WO2012085039A1 - Implant dentaire et trousse d'implant dentaire - Google Patents

Implant dentaire et trousse d'implant dentaire Download PDF

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Publication number
WO2012085039A1
WO2012085039A1 PCT/EP2011/073523 EP2011073523W WO2012085039A1 WO 2012085039 A1 WO2012085039 A1 WO 2012085039A1 EP 2011073523 W EP2011073523 W EP 2011073523W WO 2012085039 A1 WO2012085039 A1 WO 2012085039A1
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WO
WIPO (PCT)
Prior art keywords
implant
rotation
recesses
rotation means
secondary component
Prior art date
Application number
PCT/EP2011/073523
Other languages
English (en)
Inventor
Steffen Kuehne
Ulrich Mundwiler
Original Assignee
Straumann Holding 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 Straumann Holding Ag filed Critical Straumann Holding Ag
Publication of WO2012085039A1 publication Critical patent/WO2012085039A1/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
    • 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

Definitions

  • the invention relates to a dental implant for insertion into the jaw bone of a patient and to a secondary component for attachment to this implant.
  • a dental implant system is known from EP 1 139 906 Bl .
  • a dental implant for insertion into the jaw bone of a patient is provided with an internal bore having anti-rotation recesses. These anti-rotation recesses are for engagement by a driving tool when the dental implant is screwed into the jaw bone as well as for engagement by an abutment, when the abutment is mounted to the implanted dental implant by means of a particular screw.
  • the anti-rotation recesses are radially outlined by an octagon, thus each recess has a triangular cross section with two planar outside surfaces. Both the driving tool and abutment have corresponding anti-rotation protrusions such that these protrusions can fully engage the anti-rotation recesses of the implant.
  • the abutment is shaped to match the anti-rotation recesses of the implant, and hence any distortion of these recesses can affect the fit between implant and abutment, In particular, distortion of the recesses can lead to increased rotational play between the abutment and implant, which is highly undesirable.
  • WO2005/06781 One system designed to overcome this problem is disclosed in WO2005/06781 1.
  • This system provides an implant having an anti-rotation means comprised of two differently profiled sets of recesses. One of these sets is used to engage a driving tool and the other set engages the abutment. This ensures that the recesses intended for engagement with the abutment are undamaged by use of the driving tool.
  • EP1419746 discloses a similar system in which the two different sets of anti- rotation recesses are axially displaced from one another within the implant bore.
  • the present invention provides a dental implant system comprising a dental implant for insertion into the jaw bone of a patient and a secondary component for connection to said implant.
  • the implant comprises an elongated body having a longitudinal axis and a bore extending from the coronal end of the implant along the longitudinal axis.
  • the bore comprises a coronal truncated cone portion and an anti-rotation means radially limited by an annularly closed line varying between a major radius (a) and a minor radius (b) of the truncated cone portion, such that the anti-rotation means consists of a plurality of anti-rotation recesses located at least partially within the truncated cone portion.
  • the secondary component comprises an attachment portion for insertion into the bore of the implant which has a longitudinal axis that, in use, is coaxial with the longitudinal axis of the implant, the attachment portion comprising anti-rotation means radially limited by an annularly closed line varying between a maximum radius and a minimum radius, such that the anti-rotation means of the secondary component consists of a plurality of anti-rotation protrusions which can engage with but do not match any of the anti-rotation recesses of the implant.
  • the present invention provides a dental implant system comprising a dental implant for insertion into the jaw bone of a patient and a secondary component for connection to said implant.
  • the implant comprises an elongated body having a longitudinal axis and a bore extending from the coronal end of the implant along the longitudinal axis.
  • the bore comprises a cylindrical portion within which an anti-rotation means is radially limited by an annularly closed line varying between a major radius (a) and a minor radius (b), such that the anti-rotation means consists of a plurality of anti-rotation recesses which are equal in length and axial location.
  • the secondaiy component comprises an attachment portion for insertion into the bore of the implant which has a longitudinal axis that, in use, is coaxial with the longitudinal axis of the implant, the attachment portion comprising anti-rotation means radially limited by an annularly closed line varying between a maximum radius and a minimum radius, such that the anti-rotation means of the secondary component consists of a plurality of anti-rotation protrusions which can engage with but do not match any of the anti-rotation recesses of the implant.
  • secondary component it is meant one of numerous components which in use are mounted to the implant,
  • the secondary component can be a dental abutment, which in use acts a support for a dental prosthesis. This prosthesis can be cemented, screwed, directly veneered or otherwise attached to the abutment.
  • Other secondary components include, for example, healing caps and impression posts, which are attached to the implant on a temporary basis.
  • the anti-rotation means of the secondary component is shaped to engage with the anti-rotation means of the implant without precisely fitting any of the anti-rotation recesses.
