CN111981980B - Method and system for testing suitability deviation of dental prosthesis CAD and manufacturing process - Google Patents
Method and system for testing suitability deviation of dental prosthesis CAD and manufacturing process Download PDFInfo
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- CN111981980B CN111981980B CN202010831818.3A CN202010831818A CN111981980B CN 111981980 B CN111981980 B CN 111981980B CN 202010831818 A CN202010831818 A CN 202010831818A CN 111981980 B CN111981980 B CN 111981980B
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
Abstract
The invention provides a method and a system for testing the suitability deviation of a dental prosthesis CAD and a manufacturing process, wherein the method for testing the suitability deviation of the dental prosthesis CAD and the manufacturing process comprises the following steps: s1, simulating the clinical construction of dental preparation volume data in different forms in the oral cavity; s2, importing the dental preparation data with different forms into a CAD system, and designing in the CAD system to obtain restoration design data; s3, according to the restoration design data, obtaining the final restoration through 3D printing wax pattern post-casting, CNC milling or SLM technology; s4, scanning the final restoration tissue plane by using a 3D scanner to obtain restoration tissue plane data; and S5, importing the prosthesis organization plane data, the dental preparation volume data and the prosthesis design data into Geomagic Studio software for fitting and registration, and calculating to obtain the suitability deviation of the dental prosthesis. The method and the system for testing the suitability deviation of the dental restoration CAD and the manufacturing process solve the problem that the suitability deviation of the dental restoration CAD and the manufacturing process cannot be tested in the prior art.
Description
Technical Field
The invention relates to the field of dental prosthesis manufacturing, in particular to a method and a system for testing the adaptability deviation of a dental prosthesis CAD and a manufacturing process.
Background
Conventionally, the suitability of a dental prosthesis has been widely regarded by researchers as a key index affecting the clinical life thereof. In practice, technicians often receive dental preparations of various morphologies, some of which seem to be poorly accepted. However, until now, whether it is a clinician or a technician in the laboratory, faced with the workflow of different machining techniques, it was still confusing or confusing how to design a dental preparation correctly.
Unlike traditional casting process to make dental prosthesis, the Selective Laser Melting (SLM) and Computer Numerical Control (CNC) milling technology combines two working flows of Computer Aided Design (CAD) and machining (CAM). Before the prosthesis processing and manufacturing, data from various sources are received, and then the prosthesis design is carried out by means of dental professional software, and the accuracy and repeatability of the final prosthesis can be influenced by the processes. Practice shows that different processing procedures or modes are important factors influencing the suitability of the restoration. Therefore, before the full digital production of the restoration, it is crucial to judge the role each step in the digital working flow plays in strengthening or weakening the suitability of the dental restoration. However, until now, there is no effective method and system for measuring the deviation of the suitability of the dental prosthesis by the processes of 3D wax pattern printing post-casting, CNC milling and SLM technology.
Disclosure of Invention
The invention provides a method and a system for testing the suitability deviation of a dental restoration CAD and a manufacturing process, which solve the problem that the suitability deviation of the dental restoration CAD and the manufacturing process cannot be tested in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention firstly provides a method for testing the suitability deviation of the dental restoration CAD and the manufacturing process, which comprises the following steps:
s1, simulating the clinical construction of dental preparation volume data in different forms in the oral cavity;
s2, importing the dental preparation data with different forms into a CAD system, and designing in the CAD system to obtain restoration design data;
s3, according to the restoration design data, obtaining the final restoration through 3D printing wax pattern post-casting, CNC milling or SLM technology;
s4, scanning the final restoration tissue plane by using a 3D scanner to obtain restoration tissue plane data;
and S5, importing the prosthesis organization plane data, the dental preparation volume data and the prosthesis design data into Geomagic Studio software for fitting and registration, and calculating to obtain the suitability deviation of the dental prosthesis.
