CN105030347A - Digital orthodontic tooth arrangement method based on tooth root information and bracket transfer device designing method based on digital orthodontic tooth arrangement method - Google Patents
Digital orthodontic tooth arrangement method based on tooth root information and bracket transfer device designing method based on digital orthodontic tooth arrangement method Download PDFInfo
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Abstract
The invention discloses a digital orthodontic tooth arrangement method based on tooth root information and a bracket transfer device designing method based on the digital orthodontic tooth arrangement method. The digital orthodontic tooth arrangement method based on the tooth root information comprises the following steps that data are read in; a complete tooth model is guided in, and receiving data of the digital orthodontic tooth arrangement design include a skull STL model of a patient and a complete tooth STL model; characteristics of each tooth are extracted and include complete data of the dental crown and the tooth root; a tooth characteristic constraint database is built and includes a serial number of each tooth and coordinates and serial numbers of characteristic points in a point cloud model; digital lower jaw tooth arrangement is performed; digital upper jaw tooth arrangement is performed. The digital orthodontic tooth arrangement method based on the tooth root information is applied to an orthodontic treatment plan, parameterization comprehensive tooth arrangement of visualized adjustment of dental crown contact and tooth root postures is achieved, a bracket transfer device is designed after tooth arrangement is performed, and the digital orthodontic tooth arrangement method has the important application value in the computer-assisted orthodontic field.
Description
Technical field:
The present invention relates to a kind of digitized correction based on root information row's tooth method and the bracket transfer device method for designing based on the method, it belongs to field of computer aided design, relates to reverse-engineering and biomedical engineering field.
Background technology:
Oral disease is a kind of common multiple diseases.According to World Health Organization's statistics, malocclusion has become one of three large oral diseases (dental caries, periodontal disease and malocclusion).Malocclusion all has a great impact the growth of oral health, oral cavity function, maxillofacial bone bone and appearance.Orthodontics has been considered to a requisite pith in oral cavity health treatment.Traditional orthodontic treatment mainly relies on the experience of doctor to formulate and rescues scheme.Before therapeutic scheme is determined, manually the experiment of row's tooth can help the therapeutic process of orthodontist expectation involved by orthodontic treatment, and informs the Tooth Movement that patient may relate to and final therapeutic effect.The major defect of manual row's tooth process is that efficiency is low, and consumes lot of materials.Manual row's tooth step mainly comprises: (1) makes tooth jaw plaster model; (2) in plaster model substrate, involved tooth is blocked; (3) tooth of required movement is reorientated; (4) glutinous wax is fixed.
Along with the high speed development of computer picture, CAD/CAM technology is widely used in various field, comprises gear division application.Increasing gear division technical staff uses digitization tools to carry out design and the emulation of armarium and process in clinical treatment, and computer carries out the focus that orthodontic treatments has become mouth cavity orthodontic educational circles gradually.Tooth arrangement occupies very consequence in Virtual Orthodontic System.Realizing the arrangement of tooth under three-dimensional space environment in Virtual Orthodontic System, is a complicated problem.There is following problem in existing method: (1) does not consider root of the tooth in measuring and analysis process, is only suitable for the information of corona, may cause treatment in treatment after root of the tooth move to outside cortical bone; (2) comparatively rough row's tooth process and less constraints cause lower row's tooth accuracy and operability.
Relative to manually arranging tooth, virtual row's tooth is without the need to carrying out cutting process to plaster model, and arrange tooth process is feature based Constraints driven simultaneously, and without the need to operating separately every tooth, automaticity is high, and row's tooth efficiency also can be improved.The position relationship of root of the tooth and alveolar bone is incorporated in the design of algorithm, consider corona and root information, more reasonable therapeutic scheme accurately can not only be designed, prevent the situation generation that root of the tooth gives prominence to alveolar bone, and this situation can be prevented to occur in dental growth process.
Summary of the invention:
The invention provides a kind of digitized correction based on root information row's tooth method and the bracket transfer device method for designing based on the method, it is low for efficiency in tradition row tooth, consume lot of materials, lack the problem of root of the tooth and jaw relation information in existing virtual row's tooth process, the virtual personalitiesization proposed based on complete tooth model and skull information accurately arranges tooth method.
