Multiple bite configurations

Abstract

A method of digitally designing a dental component for a patient, wherein the method includes: obtaining a 3D representation of the patient's upper jaw; obtaining a 3D representation of the patient's lower jaw; obtaining at least a first 3D representation of a first bite configuration of the patient's jaws in a first occlusion and a second 3D representation of a second bite configuration of the patient's jaws in a second occlusion different from the first occlusion; digitally determining a occlusal contact movement of the patient's jaws relative to each other based on the at least first 3D representation, the second 3D representation and contact between the patient's upper jaw and lower jaw; and digitally designing the dental component based on the occlusal contact movement of the patient's jaw relative to each other.

Claims

1. A method of designing a dental restoration or an orthodontic appliance for a patient, wherein the method comprises: obtaining a 3D representation of the patient's upper jaw using an intra-oral scanner; obtaining a 3D representation of the patient's lower jaw using the intra-oral scanner; obtaining a consecutive sequence of at least a first 3D representation of a first bite configuration of the patient's jaws in a first occlusion and a second 3D representation of a second bite configuration of the patient's jaws in a second occlusion different from the first occlusion by recording an occlusal contact movement of the patient using the intral-oral scanner while the patient is moving the jaws in the occlusal contact movement; digitally obtaining an alignment sequence of the upper jaw and the lower jaw by aligning the 3D representation of the 3D representation of the upper jaw and the 3D representation of the lower jaw in the consecutive sequence by using the respective first and second 3D representations of the first and second bite configurations; digitally determining the occlusal contact movement of the patient's upper jaw and lower jaw relative to each; and digitally designing the dental restoration or the orthodontic appliance based on the occlusal contact movement of the patient's upper jaw and lower jaw relative to each other.

2. The method according to claim 1, wherein the occlusal contact movement defines a reference which is used as a design guide when designing the dental component.

3. The method according to claim 2, wherein the at least one contact surface is provided between the dental component and the reference.

4. The method according to claim 2, wherein the occlusal contact movement defines a trace surface which as a design guide when designing the dental component.

5. The method according to claim 4, wherein the trace surface is used as a cutting plane for trimming the dental component.

6. The method according to claim 4, wherein at least a part of the dental component is snapped to the trace surface.

7. The method according to claim 1, wherein digitally designing the dental restoration or the orthodontic appliance comprises using the occlusal contact movement to design the dental restoration of the orthodontic appliance.

8. A system for designing a dental restoration or an orthodontic appliance for a patient, wherein the system comprises: means for obtaining a 3D representation of the patient's upper jaw using an intra-oral scanner; means for obtaining a 3D representation of the patient's lower jaw using an intra-oral scanner; means for obtaining a consecutive sequence of at least a first 3D representation of a first bite configuration of the patient's jaws in a first occlusion and a second 3D representation of a second bite configuration of the patient's jaws in a second occlusion different from the first occlusion by recording an occlusal contact movement of the patient using the intra-oral scanner while the patient is moving the jaws in the occlusal contact movement; means for digitally obtaining an alignment sequence of the upper jaw and the lower jaw by aligning the 3D representation of the 3D representation of the upper jaw and the 3D representation of the lower jaw in the consecutive sequence by using the respective first and second 3D representations of the first and second bite configurations; means for digitally determining the occlusal contact movement of the patient's upper jaw and lower jaw relative to each other; and means for digitally designing the dental restoration or the orthodontic appliance based on the occlusal contact movement of the patient's upper jaw and lower jaw relative to each other.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above and/or additional objects, features and advantages of the present invention, will be further elucidated by the following illustrative and non-limiting detailed description of embodiments of the present invention, with reference to the appended drawings, wherein:

(2) FIG. 1 shows an example of a flowchart of a method of digitally designing a dental component for a patient.

(3) FIG. 2 shows examples of different bite configurations.

(4) FIG. 3 shows an embodiment of the invention wherein the occlusal contact movement is determined by using interpolation.

(5) FIGS. 4 and 5 illustrates further how to correct for tooth collision and gaps during interpolation in one embodiment of the invention.

(6) FIG. 6 shows an embodiment of how the occlusal contact motion is used to design a dental component, such as a restoration.

DETAILED DESCRIPTION

(7) In the following description, reference is made to the accompanying figures, which show by way of illustration how the invention may be practiced.