  • the anti-rotation means of the secondary component is radially limited by an annularly closed line which partially corresponds to but is not identical to the annularly closed line which defines the anti-rotation recesses of the implant. This enables the anti- rotation means of the secondary component to engage with some portions of the anti-rotation recesses of the implant, i.e. at those areas at which the lines
  • implant anti-rotation means and secondary component anti-rotation means defined by annularly closed lines of different shapes. By this it is meant that the anti-rotation means differ from one another more than simply through an adjustment in dimensions.
  • the implant comprises, say, triangular anti-rotation recesses
  • the secondary component anti-rotation protrusions will not be smaller proportioned triangles but will have a different shape, for example, rectangular protrusions that can extend partially into the triangular recesses.
  • the dental implant system of the present invention thus allows for sections of the anti-rotation recesses to be distorted without having any effect on the connection between the implant and secondary component.
  • this result is achieved without requiring the addition of an extra dedicated set of anti-rotation recesses.
  • the existing anti-rotation means of the implant and/or the secondary component are adjusted such that the anti-rotation protrusions of the secondary component no longer exactly match any of the anti- rotation recesses of the implant.
  • the present invention therefore enables a single set of anti-rotation recesses to be used for both insertion and anti-rotation security whilst preventing any deformation of the recesses caused during insertion from affecting the fit of the secondary component.
  • the single set of recesses can be located either in a conical section of the implant, in which case the annularly closed line will vary between a major and minor radius of the conical portion, or it may be located in a cylindrical section of the implant bore, in which case the recesses will all have the same axial start and end points.
  • the anti-rotation recesses are located at least partially within the truncated cone portion it is meant that the recesses can extend axially beyond the cone portion.
  • the recesses will be fully radially contained within the cone.
  • the anti-rotation recesses are located entirely within the truncated cone, i.e. they do not extend apically of this.
  • the anti-rotation recesses of the implant extend both radially and axially between the major radius and minor radius. This helps to create a more compact bore and facilitates the manufacturing process as less material must be removed from the implant bore.
  • the anti-rotation means of the secondary component of the present invention is radially limited by an annularly closed line varying between a maximum radius and a minimum radius.
  • the maximum and minimum radii could be equivalent to the major and minor radii respectively, such that the anti- rotation protrusions extend to the radial extremities of the anti-rotation recesses, In accordance with the present invention however, in such circumstances the protrusions would not fill the recesses and thus areas of the side walls of the recesses would remain untouched by the protrusions and thus free for exclusive contact with the insertion tool.
  • the anti-rotation means are designed such that, in use, the protrusions do not contact the areas of the anti-rotation recesses that are subject to the greatest forces during insertion.
  • the maximum radius of the anti-rotation means of the secondary component is less than the major radius but greater than the minor radius of the anti-rotation means of the implant. In this way, the radially outer parts of the recesses are not contacted by the secondary component. It is these areas that will normally be subjected to the greatest torque during use of the insertion tool and hence these are the areas most likely to be distorted.
  • the radial depth of the anti-rotation recesses is given by the difference between the major and minor radii.
  • the maximum radius of the anti-rotation means of the secondary component is less than the sum of the minor radius plus half the radial depth of the anti-rotation recesses.
  • the anti-rotation protrusions are sized such that they do not extend into the radially outer half of the recesses. This enables this outer area to be used exclusively for torque transfer.
  • the anti-rotation protrusions are sized such that they extend no more than a quarter of the way into the recesses, i.e., the maximum radius is less than or equal to the sum of the minor radius plus a quarter of the radial depth.
  • the minimum radius of the secondary component anti-rotation means is less than or equal to the minor radius of the anti-rotation means of the implant.
  • the minimum radius of the anti-rotation means of the secondary component is equal to the minor radius of the anti-rotation means of the implant.
  • anti-rotation means of the implant and secondary component can be designed to have many alternative shapes that enable these means to be brought into partial contact such that the protrusions engage with the recesses without matching any of these.
  • the an nuisancearly closed line of the anti-rotation means of either the secondary component or implant is at least partially curved and the an nuisancearly closed line of the anti-rotation means of the other component is at least partially straight such that, when the secondary component is inserted into the implant, areas of curved anti-rotation means are aligned with areas of straight anti-rotation means.
  • Either the implant or secondary component can be provided with the partially rounded anti-rotation means.