The present invention adopts following technical scheme: a kind of row of the digitized correction based on root information tooth method, and it comprises following method:
Step one: data are read in, imports complete tooth model, and the data that accept of digitized correction row tooth design comprise: the skull S TL model of patient, complete tooth STL model;
Step 2: extract every tooth feature, comprise the partial data of corona and root of the tooth;
Step 3: set up dental features binding database: dental features binding database comprises characteristic point coordinate and characteristic point sequence number in the sequence number of every tooth and point cloud model;
Step 4: lower jaw digitized row tooth;
Step 5: upper jaw digitized row tooth.
Further, lower jaw digitized row tooth procedure decomposition is (1) interactive mode location infradentale; (2) lower jaw bracket plane and coordinate system is built; (3) mandibular dental arch curve is generated; (4) mandibular dental arch curve is edited; (5) utilize corona information auto arrangement mandibular teeth, if row's tooth result does not meet operator's requirement, then return (4), otherwise, continue next step; (6) root information is utilized to build lower jaw root of the tooth plane; (7) lower jaw root surface curve is built; (8) lower jaw root of the tooth position is adjusted.
Further, upper jaw digitized row tooth procedure decomposition is that (1) is according to laminating covering relation location maxillary central incisors; (2) upper jaw bracket plane and coordinate system is built; (3) mandibular dental arch curve is utilized to generate dental arch of maxilla curve; (4) dental arch of maxilla curve is edited; (5) utilize corona information auto arrangement maxillary teeth, if row's tooth result does not meet operator's requirement, then return (4), otherwise, continue next step; (6) root information is utilized to build maxillary teeth rhizoplane; (7) upper jaw root surface curve is built; (8) upper jaw root of the tooth position is adjusted.
Further, according to the type of tooth, characteristic point can be defined as incisor: nearly mid point, mid point far away, the nearly mid point of incisxal edge, incisxal edge mid point far away, bracket point, tooth den, root of the tooth point; Canine tooth: cusp point, nearly mid point, mid point far away, bracket point, root of the tooth point; Premolars: cheek side cusp, tongue side cusp, bracket point, nearly mid point, mid point, root of the tooth point far away; Grind one's teeth in sleep: closely mid point, mid point far away, the nearly middle cusp in cheek side, cheek side middle cusp, tongue side cusp, bracket point, root of the tooth point far away.
The present invention also adopts following technical scheme: a kind of bracket transfer device method for designing based on digitized correction row tooth method, it comprises the steps:
(1) bracket model is imported;
(2) extract bracket feature, in the characteristic point of bracket threedimensional model surface extraction representative model shape facility, and determine bracket center;
(3) component bracket coordinate system, utilizes the characteristic point in step (2) and central point to build the relative coordinate system of bracket self;
(4) at global coordinate system, (world coordinates is the coordinate system of model place environment, relative coordinate is model local Coordinate System, adjustment relative coordinate system is relative to the position relationship of global coordinate system, thus transformation matrix is reflected on model, can the adjustment of implementation model pose) under, adjustment bracket and the pose of tooth relative coordinate system, can positioning brackets model at dental surface;
(5) bracket transfer device is designed, under guarantee transfer device and bracket are easy to the prerequisite departed from, utilize the thought of shallow encirclement, consider the relative position of bracket and tooth, and bracket profile and cusp portion profile, utilize bracket bounding box and cusp form as transfer device inner surface, then build bracket transfer device with the form of body.
The present invention has following beneficial effect:
(1) the present invention proposes the new row of the digitized correction based on root information tooth method, and be applied in orthodontic treatment plan, the parametrization realizing corona contact and the visual adjustment of root of the tooth attitude comprehensively arranges tooth, and after row's tooth, design bracket transfer device, have important using value at area of computer aided orthodontic field;
(2) operation interface that simplicity of design is understandable, is dissolved into operation interface by row's tooth method, enables the easier left-hand seat of operator, increases work efficiency;
(3) personalized dental features binding database
The pole of figure of each tooth is irregular, accurate mathematical description carries out to it very difficult, but from anatomical viewpoint, each tooth has several characteristic point relatively determined, by the characteristic point of interactive mode pickup dental surface, by characteristic point stored in dental features binding database;
(4) automatic row's tooth method of feature based constraint
The spatial pose shift theory of mathematical model and rigid body is mated according to denture form, utilize dental features data base, build bracket plane, the binding characteristics such as dental arch curve, under feature constraint, utilize the feature of tooth own, by tooth auto arrangement to correct position, the method automaticity is high, and row's tooth efficiency is also improved;
(5) the root of the tooth attitude adjusting method of feature based
Utilize dental features binding database, the complete tooth model of combined belt root of the tooth and skull model, adjustment root of the tooth relative to the attitude of skull model, the method not only situation generation of root of the tooth projecting teeth groove bone after the row of prevention tooth, and this situation can be prevented to occur in dental growth process.
