US 7,950,924 B2Grant
Arrangement and device for using a template to form holes for implants in bone, preferably jaw bone
Issue Date:2011-05-31
•16 Claims
•4 Drawing Sheets
Abstract
An apparatus includes a template which locates hole positions in a jawbone while the template is separated from the jawbone by gum tissue. The template follows a contour of the gum tissue surrounding the jawbone and has guide holes which receive a cutting tool. Anchoring elements attach the template to the jawbone. A system includes means for scanning an implantation site on a patient's jawbone, simulating the implantation site, and determining nerve-rich areas or nerve paths in the jawbone. A holed template is produced which is separated from the jawbone by at least gum tissue of the patient. Attachment hole positions in the jawbone are located so as to avoid nerve paths. A method of forming holes to attach a dental implant to a patient's jaw bone without surgical intervention in gum tissue of the patient to expose the jawbone is disclosed which avoids impingement on a nerve path.
Metadata
Assignee
- Nobel Biocare Services AG
Inventor
- Izidor Brajnovic
Application Information
Application Number:US 10/710,170
Filing Date:2004-06-23
Priority Date:2001-12-28
Art Unit:3732
Classifications
IPC:
A61C3/00
Patent Drawings (4 sheets)
Description
Cross Reference to Related Applications
[0001] This Application is a Continuation of Application PCT/SE02/02393 filed on Dec. 19, 2002. Application PCT/SE02/02393 claims priority to Application 0104431-2 filed on Dec. 28, 2001 in Sweden. The entire contents of each of PCT/SE02/02393 and SE 0104431-2 are incorporated herein by reference.
Background of the Invention
[0002] This disclosure relates in various aspects to an arrangement for using a template to form holes for implants in bone, preferably jaw bone, without any negative effect from the existing resiliency in the flesh surrounding the bone, for example the gum (gingiva). The template in question may be adapted to the shape or shapes of the bone and of the gum and has guide holes for a hole-forming unit which can consist of conventional drill equipment.
[0003] This disclosure also relates to a device in accordance with the above in which a holed template is arranged to be applied to an implantation site. The device in this case comprises one or more first apparatus arranged to scan the implantation site and initiate electronic, preferably digital, signals concerning the implantation site and send them to a computer processor. The processor may be arranged and operated to simulate the implantation site and the holed template which is adapted to the implantation site. The processor may be arranged to supply information on all or part of the simulated situation, and may also be arranged to forward or transmit the information to a second apparatus designed to cooperate with production equipment relating to the simulated holed template.
[0004] It has long been known to use templates to form holes in the jaw bone, for example. It is also known that it can be difficult to obtain the necessarily exact hole formation unless the gum, i.e. the gingiva, is folded back and the jaw bone thereby exposed, because the gum resilient properties can interfere with the template application and the hole formation.
[0005] There is a great disadvantage in carrying out surgical interventions for exposing the jaw bone, i.e. by folding back the gum. This causes inconveniences for the patient, and the implantation work is also painful because the formation of the hole and insertion of the implant have to be followed by a process of healing, which can last some considerable time.
[0006] What is needed then is an apparatus, system, and method to substantially shorten the time required for the implantation work. What is further needed is a system and method which uses computer-based scanning and production for the templates and the implantation process.
Summary of the Invention
[0007] In one embodiment, an arrangement includes a template designed for application to the bone (the jaw bone) with the gum (gingiva) lying in between, wherein the template is arranged with two or more anchoring elements intended to extend through the gum and into and preferably through substantial parts of the whole bone, the hole-forming unit being arranged to penetrate through the gum during hole formation in the bone (jaw bone).
[0008] In further aspects of this embodiment, the template is arranged to form holes for implants for anchoring a dental bridge with several implant attachments. The anchoring elements can have long and narrow or needle-shaped designs, and can be arranged to extend through side holes or side recesses in the side walls of the template. The anchoring elements for dental bridges are at least three in number, two of the anchoring elements being arranged on or at a distance from the ends of the bridge, and one or more anchoring elements are arranged at the central parts of the dental bridge. Each anchoring element may be arranged to extend substantially horizontally through the gum and the jaw bone. Alternatively, or in addition to this, the anchoring elements can extend only partially into the gum.