  • the anti-rotation recesses of the implant may be straight walled and the anti-rotation protrusions formed by the anti-rotation means of the secondary component may be rounded at their radially outer ends such that these do not extend to the tips of the recesses.
  • conventional dental implants suffer from a particular problem. That is, when the dental implant is screwed into the jaw bone of a patient, there is some tendency that a phenomena occurs which is called cold welding or contact welding, whereby some small portions of the planar surfaces of the dental implant and of a matching bit tool which is used as a driving tool may strongly adhere to each other. After that, the bit tool has to be removed by applying some force, whereby the surfaces of the anti-rotation recesses may be damaged. Subsequently, it may be difficult to insert the abutment or other secondary component into the dental implant, and/or the inserted abutment may have a bad snug fit in the dental implant.
  • the anti-rotation means of the implant is radially limited by an annularly closed line varying between a major radius and a minor radius, wherein the line is at least partially curved so as to form rounded anti-rotation recesses.
  • the anti-rotation means is fully rounded, such that the radially outer boundary is formed by a continuous line with no angles or jumps.
  • the joining portion between the recesses may be straight.
  • the apical end of the conical portion or the geometric base of the cylindrical portion may be non-circular.
  • the contact surfaces there between are substantially larger than those in case of the said conventional dental implant, where the contact surfaces are more or less in line form.
  • the contact surfaces are two- dimensional, while in the said state of the art the contact surfaces are rather one- dimensional.
  • the present invention provides a dental implant system comprising a dental implant for insertion into the jaw bone of a patient and a secondary component for connection to said implant.
  • the implant comprises an elongated body having a longitudinal axis and a bore extending from the coronal end of the implant along the longitudinal axis.
  • the bore comprises an anti-rotation means radially limited by an at least partially curved annularly closed line varying between a major radius ( ) and a minor radius (b), such that the anti-rotation means consists of a plurality of rounded anti-rotation recesses.
  • the secondary component comprises an attachment portion for insertion into the bore of the implant which has a longitudinal axis that, in use, is coaxial with the longitudinal axis of the implant, the attachment portion comprising anti-rotation means radially limited by an annularly closed line varying between a maximum radius and a minimum radius, such that the anti-rotation means of the secondary component consists of a plurality of anti-rotation protrusions which can engage with but do not match any of the anti-rotation recesses of the implant.
  • This aspect of the present invention preferably comprises a single set of anti- rotation recesses, namely, the recesses are equal in length and axial location and are located in a cylindrical portion of the bore, or they are radially contained in a truncated cone portion of the bore having a major radius a and a minor radius b.
  • Other preferred features of this aspect of the invention are the same as described throughout this specification in relation to the other aspects of the invention.
  • the protrusions of the anti-rotation means of the secondary component are at least partially straight sided in order create the necessary discrepancies between the two anti-rotation means.
  • a further advantage of the curving of the anti-rotation recesses is that insertion of the bit tool is facilitated. Insertion of the tool, and of the secondary component, is even more facilitated by the provision of a truncated cone portion at the coronal end the bore.
  • the anti-rotation means of the implant is radially limited by an annularly closed continuous wave line undulating between a major radius and a minor radius.
  • continuous as used herein is to be understood in the mathematical sense, i.e. without any angles or jumps.
  • wave line and undulations as used herein denotes a kind of sine curves or combinations of sine curves. According to this preferred embodiment of the invention therefore, the radially external limitation of the anti-rotation recesses is totally rounded or curved without any edges.
  • the major radius and the minor radius differ by between approximately 5 and 10%, more preferably between 8 and 10%.
  • a preferred secondary component for use with curved recesses has an anti rotation means which is radially defined by an annularly closed line having linear sections, these sections being arranged to align, in use, with the curved recesses of the implant.
  • the anti-rotation means of the secondary component is polygonal in shape. In this way, the curved recesses of the implant can only partially contact the secondary component.
  • the anti-rotation means of the implant is defined by a continuous undulating line and the anti-rotation means of the secondary component is polygonal.
  • the polygon may be any shape, such as, for example a cross or star shape.
  • the anti-rotation means of the abutment forms a regular polygon, for example a square, pentagon, hexagon or octagon.
  • the vertices of the polygon form the maximum radius of the anti-rotation means and may, in certain embodiments, be rounded or beveled. In accordance with a preferred embodiment of the present invention these vertices are dimensioned to be smaller than the anti- rotation recesses of the implant such that the outer edges of the vertices can not, in use, contact the radial extremities of the recesses.
  • the attachment portion of the secondary component preferably further comprises, coronal of the anti-rotation means, a truncated cone portion complementary to that of the implant.