Accompanying drawing illustrates:
Fig. 1 is the flow chart of the digitized correction row tooth method that the present invention is based on root information.
Fig. 2 is denture original state.
Fig. 3 is for building lower jaw bracket plane.
Fig. 4 arranges tooth schematic diagram automatically: (X
t, Y
t) be mid point far away, (X
t-1, Y
t-1) be nearly mid point.
Fig. 5 is the relation of dental arch curve and tooth after lower jaw row tooth completes.
Fig. 6 is for building lower jaw root of the tooth plane and root of the tooth curve.
Fig. 7 is upper infradentale position relationship.
Fig. 8 is the relation of mandibular dental arch curve and dental arch of maxilla curve.
Fig. 9 is row's tooth binding characteristic.
Figure 10 is denture on the right side of row's tooth after completing.
Figure 11 is denture on the left of row's tooth after completing.
Figure 12 is the structure chart of tooth and bracket.
Figure 13 is the bracket structure figure behind location.
Figure 14 is bracket and bracket transfer device structure chart.
Figure 15 is bracket transfer device structure chart.
Figure 16 is maxillary dentition, bracket and bracket transfer device structure chart.
Wherein:
1-bracket point; 2-lower jaw bracket plane; 3-central incisor; 4-lateral incisor; 5-canine tooth; 6-premolars; 7-grinds one's teeth in sleep; 8-mandibular dental arch curve; 9-lower jaw root of the tooth plane; 10-lower jaw root of the tooth spot projection point; 11-lower jaw root surface curve; 12-dental arch of maxilla curve; 13-upper jaw bracket plane; 14-maxillary teeth rhizoplane; 15-upper jaw root of the tooth curve; 16-upper jaw root of the tooth spot projection point; 17-location feature point; 18-maxillary central incisors; 19-infradentale.
Detailed description of the invention:
Please refer to shown in Fig. 1, the present invention is based on the digitized correction row tooth method of root information, comprise the steps:
Step one: data are read in, imports complete tooth model: the data that accept of digitized correction row tooth design comprise: the skull S TL model of patient, complete tooth STL model.Skull S TL model is rebuild for utilizing Cranial Computed Tomography scan-data, and complete tooth STL model is similarly and utilizes Cranial Computed Tomography scan-data to rebuild.
Step 2: extract every tooth feature, comprise the partial data of corona and root of the tooth.
Step 3: set up dental features binding database: dental features binding database comprises characteristic point coordinate and characteristic point sequence number in the sequence number of every tooth and point cloud model.According to the type of tooth, characteristic point can be defined as (1) incisor: nearly mid point, mid point far away, the nearly mid point of incisxal edge, incisxal edge mid point far away, bracket point, tooth den, root of the tooth point; (2) canine tooth: cusp point, nearly mid point, mid point far away, bracket point, root of the tooth point; (3) premolars: cheek side cusp, tongue side cusp, bracket point, nearly mid point, mid point, root of the tooth point far away; (4) grind one's teeth in sleep: closely mid point, mid point far away, the nearly middle cusp in cheek side, cheek side middle cusp, tongue side cusp, bracket point, root of the tooth point far away.
