KIT FOR THE IMPLANTATION OF A DENTAL IMPLANT

Abstract

The present invention provides a kit for use for the implantation of a dental implant, comprising an implant guide comprising a proximal end and a distal end, wherein the distal end is configured to be detachably attached to a dental implant, said implant guide comprising a cylindrical body, wherein the cylindrical body comprises a cylindrical outer surface and a circumferential groove in the outer surface, and a template configured to be arranged at a predetermined location with respect to a jaw, wherein the template comprises at least one implantation channel to guide the cylindrical body of the implant guide in a desired implantation direction during implantation of a dental implant in the jaw, and a stop surface at an end of the implantation channel.

The kit comprises a stop element comprising a first part and a second part, wherein the first part and the second part are configured to be movable between a first state, in which the first part and the second part are spaced at a first distance, and a second state, in which the first part and the second part are spaced at a second distance, wherein the first distance is smaller than the second distance, and wherein the first and second parts are biased to the first state, wherein the second distance is the same or larger than a distance between diametrically opposite sides of the outer surface of the implant guide, such that, before implantation, the first part and the second part can be arranged, in the second state, on diametrically opposite sides of the outer surface, and that during movement in the implantation direction of the dental implant into the jaw, the stop surface of the implantation channel will push the stop element towards the groove until the groove will allow the first and second part to move towards the first state and the stop element will be caught by the groove, therewith blocking further movement of the implant guide in the implantation direction.

Claims

1. Kit for use for the implantation of a dental implant, comprising: an implant guide comprising a proximal end and a distal end, wherein the distal end is configured to be detachably attached to a dental implant, said implant guide comprising a cylindrical body, wherein the cylindrical body comprises a cylindrical outer surface and a circumferential groove in the outer surface, and a template configured to be arranged at a predetermined location with respect to a jaw, wherein the template comprises at least one implantation channel to guide the cylindrical body of the implant guide in a desired implantation direction during implantation of a dental implant in the jaw, and a stop surface at an end of the implantation channel, characterized in that the kit comprises a stop element comprising a first part and a second part, wherein the first part and the second part are configured to be movable between a first state, in which the first part and the second part are spaced at a first distance, and a second state, in which the first part and the second part are spaced at a second distance, wherein the first distance is smaller than the second distance, and wherein the first and second parts are biased to the first state, wherein the second distance is the same or larger than a distance between diametrically opposite sides of the outer surface of the implant guide, such that, before implantation, the first part and the second part can be arranged, in the second state, on diametrically opposite sides of the outer surface, and that during movement in the implantation direction of the dental implant into the jaw, the stop surface of the implantation channel will push the stop element towards the groove until the groove will allow the first and second part to move towards the first state and the stop element will be caught by the groove, therewith blocking further movement of the implant guide in the implantation direction.

2. Kit as claimed in claim 1, wherein the template is patient specific and wherein a location of the stop surface is selected to define a desired implantation depth of a dental implant.

3. Kit according to claim 1, wherein the groove comprises a groove bottom, and wherein the first distance between the first part and the second part is larger than a groove diameter of the groove bottom.

4. Kit as claimed in claim 1, wherein the first part and the second part have a height which is smaller than a groove width of the groove.

5. Kit as claimed in claim 3, wherein the height and the first distance are selected such that clearance of the first part and second part in the groove indicates that the dental implant is arranged at the desired implantation depth.

6. Kit as claimed in claim 5, wherein the height and the first distance are selected such that a clamped position of the first part and second part in the groove indicates that the dental implant is moved too far into the jaw.

7. Kit as claimed in claim 1, wherein the stop element comprises a connection part connecting the first part and the second part.

8. Kit as claimed in claim 1, wherein the connection part, the first part and the second part form an open ring shape.

9. Kit as claimed in claim 7, wherein the stop element comprises a first extension extending from the first part and a second extension extending from the second part, wherein a movement of the first extension towards the second extension results in the first and second part moving from the first state to the second state.

10. Kit as claimed in claim 1, wherein the stop element is made of resilient material.

11. Kit as claimed in claim 1, wherein the groove has a substantially rectangular cross section.

12. Kit as claimed in claim 1, wherein the first part and the second part each have a substantially rectangular cross section.

13. Kit as claimed in claim 1, comprising a dental implant to be placed in the jaw of a patient.

14. Kit as claimed in claim 1, wherein the stop element and implantation guide are provided in one or more standard sizes.

15. Method for providing a template for use in placement of a dental implant in the jaw of a patient using the kit of any of the preceding claims, comprising the steps of: determining a model of the jaw in which the dental implant should be implanted; determining a desired implantation direction and implantation depth of the dental implant; designing the template, wherein the step of designing comprises the steps of: modelling a template shape that can be arranged at a predetermined location with respect to a jaw; modelling at least one implantation channel in the template configured to guide a cylindrical body of an implant guide in the desired implantation direction; and modelling a stop surface configured to limit movement of the dental implant into the jaw to the desired implantation depth, and manufacturing the template.

