Source: https://patents.google.com/patent/US9011147
Timestamp: 2018-04-25 14:51:37
Document Index: 111912291

Matched Legal Cases: ['art 5', 'art 6', 'art 6', 'art 5', 'art 5', 'art 6', 'Application No. 2010209671', 'Application No. 2', 'Application No. 201080014124', 'Application No. 2011', 'Application No. 2011', 'Application No. 2011136473']

US9011147B2 - Dentist tool - Google Patents
Dentist tool Download PDF
US9011147B2
US9011147B2 US13524383 US201213524383A US9011147B2 US 9011147 B2 US9011147 B2 US 9011147B2 US 13524383 US13524383 US 13524383 US 201213524383 A US201213524383 A US 201213524383A US 9011147 B2 US9011147 B2 US 9011147B2
US13524383
US20120270176A1 (en )
Evelyne JACQUEMYNS
Viax Dental Technologies LLC
Viax Dental Technologies, LLC
A method for producing a dentist tool for use in removing tooth structure is provided. The method includes acquiring three-dimensional data relating to a shape of a tooth and part of a neighboring tooth. The method includes processing the data to determine an overlay fitting the tooth and part of the neighboring tooth. The method further includes processing the data to determine the tooth structure to be removed from the tooth to prepare the tooth for further treatment. The method includes determining first and second guiding edges such that the two edges are spaced apart a distance of at least 0.5 mm and configured to enable a dentist cutting tool to be guided by simultaneously contacting the first and second guiding edges to enable a guided removal of at least partially the predetermined part of tooth structure. The method includes producing the determined overlay having the determined guiding edges.
The present application is a continuation of U.S. patent application Ser. No. 12/364,216, filed Feb. 2, 2009, the disclosure of which is incorporated herein by reference.
The present invention concerns a method for producing a dentist tool formed by an overlay to be used by a dentist in removing tooth structure, said method comprising the steps of:
acquiring three-dimensional data relating to a shape of at least one predetermined tooth and at least a part of a neighbouring tooth of said predetermined tooth;
determining guiding means within said overlay, suitable for guiding a dentist cutting tool;
producing said determined overlay having said determined guiding means.
The present invention further concerns a dentist tool obtained by the application of the described method.
When a patient needs a crown, bridge, onlay, inlay, veneer, or other restoring and/or aesthetic tooth treatment, conventionally, during an initial office visit, the dentist identifies the needs of the patient and determines an appropriate treatment. During subsequent visits, in case the tooth comprises damaged and/or infected tooth structure, the dentist removes this tooth structure and reconstructs the tooth as much as possible using conventional techniques. Thereafter, the dentist performs the final preparation of the tooth for further treatment by removing tooth material, which is to be interpreted as original tooth structure and reconstructed tooth structure, with a dental cutting tool such as a high-speed drill. Relying upon eyesight and expertise, the dentist uses the drill to shape the tooth in a form that is suitable for further treatment, in particular a form onto which a crown, bridge, onlay, inlay, veneer or other tooth restoring part can be mounted. Then, the dentist takes an impression of the dental arch in which the prepared tooth is located, and sends the impression to the dental laboratory to have the dental technician make the restoration part. Using the impression of the prepared tooth, the dental technician produces a restoration part that matches the colour, geometrical and material specifications, and sends it to the dentist. At the patient's final visit, the dentist adjusts the restoration part as necessary before fitting it in place.
Such a dentist tool is disclosed in EP1547544. The known dentist tool decreases the impact of the experience and expertise of the dentist onto the treatment, and it is used by a dentist in boring an artificial tooth root cavity. In EP1547544, guiding means, formed by a cylindrical hole, for guiding a drill in a straight-forward way, is provided. In such a manner an artificial tooth root cavity can be bored with greater precision even by a less experienced dentist. Moreover a suitable root cavity position can be calculated based on the information processed by the computer, so as to form in the most optimal way a cavity in the jaw bone.
It is an object of the present invention to provide method for producing a dentist tool that is suitable for being used by a dentist in preparing a tooth for further treatment.