Preferably, step S3 includes the steps of:
s31, importing restoration design data into a CAM system, and cutting the soft metal disc or the oxide ceramic disc by the CAM system according to the restoration design data by adopting a CNC milling technology to obtain an initial restoration;
s32, sintering the initial prosthesis in a heat treatment furnace to obtain a prosthesis finished product;
s33, cooling the prosthesis finished product to room temperature, and then using 50 mu mAl in a sand blasting machine2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
Preferably, step S3 includes the steps of:
s31', importing the restoration design data into a CAM system, and cutting the hard metal disc by the CAM system according to the restoration design data by adopting a CNC milling technology to obtain a restoration finished product;
s32', placing the prosthesis finished product in a sand blasting machine with 50 mu mAl2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
Preferably, step S3 includes the steps of:
s31', importing the restoration design data model into a 3D printer, and printing a wax pattern resin material into a restoration wax pattern;
s32', placing the prosthesis wax pattern into a 75 ℃ heat treatment furnace to keep for 15min to remove the support;
s33', shaking the prosthesis wax pattern in an ultrasonic cleaner filled with vegetable oil at 60 deg.C for 10min, and cleaning;
s34', casting the embedding material with phosphate by adopting dental 3D printing resin wax under the condition of room temperature, wherein the ratio of 100 g: placing the embedded wax pattern in an oven in a case with 24ml of powder-liquid ratio than the embedded prosthesis wax pattern, and melting the wax pattern into a cavity at high temperature to obtain an embedded ring with the cavity;
s35', after the embedding material is solidified, placing the embedding ring in a muffle furnace at 750 ℃ for roasting;
s36', casting the dental alloy into a restoration body with a defect-free surface in a full-automatic digital intelligent casting machine;
s37', after cooling the restoration to room temperature, in a sand blasting machine, with 50. mu. mAl2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
Preferably, step S3 includes the steps of:
s31' ″, sending the prosthesis design data model to the SLM device equipped with the fiber laser;
s32' printing the restoration body according to the data model of the tooth preparation body under the protection of nitrogen by using metal powder with the diameter of 10-45 mu m as a raw material, wherein the printing parameters are as follows: composing according to the condition that the tissue surface of the prosthesis faces upwards and forms 90 degrees with the plane of the structural plate, wherein Yb is 100W of YAG fiber laser, and the diameter of a focus is 50 mu m; wavelength 1070 nm; the thickness of the laser melting layer is 25 mu m;
s33' ″, heat-treating the prosthesis in a muffle furnace after printing and forming, wherein the heat-treating process is as follows: under the protection of argon, gradually heating from room temperature to 960 ℃ for 4h, maintaining for 1h, cooling to room temperature, and finally removing the support structure by using a wire cutting machine;
s34' ″, after cooling the prosthesis to room temperature, in a sand blasting machine with 50. mu.mAl2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
The invention also provides a system for testing the suitability deviation of the dental restoration CAD and the manufacturing process, which comprises the following steps: the computer is used for calculating to obtain the suitability deviation according to the data model of the tooth preparation body and the tissue surface data of the final restoration body.
Preferably, the 3D scanner includes: a scanning base and a scanner;
the scanning base is used for connecting the final restoration body through viscose;
the scanner includes: the scanning box is internally provided with a scanning executing part and a driving part, the driving part is connected with the scanning base, the driving base is used for driving the scanning base with the final prosthesis to move, the scanning executing part is positioned above the driving part, and the scanning executing part is used for scanning the tissue surface of the final prosthesis positioned on the mounting base.
Preferably, the 3D scanner further comprises: and the auxiliary placing device is used for assisting the prosthesis to be placed on the scanning base and keeping the in-place channel of the prosthesis in the vertical direction.
Preferably, the auxiliary placement device includes: supporting seat, grudging post, leading wheel, suspend rope and pituitary in midair, the supporting seat is used for placing the scanning base, has found the grudging post on the supporting seat, installs the leading wheel that can rotate on the grudging post, has walked around on the leading wheel and has suspended the rope in midair, suspends the rope in midair and has lain in the pituitary that scans the base top on the supporting seat.
Compared with the prior art, the invention has the following beneficial effects:
the method realizes calculation of the suitability deviation between the actually manufactured final restoration and the tooth preparation body and restoration design data, detects the suitability deviation of the final restoration obtained by different shapes of tooth preparation bodies and processing technologies, can provide judgment basis for selection of tooth preparation body design or manufacturing methods, thereby ensuring the production quality and efficiency of the tooth restoration, being convenient for judging which shape of tooth preparation body and processing technology needs to be improved, and providing scientific basis for continuous improvement of the production quality and efficiency of the tooth restoration.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a side view at a scanning base;
fig. 2 is a schematic view of the structure at the auxiliary placement device in the system for testing the CAD and manufacturing process suitability deviations of the dental restoration;
fig. 3 is a flow chart of a method of testing a dental restoration CAD and manufacturing process suitability deviation;
fig. 4 is a diagram showing an evaluation process of crown suitability deviation.
Reference numerals: the auxiliary placing device 1, the supporting seat 11, the stand 12, the guide wheel 13, the suspension rope 14, the pituitary body 15, the mounting groove body 16, the pushing device 17, the push rod 171, the roller 172, the connecting rod 173, the cushion block 174, the rotating handle 175, the limiting block 176, the blocking seat 18, the scanning base 2, the scanning disk 21, the chassis 22, the first partial sphere 23, the elastic limiting mechanism 24, the arc block 241, the moving rod 242, the spring 243, the mounting block 244, the supporting frame 25, the stand block 251, the supporting shell 252, the supporting block 26 and the second partial sphere 27.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the functions of the invention clearer and easier to understand, the invention is further explained by combining the drawings and the detailed implementation mode:
example 1:
as shown in fig. 4, the present embodiment proposes a method for testing the suitability deviation of the dental restoration CAD and the manufacturing process, comprising the steps of:
s1, simulating the clinical construction of dental preparation volume data in different forms in the oral cavity;
s2, importing the dental preparation data with different forms into a CAD system, and designing in the CAD system to obtain restoration design data;
s3, according to the restoration design data, obtaining the final restoration through 3D printing wax pattern post-casting, CNC milling or SLM technology;
s4, scanning the final restoration tissue plane by using a 3D scanner to obtain restoration tissue plane data;
and S5, importing the prosthesis organization plane data, the dental preparation volume data and the prosthesis design data into Geomagic Studio software for fitting and registration, and calculating to obtain the suitability deviation of the dental prosthesis. And performing dental prosthesis suitability deviation calculation on the prosthesis tissue plane data and the dental preparation volume data, and performing dental prosthesis suitability deviation calculation on the prosthesis tissue plane data and the prosthesis design data.