  • anterior refers to the direction towards the bone and “coronal” to the direction towards the teeth.
  • the apical part of a component is the part which, in use, is directed towards the jaw bone and the coronal part is that which is directed towards the oral cavity.
  • the lines which radially define the anti-rotation means of the implant and secondary component vary between the major and minor radius and maximum and minimum radii respectively. These variations may result in recesses being formed which do not extend to the maximum or minimum radius, however in accordance with the present invention none of these recesses are completely matched by any of the anti-rotation protrusions of the secondary component.
  • annularly closed lines which radially define the anti-rotation means of the implant and secondary component alternate between the major and minor radius and maximum and minimum radii respectively. This requires that in between each maximum/major radius peak, there is a
  • the protrusions of the secondaiy component all begin at the minimum radius and extend to the maximum radius.
  • the annularly closed lines which define the anti-rotation means alternate smoothly, such that there are no intermediate inflections or discontinuities (such as changes in curvature, angle etc) between the major/maximum peak and the minor/minimum low. This creates a simple shape for the anti-rotation means and improves force distribution.
  • the anti-rotation contour of the implant may be uniformly shaped, such that identical recesses are spaced at regular intervals about the longitudinal axis of the implant.
  • the secondary component can be designed with similarly spaced protrusions such that a
  • the recesses are arranged pairwise equidistantly around the longitudinal axis, with the angular distance between the peaks of each pair of recesses being less than and preferably
  • the anti-rotation means of the secondary component comprises an even sided regular polygon, the polygon and recesses being shaped such that the sides of the polygon have a length greater than the minimum distance between the peaks of each pair of recesses.
  • this configuration has been found to be particularly beneficial as only half of the polygon sides align with the double peaks, whereas the other half of the polygon sides are in much closer contact with the implant. Therefore, this embodiment provides areas of non-contact between the anti rotation means of the implant and secondary component while still providing sufficient contact to limit rotational play between the implant and secondary component.
  • the recesses of each pair may be joined by a line segment and/or neighbouring pairs of recesses may be joined by a line segment. This enables a better engagement with the polygonal sides of the secondary component.
  • the recesses are arranged pairwise equidistantly around the longitudinal axis; the angular distance between the peaks of each pair of recesses is substantially smaller than and preferably approximately half of the angular distance between neighboured peaks of two neighboured pairs; the recesses are rounded; the anti-rotation means of the secondary component is a polygon; the number of the recesses is eight; and the dental implant is of titanium or a titanium alloy or ceramics.
  • the anti rotation recesses begin at a location axially removed from the coronal end of the implant. This results in the anti-rotation recesses beginning within the bore. This is particularly important in the present invention as the abutment does not exactly match the anti-rotation recesses of the implant.
  • the secondary component preferably comprises, coronal of the anti-rotation means, a complementary
  • the system of the present invention preferably further comprises a tool for inserting the dental implant into the bone, comprising a tool tip which is profiled to at least partially engage with the same anti-rotation recesses as the anti-rotation means of the secondary component
  • the tool tip is shaped to come into exclusive engagement with at least the radially outer sections and more preferably at least the radially outer quarter, most preferably the radially outer half of the anti-rotation recesses.
  • the tool tip is preferably shaped such that it extends further into the anti-rotation recesses than the anti-rotation protrusions of the secondary component, such that it engages with the anti-rotation recesses at more radially outer areas than the secondary component anti-rotation protrusions.
  • the "exclusive" nature of the contact between the tool tip and outer areas of the implant recesses refers specifically to the system of implant, secondary component and tool.
  • the engagement is a form fit engagement, namely, the contour of the tool tip matches, as far as possible taking into consideration manufacturing tolerances, the contour of the anti-rotation recesses in the areas where these components are to engage.
  • the tool can be designed such that it does not fully engage the anti-rotation means of the implant.
  • the tool tip is designed to contact the same anti-rotation recesses as the anti- rotation protrusions but in different areas. In this way certain sections, preferably the outermost sections, of the anti rotation recesses will be engaged exclusively by the driving tool and other sections, preferably the radially inner sections of the anti-rotation recesses, will be engaged exclusively by the secondary component.
  • the tool tip is profiled to come into engagement with the implant anti-rotation means along the full radial depth of the implant anti-rotation recesses. In such embodiments some areas of the recesses will be engaged by both the tool tip and the secondaiy component.
  • the cross-sectional area of the tool tip is constant over a given length of its longitudinal axis in order to facilitate manufacturing of the tool, and the tool may have a necking which represents a breaking point.