To this end, a dentist tool according to the present invention is characterized in that said method comprises the further steps of:
before determining said guiding means, determining a predetermined part of tooth structure to be removed from said tooth so as to prepare said tooth for further treatment;
determining at least two guiding edges of which a first and a second guiding edge are spaced apart from each other by a distance of at least 0.5 mm, said guiding edges being part of said guiding means (7), said guiding edges being configured so as to enable said dentist cutting tool to be guided by simultaneously contacting said first and said second guiding edge in such a manner as to enable a guided removal of at least partially said predetermined part of tooth structure.
The determination of a predetermined part of tooth structure to be removed results in that this does not any more depend on the skills of the dentist. Depending on the individual dental situation of a patient, the computer is programmed to determine an optimal way for shaping the tooth into a shape that is suitable for further treatment. Determining and producing guiding edges into an overlay, which guiding edges are suitable for simultaneously contacting the dentist cutting tool, allows the cutting tool to be guided along a well determined path in an at least partially predetermined way. The overlay, having the guiding edges, accurately indicates onto the tooth the part to be removed from the tooth as determined by the computer. Moreover the tool according to the invention is provided to assist the dentist in removing tooth structure as the tool allows a dentist to remove at least part of a predetermined part of tooth structure.
Preferably, in determining said guiding means, a guiding groove is determined, which defines a path extending in a surface of said overlay and suitable for guiding said dentist cutting tool along said path in such a manner as to enable a guided removal of at least partially said predetermined part of tooth structure.
The two guiding edges, being distanced from each other, can be located one on the one side and the other on the other side of the path thereby defining the path between the two guiding edges. To this purpose, the distance between the two guiding edges should be substantially equal to a diameter of the cutting tool. Using the dentist cutting tool by simultaneously contacting the two guiding edges and following the path allows a guidance of the cutting tool at least in two dimensions. Considering a longitudinal cutting tool, the surface defined by the two guiding edges in this configuration will be substantially perpendicular to the direction of the cutting tool in use.
determining a tooth restoration part having an inner shape so as to fit a remaining part of tooth structure of said tooth, and having an outer shape so as to fit together with remaining neighbouring teeth;
Preferably, said predetermined part is determined by:
firstly determining a tooth restoration part having an outer shape so as to fit together with remaining neighbouring teeth, and having an inner shape compatible with said outer shape;
In a further step, the determined tooth restoration part having the determined outer and inner shape, can be produced. This results in that less office visits are required, as the dentist can prepare the tooth and mount the tooth restoration part onto the prepared tooth in one single visit, having the advantageous as described above.
Preferably said removal of tooth structure is to be performed in a plurality of stages in which said guiding means is provided to guide said cutting tool in a first stage of said plurality of stages, and at least one further guiding means is provided to guide said cutting tool in at least one further stage, the method further comprising the steps of:
determining said at least one further guiding means (7) each comprising at least two further guiding edges of which a further first and a further second guiding edge are spaced apart from each other by a distance of at least 0.5 mm, said further first and said further second guiding edges being provided for simultaneously contacting said dentist cutting tool thereby guiding said dentist cutting tool in such a manner as to enable a guided removal of at least partially said predetermined part of tooth structure;
producing at least one further overlay each having one of said at least one further guiding means.
Producing a plurality of overlays instead of just one overlay provides a further flexibility in the method for producing the dentist tool. Different overlays can be provided for guiding a dentist cutting tool along different sides of the tooth to be prepared, so that for example a circumferential path can be defined by using multiple overlays each defining a different segment of the circumferential path. Multiple overlays furthermore allow to use different dental cutting tools, which is necessary in some cases. Different overlays can be provided for preparing a tooth in multiple stages, in which for example a first stage is provided to smoothen the upper part of the tooth, a second and a third stage are provided to cut away the longitudinal and transversal sides of the tooth, and a fourth and fifth stage are provided to round off the edges between the longitudinal and transversal sides each at a different side of the tooth. Preparing a tooth in stages allows each overlay to be designed having guiding edges which are particularly determined for guiding the cutting tool in a particular way characterised by the particular stage.
Several methods are known for acquiring three-dimensional data from a patient's dentition. Such data can be retrieved by processing photographs taken from the patient's dentition. Another method is making a physical impression of the dentition and then scanning this impression with a CAD/CAM 3D scanning device. For what concerns the present invention, any appropriate method for acquiring three-dimensional data can be used.