Step 4: lower jaw digitized row tooth, wherein arranging tooth procedure decomposition is (1) interactive mode location infradentale, rotates principle, build six-freedom degree based on Rigid Body In Space, in conjunction with skull S TL model, the pose of interactive adjusting central incisor; (2) build lower jaw bracket plane and coordinate system (as shown in Figure 3), utilize the mid point of two infradentale bracket points, on the left of lower jaw, on the right side of the bracket point of first molar and lower jaw, the bracket point of first molar sets up lower jaw bracket plane.With lower jaw bracket plane for reference, along its normal direction, adjustment tooth position, makes the bracket of tooth point be positioned in lower jaw bracket plane; (3) generate mandibular dental arch curve (as shown in Figure 4), with the subpoint of the nearly mid point of central incisor, bilateral canine tooth cusp point and bilateral second molar mid point far away for data point, utilize B-spline curves matching mandibular dental arch curve; (4) edit mandibular dental arch curve (as shown in Figure 5), by five data point reverse curve control points, finally draw B-spline curves.By the position editor mandibular dental arch curve of adjustment control point in bracket plane, obtain satisfactory arc; (5) utilize corona information auto arrangement mandibular teeth, utilize the middle characteristic point near far away of tooth, build the chord length of tooth.From incisor, go out the position of tooth corresponding string on mandibular dental arch curve according to the wide iterative computation of tooth, realize automatically arranging tooth, if row's tooth result does not meet operator's requirement, then return (4), otherwise, continue next step; (6) utilize root information to build lower jaw root of the tooth plane (as shown in Figure 6), according to doctors experience, lower jaw root of the tooth plane is parallel with lower jaw bracket plane, and at a distance of 15mm, defines lower jaw root of the tooth plane according to this; (7) building lower jaw root surface curve, by all for lower jaw tooth root of the tooth spot projections to lower jaw root of the tooth plane, and is data point with subpoint, utilizes B-spline curves to build lower jaw root surface curve; (8) lower jaw root of the tooth position is adjusted, in conjunction with skull model, with the nearly middle characteristic point line far away of tooth for axis, by root of the tooth subpoint mobile in lower jaw root of the tooth plane, correspondence acts on root of the tooth point, tooth is enable to pivot to ensure that root of the tooth is positioned at alveolar bone, and the form of real-time update lower jaw root of the tooth curve.
Step 5: upper jaw digitized row tooth, wherein arranging tooth procedure decomposition is that (1) is according to laminating covering relation location maxillary central incisors (as shown in Figure 7), utilize the relative position relation of the nearly mid point of infradentale incisxal edge, maxillary central incisors tooth den and the nearly mid point of maxillary central incisors incisxal edge, determine the final position of maxillary central incisors; (2) build upper jaw bracket plane and coordinate system, utilize the mid point of two maxillary central incisors bracket points, on the left of the upper jaw, on the right side of the bracket point of first molar and the upper jaw, the bracket point of first molar sets up upper jaw bracket plane.With upper jaw bracket plane for reference, along its normal direction, adjustment maxillary teeth position, makes the bracket of maxillary teeth point be positioned in upper jaw bracket plane; (3) mandibular dental arch curve is utilized to generate dental arch of maxilla curve (as shown in Figure 8), need when building dental arch of maxilla curve to consider occlusion problem, mandibular dental arch curve is expanded 2mm along its normal direction, and is projected to upper jaw bracket plane, to build dental arch of maxilla curve; (4) edit dental arch of maxilla curve, by the adjustment position of dental arch of maxilla curve control point in upper jaw bracket plane, to edit dental arch of maxilla curve, obtain satisfactory arc; (5) corona information auto arrangement maxillary teeth is utilized, utilize the middle characteristic point near far away of tooth, build the chord length of tooth, from incisor, go out the position of tooth corresponding string on dental arch of maxilla curve according to the wide iterative computation of tooth, realize automatically arranging tooth, if row's tooth result does not meet operator's requirement, then return (4), otherwise, continue next step; (6) utilize root information to build maxillary teeth rhizoplane (as shown in Figure 9), according to doctors experience, maxillary teeth rhizoplane is parallel with upper jaw bracket plane, and at a distance of 15mm.Define maxillary teeth rhizoplane according to this; (7) building upper jaw root surface curve, by all for upper jaw tooth root of the tooth spot projections to upper jaw root of the tooth plane, and is data point with subpoint, utilizes B-spline curves to build upper jaw root surface curve; (8) upper jaw root of the tooth position is adjusted, in conjunction with skull model, with the nearly middle characteristic point line far away of maxillary teeth for axis, by root of the tooth subpoint mobile in maxillary teeth rhizoplane, correspondence acts on root of the tooth point, maxillary teeth is enable to pivot to ensure that root of the tooth is positioned at alveolar bone, and the form of real-time update upper jaw root of the tooth curve.
The present invention is according to orthodontist experience, and in conjunction with computer-implemented method, design the digitized correction row tooth method based on root information, the method is easy to computer and realizes, and meets doctor's requirement.