In order to obtain the final restoration, step S3 includes the following steps:
s31, importing restoration design data into a CAM system, and cutting a soft metal disc or an oxide ceramic disc (such as a zirconium oxide disc) by the CAM system according to the restoration design data by adopting a CNC milling technology to obtain an initial restoration;
s32, sintering the initial prosthesis in a heat treatment furnace to obtain a prosthesis finished product;
s33, cooling the prosthesis finished product to room temperature, and then using 50 mu mAl in a sand blasting machine2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
In order to realize the scanning of the final prosthesis tissue plane into the computer and ensure the scanning is clear, step S4 includes the following steps:
s41, placing the chassis 22 of the scanning base 2 in the installation groove body 16 of the auxiliary placement device 1; (the installation groove body 16 limits the chassis 22 to move freely on the supporting seat 11)
S42, pushing the push rod 171, so that the roller 172 on the push rod 171 slides into the mounting block 244 of the elastic rotation limiting mechanism 24, the cushion block 174 is inserted between the supporting block 26 and the chassis 22, and the limiting block 176 is screwed into the second blocking hole; (initially, the roller 172 first lowers the mounting block 244 of the elastic rotation limiting mechanism 24 to separate the arc block 241 from the second partial sphere 27, the elastic rotation limiting mechanism 24 releases the first partial sphere 23, and then the cushion block 174 is inserted between the support block 26 and the bottom plate 22 to rotate the scanning disk 21 to a position parallel to the horizontal plane, so as to ensure that the scanning disk 21 is on the horizontal plane when the final prosthesis is mounted, and the elastic rotation limiting mechanism 24 releases the second partial sphere 27 before the cushion block 174 is inserted, so as to avoid the damage to the arc block 241 and the second partial sphere 27 caused by the rotation of the second partial sphere 27 relative to the arc block 241 when the cushion block 174 is inserted)
S43, pressing the final restoration body on the scanning disc 21 through viscose; (in this step, it is slightly ensured that the final restoration is in a vertical position, so as to avoid the lack of adhesion caused by excessive adjustment. at this time, the scanning disk 21 is already supported by the supporting block 26, the cushion block 174 and the base plate 22, so that when the final restoration is pressed, the second partial sphere 27 is not freely rotated to damage the second partial sphere 27)
S44, pulling the push rod 171, and screwing the limiting block 176 into the first blocking hole; (at this time, the arc-shaped block 241 is still far away from the second partial sphere 27, and the cushion block 174 is far away from the gap between the supporting block 26 and the chassis 22, so that the first partial sphere 23 and the second partial sphere 27 can be adjusted to rotate as required)
S45, suspending the pituitary body 15 in the final restoration body on the scanning disc 21, rotating the scanning disc 21 to ensure that the pituitary body 15 can extend into the bottom of the final restoration body, and manually keeping the rotating angle of the scanning disc 21; (the pituitary 15 is slightly smaller than the dental preparation so that when the final restoration is positioned in the vertical direction with the site of the final restoration, the pituitary 15 is ensured to be inserted into the final restoration)
S46, pulling the push rod 171 to make the roller 172 move away from the mounting block 244, and the arc block 241 presses the second partial sphere 27 under the elastic force of the spring 243 to limit the random rotation of the scan disk 21;
s47, separating the chassis 22 from the mounting groove body 16, and placing the scanning base 2 with the final restoration on the driving part of the scanner; (magnet attracting the driving part is arranged on the chassis 22)
And S48, starting the scanner, driving the final restoration to rotate by the driving part, and scanning the final restoration on the driving part by the scanning executing part to obtain the restoration tissue surface data.
In order to facilitate the judgment of the suitability deviation result, step S5 includes the steps of:
s51, opening Geomagic Studio software, respectively importing restoration testing data and restoration reference data, wherein the reference restoration testing data is restoration organization surface data, and the data model of the tooth preparation body is restoration reference data or restoration design data;
s52, aligning the prosthesis test data with the prosthesis reference data, comprising the following steps: s521, clicking a best fit alignment option in a Geomagic Studio software toolbar; s522, setting object fixed reference data and floating test data; s523, firstly, applying 'fine adjustment only'; s524, automatically eliminating the deviation; s524, finally applying the 'alignment symmetry';
s53, performing 3D comparison on the prosthesis test data and the prosthesis reference data, wherein the method comprises the following steps: s531, selecting 3D comparison in a Geomagic Studio software toolbar, and setting objects as restoration reference data and restoration test data respectively; s532, then "3D deviation" is selected, maximum deviation: 0.56mm, critical angle: 45 degrees; s533, selecting the resolution to be the finest, and selecting the middle position for color selection; s534, finally clicking application;
s54, analyzing to obtain a suitability deviation: and after the 3D comparison and application, obtaining a registration difference image and a registration difference analysis result of the prosthesis test data and the prosthesis reference data, wherein the registration difference analysis result comprises a maximum distance, an average distance and a standard deviation, and judging a suitability deviation result by using the registration difference image and the registration difference analysis result.