After acquiring the three-dimensional data of the tooth, this data gets processed by a computer so as to determine an overlay 1 fitting the teeth 2 of the patient. To this end, the inner shape of the overlay preferably corresponds to the outer shape of the tooth to be prepared and to the outer shape of at least part of a neighbouring tooth. Overlay should fit the teeth in such a manner that once the overlay is placed onto the teeth, it will only come off by applying a sufficiently high force to the overlay. During preparation of the tooth, small forces may be applied to the overlay, which preferably should not modify the position of the overlay on the teeth. Preferably, the overlay 1 extends over the teeth 2 so as to also cover part of the gingiva 3 for stability purpose and protection purpose. As the dentist will use the overlay 1 for removing tooth material, it is advantageous that the overlay 1 is located onto the tooth in a stable way. As an example, an overlay 1 closely fitting the tooth, two neighbouring teeth, and part of the gingiva 3, ensures that a dentist can arrange and maintain the overlay in a stable position during removal of tooth structure. When the overlay 1 covers a part of the gingiva 3, at least this part of the gingiva 3 will be protected during the process of removing tooth structure.
The determined overlay 1 has a thickness 4 that mainly depends on the required strength thereof, and thus also the material it will be made of. An overlay 1 according to the invention can have a constant overall thickness 4. A substantially constant overall thickness is preferred for an overlay to be used by a dentist in preparing a tooth or teeth for placing veneers. An overlay to be used for preparing a tooth for placing a bridge or a crown preferably comprises an upper, guiding part 5, and a lower, supporting part 6. The supporting part 6 of the overlay 1 will ensure that the overlay 1 can be arranged in a stable way onto the teeth 2, whereas the guiding part 5 of the overlay 1 will guide the dentist cutting tool and preferably will also determine the maximal penetration depth of the cutting tool in the tooth. To this end, the thickness of the guiding part 5 of the overlay 1 will preferably be determined case by case together with the determination of the guiding means 7, as will be explained further. The thickness 4 of the supporting part 6 of the overlay 1 can be more freely chosen depending on the preferences of the dentist and/or the programmation of the computer.
Determining the predetermined part depends on many parameters and will differ from case to case. Parameters are the location of the tooth in the mouth of the patient, amount and location of the damaged tooth structure, distance of the tooth to neighbouring teeth, etc. In a preferred embodiment, the computer will also take into account the different parts of the tooth such as the enamel, denting, pulp, cementum, etc. in determining the predetermined part.
According to the invention, the computer is programmed to determine the predetermined part of tooth structure to be removed without assistance of a dentist except for what concerns the input of the initial data of the tooth. However also according to the invention, the computer can be programmed to determine the predetermined part in cooperation with a dentist, where for example the dentist decides on some parameters. This cooperation can be established by visualizing data relating to the tooth onto a computer display and allowing the dentist at least to enter one parameter relating to the preparation of the tooth. Preferably a preview of the tooth is visualized onto the computer display together with a preview of a simulation of the prepared tooth, so as to allow a dentist to see the impact of chosen parameters onto the prepared tooth. The latter feature provides a larger degree of freedom to the dentist and allows a less experienced dentist to consult a more experienced dentist about a case, based on the data in the computer. In this manner, the method for producing a dentist tool according to the invention allows a less experienced dentist to decide on a further treatment and prepare a tooth for further treatment with a same quality as if he or she was an experienced dentist.
Once the predetermined part has been determined, guiding means can be determined. The purpose of the guiding means is to guide a dentist cutting tool, i.e. a drill, so that the cutting tool removes at least a part of the predetermined part. To this end, it will be understood that in some cases, the dimensions of the dentist cutting tool, such as the length, diameter, cross-sectional form, etc. will be determining for which movement is to be made with the cutting tool to remove a certain part of tooth structure. It will also be understood that in many cases, it will not be sufficient to make one single movement for removing all the predetermined part. Via computer calculation and/or simulation, one or more movements can be determined for removing the predetermined part of tooth structure. It is to be understood that a movement in this context does not only relates to a two-dimensional position, but relates to the movement of the cutting tool in all its aspects such as horizontal movement, vertical movement and tilt movement.
