METHOD FOR PERFORMING AN OPTICAL THREE-DIMENSIONAL RECORDING

Abstract

The invention relates to a method for performing an optical three-dimensional recording by using a hand-held dental camera, wherein the camera automatically records a plurality of individual optical recordings in succession at a defined frequency during the measurement, wherein the individual three-dimensional optical recordings are combined by means of registration into an overall recording of a dental object to be measured. Before the measurement is performed, a three-dimensional standard jaw model is displayed by means of a display device, wherein a first control point on the standard jaw model is displayed by means of the display device. The hand-held dental camera is then positioned in relation to the object to be recorded in such a way that the camera points at the first control point (10) of the standard jaw model and records a corresponding recording region of the dental object.

Claims

1. Method for performing an optical three-dimensional recording by using a hand-held dental camera, wherein the camera automatically records a plurality of individual optical recordings in succession at a defined frequency during the measurement, wherein the individual three-dimensional optical recordings are combined by means of a registration process into an overall recording of a dental subject to be measured, wherein a three-dimensional standard jaw model is displayed by means of a display device before the measurement is performed, wherein a first control point on the standard jaw model is displayed by means of the display device, wherein the hand-held dental camera is then positioned in relation to the object to be recorded in such a way that the camera points at the first control point of the standard jaw model and records a corresponding recording region of the dental subject.

2. Method according to claim 1, wherein the correctness of the position of the second control point is confirmed by a user action.

3. Method according to claim 2, wherein the user holds the dental camera steady relative to the subject on the first control point for a defined period of time until an acoustic, visual and/or haptic signal ensues as feedback.

4. Method according to claim 2, wherein the user confirms the first control point by actuating a button on the camera.

5. Method according to claim 2, wherein the user confirms the first control point by performing a gesture with the camera.

6. Method according to claim 2, wherein the user confirms the first control point by means of a voice command in that the voice command is recorded in an audio recording and recognized by means of voice recognition.

7. Method according to claim 2, wherein the user confirms the first control point by operating an input means, such as a mouse (13) or a keyboard (12).

8. Method according to claim 1, wherein the dental subject is a full upper jaw and/or lower jaw.

9. Method according to claim 1, wherein the first control point is arranged in the middle of an occlusal surface of a molar which is located on a left end or on a right end of the standard jaw model.

10. Method according to claim 1, wherein the user shifts and reestablishes the position of the defined first control point relative to the standard jaw model using an input means.

11. Method according to claim 1, whereinin addition to the first control pointa second control point is defined on an opposing end of the jaw as a subject and is displayed by means of the display device, wherein a first recording path is defined between the first control point and the second control point, which path is displayed on the standard jaw model by means of the display device.

12. Method according to claim 1, wherein an occlusal measurement is performed from an occlusal direction relative to the jaw as a subject, wherein the manually held dental camera is moved along the displayed first recording path until the second control point is reached.

13. Method according to claim 1, wherein the user confirms the correctness of the position of the second control point by a manual action.

14. Method according to claim 1, wherein a lingual or a palatal measurement of tooth surfaces of the upper jaw or of the lower jaw that lie in an oral direction as a subject is performed, wherein a third control point is defined on the opposing end of the jaw originating from the second control point, wherein a second recording path is defined between the second control point and the third control point and displayed by means of the display device, wherein the hand-held camera is then moved along the second recording path during the measurement, wherein the position of the third recording point is confirmed.

15. Method according to claim 1, wherein a buccal measurement is performed from a buccal direction, wherein in a first step a first buccal measurement is performed originating from a fourth control point on one end of the jaw arch to the middle of the jaw arch and furthermore to a fifth control point along a third recording path, wherein subsequently in a second step a second buccal measurement is performed originating from a sixth control point on an opposing end of the jaw arch to the middle of the jaw arch and furthermore to a seventh control point along a fourth recording path.

16. Method according to claim 15, wherein a first cluster from the first buccal measurement and a second cluster from the second buccal measurement are registered together using a shared overlapping area in the middle of the jaw arch.

17. Method according to claim 1, wherein at least one fringe recording sequence is performed in a buccal or labial direction perpendicular to a jaw curve of the jaw arch to be measured along a fifth recording path which is displayed by means of the display device prior to the measurement of this fringe recording sequence, wherein the clusters previously generated from the occlusal measurement, the lingual measurement and/or the buccal measurement are linked to one another, thereby improving the registration.

18. Method according to claim 1, wherein a bite block registration is performed, wherein a first three-dimensional model of the upper jaw is registered relative to a second three-dimensional model of the lower jaw, wherein a buccal recording sequence is measured in a bite block position along a seventh recording path which is displayed between the corresponding control points by means of the display device.

19. Method according to claim 1, wherein an actual recording path of the camera is determined which is formed by the projections of the centers of the individual recordings along a camera axis on a surface of the subject, wherein the actual recording path of the camera is displayed by means of the display device.

20. Method according to claim 19, wherein a deviation between the actual recording path and the planned recording path is determined during the measurement.