Description

[0036] Further details and advantages of an embodiment of the invention will now be described, whereby reference will be made to the accompanying drawings, in which:

[0037] FIG. 1 shows, schematically, a template of an embodiment of a kit according to the invention;

[0038] FIG. 2 shows, schematically, an implant guide of an embodiment of a kit according to the invention;

[0039] FIG. 3 shows, schematically, a dental implant of an embodiment of a kit according to the invention;

[0040] FIG. 4 shows, schematically, a stop element of an embodiment of a kit according to the invention; and

[0041] FIGS. 5-7 show steps of the implantation of a dental implant using the embodiment of the kit shown in FIGS. 1-4.

[0042] The present invention relates to a kit for the implantation of a dental implant in the jaw of a patient. The parts of this kit are separately shown in FIGS. 1-4, respectively.

[0043] FIG. 1 shows a template 10 to be used during implantation of a dental implant in a jaw. The template is preferably made patient specific in such a way that the template can easily be arranged in a unique fixed positional relationship with respect to the jaw, using patient specific characteristic features, such as size and position of teeth or preinstalled references e.g. (mini-)implants.

[0044] The template may, during the implantation procedure temporarily be fixed to the jaw to ensure that this positional relationship is maintained during the implantation procedure.

[0045] The template 10 may be manufactured on the basis of a model, in particular a computer model obtained by imaging techniques or conventional techniques. Any suitable technique, such as a plaster mould, the use of CAD CAM, rapid prototyping or 3D printing may be used to manufacture the template 10.

[0046] The template 10 comprises a number of implantation channels 11 which define a desired implantation direction of a dental implant to be implanted in the jaw. The implantation channels 11 are typically straight cylindrical channels running through the template 10. The location and direction of the implantation channels 11 are also typically patient specific and therefore designed for a specific patient.

[0047] The template comprises a jaw side directed to the jaw during implantation and an opposite side which faces away from the jaw when the template is arranged in the correct implantation position. At the end of each implantation channel 11 at the opposite side of the implantation channel, i.e. the proximal end of the implantation channel seen in the implantation direction, stop surfaces 12 are provided. These stop surfaces 12 are configured to cooperate with stop elements 40 as will be described hereinafter, and define the implantation depth of the dental implants 30.

[0048] FIG. 2 shows an implant guide 20 which is used to correctly implant a dental implant into a jaw. FIG. 3 shows a dental implant 30. The dental implant 30 comprises a screw thread 32 to screw the dental implant 30 into a predrilled bore in the jaw in which it is placed. Any other fixation technique for the dental implant in the jaw, such as cementing or locking rims may also be used.

[0049] During implantation, the implant guide 20 and the dental implant 30 are connected to each other and placed into the jaw by advancing the combination of implant guide 20 and dental implant 30 through the respective implantation channel 11 of the template 10.

[0050] The implant guide 20 comprises a proximal end and a distal end. At the distal end of the implant guide 20 a connection device 21 is provided which is configured to cooperate with a connection device 31 of the dental implant 30 to detachably connect the dental implant 30 to the implant guide 20, at least during implantation of the dental implant 30 in the jaw. Connection devices 21, 31 to connect the dental implant 30 and the implant guide 20 are known in the art.

[0051] The implant guide 20 further comprises a cylindrical body 22 having a diameter which is substantially the same or slightly smaller than a diameter of the respective implantation channel 11 to ensure that a longitudinal axis of the implant guide 20 and a longitudinal axis of the implantation channel 11 remain aligned during implantation of the dental implant, therewith ensuring a correct implantation direction of the dental implant.

[0052] The cylindrical body 22 comprises an outer surface 23 in which a circumferential groove 24 is provided. The groove 24 has a substantially rectangular cross section having a groove bottom 25 and substantially straight groove sides.

[0053] FIG. 4 shows a stop element 40 of the kit comprising a first part 41 and a second part 42. The first part 41 and the second part 42 are connected to each other by a connection part 43. The first part 41, the second part 42 and the connection part 43 together form an open ring shape with an open ring inner diameter which is larger than the diameter of the groove bottom 25 but smaller than the diameter of the outer surface 23. The height of the first part 41, the second part 42 and the connection part 43 is smaller than the width of the groove 24 such that the open ring shape, when desired, can be arranged, at least partially, in the groove 24 of the implant guide 20.

[0054] The stop element 40 is made of resilient material, for example resilient plastics material or resilient metal, such that the first part 41 and the second part 42 can be moved from a relaxed first state, as shown in FIG. 4, to a second extended state in which a distance between the first part 41 and the second part 42 is increased to a distance larger than the diameter of the outer surface 23 of the implant guide 20. Thus, in this second state the stop element 40 can be placed on this outer surface 23, in particular at a distal side of the groove 24.

[0055] The stop element 40 comprises a first extension part 44 and a second extension part 45 which facilitate the movement of the first part 41 and second part 42 from the first state to the second state by a movement of the first extension part 44 and the second extension part 45 towards each other, as indicated by arrows A. This movement A can easily be carried out by pinching the first extension part 44 and second extension part 45 towards each other by thumb and index finger of a user. By pinching the first extension part 44 and the second extension part 45 towards each other, the first part 41 and second part 42 can be moved over the outer surface 23 so that the stop element is clamped on the outer surface 23.