The guiding means according to the invention comprise at least two guiding edges 11, 12 (FIG. 3-6). Two of these guiding edges 11, 12 are spaced apart from each other with a distance d of at least 0.5 mm. The guiding edges 11, 12 are provided to simultaneously contact the cutting tool 10 thereby guiding the cutting tool 10 at least partially into a predetermined movement. It is to be understood in this context that a surface having a length and having a width which are at least 0.5 mm can be considered as the said at least two guiding edges 11, 12. Namely, the two outer edges of the surface are provided to simultaneously contact the cutting tool 10, and are spaced apart with a distance d of at least 0.5 mm.
Once the overlay 1 and the guiding means are determined, the determined overlay 1 having the determined guiding means can be produced. This can be done by any known means such as a CAD/CAM system, rapid prototyping or 3D printing. When multiple guiding means have been determined, multiple overlays 1 can be produced each comprising one or several guiding means.
1. Overlay for guiding a dental cutting tool to remove predetermined tooth structure from a tooth to be treated, the overlay comprising:
an inner surface having a shape and dimensions corresponding to an outer surface of the tooth to be treated so that the inner surface is releasably fixable to the tooth to be treated;
a first guiding edge extending through a thickness of the overlay including through the inner surface, the first guiding edge having a contour corresponding to horizontal, vertical, and tilt movements to be followed by a dental cutting tool; and
a second guiding edge extending through the thickness of the overlay including through the inner surface and spaced apart from the first guiding edge by a distance d, the second guiding edge having a contour corresponding to the horizontal, vertical, and tilt movements to be followed by the dental cutting tool.
2. The overlay of claim 1, wherein the inner surface has a shape and dimensions so that it is releasably fixable to at least a part of a neighboring tooth of the tooth.
3. The overlay of claim 1, wherein the inner surface has a shape and dimensions so that the inner surface is releasably fixable to at least parts of a plurality of neighboring teeth, the inner surface, when fixed to the neighboring teeth, surrounding and adequately contacting the teeth so that the overlay does not release or move upon application of pressure during guiding of the cutting tool in normal use of the overlay.
4. The overlay of claim 1, wherein the distance d is at least 0.5 mm.
5. The overlay of claim 1, wherein the first and the second guiding edges are spaced apart a fixed distance at corresponding contacting points along respective lengths of the first and the second guiding edges.
6. The overlay of claim 1, wherein the first and the second guiding edges are spaced apart a fixed distance for contacting the at least one dental cutting tool at corresponding contacting points of the first and the second guiding edges.
7. The overlay of claim 1, wherein the overlay is a monolithic, inseparable structure.
8. The overlay of claim 1, wherein the first and the second guiding edges extend in a horizontal direction such that when the dental cutting tool is located at least at one position between the first and the second guiding edges and is oriented vertically, the overlay guides the dental cutting tool to follow only a horizontal movement of the horizontal, vertical, and tilt movements.
9. The overlay of claim 1, wherein the first and the second guiding edges extend in a vertical direction such that when the dental cutting tool is located at least at one position between the first and the second guiding edges and is oriented horizontally, the overlay guides the dental cutting tool to follow only a vertical movement of the horizontal, vertical, and tilt movements.
10. A dental cutting tool comprising a configuration providing it with the capacity of engaging one or more guiding edges of the overlay of claim 1.
11. Set of overlays to be used for guiding at least one dental cutting tool in removing predetermined tooth structure from a tooth to be treated, the set of overlays comprising two or more of the following overlays:
a first overlay having a shape and dimensions for guiding at least one dental cutting tool to cut away at least a portion of an upper part of a tooth based on a desired height of remaining tooth structure after removal of the upper part of the tooth;
a second overlay having a shape and dimensions for guiding at least one dental cutting tool to cut away at least a portion of a longitudinal side of the tooth;
a third overlay having a shape and dimensions for guiding at least one dental cutting tool to cut away at least a portion of a transversal side of the tooth;
a fourth overlay having a shape and dimensions for guiding at least one dental cutting tool to round off edges between the longitudinal and the transversal sides of the tooth at one side of the tooth; and
a fifth overlay having a shape and dimensions for guiding at least one dental cutting tool to round off edges between the longitudinal and the transversal sides of the tooth at the other side of the tooth opposite the one side of the tooth,
wherein each of the overlays of the set of overlays has an inner surface having a shape and dimensions so that each of the overlays is releasably fixable to the tooth to be treated.
