CN107638224A - A kind of shape-position parameter measurement method for digitizing artificial tooth - Google Patents
A kind of shape-position parameter measurement method for digitizing artificial tooth Download PDFInfo
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Abstract
The invention discloses a kind of shape-position parameter measurement method for digitizing artificial tooth, including：Import artificial tooth model；The coordinate system of artificial tooth model is adjusted, to determine that the coordinate direction dir of artificial tooth model, coordinate direction dir meet：Z-axis is parallel with long axis of tooth direction, and x-axis is parallel near and far direction, and y-axis is parallel with cheek tongue or words direction, and x-axis, y-axis and z-axis direction meets right hand rule；According to coordinate direction dir,hAltitude range in by asking the method that coordinate is most worth to identify 5 height of contour of artificial tooth,hFor the height threshold of setting,hFor estimating cusp to the distance of gum edge；2 appearance and sizes are calculated according to the 5 of artificial tooth height of contour and determine 3 reference planes.The present invention is additionally arranged height thresholdh, both with it is workable the characteristics of, in turn ensure that the reliability of recognition result；2 appearance and sizes are calculated according to the 5 of artificial tooth height of contour and determine 3 reference planes, it is more convenient.It the composite can be widely applied to dentures repai field.
Description
Technical field
The present invention relates to oral cavity restoration field, especially a kind of shape-position parameter measurement method for digitizing artificial tooth.
Background technology
In oral restoration CAD/CAM system, the acquisition of artificial tooth morpheme parameter (including location parameter and form parameter) is
The basis of the repair such as the design of artificial tooth complete crown and teeth arrangement：The determination of denture space position and posture depends on position with adjustment
Parameter is put, the size scaling and experiment material of artificial tooth depend on form parameter.
The near and far footpath of corona and cheek/words footpath are relatively conventional dimensional parameters, to obtain dimensional parameters and first have to accurately
Identify the height of contour of artificial tooth.Height of contour, refer to part most prominent on each axial plane of tooth body, generally comprise mesial surface, it is remote in
4 face, cheek (lip) face and lingual surface height of contour.Wherein, the near and far footpath of tooth can be determined by near and far facial contour high point,
Cheek (lip) the tongue footpath of tooth can be determined by cheek (lip) lingual surface height of contour, and near and far footpath and cheek (lip) tongue footpath are to weigh tooth
The index of tooth length and width.Fig. 1 (a), (b) and (c) are respectively to grind one's teeth in sleep corona in gum (tooth conjunction) direction, cheek tongue direction and near and far side
To projection, it clearly show that tooth in all directions size and the relation of height of contour.
In order to obtain the size of tooth, it is thus proposed that first to find adjacent teeth near and far face and justice according to standard tooth statistics
The contact zone of teeth hat, the method that height of contour is then identified in contact area.Because statistics needs a large amount of statistics samples
Originally and based on the similarity mode of model, this method is difficult in actual applications.If in addition, according to profile height
The definition of point directly seeks the method that coordinate is most worth to identify height of contour in artificial tooth all directions, due to dental morphology and artificial tooth mould
The greatest differences of type mesh quality, the height of contour so identified are likely to occur relatively large deviation, especially when artificial tooth model
During with gum curved surface, only according to definition by asking coordinate extreme value to obtain height of contour, it is most likely that mistakenly recognize tooth
Gum part.
In terms of location parameter, the prior art main definitions coordinate direction of tooth, and because dental morphology is different, it is existing
There is technology to be difficult to determine its center, now common practice is to determine and adjust coordinate plane according to statistics, its reality
Operability is not strong.
In summary, prior art is primarily present following shortcoming：
(1) or existing height of contour recognition methods operability is not strong, otherwise it is less reliable, it is unfavorable for tooth morpheme
The measurement of parameter.