In step S54, the step of determining the suitability deviation result using the registration difference map and the registration difference analysis result includes the following steps:
step S541, establishing an evaluation model:
wherein Y is the result of deviation of suitability, hmaxIs the maximum distance,
Is the mean distance, δ is the standard deviation; a is0，a1，a2，b1，b2，c1，c2Are all constants.
A professional technician can firstly carry out manual grading to obtain a suitability deviation result (quantized to 0 to 100 points), and the maximum distance h between the corresponding prosthesis test data and the prosthesis reference data is recordedmaxAverage distance of
And a standard deviation δ. Then obtaining the target by a large amount of experimental data and adopting quadratic fitting calculation
A in (a)0，a1，a2，b1，b2，c1，c2. Therefore, the result of the suitability deviation is quantized, and whether the obtained prosthesis is suitable for the prosthesis can be judged by seeing the numerical value of the result of the suitability deviation every time. Thus, it is not necessary to maintain the long termThe judgment result is greatly changed due to subjective consciousness of people due to the need of manual judgment, and meanwhile, the subsequent judgment is convenient.
Of course, the suitability deviation in step S4 may also be evaluated by root mean square RMS, which is calculated by the following formula:
in the formula, x1Data points i, x in a data model for a dental preparation2The data model of the data points i and n tooth preparation bodies in the prosthesis tissue surface data and the data points in the prosthesis tissue surface data are counted.
In order to conveniently and intuitively judge the suitability deviation (taking a crown prosthesis as an example), a three-dimensional image with colors (color deviation image for short) can be displayed through software to evaluate the suitability deviation degree of the prosthesis: the color section represents the adaptability deviation of the prosthesis, the positive deviation represents the distance away from the surface of the tooth preparation body, and the adhesion gap is simulated; negative deviations indicate inward distance from the dental preparation surface, and no bonding gaps are present. Thus, human eyes can visually judge the result of the suitability deviation.
In fig. 3, DES is dental crown prosthesis data obtained by CAD, and TES is dental crown tissue surface scanning data obtained by DES processing; REF is dental preparation reference data; DR is a matching state after the DES is worn in REF; TR is the matching state of TES after being worn in REF; DRI is the registration deviation graph of DES and REF; TDI is a registration deviation graph of TES and DES tissue surfaces; TRI is a registration deviation graph of TES and REF.
Example 2:
this example provides a system for testing the dental restoration CAD and the manufacturing process suitability deviation on the basis of example 1, which is matched with the method of example 1.
The embodiment provides a system for testing the suitability deviation of the dental restoration CAD and the manufacturing process, which comprises the following steps: the computer is used for calculating to obtain the suitability deviation according to the data model of the tooth preparation body and the tissue surface data of the final restoration body.
In order to design a 3D scanner with a simple structure and convenient use, the 3D scanner comprises: a scanning base 2 and a scanner (not shown); the scanning base 2 is used for connecting the final restoration body through viscose; the scanner includes: the scanning box is internally provided with a scanning executing part and a driving part, the driving part is connected with the scanning base 2, the driving base is used for driving the scanning base 2 with the final prosthesis to move, the scanning executing part is positioned above the driving part, and the scanning executing part is used for scanning the tissue surface of the final prosthesis positioned on the mounting base.
In order to ensure that the seating track (i.e.: centerline) of the final restoration mounted on the scanning base 2 is in the vertical direction, the 3D scanner further comprises: the auxiliary placing device 1 is used for assisting the prosthesis to be placed on the scanning base 2 and keeping the in-place channel of the prosthesis in the vertical direction after the prosthesis is placed on the scanning base 2. In order to ensure that the final restoration is scanned clearly, the in-place channel of the final restoration is required to be ensured to be positioned in the vertical direction, so that the problem that the final restoration has a reflection to cause that some places cannot be scanned clearly is avoided, and the finally obtained adaptability deviation result is influenced incorrectly. The design of the placement device 1 is assisted, facilitating the adjustment of the final restoration.
In order to design the auxiliary placing device 1 with simple structure and convenient use, the auxiliary placing device 1 comprises: the scanning device comprises a supporting seat 11, a stand 12, a guide wheel 13, a suspension rope 14 and a pituitary body 15, wherein the supporting seat 11 is used for placing the scanning base 2, the stand 12 is erected on the supporting seat 11, the rotatable guide wheel 13 is installed on the stand 12, the suspension rope 14 is wound on the guide wheel 13, and the pituitary body 15 which is positioned above the scanning base 2 on the supporting seat 11 is suspended by the suspension rope 14.