  • the secondary component is an abutment for supporting a dental prosthesis.
  • the present invention provides a dental implant system comprising a dental implant for insertion into the jaw bone of a patient, the implant comprising an elongated body having a longitudinal axis and a bore extending from the coronal end of the implant along the longitudinal axis, said bore comprising anti-rotation means radially limited by an annularly closed line varying between a major radius and a minor radius, such that the anti-rotation means consists of a plurality of anti- rotation recesses located within the bore.
  • the system further comprises a tool for inserting the implant into a jaw bone, the tool comprising a distal end for insertion into the implant bore, which has a longitudinal axis that, in use, is co-axial with the longitudinal axis of the of the implant, said distal end comprising torque transfer means radially limited by an annularly closed line varying between a maximum radius and a minimum radius such that the torque transfer means comprises a plurality of torque transmission protrusions which can engage the anti-rotation recesses of the implant.
  • the system further comprises a secondary component for connection to said implant, comprising an attachment portion for insertion into the bore of the implant which has a longitudinal axis that, in use, is co-axial with the longitudinal axis of the of the implant, the attachment portion comprising anti-rotation means radially limited by an annularly closed line varying between a maximum radius and a minimum radius such that the anti-rotation means comprises a plurality of anti-rotation protrusions which can engage with the anti-rotation recesses of the implant, wherein the torque transmission protrusions engage with the same implant anti-rotation recesses as the secondary component anti-rotation protrusions, the torque transmission protrusions however being shaped such that they engage the anti-rotation recesses at more radially outer areas of the recesses than the anti-rotation protrusions of the secondary component.
  • a single set of recesses can be used both to transmit torque to the implant and prevent rotation of a secondary component, while at the same time any distortion suffered by the recesses during torque transfer has a minimised effect on the fit of the anti-rotation means of the implant and secondary component.
  • the anti-rotation means of the secondary component and torque transfer means of the insertion tool while both shaped to engage with the anti-rotation means of the implant, have different cross- sectional profiles to one another.
  • the maximum radius of the torque transmission protrusions is greater than that of the anti-rotation protrusions, such that the torque transfer means engages with the anti-rotation recesses of the implant at more radially outer areas than the secondary component.
  • the implant anti-rotation means may comprise curved recesses while the secondary component anti-rotation means comprises a generally polygonal cross-section.
  • the torque transmission protrusions of the tool are curved such that these conform to at least the radially outer quarter, more preferably at least the radially outer half of the recesses of the implant.
  • the maximum radius of the torque transfer means is approximately equal to the major radius of the anti-rotation recesses such that torque transmission can occur at the radially outermost part of the recesses.
  • the maximum radius of the anti- rotation protrusions is less than the maximum radius of the torque transmission protrusions and thus the major radius of the implant anti-rotation recesses.
  • the maximum radius of the anti-rotation protrusions is less than the sum of the minor radius plus half the radial depth of the recesses. In all embodiments the maximum radius of the anti-rotation protrusions is greater than the minor radius of the implant recesses so that engagement can occur. In one preferred embodiment the anti-rotation recesses are uniformly shaped and spaced about the longitudinal axis. Also or alternatively the annularly closed line defining the implant anti-rotation means may preferably alternate between the major and minor radii, more preferably smoothly alternate.
  • Fig. 1 shows a top view from a coronal end of a dental implant
  • Fig. 2 shows a partial longitudinal section of the dental implant of Fig. 1 ;
  • Fig. 3 shows a scaled down perspective view of the dental implant of Figs. 1 and 2;
  • Fig. 4 shows a perspective view of a dental abutment for use with the implant of Figs. 1 to 3;
  • Fig. 5 shows a cross section through the aligned anti-rotation means of the implant of Fig. 1 and abutment of Fig. 4;
  • Figs. 6-8 show alternative anti-rotation means according to the present invention.
  • Fig. 9 shows a top view from the implant side end of a tool for insertion of the dental implant of Figs. 1 to 3 into the bone of a patient;
  • Fig. 10 shows a lateral view of the tool of Fig. 9;
  • Fig. 1 1 shows a scaled down perspective view of the tool of Figs. 9 and 10;
  • Fig. 12 shows the implant anti-rotation means of Fig. 7 in combination with a cross-section of a suitable torque transfer means
  • Fig, 13 shows the implant anti-rotation means of Fig. 8 in combination with a cross-section of a suitable torque transfer means.
  • a dental implant 1 for insertion into the jaw bone of a patient has a substantially axially-symmetric elongated body extending along a longitudinal axis 2 and consisting of titanium or a titanium alloy.
  • An apical part 4 of the dental implant 1 which is to be located inside the bone may have external threads 6.
  • a coronal implant part 8 on the other end of the dental implant 1 has an axial bore 10 which is a blind hole extending along the longitudinal axis 2.