12. The set of overlays of claim 11, wherein the inner surface of at least one overlay of the set of overlays has a shape and dimensions so that the inner surface is releasably fixable to at least a part of a neighboring tooth of the tooth.
13. The set of overlays of claim 11, wherein the inner surface of at least one overlay of the set of overlays has a shape and dimensions so that the inner surface is releasably fixable to at least parts of a plurality of neighboring teeth, the inner surface, when fixed to the neighboring teeth, surrounding and adequately contacting the teeth so that the at least one overlay does not release or move upon application of pressure during guiding of the cutting tool in normal use of such overlay.
14. The set of overlays of claim 11, wherein at least one of the overlays has the first and the second guiding edges spaced apart a fixed distance for contacting the at least one dental cutting tool at corresponding contacting points of the first and the second guiding edges.
15. A dental cutting tool comprising a configuration providing it with the capacity of engaging one or more guiding edges of an overlay present in the set of overlays of claim 11.
16. System to be used by a dentist to remove predetermined tooth structure from a tooth to be treated, the system comprising:
a dental cutting tool; and
the set of overlays of claim 11.
17. The system of claim 16, wherein one or more overlays of the set of overlays comprises:
18. System to be used by a dentist to remove predetermined tooth structure from a tooth to be treated, the system comprising:
a first guiding edge extending through a thickness of the overlay including through the inner surface, the first guiding edge having a contour corresponding to horizontal, vertical, and tilt movements to be followed by the dental cutting tool; and
19. The system of claim 18, wherein a portion of the dental cutting tool has a thickness such that the dental cutting tool simultaneously contacts the first and the second guiding edges of the overlay as the dental cutting tool moves along a path defined by the first and the second guiding edges.
20. The system of claim 18, wherein the dental cutting tool comprises a cutting portion and a collar, at least one of the first and the second guiding edges of the overlay being configured to contact the collar so as to enable the dental cutting tool to be guided by the overlay with a predetermined depth.
21. The system of claim 18, wherein the inner surface of the overlay has a shape and dimensions so that it is releasably fixable to at least a part of a neighboring tooth of the tooth.
22. The system of claim 18, wherein the first and the second guiding edges are spaced apart a fixed distance at corresponding contacting points along respective lengths of the first and the second guiding edges.
23. The system of claim 18, wherein the first and the second guiding edges are spaced apart a fixed distance for contacting the at least one dental cutting tool at corresponding contacting points of the first and the second guiding edges.
24. The system of claim 18, wherein the overlay is a monolithic, inseparable structure.
25. The system of claim 18, wherein the first and the second guiding edges extend in a horizontal direction such that when the dental cutting tool is located at least at one position between the first and the second guiding edges and is oriented vertically, the overlay guides the dental cutting tool to follow only a horizontal movement of the horizontal, vertical, and tilt movements.
26. The system of claim 18, wherein the first and the second guiding edges extend in a vertical direction such that when the dental cutting tool is located at least at one position between the first and the second guiding edges and is oriented horizontally, the overlay guides the dental cutting tool to follow only a vertical movement of the horizontal, vertical, and tilt movements.
US13524383 2009-02-02 2012-06-15 Dentist tool Active 2029-03-30 US9011147B2 (en)
US12364216 US20100192375A1 (en) 2009-02-02 2009-02-02 Method for producing a dentist tool
US13524383 US9011147B2 (en) 2009-02-02 2012-06-15 Dentist tool
US14687110 US20150257853A1 (en) 2009-02-02 2015-04-15 Dentist tool
US12364216 Continuation US20100192375A1 (en) 2009-02-02 2009-02-02 Method for producing a dentist tool
US14687110 Continuation US20150257853A1 (en) 2009-02-02 2015-04-15 Dentist tool
US20120270176A1 true US20120270176A1 (en) 2012-10-25
US9011147B2 true US9011147B2 (en) 2015-04-21
ID=42396504
US12364216 Abandoned US20100192375A1 (en) 2009-02-02 2009-02-02 Method for producing a dentist tool
US13524383 Active 2029-03-30 US9011147B2 (en) 2009-02-02 2012-06-15 Dentist tool
US14687110 Pending US20150257853A1 (en) 2009-02-02 2015-04-15 Dentist tool
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