The scanning base 2 includes: the device comprises a scanning disc 21, a chassis 22, a first partial sphere 23, an elastic rotation limiting mechanism 24 and a support frame 25, wherein the support frame 25 is erected on the chassis 22, the rotatable first partial sphere 23 is mounted on the support frame 25, the first partial sphere 23 is connected with the scanning disc 21, the scanning disc 21 is used for bonding a final restoration, the elastic rotation limiting mechanism 24 is mounted between the first partial sphere 23 and the support frame 25, and the elastic rotation limiting mechanism 24 is used for limiting the rotation of the first partial sphere 23.
The support frame 25 includes: the vertical block 251 and the supporting shell 252, two sides of the supporting shell 252 are respectively installed on the chassis 22 through the vertical block 251, the supporting shell 252 is provided with an installation cavity, the inner wall of the installation cavity guides the first partial sphere 23 to rotate, the diameter of the top opening of the installation cavity of the diameter wall of the first partial sphere 23 is large, and the distance from the supporting shell 252 to the scanning disk 21 is relatively small, so that the rotation angle of the first partial sphere 23 in the supporting shell 252 is relatively small, and the first partial sphere 23 cannot be separated from the supporting shell 252.
Two support blocks 26 are disposed at the bottom of the scanning plate 21, and the two support blocks 26 are respectively disposed at two sides of the support frame 25.
An installation groove body 16 for installing a chassis 22 is installed on the support base 11.
The pushing device 17 is installed on the stand 12, the pushing device 17 is used for enabling the elastic rotation limiting mechanism 24 to release the first part of the sphere 23 and support the two supporting blocks 26, and adjusting one pushing device 17 can realize that the elastic rotation limiting mechanism 24 releases the first part of the sphere 23 and can also realize that the two supporting blocks 26 and the scanning disc 21 are supported, so that the scanning disc 21 can be stably supported when the final prosthesis is tightly pressed on the scanning disc 21 through viscose, and the elastic rotation limiting mechanism 24 can be prevented from being damaged due to the trend of rotation caused by extrusion force on the scanning disc 21.
The elastic rotation limiting mechanism 24 includes: an arc block 241, a moving rod 242, a spring 243 and a mounting block 244, wherein the second partial sphere 27 is mounted below the first partial sphere 23, the second partial sphere 27 is located at a point with the sphere center of the first partial sphere 23, the radius of the second partial sphere 27 is smaller than that of the first partial sphere 23, the second partial sphere 27 is located in the mounting cavity, the arc block 241 is arranged below the second partial sphere 27, the arc block 241 is used for limiting the rotation of the second partial sphere 27 through friction force, the arc block 241 is fixed to one end of the moving rod 242, the moving rod 242 penetrates through a supporting shell 252, the other end of the moving rod 242 is mounted to the mounting block 244, the mounting block 244 is fixed to one end of the spring 243, the other end of the spring 243 is fixed to the supporting shell 252, the arc block 241 can be kept pressed outside the second partial sphere 27 under the elastic force of the spring 243, and the mounting block 244 is used for acting with the pushing device 17.
In order to realize the function of the pushing device 17 (i.e. the function of stably supporting the scan disk 21 and avoiding the damage of the elastic limiting mechanism 24 due to the tendency of rotation caused by the pressing force on the scan disk 21 when the final restoration is pressed on the scan disk 21 by the adhesive), the pushing device 17 comprises: the push rod 171, the roller 172, the connecting rod 173 and the cushion block 174, the push rod 171 passes through the vertical frame 12, the push rod 171 can move in the horizontal direction relative to the vertical frame 12, the rotatable roller 172 is installed at one end of the push rod 171, the installation block 244 is provided with an extending hole for the push rod 171 to extend into, a guide surface and an extrusion surface are formed on the inner wall of the bottom of the extending hole, the position of the edge of the guide surface close to the vertical frame 12 is higher than the position of the edge of the guide surface away from the vertical frame 12, the edge of the guide surface away from the vertical frame 12 is connected to the extrusion surface, the extrusion surface is located on the horizontal plane, the extrusion surface and the guide surface are both used for being tangent to the roller 172, and when the roller 172 is located on the extrusion surface, the arc-shaped block 241 is both far away from the second partial sphere 27; the push rod 171 is connected to a pad 174 through a connecting rod 173, the pad 174 is supported between the base plate 22 and the supporting block 26, the scanning disk 21 is parallel to the horizontal plane when the pad 174 is located between the base plate 22 and the supporting block 26, the pad 174 is away from the supporting block 26 when the roller 172 is located on the side of the pressing surface close to the guide surface, and the push rod 171 cannot rotate relative to the stand 12.