  • the axial bore 10 has an apical threaded portion 12 with internal threads 14 and a coronal truncated cone portion 16.
  • the inner surface of the coronal truncated cone portion 16 tapers inwards towards the apical end from the coronal end of the implant.
  • an anti-rotation means 5 comprising a plurality of anti-rotation recesses 18 which extend axially and radially between a major radius a and a minor radius b of the truncated cone portion 16.
  • the anti-rotation recesses 18 are formed by projecting an annularly closed continuous wave line 20, which undulates and smoothly alternates radially between the major radius a and the minor radius b, along the longitudinal axis 2 into the truncated cone portion 16, and by removing any material inside the projected annulaiiy closed continuous wave line 20.
  • the anti-rotation recesses 18 can be fabricated by a milling tool, whose cutting edge is moved along the whole annul arly closed wave line 20, for example by moving the milling tool 360° around the longitudinal axis 2 while simultaneously displacing the tool radilally to follow wave line 20.
  • Many other well known manufacturing methods can however also be used to create the anti-rotation recesses.
  • the anti-rotation recesses 18 are radially outwardly limited by the annularly closed continuous wave line 20 undulating radially between the major radius a and the minor radius b of the truncated cone portion 16, as seen in Fig, 1.
  • the anti-rotation recesses 18 extend in the axial direction from a substantially ring-shaped bottom area 22, which is radially outwardly limited by the annularly closed continuous wave line 20, up to a top wave line 24.
  • the top wave line 24 is the intersection of the axial projection of the wave line 20 with the inner surface of the truncated cone portion 16.
  • the top wave line 24 undulates in the direction of the longitudinal axis 2 with an amplitude c.
  • the amplitude c of the the top wave line 24 in the axial direction is a multiple of the amplitude (a-b) of the wave line 20 in the radial direction.
  • the annularly closed continuous wave line 20 forms eight recesses 18,
  • the recesses 18 are arranged pairwise equidistantly about the longitudinal axis 2.
  • the angular distance with respect to the longitudinal axis 2 between the peaks 19 of each pair of recesses 18 is about 30°, and the angular distance between neighbored peaks 19 of two neighbored pairs of recesses 18 is about 60°.
  • the wave line 20 alternates between the major radius a and minor radius b, each peak 19 has major radius a.
  • each pair of closely adjacent recesses 18 forms a so-called “camelback” double recess, and that four “camelbacks” are arranged with angular distances of 90° around the longitudinal axis 2.
  • annularly closed continuous wave line 20 with alternating angular distances is obtainable by some mathematical combination of different annularly closed sine curves.
  • the anti-rotation means 5 is formed in a truncated cone portion 16 it is also possible for the same annularly closed line 20 to define the same anti-rotation recesses 18 within a cylindrical portion of the bore. In such cases, the whole of each recess will have the same start and end axial locations. In other words, there will be no top wave line 24 which undulates in the longitudinal direction,
  • Fig 4 shows an abutment 25 for use with the implant 1 of Figs. 1 to 3. It comprises an attachment portion 29 for insertion into the bore 10 and an occlusal portion 21 which in use extends coronally from the implant into the oral cavity of the patient. This portion can this be used to support a dental prosthesis.
  • the attachment portion 29 comprises anti-rotation means 28 shaped for partial engagement with the anti-rotation means 5 of the implant 1.
  • the anti-rotation means 28 is radially limited by an annularly closed line that smoothly alternates between a maximum and minimum radius to form an octagon.
  • the attachment portion 29 further comprises, coronally of the anti-rotation means 28, a truncated cone portion 27 which is complementary in shape to the surface of the truncated cone portion 16 of the dental implant 1. These complmentary cone portions 27, 16 come into frictional surface contact when the abutment 25 is mounted onto the dental implant 1.
  • the anti-rotation means 28 of the abutment 25 is axially aligned with the anti-rotation means 5 of the implant 1, but the non identical shapes of these components means that the octagon does not completely match any of the anti-rotation recesses 18.
  • a cross section through the aligned anti-rotation means 28, 5 is shown in Fig 5, however the gap between abutment and implant anti-rotation means is exaggerated for clarity..
  • the contact between the implant 1 and abutment 25 is enough to prevent relative rotation between the two components but also leaves areas of the anti-rotation recesses 18 free for exclusive engagement by a driving tool. Any resulting deformation of these areas will not affect the fit or rotational play between the implant 1 and abutment 25.
  • the camelback pairing of the anti-rotation recesses 18 results in the peaks 19 of each pair aligning with a single side of the octagon, i.e the length of one side of the octagon is greater than the length between each peak 19 of the camelback pair This leaves alternate sides of the octagon free to engage with sections of the anti- rotation means 5 having a smaller radius and thus provides a closer contact between the implant and abutment.
  • Fig. 6 shows a combination very similar to that of Fig. 5, however, in contrast to the implant of Fig. 1 the anti-rotation means 65 of the implant 61 comprises straight sided sections 62 joining each pair of camel backs. This provides a closer fit to the abutment 25 in these areas.