(2) prior art does not define unified morpheme parameter for artificial tooth, and rational base is established particular without for artificial tooth
Quasi- face, the design work such as it is unfavorable for zooming in and out artificial tooth in oral restoration CAD/CAM system, position and match, not enough just
Just.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to：It is workable, reliable and convenient to provide one kind,
Digitize the shape-position parameter measurement method of artificial tooth.
The technical solution used in the present invention is：
A kind of shape-position parameter measurement method for digitizing artificial tooth, comprises the following steps：
Import artificial tooth model；
The coordinate system of artificial tooth model is adjusted, to determine the coordinate direction dir of artificial tooth model, the coordinate direction of the determination
Dir meets：Z-axis is parallel with long axis of tooth direction, and x-axis is parallel near and far direction, and y-axis is parallel with cheek tongue or words direction, x-axis, y
Axle and z-axis direction meet right hand rule；
According to the coordinate direction dir of determination, the 5 of artificial tooth is identified by the method for asking coordinate to be most worth in h altitude range
Individual height of contour, the h are the height threshold of setting, and h is used to estimate cusp to the distance of gum edge；
2 appearance and sizes are calculated according to the 5 of artificial tooth height of contour and determine 3 reference planes.
Further, the artificial tooth model include but is not limited to ideal dental crowns model, from denture cutting single tooth model,
Abutment model and inlay preparation body Model.
Further, the coordinate system of the adjustment artificial tooth model, the step for determine the coordinate direction dir of artificial tooth model,
It includes：
Judge the type belonging to the artificial tooth model of importing；
The coordinate system of artificial tooth model is adjusted according to the result of judgement, to determine the coordinate direction dir of artificial tooth model.
Further, the coordinate system that artificial tooth model is adjusted according to the result of judgement, to determine the coordinate side of artificial tooth model
The step for dir, it is specially：
If the artificial tooth model imported belongs to ideal dental crowns model, directly with the good part of ideal dental crowns model setting themselves
Coordinate system direction is as the coordinate direction dir determined；If the artificial tooth model imported belongs to abutment model or the list from denture cutting
Tooth model or inlay preparation body Model, then first adjustment z-axis makes it parallel with long axis of tooth direction and its positive is pointed to by root of the tooth
Cusp, then adjusting x-axis makes it parallel near and far direction, and coordinate direction dir y-axis is finally determined according to right hand rule.
Further, the coordinate direction dir according to determination, the method in h altitude range by asking coordinate to be most worth
The step for identifying 5 height of contour of artificial tooth, it includes：
According to the elemental height threshold value h of setting0Calculate height threshold h；
According to the coordinate direction dir of determination, the 5 of artificial tooth is identified by the method for asking coordinate to be most worth in h altitude range
Individual height of contour, 5 height of contour of the artificial tooth include mesial surface, two height of contour of distal surfaceCheek
Face, two height of contour of lingual surfaceAnd highest cusp point
Further, the elemental height threshold value h according to setting0The step for calculating height threshold h, it includes：
According to the coordinate minimum value and maximum in the near and far direction of the coordinate direction dir of determination identification artificial teeth, and then according to
The coordinate minimum value identified goes out near and far footpath XLength with maximum primary Calculation；
Set elemental height threshold value h0, h is then compared using the XLength and statistical value W in the near and far footpath of artificial tooth of the same name0
It is modified, obtains height threshold h, the calculation formula of the height threshold h is：H=h0*XLength/W。
Further, the coordinate direction dir according to determination, the method in h altitude range by asking coordinate to be most worth
The step for identifying 5 height of contour of artificial tooth, it includes：
Identify the highest cusp point of artificial toothAnd its z coordinate top；
Remaining 4 height of contour of artificial tooth are identified in the range of (top-h)~topWith
Further, the elemental height threshold value h of the setting0=4.5, the statistical value W=in the near and far footpath of artificial tooth of the same name
7.5。
Further, it is described to calculate 2 appearance and sizes according to 5 height of contour of artificial tooth and determine 3 reference plane this steps