21. Method according to claim 20, whereinin the event that this deviation falls below a defined threshold valuean error message is displayed by means of the display device, whereupon the user is asked to continue the measurement at a new control point.

22. Method according to claim 1, wherein the standard jaw model in superposition with the previously registered individual recordings is pivoted, depending on a recording direction of the camera, in such a way that surfaces of the subject that are to be recorded are displayed, wherein the standard jaw model is displayed in the occlusal direction during the occlusal measurement, wherein the standard jaw model is pivoted such that the lingual surfaces to be recorded and the occlusal surfaces of the previously recorded teeth are visible during the lingual measurement, wherein the standard jaw model is pivoted such that the buccal surfaces to be recorded and the occlusal surfaces of the previously recorded teeth are visible during the buccal measurement.

23. Method according to claim 1, whereinwith the aid of a computerit is automatically determined in which areas the registered overall recording of the subject has gaps, wherein additional control points and/or additional recording paths are displayed in succession in these areas on the standard jaw model for user guidance.

24. Method according to claim 1, wherein specific areas of the subject which are to be completely measured, such as a preparation, can be defined on the standard jaw model, wherein it is checked with the aid of a computer whether these areas have been completely measured or whether they have gaps, whereinin the event that areas have gapsadditional control points and/or additional recording paths are displayed on the standard jaw model in order to measure these areas completely.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0076] The invention is explained with reference to the drawings. The figures depict the following:

[0077] FIG. 1 a sketch to illustrate the present method for performing an optical three-dimensional recording;

[0078] FIG. 2 a sketch of a standard jaw model of an upper jaw for an occlusal measurement;

[0079] FIG. 3 a sketch of a standard jaw model of an upper jaw for a lingual measurement;

[0080] FIG. 4 a sketch of a standard jaw model of an upper jaw for a first step of a buccal measurement;

[0081] FIG. 5 a sketch of a standard jaw model of an upper jaw for a second step of a buccal measurement;

[0082] FIG. 6 a sketch to illustrate a plurality of fringe recording sequences;

[0083] FIG. 7 a sketch to illustrate a linking of the different clusters;

[0084] FIG. 8 a sketch to illustrate a bite block registration.

EXEMPLARY EMBODIMENTS

[0085] FIG. 1 depicts a sketch to illustrate the present invention of an optical three-dimensional recording of a dental subject 1 to be measured, such as a bottom jaw, by means of a hand-held dental camera 2 which is pivoted around the dental subject 1 along a trajectory 3. The three-dimensional optical recordings 4, which are represented in the form of rectangles, are measured by means of the dental camera 2 which is pivoted along the trajectory 3 around the subject 1 during the measurement. The camera 2 is a hand-held camera which works using a fringe projection method. The recordings 4 are registered relative to one another using the overlapping areas 5 which are shown as dashed lines, thereby generating an overall recording of the object 1. Prior to the measurement being performed, a three-dimensional standard jaw model 7 is displayed by means of a display device 6 such as a monitor, which model corresponds in its measurements to an average jaw arch. In so doing, a first control point 10 is displayed on the standard jaw model of the lower jaw, bottom right, on the left end of the standard jaw model 7 in the middle of an occlusal surface 8 of the back molar 9 with the FDI number 38, bottom left. The control point 10 is represented schematically as a black circle. The user then moves the dental camera in the area of the molar 9 so that the camera records the first control point 10. The camera 2 is then held steady over the first control point for a defined period of time until an acoustic, visual and/or haptic signal ensues as a feedback and the position of the first control point is thereby confirmed. The first control point 10 can also be confirmed by operating a button 11 on the camera 2.

[0086] Alternatively, the control point 10 can also be confirmed by means of the input means, such as a keyboard 12 and a mouse 13, which are connected to a computer 14.

[0087] A second control point 15 and a first recording path 16 are displayed in addition to the first control point. The second control point is thereby arranged on the opposing end of the jaw arch on the back molar 17 with the FDI number 48. The recording path 16 thereby runs through the tooth centers 18 of the individual teeth 19 of the standard jaw model 7. The displayed recording path serves as a user guidance for the user in order to display which areas of subject 1 are to be measured.

[0088] For orientation, the standard jaw model 7 can be pivoted such that buccal surfaces 20 of a recording area 23 (which is shown as a dashed line) that are to be recorded are displayed in the foreground, wherein the previously measured occlusal surfaces of the subjects are also visible.

[0089] In this way, the line of sight on the standard jaw model 7 is changed during the measurement simultaneous with the movement of the camera 2 so that the user, such as the dentist, can orient himself more easily within the tooth situation.

[0090] FIG. 2 depicts a sketch of a standard jaw model 7 of an upper jaw, wherein the first recording path 16 originating from a first control point 10 (top right) on a first molar 30 with the FDI number 37 runs up to the second control point 15 on the opposing end of the jaw arch on the second molar 31 with the FDI number 47. The recording path 16 thereby runs through the tooth centers 18 of the individual teeth 19 of the standard jaw model 7. The dental camera 2 is therefore moved such that a center of the recordings 4 coincides with the recording path 16. In this way, an occlusal measurement is therefore carried out from the occlusal direction 21 of the top jaw.