(8) FIG. 1 shows an example of a flowchart of a method of digitally designing a dental component for a patient.

(9) In step 101 a 3D representation of the patient's upper jaw is obtained.

(10) In step 102 a 3D representation of the patient's lower jaw is obtained.

(11) In step 103 at least a first 3D representation of a first bite configuration of the patient's jaws and a second 3D representation of a second bite configuration of the patient's jaws are obtained.

(12) In step 104 occlusal contact movement of the patient's jaws relative to each other is digitally determined based on the at least first 3D representation and second 3D representation.

(13) In step 105 the dental component is digitally designed based on the occlusal contact movement of the patient's jaw relative to each other.

(14) FIG. 2 shows examples of different bite configurations.

(15) FIG. 2a) shows a bite configuration 200 where the patient's upper jaw 201 and lower jaw 202 are in static occlusion.

(16) FIG. 2b) shows a bite configuration 200 where the canine 203 in the right side of the patient's upper jaw 201 is in contact with the canine 204 in the right side of the patient's lower jaw 202.

(17) FIG. 2c) shows a bite configuration 200 where the incisal edge 205 of anterior teeth 206 in the upper jaw 201 is in contact with the incisal edge 207 of the anterior teeth 208 in the lower jaw 202.

(18) FIG. 2d) shows a bite configuration 200 with a furthest protrusion and some laterotrusion of the jaws 201, 202.

(19) FIG. 2e) shows a bite configuration 200 also with a furthest protrusion and some laterotrusion of the jaws 201, 202, but where the laterotrusion is different from FIG. 2d).

(20) FIG. 2f) shows a bite configuration 200 with strong retrusion of the jaws 201, 202.

(21) FIG. 3 shows schematically an embodiment where five 3D representations of different bite configurations 300, 301, 302, 303, 304 in respective occlusions have been obtained and the movement of the patient's jaws relative to each other is determined by interpolation between these.

(22) Keep in mind, in particular when reading the description with respect to FIGS. 3, 4 and 5, that when discussing movement direction, in particular right and left, it is with respect to the patient. However, the images are presented as an observer facing the patient. Accordingly, what is left for the patient will be right for the observer and vice versa.

(23) The movement determined in this embodiment is the natural chewing movement of the patient. Although a higher number of bite configurations will allow for the movement to be determined with higher accuracy to the natural movement it is possible to obtain it reasonably with as few as five bite configurations.

(24) The bite configuration where the maxilla 310 and the mandible 311 are in centric occlusion 300 is obtained. This is the natural bite of the patient. Typically, this is also the position where the teeth are in maximal occlusal contact.

(25) The sideward movement of the jaw when in occlusion can be determined by using the centric occlusion together with a left sideward bite configuration 302 wherein the mandible of the patient is moved to the left and a right sideward bite configuration 301 wherein the mandible of the patient is moved to the right.

(26) The sideward movement is then determined by interpolating between the right sideward bite configuration 301 and the central occlusion 300, and between the central occlusion 300 and the left sideward bite configuration 302.

(27) The interpolation may be linear; however, typically the movement of the dental arches defines a curved movement. Accordingly, the sideward movement may be determined by interpolating along a curved sideward line 305. The interpolation paths/curves 305, 308, 312 preferably define an average movement derived from typical jaw movements of patients.

(28) As the system interpolates it may check for occlusal contact between the teeth of the mandible and the maxilla. If the system finds that the teeth of the maxilla and mandible would overlap if moved along the sideward line then it open the jaws so that the teeth maintain contact but do no overlap. Similarly, if the system finds that there are no contacts between the teeth, e.g. the jaw is open, it would close the maxilla and the mandible together until contact occurs. This will be illustrated further in FIGS. 4a-4c and 5a-5c.

(29) The opening and closing of the jaws may be a linear movement, however, it may also be a rotation around a default axis. The default axis can be set as default by the computer, set by the user or determined otherwise.

(30) Thus, as the system interpolates between the bite configurations along curved sideward line 305 while maintaining occlusal contact the sideward movement 306 is determined.

(31) In a similar manner the retrusion 307, which is the backwards movement from the centric occlusion to a back bite configuration 303 where the mandible is retracted can be determined by interpolating as described above along a retrusion curve 308.