Suddenly, it includes：
Near and far footpath and buccolingual diameter or the two appearance and sizes of words footpath, institute are calculated according to the 5 of artificial tooth height of contour coordinates
The calculation formula for stating near and far footpath size_x is：Size_x=| x2-x1|；The calculation formula of buccolingual diameter or words the footpath size_y
For：Size_y=| y4–y3|, wherein, 5 height of contour coordinates of artificial tooth are respectively With
Determined according to the 5 of artificial tooth height of contour coordinates near and far direction median plane Plane_x, cheek tongue or words direction
This 3 reference planes of heart face Plane_y and top surface Plane_z, near and far direction median plane Plane_x the passing points ((x1+x2)/
2,0,0), the cheek tongue or words direction median plane Plane_y passing points (0, (y3+y4)/2,0), the top surface Plane_z warps
Cross point (0,0, z5)。
The beneficial effects of the invention are as follows：Coordinate direction dir including determining artificial tooth model, then according to the coordinate side of determination
To dir, the step of identifying 5 height of contour of artificial tooth by seeking the method that coordinate is most worth in h altitude range, existing
Coordinate is most worth on the basis of method seeks height of contour, is additionally arranged height threshold h, the identification of height of contour is limited to more than gum edge
Scope, be no longer dependent on the similarity mode of statistics and model, both with it is workable the characteristics of, in turn ensure that identification
As a result reliability；2 appearance and sizes are calculated according to the 5 of artificial tooth height of contour and determine 3 reference planes, give a set of system
One artificial tooth morpheme parameter and its computational methods, 3 rational reference planes especially are established for artificial tooth, are advantageous to repair in oral cavity
The design work such as zoom in and out, position and match in multiple CAD/CAM system to artificial tooth, more facilitate.
Brief description of the drawings
Fig. 1 is perspective view of the corona in three directions of grinding one's teeth in sleep；
Fig. 2 is a kind of overall flow figure for the shape-position parameter measurement method for digitizing artificial tooth of the present invention；
Fig. 3 is the height threshold h schematic diagrames that the present invention is set；
Fig. 4 is the preferable height of contour schematic diagram of corona；
Fig. 5 is the particular flow sheet of present invention identification height of contour；
Fig. 6 is the recognition result comparison diagram of different visual angles height of contour of the present invention；
The recognition result comparison diagram of different visual angles height of contour when Fig. 7 is prior art non-setting height threshold value；
Fig. 8 is the tooth morpheme parameter schematic diagram of the present invention；
Fig. 9 is the flow chart of the embodiment of the present invention two；
Figure 10 is the model structure schematic diagram of the inlay Tooth preparation that the embodiment of the present invention two inputs and homonymous standards corona；
Figure 11 is the design sketch after the adjustment of the inlay Tooth preparation coordinate system of the embodiment of the present invention two；
Figure 12 is the recognition result figure of the inlay Tooth preparation of the embodiment of the present invention two and ideal dental crowns height of contour；
Figure 13 is the reference plane schematic diagram of the inlay Tooth preparation that the embodiment of the present invention two determines and ideal dental crowns；
Figure 14 is the design sketch obtained after the ideal dental crowns of the embodiment of the present invention two scale；
Figure 15 is the design sketch obtained after the embodiment of the present invention two matches ideal dental crowns with inlay Tooth preparation.
Embodiment
A kind of reference picture 2, shape-position parameter measurement method for digitizing artificial tooth, comprises the following steps：
Import artificial tooth model；
The coordinate system of artificial tooth model is adjusted, to determine the coordinate direction dir of artificial tooth model, the coordinate direction of the determination
Dir meets：Z-axis is parallel with long axis of tooth direction, and x-axis is parallel near and far direction, and y-axis is parallel with cheek tongue or words direction, x-axis, y
Axle and z-axis direction meet right hand rule；
According to the coordinate direction dir of determination, the 5 of artificial tooth is identified by the method for asking coordinate to be most worth in h altitude range
Individual height of contour, the h are the height threshold of setting, and h is used to estimate cusp to the distance of gum edge；
2 appearance and sizes are calculated according to the 5 of artificial tooth height of contour and determine 3 reference planes.