The pushing device 17 further comprises: the vertical frame 12 is provided with a stop seat 18 on one side departing from the installation groove body 16, the stop seat 18 is positioned above the push rod 171, the bottom of the stop seat 18 is provided with a first stop hole and a second stop hole, the stop seat 176 is screwed in the first stop hole and the second stop hole, the first stop hole is positioned on one side departing from the installation groove body 16 of the second stop hole, the stop block 176 is fixed on the rotary handle 175, the rotary handle 175 is installed on one end of the push rod 171 departing from the installation groove body 16, the rotary handle 175 can rotate the push rod 171 to rotate, and when the stop block 176 on the push rod 171 is positioned on one side departing from the installation groove body 16 of the stop seat 18, the roller 172 on the push rod 171 is far away from the installation block 244; when the limiting block 176 is located in the first blocking hole, the elastic rotation limiting mechanism 24 releases the first partial sphere 23, and the cushion block 174 is far away from the supporting block 26; when the stop block 176 is located in the first stop hole, the elastic rotation limiting mechanism 24 releases the first partial sphere 23, and the pad block 174 is supported between the support block 26 and the chassis 22.
Firstly, in order to ensure that the scanning is clear, the opening of the final restoration is kept upward, and the position of the final restoration is in the vertical direction, so that the position of the final restoration needs to be adjusted; then, the flexibility of the viscose is generally used to adjust the position of the final restoration in the prior art, since the viscose also has the purpose of bonding the final restoration to the scanning disc 21 and needs to adjust the position of the final restoration, the final restoration needs to be tightly pressed on the viscose originally for good bonding strength, and the adjustment of the position of the final restoration needs gaps between the final restoration and the viscose in some places, which is very difficult to be achieved when the bonding strength is good and the positioning path of the final restoration is in the vertical direction, so that the scanning disc 21 is designed to be rotatable, the scanning disc 21 is mounted on the supporting shell 252 through the first part of spheres 23, the rotation of the scanning disc 21 at any angle is realized, the adjustment is convenient, the limitation of the first part of spheres 23 through the elastic limitation mechanism 24 is realized, and the position of the final restoration in space after adjustment is ensured not to change, the auxiliary placing device 1 is used for assisting in manually judging whether the final restoration body in-place channel is positioned in the vertical direction, so that convenience is provided; then, the rotation of the first partial sphere 23 is limited by the friction force between the arc block 241 and the second partial sphere 27, when the final restoration body is pressed on the scanning disc 21, the second partial sphere 27 tends to rotate, the second partial sphere 27 and the arc block 241 are worn due to the friction between the second partial sphere 27 and the arc block 241, the rotation limiting force degree of the elastic rotation limiting mechanism 24 is insufficient, in order to protect the elastic rotation limiting mechanism 24, the elastic rotation limiting mechanism 24 can be used for a long time, therefore, the cushion block 174 and the support block 26 are designed to act, in order to keep the scanning disc 21 stably supported by the support block 26, the cushion block 174 and the chassis 22, and the elastic rotation limiting mechanism 24 releases the second partial sphere 27 by pushing the push rod 171 before the cushion block 174 is inserted, so that the subsequent scanning disc 21 rotates to the position supported by the support block 26, the cushion block 174 and the chassis 22, the scanning disc 21 can be stably supported by the supporting block 26, the cushion block 174 and the chassis 22 by continuously pushing the push rod 171, and the elastic rotation limiting mechanism 24 can be released and the cushion block 174 can be inserted between the supporting block 26 and the chassis 22 by pushing the push rod 171, so that the operation is facilitated, and the operation efficiency is improved; finally, in order to stabilize the push rod 171 to a desired position, a rotation knob 175, a stopper 176, and the blocking seat 18 are designed.
Example 3:
this example is compared to example 1 with only a change in step S3, i.e. the way in which the final restoration is obtained.
Step S3 includes the following steps:
s31', importing the restoration design data into a CAM system, and cutting the hard metal disc by the CAM system according to the restoration design data by adopting a CNC milling technology to obtain a restoration finished product (the shape can be matched with a prepared body and directly used as an inner crown of a tooth without sintering and forming);
s32', placing the prosthesis finished product in a sand blasting machine with 50 mu mAl2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
Example 4:
this example is compared to example 1 with only a change in step S3, i.e. the way in which the final restoration is obtained.
Step S3 includes the following steps:
s31', importing the restoration design data model into a 3D printer, and printing a wax pattern resin material into a restoration wax pattern;
s32', placing the prosthesis wax pattern into a 75 ℃ heat treatment furnace to keep for 15min to remove the support;
s33', shaking the prosthesis wax pattern in an ultrasonic cleaner filled with vegetable oil at 60 deg.C for 10min, and cleaning;
s34', casting the embedding material with phosphate by adopting dental 3D printing resin wax under the condition of room temperature, wherein the ratio of 100 g: placing the embedded wax pattern in an oven in a case with 24ml of powder-liquid ratio than the embedded prosthesis wax pattern, and melting the wax pattern into a cavity at high temperature to obtain an embedded ring with the cavity;
s35', after the embedding material is solidified, placing the embedding ring in a muffle furnace at 750 ℃ for roasting;
s36', casting the dental alloy into a restoration body with a defect-free surface in a full-automatic digital intelligent casting machine;
s37', after cooling the restoration to room temperature, in a sand blasting machine, with 50. mu. mAl2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
Example 5:
in this embodiment, on the basis of embodiment 1, only step S3 is changed, and the prosthesis is obtained by the SLM technology, and other steps are not changed.