(32) And in yet another similar fashion the protrusion 309, which is the forward motion of the mandible relative to maxilla from the centric occlusion to a front bite configuration 304 can also be determined by interpolating as described along a protrusion curve 312.

(33) As can be understood the determined occlusal movements, whether it be laterial, retrusive or protrusive, may deviate from the interpolation lines. However, they will go through the respective points representing each 3D representation of a bite configuration since these are well known position.

(34) For improved accuracy further 3D representations of bite configurations may be obtained, which also has been mentioned earlier.

(35) With respect to FIGS. 4 and 5 it will be even further discussed how the method takes overlaps and gaps into consideration during interpolation.

(36) FIG. 4a show the 3D representation of a bite configuration where the 3D representation of the patient's upper jaw 310 and the 3D representation of the patient's lower jaw 311 are in centric occlusion 300.

(37) FIG. 4b shows the actual patient specific movement, where the lower jaw 311 is moved in a right lateral direction as indicated by the arrow. FIG. 4b shows a configuration of the upper and lower jaw during lateral movement between the central occlusion and the right sideward bite configuration 301. The movement is done while keeping at least one contact point between the teeth of the upper and lower jaw. The contact points may not necessarily be present in the shown cross-section, but may occur between other teeth in the first 3D teeth model. However, in the current case a contact point 350 is present between two molars 337 and 327.

(38) Subsequently the lower jaw 311 is moved in the left lateral direction from the centric occlusion 300 as shown in FIG. 4c toward the left sideward bite configuration 302. Similar to FIG. 4b FIG. 4c shows a relative position of the upper and lower jaw where a contact point 351 is present between the two molars 317 and 347.

(39) FIGS. 4a, 4b and 4c shows representative relative positions of the upper and lower jaw during the actual patient specific movement. Other such sectioning views could be made in other areas at other points during the lateral movement or even during other movement, such as protrusion or retrusion.

(40) However, as will be shown in FIGS. 5a, 5b and 5c correction may be necessary when determining the patient specific movement, i.e. the occlusal contact movement, using interpolation.

(41) FIG. 5a shows the bite configuration wherein the upper and lower jaw are in centric occlusion 300. This is identical to FIG. 4a as it was recorded in that position.

(42) However, when interpolating between the centric occlusion bite configuration and the right sideward bite configuration 301 an overlap 352 is detected between at the molars 327 and 337, as shown in FIG. 5b which corresponds to the position shown in FIG. 4b. Accordingly in order to compensate for this the jaws are moved apart until the overlapping area is gone, but only so far that an occlusal contact still exists.

(43) Similarly as shown in FIG. 5c, which corresponds to the position in FIG. 4c, the interpolation results in no contact being present between the upper and lower jaw. Accordingly, the jaws are moved together until occlusal contact is obtained, although not as far so that the 3D representations overlap.

(44) With respect to FIG. 6 it is described how the occlusal contact movement can be used to design the dental component. A trace surface 600 is generated by tracing the cusps of a tooth 601 of the first 3D teeth model as it follows the occlusal contact movement 602.

(45) The trace surface can then be used as a reference for designing the dental component. For example the trace surface 600 may be used as a cutting surface for cutting the dental component if it penetrates the trace surface and thus would block the actual patient specific occlusal contact movement to be performed by the patient.

(46) Although shown only using one tooth 601 in FIG. 5, the trace surface is typically a sum of the trace lines or surfaces of each tooth in the respective jaws.

(47) Although some embodiments have been described and shown in detail, the invention is not restricted to them, but may also be embodied in other ways within the scope of the subject matter defined in the following claims. In particular, it is to be understood that other embodiments may be utilised and structural and functional modifications may be made without departing from the scope of the present invention.

(48) In device claims enumerating several means, several of these means can be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims or described in different embodiments does not indicate that a combination of these measures cannot be used to advantage.

(49) A claim may refer to any of the preceding claims, and “any” is understood to mean “any one or more” of the preceding claims.

(50) It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

(51) The features of the method described above and in the following may be implemented in software and carried out on a data processing system or other processing means caused by the execution of computer-executable instructions. The instructions may be program code means loaded in a memory, such as a RAM, from a storage medium or from another computer via a computer network. Alternatively, the described features may be implemented by hardwired circuitry instead of software or in combination with software.