It is further used as preferred embodiment, the artificial tooth model includes but is not limited to ideal dental crowns model, from denture
Single tooth model, abutment model and the inlay preparation body Model of cutting.
It is further used as preferred embodiment, the coordinate system of the adjustment artificial tooth model, to determine the seat of artificial tooth model
The step for marking direction dir, it includes：
Judge the type belonging to the artificial tooth model of importing；
The coordinate system of artificial tooth model is adjusted according to the result of judgement, to determine the coordinate direction dir of artificial tooth model.
It is further used as preferred embodiment, the coordinate system that artificial tooth model is adjusted according to the result of judgement, with true
The step for defining the coordinate direction dir of tooth model, it is specially：
If the artificial tooth model imported belongs to ideal dental crowns model, directly with the good part of ideal dental crowns model setting themselves
Coordinate system direction is as the coordinate direction dir determined；If the artificial tooth model imported belongs to abutment model or the list from denture cutting
Tooth model or inlay preparation body Model, then first adjustment z-axis makes it parallel with long axis of tooth direction and its positive is pointed to by root of the tooth
Cusp, then adjusting x-axis makes it parallel near and far direction, and coordinate direction dir y-axis is finally determined according to right hand rule.
Preferred embodiment is further used as, the coordinate direction dir according to determination, is led in h altitude range
The step for crossing 5 height of contour of the method identification artificial tooth for asking coordinate to be most worth, it includes：
According to the elemental height threshold value h of setting0Calculate height threshold h；
According to the coordinate direction dir of determination, the 5 of artificial tooth is identified by the method for asking coordinate to be most worth in h altitude range
Individual height of contour, 5 height of contour of the artificial tooth include mesial surface, two height of contour of distal surfaceBuccal surface,
Two height of contour of lingual surfaceAnd highest cusp point
Reference picture 5, it is further used as preferred embodiment, the elemental height threshold value h according to setting0Calculate height
The step for spending threshold value h, it includes：
According to the coordinate minimum value and maximum in the near and far direction of the coordinate direction dir of determination identification artificial teeth, and then according to
The coordinate minimum value identified goes out near and far footpath XLength with maximum primary Calculation；
Set elemental height threshold value h0, h is then compared using the XLength and statistical value W in the near and far footpath of artificial tooth of the same name0
It is modified, obtains height threshold h, the calculation formula of the height threshold h is：H=h0*XLength/W。
Reference picture 5, it is further used as preferred embodiment, the coordinate direction dir according to determination, in h height
In the range of by asking the method that coordinate is most worth to identify 5 height of contour of artificial tooth the step for, it includes：
Identify the highest cusp point of artificial toothAnd its z coordinate top；
Remaining 4 height of contour of artificial tooth are identified in the range of (top-h)~topWith
It is further used as preferred embodiment, the elemental height threshold value h of the setting0=4.5, the artificial tooth of the same name is near
The statistical value W=7.5 of remote central diameter.
Preferred embodiment is further used as, it is described according to 5 height of contour of artificial tooth, 2 appearance and sizes of calculating and true
The step for fixed 3 reference planes, it includes：
Near and far footpath and buccolingual diameter or the two appearance and sizes of words footpath, institute are calculated according to the 5 of artificial tooth height of contour coordinates
The calculation formula for stating near and far footpath size_x is：Size_x=| x2-x1|；The calculation formula of buccolingual diameter or words the footpath size_y
For：Size_y=| y4–y3|, wherein, 5 height of contour coordinates of artificial tooth are respectively With
Determined according to the 5 of artificial tooth height of contour coordinates near and far direction median plane Plane_x, cheek tongue or words direction
This 3 reference planes of heart face Plane_y and top surface Plane_z, near and far direction median plane Plane_x the passing points ((x1+x2)/
2,0,0), the cheek tongue or words direction median plane Plane_y passing points (0, (y3+y4)/2,0), the top surface Plane_z warps
Cross point (0,0, z5)。
The present invention is further explained and illustrated with reference to Figure of description and specific embodiment.