  • Fig. 7 shows an alternative configuration in which the anti-rotation means 75 of the implant 71 comprises four rounded recesses 78 arranged at angles of 90° to each other.
  • the abutment 95 comprises a cross-shaped polygonal anti-rotation means 98 wherein each arm has a smaller maximum length than the major radius of the anti-rotation recesses 78. Therefore, although the anti-rotation means 98 of the abutment 95 engages the anti-rotation means 75 of the implant 71 to prevent relative rotation of these components, the outermost sections of the anti-rotation recesses 78 are not contacted by the abutment and hence any distortion of these sections does not interfere with the implant/abutment connection.
  • Fig. 8 shows an alternative embodiment in which the anti-rotation means 85 of the implant 81 is formed by straight line segments and the abutment anti-rotation means 108 is radially limited by a partially curved closed line.
  • Figs. 6-8 could be formed either in a truncated cone portion of the implant or in a cylindrical portion.
  • Figs. 9 to 11 show an elongate bit tool 35 which can be used for insertion of the dental implant of Fig. 1 to 3 into the jaw bone of a patient.
  • An implant side tip 26 of the tool is shaped to come in form fit with the radially outer sections of recesses 18 of the dental implant.
  • the implant side tip 26 has eight torque transmission projections 38 each extending longitudinally at the outer
  • the implant side tip 26 circumference the implant side tip 26.
  • These projections 38 are radially limited by an annulaiiy closed line and form torque transfer means 36.
  • the projections 38 With respect to a longitudinal axis 30 of the tool and its implant side tip 26, the projections 38 have a similar cross section to and are arranged in the same angular pattern as the recesses 18 with respect to the longitudinal axis 2 of the dental implant 1.
  • the maximum radius of the projections 18 is substantially equal to the major radius a of the implant recesses 18. Therefore, the tool tip 26 engages with a large area of the implant recesses 18, including the radially outermost areas of these. This is in contrast to the anti-rotation means 28 of abutment 25, which only engages the radially inner most areas of the recesses 18.
  • any distortion caused to the radially outer areas of recesses 18 during use of the tool 35 will not have any affect on the fit of the abutment 25.
  • the minimum radius of the projections 38 is less than the minor radius b of the recesses 18, such that the tool tip 26 does not contact the radially innermost areas of the implant anti-rotation means 5, enabling these areas to be exclusively engaged by the abutment 25.
  • the eight projections 38 engage with the recesses 18.
  • the tool tip 26 When the tool tip 26 is fitted within the recesses 18, it does not contact the surface of the truncated cone portion 16 of the dental implant. Thus, the surface of the truncated cone portion 16 would not be damaged by the tool tip 26.
  • This tool can also be used with an implant in which the anti-rotation recesses are formed in a cylindrical portion of the bore.
  • a standard hexagon 32 for engagement by a standard driving tool which is driven manually in order to screw the dental implant into the bone.
  • the driving side end may be configured for attachment to an automated driving tool, such as a dental hand piece.
  • the tool has a radial necking 34 or reduction in its cross section which forms a breaking point in order to prevent overturning when the dental implant is screwed into the bone.
  • Figs. 12 and 13 show further possible cross-sections for torque transfer means in accordance with the present invention.
  • Fig. 12 shows the anti-rotation means 75 of implant 71 of Fig. 7, with the corresponding anti-rotation means 98 of the abutment 95 shown in dashed lines.
  • the cross-section of the torque transfer means 126 has a greater maximum radius than the maximum radius of the abutment anti-rotation means 98 and matches, as far as practically possible in view of manufacturing tolerance limits, the shape of the radially outermost areas of the anti-rotation recesses 78.
  • Figs. 12 and 13 show a slight gap between the implant anti-rotation means and torque transfer means at areas where these two components are said to "match".
  • the torque transfer means 126 is shaped such that it does not contact the implant anti- rotation means 75 at its radially innermost areas. It is these areas which will be contacted by the abutment anti-rotation means 95. The shape of the torque transfer means 126 therefore ensures that any damage suffered by the implant anti- rotation means 75 during insertion will not affect the fit of the abutment to the implant.
  • Fig. 13 shows the implant anti-rotation means 85 of Fig. 8, again with the abutment anti-rotation means 108 shown in dotted lines.
  • the tool torque transfer means 136 exactly matches, as far as practically possible in view of manufacturing tolerance limits, the anti-rotation means 85 of the implant 81.
  • the torque transfer means 136 also engages the radially outer areas of the implant anti-rotation means 85, where the greatest torque will be experienced. Thus, any distortion is likely to occur in these areas rather than at the radially inner areas of the anti-rotation means 85, where the abutment contacts the anti-rotation means. Thus, this embodiment also prevents or reduces damage to the implant during insertion from affecting the fit of the abutment.
  • the implant and/or abutment may be made of a ceramic material.
  • the abutment could also be any other secondary component for attachment to the implant.
  • the bit tool may only contact certain areas of these recesses, in particular the radially outer parts of the recesses.
  • Embodiments in which the anti-rotation protrusions extend to the peaks of the recesses are also possible, wherein the protrusions do not entirely contact the side walls of the recesses.