Embodiments

(52) The following sequence of embodiment should not be read limiting for the invention, but should be seen as a sequence of advantageous embodiments and examples.

(53) 1. A method of designing a dental component for a patient, wherein the method comprises: obtaining a 3D representation of the patient's upper jaw; obtaining a 3D representation of the patient's lower jaw; obtaining at least a first 3D representation of a first bite configuration of the patient's jaws in a first occlusion and a second 3D representation of a second bite configuration of the patient's jaws in a second occlusion different from the first occlusion; digitally determining a occlusal contact movement of the patient's jaws relative to each other based on the at least first 3D representation, the second 3D representation and contact between the patient's upper jaw and lower jaw; and digitally designing the dental component based on the occlusal contact movement of the patient's jaw relative to each other.

(54) 2. A method according to embodiment 1, wherein digitally determining the occlusal contact movement comprises a consecutive sequence of at least two 3D representations of bite configurations of the patient's jaws in respective occlusions.

(55) 3. The method according to claim 2, wherein the method further comprises obtaining the consecutive sequence of at least two 3D representations of bite configurations of the patient's jaws in respective occlusions using an intra-oral scanner.

(56) 4. The method according to claim 2 or 3, wherein the method further comprises that the 3D representations of bite configurations are recorded as a consecutive sequence of frames.

(57) 5. The method according to embodiment 2, 3 or 4, wherein the method comprises obtaining a plurality of 3D representations of bite configurations of the patient's jaw, and where the 3D representations are adapted to be played as a video stream.

(58) 6. A method according to embodiment 1, wherein digitally determining the occlusal contact movement of the patient's jaws relative to each other comprises interpolating the movement between the measured bite configurations.

(59) 7. The method according to embodiment 6, wherein digitally determining occlusal contact movement of the patient's jaws relative to each other comprises interpolating the movement between the measured bite configurations.

(60) 8. The method according to embodiment 6 or 7, wherein the interpolation comprises performing a rigid transformation.

(61) 9. The method according to embodiment 6, 7 or 8, wherein the interpolation comprises performing a linear transformation.

(62) 10. The method according to embodiment 6, 7 or 8, wherein the interpolation comprises performing a non-linear transformation.

(63) 11. The method according to embodiment 6, 7 or 8, wherein the interpolation is a combination of linear and non-linear transformations.

(64) 12. The method according to any one of the embodiments 6-11, wherein the transformation comprises translation and rotation.

(65) 13. The method according to any one of the embodiments 6-12, wherein the interpolation is performed with regard to teeth present within the range of known data points from at least the first and the second bite configurations.

(66) 14. The method according to any one of the embodiments 6-13, wherein the method further comprises detecting overlapping areas of the teeth of the 3D representation of the patient's upper jaw and the 3D representation of the patient's lower jaw during interpolation, and moving the 3D representation of the patient's upper jaw and the 3D representation of the patient's lower jaw apart until no overlapping areas are detected.

(67) 15. The method according to any one of the embodiments 1-14, wherein the method further comprises obtaining a third 3D representation of a third bite configuration of the patient's jaws.

(68) 16. The method according to any one of the embodiments 1-15, wherein the method comprises digitally aligning at least the 3D representation of the upper jaw, the 3D representation of the lower jaw, the first 3D representation of the first bite configuration and the second 3D representation of the second bite configuration.

(69) 17. The method according to any one of the embodiments 1-16, wherein the occlusal contact movement of the patient's jaws comprise: protrusion; retrusion; laterotrusion; latero-re surtrusion; mediotrusion; and/or immediate side shift.

(70) 18. The method according to any one of the embodiments 1-17, wherein determining the occlusal contact movement of the patient's jaws comprises determining the extreme positions of the movements of the jaws.

(71) 19. The method according to any one of the embodiments 1-18, wherein at least one of the 3D representations provides constraints for the occlusal contact movement of the patient's jaws.

(72) 20. The method according to any one of the embodiments 1-19, wherein the method comprises indicating which movements of the jaws which are due to recorded bite configurations and which movements of the jaws that are due to the determined occlusal contact movement.

(73) 21. The method according to any one of the claims 1-20, wherein the occlusal contact motion is played in the order it was determined.