[0056] It is remarked that since the template 10 may be custom made for each patient, the implant guide 20, the dental implant 30 and the stop element 40 may be standard elements, that can be provided in one or more standard sizes.

[0057] The use of the kit comprising the template 10, the implant guide 20, the dental implant 30 and the stop element 40, will now be described with reference to FIGS. 5, 6 and 7.

[0058] FIG. 5 shows the combination of implant guide 20 and dental implant 30 during the first part of the implantation of the dental implant 30. The template 10 was designed and manufactured in order to provide implantation channels 11 configured to drill bore holes in the jaw and to subsequently guide implant guides 20 to correctly place dental implants 30 into the respective bore holes 51.

[0059] Further, the stop surfaces 12 of the template 10 were designed such that when the respective stop element 40 is arranged in the groove 24 of the implant guide 20 and contacts the stop surface 12 of the template 10, the desired implantation depth of the dental implant 30 is reached.

[0060] In FIG. 5, the template 10 is placed in its desired unique position with respect to a jaw 50, such that the implantation channel 11 in the template 20 is arranged to maintain the longitudinal axis of the dental implant 30 in the desired implantation direction B and the dental implant 30 is correctly moved into the predrilled bore hole 51.

[0061] The stop element 40 is arranged with its first part 41 and second part 42 in the second, extended, state on the outer surface 23 of the implant guide 20 at a position distal from the groove 24. In FIG. 5, the stop surface 12 is still spaced from the groove 24 and the stop element 40, indicating that the desired implantation depth has not yet been reached.

[0062] FIG. 6 shows the combination of implant guide 20 and dental implant 30 advanced further into the bore hole 51. The stop element 40 is still in the same position with respect to the implant guide 20, but the stop element 40 has moved up to the stop surface 12 on the template 11 and is in contact with the stop surface 12.

[0063] When the implant guide 20 is moved further in the implantation direction B, the stop surface 12 will push the stop element 40 in proximal direction to slide over the outer surface 23 in proximal direction of the implant guide 20, i.e. in the direction of the groove 24, until the stop element 40 reaches the groove 24. When the distal side of the stop element 40 moves past the distal side of the groove 24, the outer surface 23 will no longer hold the stop element 40 in the extended state, and the stop element may move into the groove 24 and to the first, relaxed, state.

[0064] FIG. 7 shows this position of the implant guide 20, in which the stop element 40 has moved into the groove 24 which indicates that the desired implantation depth has been reached.

[0065] The use of the stop element 40 has the advantage that during the movement of the implant guide 20 in the implantation direction, the stop element 40 will automatically move into the groove and indicate that the desired implantation depth has been reached. No separate action is required.

[0066] Further, movement of the stop element 40 from the second state to the first state may produce a clicking or other audible signal indicating that the desired implantation depth has been reached. This facilitates the use of the kit, in particular to determine whether the desired implantation depth has been reached.

[0067] Also, it can easily be seen by the user whether the stop element 40 is positioned in the groove 24, as the movement from the second state to the first state results in a substantial diameter change of the stop element 40. This can for example be seen by comparison of the difference in diameter of the stop element 40 with the diameter of the stop surface 12 of FIGS. 6 and 7.

[0068] Another important advantage of the stop element 40 moving into the groove is that the dental implant cannot be moved substantially further into the jaw 50 since the stop element 40 positioned in the groove 24 will prevent further movement of the implant guide 20 in the implantation direction B.

[0069] It is remarked that, in practice, the shape and the material of the template 10 may have some flexibility which can result in a dental implant being moved too far into the bore hole 50 since the template 10 bends somewhat in the implantation direction B as a result of the forces exerted on the template 10 during screwing of the dental implant 30 into the jaw 50.

[0070] To determine more accurately whether the dental implant 30 is positioned at the desired implantation depth, the stop element 40 is provided, in its first, relaxed, state with a diameter, i.e. the distance between the first part 41 and the second part 42, which is larger than the diameter of groove bottom 25. This results in some play between the stop element 40 and the groove 24 when the stop element 40 is positioned in the groove 24.

[0071] When the implant guide 20 and the dental implant 30 are moved too far into the jaw 50, the stop element 40 will be clamped between the stop surface 12 and the proximal groove side of the groove 24, and, as a result, the stop element 40 will no longer have some play. The presence of play can easily be determined by the user, for example by pushing against one of the first and second extension parts 44, 45.

[0072] When the stop element 40 has moved into the groove 24, the user may push against one of the first and second extension parts 44, 45. When the stop element 40 will somewhat move, this indicates that the dental implant is positioned at the desired implantation depth. When no movement of the stop element 40 in the groove 24 is possible, the dental implant has been moved too far into the bore hole 51, for example due to flexing of the template 10. By screwing the dental implant 30 slowly in the reverse direction such that it moves out of the bore hole 51 until some play can be determined between the stop element 40 and the groove 25, the dental implant 30 can be moved back to the desired implantation depth.

[0073] Hereinabove an embodiment of a kit for use in the implantation of a dental implant in a jaw has been described. However other embodiments of the parts such as the stop element 40 may also be contemplated.