Embodiment one
For prior art operability it is not strong, unreliable and inconvenient the problem of, the present invention proposes a kind of brand-new
Digitize the shape-position parameter measurement method of artificial tooth.As shown in Fig. 2 this method mainly includes the following steps that：
Step 1：Import artificial tooth model.
The process object of the present invention is the triangle grid model of single artificial tooth, and the type of artificial tooth includes：Ideal dental crowns, from tooth
Arrange single tooth, abutment model and the inlay Tooth preparation of cutting.
Step 2：Determine coordinate direction dir：Artificial tooth model coordinate systems are adjusted, meet its coordinate direction dir：Z-axis and tooth
Long axis direction is parallel, and x-axis is parallel near and far direction, and y-axis is parallel with cheek tongue direction or words direction, and x, y, z direction meets the right side
Hand criterion.Dir is different from rectangular coordinate system in space, and it only requires coordinate direction, without requiring the origin of coordinates.
Determining coordinate direction dir mode is included automatically and manually.Due to ideal dental crowns when establishing database basis
Unique characteristics set local coordinate system, therefore ideal dental crowns are not required to additionally determine coordinate direction；Cut for abutment, from denture
Single tooth and inlay Tooth preparation, the present invention first manually adjusts that z-axis makes it parallel with long axis of tooth direction and its is positive by root of the tooth
Cusp is pointed to, then adjusting x-axis makes it parallel with the near and far direction of artificial tooth, and y-axis, y-axis forward direction are determined then according to right hand rule
Point to tongue side.
Step 3：Obtain 5 height of contour
The coordinate direction dir determined according to step 2, the present invention is by asking the method that coordinate is most worth to identify outside 5 of artificial tooth
Shape high point, including：Two height of contour of mesial surface, distal surfaceTwo height of contour of buccal surface, lingual surfaceAnd highest cusp pointThe preferable height of contour of corona is as shown in Figure 4.
Because the single tooth that is directly cut from denture or abutment are often with gum curved surface (as shown in Figure 3), directly
Height of contour is searched on overall tooth model, larger deviation occurs in obtained near and far direction height of contour, is this
Invention sets a height threshold h to estimate cusp to the distance of gum edge, then by seeking coordinate most in h altitude range
The method identification height of contour of value.Further, in order that height threshold h is when tested tooth model is scaled (out-of-size)
Still effectively, the present invention first sets an initial threshold h0, then using primary Calculation near and far footpath XLength with it is of the same name
The statistical value W in the near and far footpath of artificial tooth comparison h0It is modified, so as to obtain dynamic height threshold value h.
Reference picture 5, one embodiment that the present invention obtains height of contour comprise the following steps：
(1) the near and far footpath XLength of primary Calculation.
Identify the coordinate minimum value and maximum in artificial tooth near and far direction according to coordinate direction dir, and then according to identifying
Coordinate minimum value and maximum primary Calculation go out near and far footpath XLength.
(2) setting height threshold value h.
Initial setting height threshold h0, then compare h with the XLength and statistical value W in the near and far footpath of artificial tooth of the same name0Enter
Row amendment, i.e. h=h0*XLength/W；Wherein, h0=4~5；As preferred embodiment, h is taken0=4.5, W=7.5, i.e. h
=4.5*XLength/7.5.
(3) highest cusp point is identifiedAnd its z coordinate top.
(4) other 4 height of contour are identified in the range of (top-h)~top.