[0009] In an aspect of this embodiment, an apparatus useful in a dental implant procedure includes a template suitable for locating hole positions in a patient's jawbone with the template separated from the jawbone by at least gum tissue of the patient. The template may be shaped to follow a contour of the gum tissue surrounding the jawbone and having guide holes suitable for receiving a cutting tool. Plural anchoring elements are provided to attach the template to the jawbone.
[0010] In another embodiment, a system useful in a dental implant procedure includes means for scanning an implantation site on a patient's jawbone; means for simulating the implantation site; and means for determining nerve-rich areas or nerve paths in the jawbone. A production apparatus receives the simulated implantation site information and nerve-path information and produces a template suitable for locating attachment hole positions in the jawbone while the template is separated from the jawbone by at least gum tissue of the patient. The attachment hole positions in the jawbone are located so as to avoid the determined nerve paths in the jawbone.
[0011] In another aspect of this embodiment, a device includes a computer processor and necessary peripherals arranged to indicate a holed template shape for application to the bone, with the gum lying in between. The processor may be further arranged, with the aid of the information obtained from the first template, and/or user information sent to the computer equipment (in so-called interactive mode between the user and the computer appliance), and/or empirical information which can be gathered from a library, fact-containing member, etc., to execute a determination function so as to determine nerve-rich areas of the bone (jaw bone). The computer processor may be arranged to provide, in addition to data on the holed template shape, data concerning positions and extents for securing elements which are intended to extend through the gum and into and preferably through the whole bone (jaw bone), with account being taken of the routes of the nerve paths.
[0012] In another embodiment, a method of forming holes to attach a dental implant to a patient's jaw bone without surgical intervention in gum tissue of the patient to expose the jawbone includes scanning an implantation site on the patient's jawbone; simulating the implantation site; and determining nerve-rich areas or nerve paths in the jawbone. Implant hole and template attachment hole positions are planned at the implantation site on the jawbone responsive to simulated implantation site and determined nerve path information so as to avoid impingement on a nerve path. A template is produces which incorporates the planned implant hole and template attachment hole positions. The template is separated from the jawbone by at least the gum tissue. The template is attached to the jawbone with plural anchoring elements. One or more holes are cut or drilled in the jawbone through a corresponding implant hole position in the template.
Brief Description of the Drawings
[0013] An apparatus, system, and method according to various aspects of this disclosure will be described below with reference to the attached drawings, in which:
[0014] FIG. 1 shows, in block diagram form, a computer-based function for production of a holed template in connection with a patient, in which a scanning function is included and the scanning function is connected to a computer-based apparatus which-in turn is arranged to deliver information to production equipment for the template in question;
[0015] FIG. 2 shows, in horizontal view, a template applied to a jaw bone with the gum lying in between, and where securing elements for securing the template to a jaw bone are indicated;
[0016] FIG. 3 shows template, gum, and jaw bone in a vertical view;
[0017] FIG. 4 shows in perspective, obliquely from above right and from in front, the application of a template to a lower jaw bone;
[0018] FIG. 5 shows a rear view of the template and the jaw bone according to FIG. 4 ;
[0019] FIG. 6 shows, in perspective, the application of the template to an upper jaw; and
[0020] FIG. 7 shows the template application according to FIG. 6 from above.
Detailed Description
[0021] In FIG. 1 , an implant site in the form of or on a jaw bone is indicated diagrammatically by 1. The jaw bone is shown in a vertical view 1a, and in a horizontal view 1b. In this exemplary embodiment, the implant site or the jaw bone is to be provided with a dental bridge and in this example, all the teeth in the jaw bone in question are to be replaced by a dental bridge. The implant can be scanned with a scanning function, which can be an X-ray function, or computed tomography.
[0022] Alternatively, the scanning of the implant site can be done in an alternative way by conventional scanning, e.g., by a camera, etc. The scanning function in question is indicated diagrammatically by 2, and the scanning function or the scanning equipment is arranged to generate scanning-dependent signals in a conventional manner. The equipment comprises an apparatus 3 receiving the signals i1. This apparatus 3 is arranged to generate signals i1′, as a function of the signals i1, and send them to a computer-based appliance, e.g., a computer processor and associated peripheral equipment, which is symbolized by 4.
[0023] The computer appliance may be conventional, and may, for example, have the form of a PC. The term computer appliance must be seen here in its widest sense, in which the computer appliance includes peripherals such as screen 4a and keyboard 4b and is arranged with conventional memory elements and software. The computer appliance can operate with conventional software which is added to or is arranged in a memory or memory devices 5, for example. The computer appliance can also include or can be connected to receive further information which can be used in connection with template production, for example, applications in the form of computer library functions and/or empirical functions. Such a connection function is indicated by 6 in FIG. 1 .