(74) 22. The method according to any one of the embodiments 1-21, wherein the bite configurations comprise: a closed bite with contact between at least some of the upper and lower teeth; a wry/skew bite to the left side; a wry/skew bite to the right side and/or a bite where teeth and jaws are in static occlusion.

(75) 23. The method according to any one of the embodiments 1-22, wherein the bite configurations comprise one or more interocclusal records, where the interocclusal records comprise: centric relation and/or maximum intercuspation; right lateral; left lateral; and/or protrusive.

(76) 24. The method according to any one of the embodiments 1-23, wherein at least one of the bite configurations comprises an extreme position of the movements of the jaws.

(77) 25. The method according to any one of the embodiments 1-24, wherein the bite configurations comprise: the maximum laterotrusion; the maximum mediotrusion; the maximum immediate side shift; the maximum latero-re-surtrusion; the maximum protrusion of the patient; and/or the maximum retrusion of the patient.

(78) 26. The method according to any one of the embodiments 1-25, wherein the dental component is designed for the patient based on the determined occlusal contact movement of the patient's jaws.

(79) 27. The method according to any one of the embodiments 1-26, wherein the method comprises that during designing of the dental component an operator has the option to shift between viewing/visualizing the articulations/movements of the jaws which are due to recorded bite configurations.

(80) 28. The method according to any one of the embodiments 1-27, wherein the dental component is a dental restoration or an orthodontics appliance.

(81) 29. The method according to any one of the embodiments 1-28, wherein the dental restoration is a crown, an abutment, a bridge, a full denture, a partial removable denture, an inlay, an onlay etc.

(82) 30. The method according to any one of the embodiments 1-29, wherein the orthodontic appliance is a brace, an aligner, a retainer etc.

(83) 31. The method according to any one of the embodiments 1-30, wherein the 3D representations are obtained by means of scanning the patient's teeth intra-orally and/or by means of scanning physical impressions of the patient's teeth and/or by means of scanning physical models of the patient's teeth.

(84) 32. The method according to any one of the embodiments 1-31, wherein the 3D representation is obtained by means of obtaining a 3D scan.

(85) 33. The method according to any one of the embodiments 1-32, wherein the 3D scan is an intra oral scan of at least part of the patient's set of teeth, a scan of at least part of an impression of the patient's set of teeth, and/or a scan of at least part of a physical model of the patient's set of teeth.

(86) 34. The method according to any one of the embodiments 1-33, wherein the 3D scan is performed by means of laser light scanning, LED scanning, white light scanning, fluorescence scanning, probe-scanning, X-ray scanning, and/or CT scanning.

(87) 35. The method according to any one of the claims 1-34, wherein the occlusal contact motion defines a reference which is used as a design guide when designing the dental component.

(88) 36. The method according to claim 35, wherein the at least one contact surface is provided between the dental component and the reference

(89) 37. The method according to claim 35 or 36, wherein the occlusal contact motion defines a trace surface which as a design guide when designing the dental component.

(90) 38. The method according to claim 37, wherein the trace surface is used as a cutting plane for trimming the dental component.

(91) 39. The method according to claim 37, wherein at least a part of the dental component is snapped to the trace surface.

(92) 40. A computer program product comprising program code means for causing a data processing system to perform the method of any one of the preceding claims, when said program code means are executed on the data processing system.

(93) 41. A computer program product according to the previous embodiment, comprising a computer-readable medium having stored there on the program code means.

(94) 42. A nontransitory computer readable medium storing thereon a computer program, where said computer program is configured for causing computer-assisted digitally designing of a dental component for a patient by performing the method of any one or more of the preceding claims.

(95) 43. A system for designing a dental component for a patient, wherein the system comprises: means for obtaining a 3D representation of the patient's upper jaw; means for obtaining a 3D representation of the patient's lower jaw; means for obtaining at least a first 3D representation of a first bite configuration of the patient's jaws in a first occlusion and a second 3D representation of a second bite configuration of the patient's jaws in a second occlusion different from the first occlusion; means for digitally determining a occlusal contact movement of the patient's jaws relative to each other based on the at least first 3D representation, the second 3D representation and contact between the patient's upper jaw and lower jaw; and means for digitally designing the dental component based on the occlusal contact movement of the patient's jaw relative to each other.