The present invention is based on the bracket transfer device method for designing of above-mentioned digitized correction row tooth method, comprise the steps:
(1) bracket model is imported;
(2) extract bracket feature, in the characteristic point of bracket threedimensional model surface extraction representative model shape facility, and determine bracket center;
(3) component bracket coordinate system, utilizes the characteristic point in step (2) and central point to build the relative coordinate system of bracket self;
(4) at global coordinate system, (world coordinates is the coordinate system of model place environment, relative coordinate is model local Coordinate System, adjustment relative coordinate system is relative to the position relationship of global coordinate system, thus transformation matrix is reflected on model, can the adjustment of implementation model pose) under, adjustment bracket and the pose of tooth relative coordinate system, can positioning brackets model at dental surface;
(5) design bracket transfer device, under guarantee transfer device and bracket are easy to the prerequisite departed from, utilize the thought of shallow encirclement, consider the relative position of bracket and tooth, and bracket profile and cusp portion profile.Utilize bracket bounding box and cusp form as transfer device inner surface, then build bracket transfer device with the form of body.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make some improvement under the premise without departing from the principles of the invention, and these improvement also should be considered as protection scope of the present invention.
Claims (5)
1., based on a digitized correction row tooth method for root information, it is characterized in that: comprise following method
Step one: data are read in, imports complete tooth model, and the data that accept of digitized correction row tooth design comprise: the skull S TL model of patient, complete tooth STL model;
Step 2: extract every tooth feature, comprise the partial data of corona and root of the tooth;
Step 3: set up dental features binding database: dental features binding database comprises characteristic point coordinate and characteristic point sequence number in the sequence number of every tooth and point cloud model;
Step 4: lower jaw digitized row tooth;
Step 5: upper jaw digitized row tooth.
2. as claimed in claim 1 based on the digitized correction row tooth method of root information, it is characterized in that: lower jaw digitized row tooth procedure decomposition is (1) interactive mode location infradentale; (2) lower jaw bracket plane and coordinate system is built; (3) mandibular dental arch curve is generated; (4) mandibular dental arch curve is edited; (5) utilize corona information auto arrangement mandibular teeth, if row's tooth result does not meet operator's requirement, then return (4), otherwise, continue next step; (6) root information is utilized to build lower jaw root of the tooth plane; (7) lower jaw root surface curve is built; (8) lower jaw root of the tooth position is adjusted.
3. as claimed in claim 1 based on the digitized correction row tooth method of root information, it is characterized in that: upper jaw digitized row tooth procedure decomposition is for (1) is according to laminating covering relation location maxillary central incisors; (2) upper jaw bracket plane and coordinate system is built; (3) mandibular dental arch curve is utilized to generate dental arch of maxilla curve; (4) dental arch of maxilla curve is edited; (5) utilize corona information auto arrangement maxillary teeth, if row's tooth result does not meet operator's requirement, then return (4), otherwise, continue next step; (6) root information is utilized to build maxillary teeth rhizoplane; (7) upper jaw root surface curve is built; (8) upper jaw root of the tooth position is adjusted.
4. as claimed in claim 1 based on the digitized correction row tooth method of root information, it is characterized in that: in step 3, according to the type of tooth, characteristic point can be defined as incisor: nearly mid point, mid point far away, the nearly mid point of incisxal edge, incisxal edge mid point far away, bracket point, tooth den, root of the tooth point; Canine tooth: cusp point, nearly mid point, mid point far away, bracket point, root of the tooth point; Premolars: cheek side cusp, tongue side cusp, bracket point, nearly mid point, mid point, root of the tooth point far away; Grind one's teeth in sleep: closely mid point, mid point far away, the nearly middle cusp in cheek side, cheek side middle cusp, tongue side cusp, bracket point, root of the tooth point far away.
5., based on the bracket transfer device method for designing as the digitized correction row tooth method in claim 1-4 as described in any one, it is characterized in that: comprise the steps
(1) bracket model is imported;
(2) extract bracket feature, in the characteristic point of bracket threedimensional model surface extraction representative model shape facility, and determine bracket center;
(3) component bracket coordinate system, utilizes the characteristic point in step (2) and central point to build the relative coordinate system of bracket self;
(4) under global coordinate system, adjustment bracket and the pose of tooth relative coordinate system, can positioning brackets model at dental surface;
(5) bracket transfer device is designed, under guarantee transfer device and bracket are easy to the prerequisite departed from, utilize the thought of shallow encirclement, consider the relative position of bracket and tooth, and bracket profile and cusp portion profile, utilize bracket bounding box and cusp form as transfer device inner surface, then build bracket transfer device with the form of body.
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