Fig. 6 be height of contour recognition result figure of the present invention (set height threshold h), wherein, the banding near gum edge
Color region display height threshold h positions, the recognition effect of height of contour are normal；As a comparison, Fig. 7 is not setting height threshold
The recognition result figure (i.e. prior art) of value, its cheek lingual surface (y-axis direction) height of contour identified are in below gum edge, are mistake
Recognition result.
Step 4：Calculate 2 appearance and sizes and determine 3 reference planes.
Remember that 5 height of contour coordinates that step 3 obtains are respectively WithThis step can be further subdivided into：
(1) form parameter is calculated.
Reference picture 8 (a), calculate 2 appearance and sizes --- near and far footpath size_x and cheek (lip) tongue footpath size_y：size_x
=| x2-x1|, size_y=| y4–y3|。
(2) location parameter is determined.
Reference picture 8 (b), determine 3 reference planes --- near and far direction median plane Plane_x, cheek (lip) tongue direction center
Face Plane_y and top surface Plane_z：Plane_x passing points ((x1+x2)/2,0,0), Plane_y passing points (0, (y3+y4)/2,
0), Plane_z passing points (0,0, z5)。
Embodiment two
, it is necessary to first match ideal dental crowns with inlay Tooth preparation in the design of inlay dummy.For this is expanded on further
A kind of effect for the shape-position parameter measurement method for digitizing artificial tooth is invented, a method by the present invention is now provided and is applied to standard
The embodiment that corona matches with inlay Tooth preparation, as shown in Figure 9.
As shown in figure 9, the present embodiment specifically includes following steps：
Step 1：Input inlay Tooth preparation and homonymous standards corona.
Reference picture 10, input inlay Tooth preparation Inlay and homonymous standards corona Crown models.Wherein, ideal dental crowns are usual
All there is rational coordinate direction dir, and the coordinate system of inlay Tooth preparation then needs further to adjust.
Step 2：Adjust inlay Tooth preparation coordinate direction.
Ideal dental crowns have rational coordinate system XC、YC、ZC, it is no longer necessary to adjust；Reference picture 11, adjust inlay preparation
Body coordinate system, make its ZIAxle points to cusp, X parallel to long axis of tooth and its forward direction by root of the toothIAxle is parallel near and far direction, YIAxle
Meet corresponding right-handed coordinate system and YIAxle is positive to point to tongue side.
Step 3：The height of contour of inlay Tooth preparation and the height of contour of ideal dental crowns are identified respectively.
Reference picture 12,5 height of contour (specific steps and the present invention reality of inlay Tooth preparation and ideal dental crowns are identified respectively
The step of applying example one three is identical).Buccal surface (Y is only show due to visual angle, in Figure 12I、YCNegative sense), distal surface (XI、XC
It is positive) and top surface (ZI、ZCIt is positive) height of contour.
Step 4：Inlay Tooth preparation, 2 appearance and sizes of ideal dental crowns are calculated respectively, and determine its 3 reference planes.
This step can be further subdivided into：
(1) form parameter is calculated.
The height of contour identified according to the present embodiment step 3,2 sizes of inlay Tooth preparation are calculated respectively：
size_xC、size_yC, 2 sizes of ideal dental crowns：size_xI、size_yI(specific computational methods and the embodiment of the present invention
The computational methods of one step 4 are identical).
(2) location parameter is determined.
Reference picture 13,3 reference planes of inlay Tooth preparation are determined respectively：Standard tooth
It is preced with 3 reference planes：
Step 5：Ideal dental crowns are zoomed in and out.
2 size size_x according to inlay Tooth preparationC、size_yCIdeal dental crowns are zoomed in and out, comprised the following steps that：
(1) according to the form parameter having calculated that, ideal dental crowns all directions scaling sf is determined：
X directions：Sf [0]=size_xC/size_xI；
Y directions：Sf [1]=size_yC/size_yI；
Z directions：Sf [2]=(sf [0]+sf [1])/2.