[0024] The computer appliance is arranged to be able to simulate, for example, visually, the present implant situation as a function of the software. The appliance is also arranged to use the software to generate a template design which can be used for a particular implant situation. The generating of the design takes place in interaction with user 7 who, during the interaction, may use a visual computer screen 4a and a keyboard 4b , or voice control, or other known computer control techniques.
[0025] The simulation of the implant site and the suitable template produced for hole formation are transmitted in the form of digital signals i2 to a production site 8 for production of the model. The production site 8 can be arranged locally or at a remote point, and the information transfer can be done via the telecommunications and/or computer network which has been indicated by 9.
[0026] The production site 8 thus produces a template 10 which corresponds to the template simulated in the computer appliance. The template is provided with recesses or holes 12 guiding the hole-forming arrangement (drill) 11, with positions which correspond to the planned positions for the implants in the jaw bone. The template 10 is intended to be arranged on a jaw bone or equivalent 13 which is covered by gum 14. In accordance with the concept of the invention, the template is to be applied to the jaw bone 13 with the gum 14 lying in between.
[0027] The information i2 thus contains information concerning the template design. In addition, information i2 contains data on the positions and extents for securing elements which are intended to extend through the gum and into and preferably through the whole bone (jaw bone). In addition, information i2 contains data on the routes of nerve paths in connection with the bone/jaw bone.
[0028] In FIG. 2 , the template 10 is applied on the gum and the jaw bone. Information on applications of the implants from the computer appliance 4 (see FIG. 1 ) have resulted in drill hole positions having been established on the template 10. In the illustrative embodiment according to FIG. 2 , drill holes 15, 16, 17, 18 and 19 have been established. The application of the securing elements is arranged as a function of the hole and implant positions.
[0029] In a template 10 for a given dental bridge, for example, outer securing elements 20, 21 may be arranged to extend through the gum and the jaw bone at the ends 10a and 10b of the dental bridge and/or between the outermost and next to outermost fixtures in the dental bridge. The alternative or supplementary positions are indicated by broken lines 20a and 21a, respectively. Further securing elements 22, 23 extend through the gum and the bone at central parts 10c of the dental bridge. In accordance with the planning effected with the aid of the computer appliance 4 (see FIG. 1 ), the routes for the securing elements are arranged as a function of, or to avoid, the nerve paths which have been symbolized by 24, 25 in FIG. 2 . The securing elements preferably extend through the jaw bone in its main horizontal direction. The securing elements are indicated diagrammatically in FIG. 2 and have a long and narrow or needle-shaped design.
[0030] The purpose of the securing elements is that they may be firmly anchored to the bone/jaw bone. The resiliency of the gum lying in between must not affect the position of the template when the template has been anchored to the bone/jaw bone by means of the anchoring elements. The formation of the holes in the bone/jaw bone means that the gum must be penetrated by the hole-forming equipment (see 11 in FIG. 1 ). The number of securing elements can vary from case to case. In an illustrative embodiment which applies, for example, to dental bridges, at least three securing elements are used. Two of the securing elements are arranged at the bridge ends and/or between the outermost and next to outermost fixtures in the dental bridge. The alternative or supplementary positions are indicated by broken lines 20a and 21a respectively, and one or more securing elements are arranged at the central parts.
[0031] In FIG. 3 , the template is indicated by 10 and the bone or jaw bone by 13. The gum lying in between is indicated by 14. The template is provided with side recesses, two side recesses toward the front being shown by 26 and 27 in FIG. 3 .
[0032] In FIGS. 4 and 5 , a lower jaw is indicated by 28, and the main nerve path of the lower jaw (mental foramen) is indicated by 29. The surgical template is shown by 30 and its guide sleeves by 31. In accordance with the above, each securing element 32 can be inserted into a hole or a hole formation 33 which extends completely or partly through the template and the jaw bone, for example, in the horizontal direction. The elements have members 32a in the form of a head which determine the position of insertion.
[0033] In FIGS. 6 and 7 , the upper jaw 34 is shown from below with the applied template 35 and its guide members 36 for securing elements 37 which are provided with a head 37a. As is known, each jaw bone 28, 34 has underlying bone, and, in accordance with various aspects of this disclosure, gum 28a located on the latter in the embodiment according to FIGS. 4 and 5 does not have to be opened. As regards the structure of the bone and of the gum, such structure is believed to be known.