Landscapes

  • 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)
  • Dental Prosthetics (AREA)

Abstract

L'invention porte sur un système d'implant dentaire, comprenant un implant dentaire destiné à être introduit dans l'os de mâchoire d'un patient et un composant secondaire destiné à être relié à l'implant. L'implant (1) comprend un corps allongé ayant un axe longitudinal (2) et une tête d'implant coronaire (8) ayant un alésage (10) qui a une partie de cône tronquée coronaire (16) s'étendant radialement autour de l'axe longitudinal et un moyen anti-rotation (5) limité radialement par une ligne fermée de manière annulaire (20) variant entre un rayon majeur (a) et un rayon mineur (b) de la partie de cône tronquée (16), de telle sorte que le moyen anti-rotation est constitué d'une pluralité de renfoncements anti-rotation (18) situés au moins partiellement à l'intérieur de la partie de cône tronquée. En variante, le moyen anti-rotation peut être situé dans une partie cylindrique de l'alésage de telle sorte que chaque renfoncement a la même longueur et le même emplacement axial. Le composant secondaire (25) comprend une partie de fixation (29) destinée à être introduite dans l'alésage de l'implant qui a un axe longitudinal qui, en utilisation, est coaxial avec l'axe longitudinal de l'implant, la partie de fixation comprenant un moyen anti-rotation (28) limité radialement par une ligne fermée de manière annulaire variant entre un rayon maximal et un rayon minimal, de telle sorte que le moyen anti-rotation du composant secondaire est constitué d'une pluralité de saillies anti-rotation qui peuvent venir en prise avec, mais ne correspondent pas à, l'un quelconque des renfoncements anti-rotation de l'implant.
PCT/EP2011/073523 2010-12-23 2011-12-21 Implant dentaire et trousse d'implant dentaire WO2012085039A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10196736 2010-12-23
EP10196736.2 2010-12-23

Publications (1)

Publication Number Publication Date
WO2012085039A1 true WO2012085039A1 (fr) 2012-06-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021505257A (ja) * 2017-12-04 2021-02-18 メガジェン インプラント カンパニー リミテッドMegagen Implant Co., Ltd. 歯科用インプラントのフィクスチャー
WO2021234142A1 (fr) * 2020-05-22 2021-11-25 medentis medical GmbH Implant, structure et système d'implant

Citations (7)

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Publication number Priority date Publication date Assignee Title
EP1419746A2 (fr) 2002-11-13 2004-05-19 Implant Innovations, Inc. Système d'implant dentaire
US20050065525A1 (en) * 2001-09-06 2005-03-24 Noble Biocare Ab (Publ) Implant, and tightening member and spacer member for such an implant
WO2005067811A1 (fr) 2003-12-19 2005-07-28 Niznick Gerald A Implant dentaire intra-osseux
EP1139906B1 (fr) 1998-12-28 2006-06-07 Institut Straumann AG Assemblage d'un implant dentaire et d'un pilier
US20080261176A1 (en) * 2007-04-23 2008-10-23 Nobel Biocare Services Ag Dental implant and dental component connection
US20080299516A1 (en) * 2005-04-12 2008-12-04 Eduardo Anitua Aldecoa Dental Implant, Pieces to be Connected to a Dental Implant, and the Internal Connection Between the Dental Implant and Each Piece
US20090298014A1 (en) * 2008-05-28 2009-12-03 Global Implant Solutions, Llc Dental Implant

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1139906B1 (fr) 1998-12-28 2006-06-07 Institut Straumann AG Assemblage d'un implant dentaire et d'un pilier
US20050065525A1 (en) * 2001-09-06 2005-03-24 Noble Biocare Ab (Publ) Implant, and tightening member and spacer member for such an implant
EP1419746A2 (fr) 2002-11-13 2004-05-19 Implant Innovations, Inc. Système d'implant dentaire
WO2005067811A1 (fr) 2003-12-19 2005-07-28 Niznick Gerald A Implant dentaire intra-osseux
US20080299516A1 (en) * 2005-04-12 2008-12-04 Eduardo Anitua Aldecoa Dental Implant, Pieces to be Connected to a Dental Implant, and the Internal Connection Between the Dental Implant and Each Piece
US20080261176A1 (en) * 2007-04-23 2008-10-23 Nobel Biocare Services Ag Dental implant and dental component connection
US20090298014A1 (en) * 2008-05-28 2009-12-03 Global Implant Solutions, Llc Dental Implant

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021505257A (ja) * 2017-12-04 2021-02-18 メガジェン インプラント カンパニー リミテッドMegagen Implant Co., Ltd. 歯科用インプラントのフィクスチャー
JP7138707B2 (ja) 2017-12-04 2022-09-16 メガジェン インプラント カンパニー リミテッド 歯科用インプラントのフィクスチャー
WO2021234142A1 (fr) * 2020-05-22 2021-11-25 medentis medical GmbH Implant, structure et système d'implant

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