[0091] FIG. 3 depicts a sketch to illustrate a lingual measurement of the upper jaw from a lingual or oral direction 40, which is represented by an arrow. The camera 2 is then positioned relative to the subject 1 in such a way that the recording from this direction 40 is facilitated, as indicated in FIG. 3. The lingual measurement is carried out along a second recording path 41 originating from the second control point 15 toward a third control point 42. Therefore, the inside tooth surfaces of the upper jaw are measured with the lingual measurement.

[0092] FIG. 4 depicts a sketch to illustrate a buccal measurement from a buccal direction 50, wherein a camera 2 is pivoted around the jaw in such a way that the buccal tooth surfaces 52 and the labial tooth surfaces 53 are measured. The teeth 54 are therefore not measured in the first step. The third recording path 51 thereby runs originating from a fourth control point 55 at the molar with the FDI number 37 across a middle 56 of the jaw arch up to a fifth control point 57. The position of the fourth control point 55 can thereby correspond to the position of the control point 42 and the control point 10.

[0093] FIG. 5 depicts a second buccal measurement originating from a sixth control point 60 across the middle 56 of the jaw arch to a seventh control point 61 along a fourth recording path 62. A first cluster from the first buccal measurement from FIG. 4 and a second cluster from the second buccal measurement from FIG. 5 are then registered relative to one another using a shared overlapping area 63 in the middle of the jaw arch.

[0094] FIG. 6 depicts a sketch to illustrate a first fringe recording sequence in buccal direction 70 perpendicular to a jaw curve 71 of the jaw arch to be measured along a fifth recording path 72 between the control points 73. The fifth recording path 72 thereby runs in the area of a molar with the FDI number 14. In addition, a second fringe recording sequence is performed in the labial direction 75 along a sixth recording path 74 in the area of the incisor with the FDI number 11, and a third fringe recording sequence is performed in the buccal direction 77 along the seventh recording path 76 in the area of the molar with the FDI number 24.

[0095] FIG. 7 depicts a sketch which is to illustrate that a first cluster 80 from the occlusal measurement in FIG. 2, a second cluster 81 from the lingual measurement in FIG. 3 and a third cluster 82 from the buccal direction in FIG. 4 and FIG. 5 are linked to each other by the fourth cluster 83 of the first fringe recording sequence from FIG. 6, as well as by the fifth cluster 84 of the second fringe recording sequence and the sixth cluster 85 of the third fringe recording sequence. The linkage points 86 are indicated by the crosses.

[0096] FIG. 8 depicts a sketch to illustrate a bite block registration, wherein a first three-dimensional model 90 of the upper jaw is registered relative to a second three-dimensional model 91 of the lower jaw. In this way, a first buccal recording sequence is performed along a recording path 92 between the control points 93 and 94, and a second buccal recording sequence is performed along the recording path 95 between a control point 96 and a control point 97. The first buccal recording sequence thereby runs in the area of the teeth with the FDI numbers 14 and 44. The second buccal recording sequence runs in the area of the teeth with the FDI numbers 24 and 34.

REFERENCE CHARACTERS

[0097] 1 Subject [0098] 2 Camera [0099] 3 Trajectory [0100] 4 Recording [0101] 5 Overlapping area [0102] 6 Display device [0103] 7 Standard jaw model [0104] 8 Occlusal surface [0105] 9 Molar [0106] 10 Control point [0107] 11 Button [0108] 12 Keyboard [0109] 13 Mouse [0110] 14 Computer [0111] 15 Second control point [0112] 16 First recording path [0113] 17 Back molar [0114] 18 Tooth centers [0115] 19 Teeth [0116] 20 Buccal surfaces [0117] 21 Occlusal direction [0118] 22 Buccal direction [0119] 23 Recording area [0120] 30 First molar [0121] 31 Second molar [0122] 40 Direction [0123] 41 Recording path [0124] 50 Buccal direction [0125] 51 Third recording path [0126] 52 Buccal tooth surface [0127] 53 Labial tooth surface [0128] 54 Teeth [0129] 55 Fourth control point [0130] 56 Middle [0131] 57 Fifth control point [0132] 60 Sixth control point [0133] 61 Seventh control point [0134] 62 Third recording path [0135] 63 Overlapping area [0136] 70 Direction [0137] 71 Jaw curve [0138] 72 Fifth recording path [0139] 73 Control point [0140] 74 Sixth recording path [0141] 75 Seventh recording path [0142] 76 Direction [0143] 80 First cluster [0144] 81 Second cluster [0145] 82 Third cluster [0146] 83 Fourth cluster [0147] 84 Fifth cluster [0148] 85 Sixth cluster [0149] 86 Linkage point [0150] 90 First three-dimensional model [0151] 91 Second three-dimensional model [0152] 92 Recording path [0153] 93 Control point [0154] 94 Control point [0155] 95 Recording path [0156] 96 Control point [0157] 97 Control point