(2) coordinate transform is carried out to ideal dental crowns with scaled matrix S, ideal dental crowns size is matched with inlay Tooth preparation.
Wherein,Design sketch after ideal dental crowns scaling is as shown in figure 14.
Step 6：Respectively overlap each reference plane reference plane corresponding with inlay Tooth preparation of ideal dental crowns.
It has been respectively that inlay Tooth preparation and ideal dental crowns determine that position is joined in the step of embodiment of the present invention two four
Number --- reference plane, on this basis, can be easily by the location matches of ideal dental crowns and inlay Tooth preparation, specific implementation side
Method is：Make 3 reference planes of ideal dental crownsRespectively with 3 reference planes of inlay Tooth preparation Alignment.
Pass through above-mentioned steps, you can realize the matching of ideal dental crowns and inlay Tooth preparation, (Figure 15 Plays as shown in figure 15
Corona is shown by way of wire frame).
By the present embodiment, it is not difficult to find out, the morpheme parameter of method of the invention measurement is quite convenient in oral restoration
The design work such as zoom in and out, position and match in CAD/CAM system to artificial tooth.
The present invention proposes a kind of shape-position parameter measurement method for digitizing artificial tooth, by setting height threshold h, by profile
The identification of high point is limited to scope more than gum edge, and the strategy was both easy to implement, in turn ensure that the reliability of recognition result；Enter one
Step, calculate 2 appearance and sizes by 5 height of contour of identification and determine 3 reference planes, join using it as the morpheme of artificial tooth
Number, the design work such as it is easy to zoom in and out artificial tooth in oral restoration CAD/CAM system, position and match.
Above is the preferable implementation to the present invention is illustrated, but the present invention is not limited to the embodiment, ripe
A variety of equivalent variations or replacement can also be made on the premise of without prejudice to spirit of the invention by knowing those skilled in the art, this
Equivalent deformation or replacement are all contained in the application claim limited range a bit.
Claims (9)
- A kind of 1. shape-position parameter measurement method for digitizing artificial tooth, it is characterised in that：Comprise the following steps：Import artificial tooth model；The coordinate system of artificial tooth model is adjusted, to determine that the coordinate direction dir of artificial tooth model, the coordinate direction dir of the determination expire Foot：Z-axis is parallel with long axis of tooth direction, and x-axis is parallel near and far direction, and y-axis is parallel with cheek tongue or words direction, x-axis, y-axis and z Direction of principal axis meets right hand rule；According to the coordinate direction dir of determination, identified in h altitude range by the method for asking coordinate to be most worth outside 5 of artificial tooth Shape high point, the h are the height threshold of setting, and h is used to estimate cusp to the distance of gum edge；2 appearance and sizes are calculated according to the 5 of artificial tooth height of contour and determine 3 reference planes.
- A kind of 2. shape-position parameter measurement method for digitizing artificial tooth according to claim 1, it is characterised in that：The artificial tooth Model includes but is not limited to ideal dental crowns model, single tooth model, abutment model and inlay Tooth preparation from denture cutting Model.
- A kind of 3. shape-position parameter measurement method for digitizing artificial tooth according to claim 2, it is characterised in that：The adjustment The coordinate system of artificial tooth model, the step for determine the coordinate direction dir of artificial tooth model, it includes：Judge the type belonging to the artificial tooth model of importing；The coordinate system of artificial tooth model is adjusted according to the result of judgement, to determine the coordinate direction dir of artificial tooth model.
