implant 10 is then positioned at the implantation site and is drilled into the bone at the distal end of the opening or optionally of the artificial bore at a depth of about 2 to 2.5 mm via the multifunctional abutment 100 serving as a driver mount attached to the anti-rotational engagement portion 32 of the implant body 12.
  • the driver mount is then removed and a healing screw is screwed into the internal passage 30 of the implant body 12 such as to engage the internal threaded bore therein.
  • the implant 10 remains within the bone allowing for healing and osseointegration to take place.
  • the healing screw is removed during a second surgical procedure when the implant 10 is re-exposed and the abutment 100 for a dental prosthesis is adjoined to the internal passage 30 of the implant body 12 by inserting the retention portion 114 of the abutment 30 within the internal passage 30 of the implant 10 such that the longitudinal projections 133 of the anti-rotational engagement portion 132 of the abutment 100 engage the grooves 33 of the anti-rotational engagement portion 132 of the implant 10.
  • the abutment 100 is affixed to the implant 10 via a fixing screw which is screwed into the threaded portion 118 of the axial passage 112 of the abutment 100 and into the threaded portion of the distal portion 34 of the internal passage 30 of the implant.

Abstract

L'invention concerne un implant dentaire ayant un passage interne axial s'étendant depuis une extrémité proximale de l'implant et terminant à l'intérieur de l'implant, le passage interne comprend une partie d'engagement proximale anti-rotation, une partie de centrage dont la section transversale proximale est plus petite que la section transversale distale de la partie d'engagement, et une partie distale dont la section transversale proximale est plus petite que la section transversale distale de la partie de centrage, la partie distale étant au moins partiellement filetée. La partie d'engagement anti-rotation de l'implant est pourvue d'au moins une rainure longitudinale s'étendant de façon sensiblement axiale de l'extrémité proximale de l'implant à la partie de centrage du passage interne. L'invention concerne en outre un ancrage dentaire pour engagement avec un implant dentaire, l'ancrage comprenant une partie supérieure proximale, une partie d'engagement proximale anti-rotation, une partie de centrage dont la section transversale proximale est plus petite que la section transversale distale de la partie d'engagement. La partie d'engagement anti-rotation de l'ancrage est pourvue d'au moins une saillie longitudinale s'étendant de façon sensiblement axiale par rapport à la partie de centrage de l'ancrage. L'invention concerne en outre un kit dentaire comprenant un tel implant dentaire et un ancrage dentaire correspondant.
PCT/HU2011/000036 2010-04-20 2011-04-20 Implant dentaire, ancrage dentaire et kit dentaire WO2011132007A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU1000219A HUP1000219A2 (en) 2010-04-20 2010-04-20 Dental implant, dental abutment and dental kit
HUP1000219 2010-04-20

Publications (2)

Publication Number Publication Date
WO2011132007A2 true WO2011132007A2 (fr) 2011-10-27
WO2011132007A3 WO2011132007A3 (fr) 2012-02-02

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HU (1) HUP1000219A2 (fr)
WO (1) WO2011132007A2 (fr)

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US9468506B2 (en) 2011-12-30 2016-10-18 Nobel Biocare Services Ag Abutment position locator
US9681930B2 (en) 2014-12-15 2017-06-20 Jjgc Industria E Comercio De Materiais Dentarious S/A Implants for enhanced anchoring within bone
WO2017137588A1 (fr) * 2016-02-10 2017-08-17 Nobel Biocare Services Ag Fixation dentaire pouvant être fixée à un composant dentaire et ensemble dentaire comprenant la fixation dentaire et le composant dentaire
USD816841S1 (en) 2014-12-15 2018-05-01 Jjgc Industria E Comercio De Materiais Dentarios S/A Bone implant
US10898301B2 (en) 2016-05-05 2021-01-26 Jjgc Industria E Comercio De Materiais Dentarios S.A. Prosthetic assembly and method for producing the same

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EP0851744A1 (fr) 1995-09-20 1998-07-08 IMZ-Fertigungs- und Vertriebsgesellschaft für dentale Technologie mbH Implant intra-osseux pour dent individuelle avec systeme antirotation

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US20070037123A1 (en) * 2000-10-26 2007-02-15 Mansueto Robert F High-strength dental-implant w/curvilinear-indexing and tool-free delivery-system
DE10129684B4 (de) * 2001-06-22 2004-06-17 Robert Laux Zahn- oder Kiefersegment auf einem Basisträger
CA2518312A1 (fr) * 2003-03-13 2004-09-23 Young Ku Heo Procede de traitement d'une prothese retenue par vis et ciment, butee et implant pour une prothese retenue par vis et ciment

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Publication number Priority date Publication date Assignee Title
EP0851744A1 (fr) 1995-09-20 1998-07-08 IMZ-Fertigungs- und Vertriebsgesellschaft für dentale Technologie mbH Implant intra-osseux pour dent individuelle avec systeme antirotation

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9468506B2 (en) 2011-12-30 2016-10-18 Nobel Biocare Services Ag Abutment position locator
US10390911B2 (en) 2011-12-30 2019-08-27 Nobel Biocare Services Ag Abutment position locator
US9681930B2 (en) 2014-12-15 2017-06-20 Jjgc Industria E Comercio De Materiais Dentarious S/A Implants for enhanced anchoring within bone
USD816841S1 (en) 2014-12-15 2018-05-01 Jjgc Industria E Comercio De Materiais Dentarios S/A Bone implant
USD837378S1 (en) 2014-12-15 2019-01-01 Jjgc Industria E Comercio De Materiais Dentarios S/A Bone implant
USD838369S1 (en) 2014-12-15 2019-01-15 Jjgc Industria E Comercio De Materiais Dentarios S/A Bone implant
USD845485S1 (en) 2014-12-15 2019-04-09 Jjgc Industria E Comercio De Materiais Dentarios S/A Bone implant
US10398533B2 (en) 2014-12-15 2019-09-03 Jjgc Industria E Comercio De Materiais Dentarios S/A Implants for enhanced anchoring within bone
WO2017137588A1 (fr) * 2016-02-10 2017-08-17 Nobel Biocare Services Ag Fixation dentaire pouvant être fixée à un composant dentaire et ensemble dentaire comprenant la fixation dentaire et le composant dentaire
US10898301B2 (en) 2016-05-05 2021-01-26 Jjgc Industria E Comercio De Materiais Dentarios S.A. Prosthetic assembly and method for producing the same

Also Published As

Publication number Publication date
HUP1000219A2 (en) 2012-03-28
WO2011132007A3 (fr) 2012-02-02
HU1000219D0 (en) 2010-06-28

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