Step S3 includes the following steps:
s31' ″, sending the prosthesis design data model to the SLM device equipped with the fiber laser;
s32' printing the restoration body according to the data model of the tooth preparation body under the protection of nitrogen by using metal powder with the diameter of 10-45 mu m as a raw material, wherein the printing parameters are as follows: composing according to the condition that the tissue surface of the prosthesis faces upwards and forms 90 degrees with the plane of the structural plate, wherein Yb is 100W of YAG fiber laser, and the diameter of a focus is 50 mu m; wavelength 1070 nm; the thickness of the laser melting layer is 25 mu m;
s33' ″, heat-treating the prosthesis in a muffle furnace after printing and forming, wherein the heat-treating process is as follows: under the protection of argon, gradually heating from room temperature to 960 ℃ for 4h, maintaining for 1h, cooling to room temperature, and finally removing the supporting structure by using a wire cutting processing machine;
s34' ″, after cooling the prosthesis to room temperature, in a sand blasting machine with 50. mu.mAl2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A method for testing the suitability deviation of a dental restoration CAD and a manufacturing process, comprising the steps of:
s1, simulating the clinical construction of dental preparation volume data in different forms in the oral cavity;
s2, importing the dental preparation data with different forms into a CAD system, and designing in the CAD system to obtain restoration design data;
s3, according to the restoration design data, obtaining the final restoration through 3D printing wax pattern post-casting, CNC milling or SLM technology;
s4, scanning the final restoration tissue plane by using a 3D scanner to obtain restoration tissue plane data;
s5, importing the prosthesis organization plane data, the dental preparation volume data and the prosthesis design data into Geomagic Studio software for fitting and registration, and calculating to obtain the suitability deviation of the dental prosthesis;
the step S4 includes the following steps: s41, placing the chassis of the scanning base in the mounting groove body of the auxiliary placing device; s42, pushing the push rod to enable the roller on the push rod to slide into the mounting block of the elastic rotation limiting mechanism, inserting the cushion block between the supporting block and the chassis, and screwing the limiting block into the second blocking hole; s43, pressing the final restoration body on a scanning disc through viscose; s44, pulling the push rod, and screwing the limiting block into the first blocking hole; s45, suspending the pituitary to the final restoration body on the scanning disc, rotating the scanning disc to ensure that the pituitary can extend to the bottom of the final restoration body, and manually keeping the angle of the scanning disc after rotation; s46, pulling the push rod to make the roller far away from the mounting block, and pressing the second part of ball by the arc block under the elastic force of the spring to limit the scanning disc to rotate freely; s47, separating the chassis from the mounting groove body, and placing the scanning base with the final restoration on the driving part of the scanner; and S48, starting the scanner, driving the final restoration to rotate by the driving part, and scanning the final restoration on the driving part by the scanning executing part to obtain the restoration tissue surface data.
2. The method for testing dental restoration CAD and manufacturing process suitability deviation as recited in claim 1, wherein step S3 comprises the steps of:
s31, importing restoration design data into a CAM system, and cutting the soft metal disc or the oxide ceramic disc by the CAM system according to the restoration design data by adopting a CNC milling technology to obtain an initial restoration;
s32, sintering the initial prosthesis in a heat treatment furnace to obtain a prosthesis finished product;
s33, cooling the prosthesis finished product to room temperature, and then using 50 mu mAl in a sand blasting machine2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
3. The method for testing dental restoration CAD and manufacturing process suitability deviation as recited in claim 1, wherein step S3 comprises the steps of:
s31', importing the restoration design data into a CAM system, and cutting the hard metal disc by the CAM system according to the restoration design data by adopting a CNC milling technology to obtain a restoration finished product;
s32', placing the prosthesis finished product in a sand blasting machine with 50 mu mAl2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
4. The method for testing dental restoration CAD and manufacturing process suitability deviation as recited in claim 1, wherein step S3 comprises the steps of:
s31', importing the restoration design data model into a 3D printer, and printing a wax pattern resin material into a restoration wax pattern;
s32 '', placing the prosthesis wax pattern into a 75 ℃ heat treatment furnace for 15min to remove the support;
s33', shaking the prosthesis wax pattern in an ultrasonic cleaner filled with vegetable oil at 60 ℃ for 10min, and cleaning;
s34', casting the embedding material by phosphate for dental 3D printing resin wax under the condition of room temperature, wherein the ratio of 100 g: placing the embedded wax pattern in an oven in a case with 24ml of powder-liquid ratio than the embedded prosthesis wax pattern, and melting the wax pattern into a cavity at high temperature to obtain an embedded ring with the cavity;
s35 '', after the embedding material is solidified, placing the embedding ring in a muffle furnace at 750 ℃ for roasting;
s36', casting the dental alloy into a restoration body with a defect-free surface in a full-automatic digital intelligent casting machine;
s37 ″, cooling the prosthesis to room temperature, then spraying 50 μm Al on the surface of the prosthesis in a sand-blasting machine2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
5. The method for testing dental restoration CAD and manufacturing process suitability deviation as recited in claim 1, wherein step S3 comprises the steps of:
s31 ' ' ', sending the prosthesis design data model to the SLM device equipped with the fiber laser;
s32 ' ' ', printing the restoration body according to the data model of the tooth preparation body under the protection of nitrogen by using metal powder with the diameter of 10-45 mu m as a raw material, wherein the printing parameters are as follows: composing according to the condition that the tissue surface of the prosthesis faces upwards and forms 90 degrees with the plane of the structural plate, wherein Yb is 100W of YAG fiber laser, and the diameter of a focus is 50 mu m; wavelength 1070 nm; the thickness of the laser melting layer is 25 mu m;
s33 ' ' ', carrying out heat treatment in a muffle furnace after printing and forming the prosthesis, wherein the heat treatment process is as follows: under the protection of argon, gradually heating from room temperature to 960 ℃ for 4h, maintaining for 1h, cooling to room temperature, and finally removing the supporting structure by using a wire cutting processing machine;
s34 ' ' ', after cooling the restoration to room temperature, in a sand blasting machine with 50 mu mAl2O3And carrying out sand blasting treatment on the tissue surface for 30s under the condition of 0.5Mpa of particles to obtain the final restoration.