[0034] The embodiments of this disclosure are not limited to the embodiments described above by way of example, and instead it can be modified within the scope of the attached patent claims and the inventive concept.
Claims
The invention claimed is:
1. An apparatus for implanting a dental implant into a patient's jawbone, the apparatus comprising:
a template comprising a first wall, a first sidewall and a second sidewall that together define a channel configured to follow a contour of a patient's gum tissue surrounding the patient's jawbone, the template further comprising guide holes formed in the first wall and configured to receive a cutting tool for forming holes in the jawbone for receiving an implant, each guide hole defining an axis, the template further comprising at least one anchor hole that extends through the first sidewall, wherein the anchor hole is configured such that an anchoring element extending through the anchor hole is substantially perpendicular to the guide holes, extends through the gum tissue and into the jawbone, and is positioned between the axes defined by the guide holes for the dental implant while avoiding the nerve paths of the patient.
2. The apparatus of claim 1, wherein the template further comprises at least two anchoring elements, the at least two anchoring elements configured to extend through at least two anchor holes located in the first sidewall, wherein each of the at least two anchoring elements comprise a head portion and an essentially needle-shaped portion arranged to extend through the anchor holes, the head portion having a wider cross-sectional area than the essentially needle shaped portion.
3. The apparatus of claim 2, wherein one of the at least two anchoring elements is arranged at each end of the template, and one or more of the at least two anchoring elements are arranged at a central portion of the template.
4. The apparatus of claim 2, wherein the at least two anchoring elements comprise:
one or more first anchoring elements configured to extend completely through one of the sidewalls, the gum tissue, and the jawbone; and
one or more second anchoring elements configured to extend through one of the sidewalls, the gum tissue, and only partially into the jaw bone.
5. The apparatus of claim 2, wherein the at least two anchoring elements are at least three in number, and in that two of the anchoring elements are arranged between axes defined by an outermost and a second outermost guide hole of the template, and in that one or more anchoring elements are arranged at a central portion of the template.
6. The apparatus of claim 1, wherein the anchoring element comprises a head portion and an essentially needle-shaped portion arranged to extend through the anchor hole, the head portion having a wider cross-sectional area than the essentially needle shaped portion.
7. The apparatus of claim 6, wherein the anchoring element is arranged at an end of the template.
8. The apparatus of claim 6, wherein the anchoring element is arranged at a central portion of the template.
9. The apparatus of claim 6, wherein the anchoring element is configured to extend completely through one of the sidewalls, the gum tissue, and the jawbone.
10. The apparatus of claim 6, wherein the anchoring element is configured to extend through one of the sidewalls, the gum tissue, and only partially into the jaw bone.
11. The apparatus of claim 2, wherein the head portion of each of the at least two anchoring elements determines the depth of insertion of the corresponding anchoring element through the anchor hole.
12. An apparatus for implanting a dental implant into a patient's jawbone, the apparatus comprising:
a dental template comprising a first wall, a first sidewall and a second sidewall that together define a channel configured to follow a contour of a patient's gum tissue surrounding the patient's jawbone, the dental template further comprising guide holes formed in the first wall and configured to receive a cutting tool for forming holes in the jawbone for receiving an implant, the template further comprising at least one anchor hole that extends through the first sidewall, the anchor hole configured such that an anchoring element extending through the anchor hole is substantially perpendicular to the guide holes, and extends through the gum tissue and into the jawbone.
13. The apparatus of claim 12, wherein the template further comprises at least two anchoring elements, the at least two anchoring elements configured to extend through at least two anchor holes located in the first sidewall, wherein each of the at least two anchoring elements comprise a head portion and an essentially needle-shaped portion arranged to extend through the anchor holes, the head portion having a wider cross-sectional area than the essentially needle shaped portion.
14. The apparatus of claim 13, wherein one of the at least two anchoring elements is arranged at each end of the template, and one or more of the at least two anchoring elements are arranged at a central portion of the template.
15. The apparatus of claim 13, wherein the at least two anchoring elements are configured to extend through one of the sidewalls, the gum tissue, and only partially into the jaw bone.
16. The apparatus of claim 13, wherein the head portion of each of the at least two anchoring elements determines the depth of insertion of the corresponding anchoring element through the anchor hole.
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