- A kind of 4. shape-position parameter measurement method for digitizing artificial tooth according to claim 3, it is characterised in that：The basis The coordinate system of the result adjustment artificial tooth model of judgement, the step for determine the coordinate direction dir of artificial tooth model, it is specially：If the artificial tooth model imported belongs to ideal dental crowns model, directly with the good local coordinate of ideal dental crowns model setting themselves It is coordinate direction dir of the direction as determination；If the artificial tooth model imported belongs to abutment model or the single tooth from denture cutting Tooth model or inlay preparation body Model, then first adjustment z-axis make it parallel with long axis of tooth direction and its it is positive cusp is pointed to by root of the tooth, Then adjustment x-axis makes it parallel near and far direction, and coordinate direction dir y-axis is finally determined according to right hand rule.
- A kind of 5. shape-position parameter measurement method for digitizing artificial tooth according to claim 1, it is characterised in that：The basis The coordinate direction dir of determination, in h altitude range by ask the method that coordinate is most worth identify artificial tooth 5 height of contour this One step, it includes：According to the elemental height threshold value h of setting0Calculate height threshold h；According to the coordinate direction dir of determination, identified in h altitude range by the method for asking coordinate to be most worth outside 5 of artificial tooth Shape high point, 5 height of contour of the artificial tooth include mesial surface, two height of contour of distal surfaceBuccal surface, tongue Two height of contour in faceAnd highest cusp point
- A kind of 6. shape-position parameter measurement method for digitizing artificial tooth according to claim 5, it is characterised in that：The basis The elemental height threshold value h of setting0The step for calculating height threshold h, it includes：The coordinate minimum value and maximum in the near and far direction of artificial tooth are identified according to the coordinate direction dir of determination, and then according to identification The coordinate minimum value gone out goes out near and far footpath XLength with maximum primary Calculation；Set elemental height threshold value h0, h is then compared using the XLength and statistical value W in the near and far footpath of artificial tooth of the same name0Carry out Amendment, obtains height threshold h, the calculation formula of the height threshold h is：H=h0*XLength/W。
- A kind of 7. shape-position parameter measurement method for digitizing artificial tooth according to claim 5, it is characterised in that：The basis The coordinate direction dir of determination, in h altitude range by ask the method that coordinate is most worth identify artificial tooth 5 height of contour this One step, it includes：Identify the highest cusp point of artificial toothAnd its z coordinate top；Remaining 4 height of contour of artificial tooth are identified in the range of (top-h)~top
- A kind of 8. shape-position parameter measurement method for digitizing artificial tooth according to claim 6, it is characterised in that：The setting Elemental height threshold value h0=4.5, the statistical value W=7.5 in the near and far footpath of artificial tooth of the same name.
- A kind of 9. shape-position parameter measurement method of digitlization artificial tooth according to claim any one of 5-8, it is characterised in that： Described the step for calculating 2 appearance and sizes according to 5 height of contour of artificial tooth and determining 3 reference planes, it includes：Near and far footpath and buccolingual diameter or the two appearance and sizes of words footpath are calculated according to the 5 of artificial tooth height of contour coordinates, it is described near Remote central diameter size_x calculation formula is：Size_x=| x2-x1|；The calculation formula of buccolingual diameter or words the footpath size_y is： Size_y=| y4–y3|, wherein, 5 height of contour coordinates of artificial tooth are respectively WithNear and far direction median plane Plane_x, cheek tongue or words direction median plane are determined according to the 5 of artificial tooth height of contour coordinates This 3 reference planes of Plane_y and top surface Plane_z, near and far direction median plane Plane_x the passing points ((x1+x2)/2,0, 0), the cheek tongue or words direction median plane Plane_y passing points (0, (y3+y4)/2,0), the top surface Plane_z passing points (0,0,z5)。
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| CN112089500A (en) * | 2020-09-17 | 2020-12-18 | 深圳云甲科技有限公司 | Denture alignment method, terminal and storage medium |
| CN113116572A (en) * | 2021-03-01 | 2021-07-16 | 北京联袂义齿技术有限公司 | False tooth model forming system and forming method based on cloud computing |
| CN113995539A (en) * | 2021-10-25 | 2022-02-01 | 北京大学口腔医院 | Method and system for constructing breast crown physiological database |
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