6. The method for testing dental restoration CAD and manufacturing process suitability deviation as recited in claim 1, wherein step S5 comprises the steps of:
s51, opening Geomagic Studio software, respectively importing restoration testing data and restoration reference data, wherein the reference restoration testing data is restoration organization surface data, and the dental preparation volume data model or restoration design data model is restoration reference data;
s52, aligning the prosthesis test data with the prosthesis reference data, comprising the following steps: s521, clicking a best fit alignment option in a Geomagic Studio software toolbar; s522, setting object fixed reference data and floating test data; s523, firstly, applying 'fine adjustment only'; s524, automatically eliminating the deviation; s524, finally applying the 'alignment symmetry';
s53, performing 3D comparison on the prosthesis test data and the prosthesis reference data, wherein the method comprises the following steps: s531, selecting 3D comparison in a Geomagic Studio software toolbar, and setting objects as restoration reference data and restoration test data respectively; s532, then "3D deviation" is selected, maximum deviation: 0.56mm, critical angle: 45 degrees; s533, selecting the resolution to be the finest, and selecting the middle position for color selection; s534, finally clicking application;
s54, analyzing to obtain a suitability deviation: and after the 3D comparison and application, obtaining a registration difference image and a registration difference analysis result of the prosthesis test data and the prosthesis reference data, wherein the registration difference analysis result comprises a maximum distance, an average distance and a standard deviation, and judging a suitability deviation result by using the registration difference image and the registration difference analysis result.
7. A system for testing dental restoration CAD and manufacturing process suitability deviations, comprising: the computer is used for calculating to obtain the suitability deviation according to the data model of the tooth preparation body and the tissue surface data of the final restoration body;
the 3D scanner includes: the device comprises a scanning base, a scanner and an auxiliary placing device; the scanning base is used for connecting the final restoration body through viscose; the scanner includes: the scanning box is internally provided with a scanning executing part and a driving part, the driving part is connected with a scanning base, the driving base is used for driving the scanning base with the final prosthesis to move, the scanning executing part is positioned above the driving part, and the scanning executing part is used for scanning the tissue surface of the final prosthesis positioned on the mounting base; the auxiliary placing device is used for assisting the prosthesis to be placed on the scanning base and keeping the in-place channel of the prosthesis in the vertical direction;
the auxiliary placing device comprises: the scanning device comprises a supporting seat, a vertical frame, a guide wheel, a suspension rope and a pituitary body, wherein the supporting seat is used for placing a scanning base, the vertical frame is vertically arranged on the supporting seat, the guide wheel capable of rotating is arranged on the vertical frame, the suspension rope is wound on the guide wheel, and the pituitary body positioned above the scanning base on the supporting seat is suspended by the suspension rope; the scanning base includes: the device comprises a scanning disc, a chassis, a first partial sphere, an elastic rotation limiting mechanism and a support frame, wherein the support frame is vertically arranged on the chassis, the first partial sphere capable of rotating is arranged on the support frame, the first partial sphere is connected with the scanning disc, the scanning disc is used for bonding a final restoration body, the elastic rotation limiting mechanism is arranged between the first partial sphere and the support frame, and the elastic rotation limiting mechanism is used for limiting the rotation of the first partial sphere; the support frame includes: the supporting shell is provided with an installation cavity, the inner wall of the installation cavity guides the first part of sphere to rotate, and the diameter of the first part of sphere is larger than that of an opening at the top of the installation cavity; the bottom of the scanning disc is provided with two supporting blocks which are respectively positioned at two sides of the supporting frame; an installation groove body used for installing the chassis is installed on the supporting seat; and a pushing device is arranged on the stand and used for enabling the elastic rotation limiting mechanism to release the first part of the sphere and support the two supporting blocks.
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| CN105930615B (en) * | 2016-05-12 | 2019-07-26 | 中国人民解放军第四军医大学 | The flowing transportation work station of CAD-CAM-3D print system and mouth mending material is processed automatically |
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