CN117100437A - Color matching preparation method of color-changing denture - Google Patents
Color matching preparation method of color-changing denture Download PDFInfo
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- CN117100437A CN117100437A CN202211671290.3A CN202211671290A CN117100437A CN 117100437 A CN117100437 A CN 117100437A CN 202211671290 A CN202211671290 A CN 202211671290A CN 117100437 A CN117100437 A CN 117100437A
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0004—Computer-assisted sizing or machining of dental prostheses
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0006—Production methods
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/08—Artificial teeth; Making same
- A61C13/082—Cosmetic aspects, e.g. inlays; Determination of the colour
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/34—Making or working of models, e.g. preliminary castings, trial dentures; Dowel pins [4]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
- A61K6/831—Preparations for artificial teeth, for filling teeth or for capping teeth comprising non-metallic elements or compounds thereof, e.g. carbon
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
- A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
- A61K6/887—Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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Abstract
The application belongs to the technical field of denture preparation, and provides a color matching preparation method of a color-changing denture, which comprises the steps of obtaining a dental crown image; preparing a color-changing denture; color matching is performed on the color-changed denture according to the dental crown image to obtain a matched denture. When ultraviolet light irradiates the color-changing denture, the color-changing denture is adaptively adjusted to adapt to the adjacent teeth according to the color depth change trend of gradual change of the teeth, so that the color difference between the prepared color-changing denture and the adjacent teeth is minimum, the color state conversion calculation time can be accurately judged, the irradiation stopping time period is approximately shortened, the irradiation time period is slightly prolonged to improve the stability of the color state substance with the minimum color difference with the adjacent teeth, the actual use requirement can be met, and the photochromic material is more stable in the color state with the minimum color difference with the adjacent teeth.
Description
Technical Field
The application belongs to the technical field of denture preparation and intelligent manufacturing, and particularly relates to a color matching preparation method of a color-changing denture.
Background
Currently, in order to make the surface color of the denture (denture) attractive, the demand for the color-changing denture is increasing, and the color-changing denture is generally prepared by adopting a photochromic material, wherein the photochromic material shows reversible photoisomerization when irradiated by light with a proper wavelength, and the photochromic material refers to a photochromic compound which can generate photochemical reaction when a compound A is irradiated by light with a certain wavelength to obtain a product B, and the colors (namely the absorption of light) of the product B and the product A are obviously different, such as the photochromic compound in the patent of the application disclosed in CN 114767549A. The product B can be recovered to the original form A under the irradiation of another beam of light or by heating. Photochromic is a reversible chemical reaction, a material that changes color when excited by a light source.
However, in the case of manufacturing a dental prosthesis, because of the reversible process in which the absorption spectrum of a photochromic material changes after the compound is irradiated with light, the color-changing dental prosthesis is generally changed in 2 or more states, for example, between the compound a and the product B, and one of the states is necessarily completely different from the original dental color when the dental color is changed, and the color-changing method for the dental prosthesis is feasible because many color-changing materials generally require a coloring or fading time as long as several minutes or hours.
Disclosure of Invention
The application aims to provide a color matching preparation method of a color-changing denture, which aims to solve one or more technical problems in the prior art and at least provides a beneficial selection or creation condition.
In order to achieve the above purpose, the application provides a color matching preparation method of a color-changing denture, which specifically comprises the following steps:
s1, acquiring a dental crown image;
s2, preparing a color-changing denture;
and S3, color matching is carried out on the color-changed false teeth according to the dental crown image, and the color-matched false teeth are obtained.
Further, in S1, the acquiring of the dental crown image is to take a picture of the dental crown of the patient by a dental camera, an intraoral camera, a CCD camera or a digital camera to acquire the dental crown image.
Further, in S2, the method of preparing a color-changing denture includes:
collecting three-dimensional data of a plaster cast or a dental impression of a patient's mouth by an extraoral scanner;
or directly scanning three-dimensional data of the oral cavity of the patient by an intraoral scanner to obtain the three-dimensional data of the oral cavity of the patient;
designing a denture mould according to the three-dimensional data of the oral cavity of a patient, transmitting the denture mould to a 3D printer, and printing to obtain a printed denture mould;
grinding the printed denture mould through a grinder according to the three-dimensional data of the oral cavity of the patient to obtain a denture mould;
the color-changing denture is prepared by injecting denture material into denture mold.
Wherein the denture material comprises a dental filler and a photosensitive resin material;
the weight percentage of the dental filler is 0-70wt%; the weight percentage of the photosensitive resin material is 30-100wt%;
the dental filler comprises: any one or a combination of a plurality of zirconia, silica, titanium dioxide and polyethyl methacrylate; the particle size range of the dental filler is 3-25 mu m;
the photosensitive resin material comprises acrylate resin or photo-curing resin, photo-curing agent, benzophenone, 2, 6-di-tert-butyl-p-cresol, ultraviolet absorbent and photochromic material; (wherein, the acrylic resin is polymerizable acrylic resin, the light curing agent can cause the unsaturated olefinic bonds contained in the acrylic resin to generate a composite material with mechanical property and strength through polymerization reaction under the action of illumination, and the light curing agent absorbs energy with certain illumination wavelength to generate a large number of free radicals so as to trigger the unsaturated olefinic bonds in the acrylic resin to generate addition polymerization reaction). The photo-curing agent is any one of benzophenone, 2, 4-dihydroxybenzophenone and alpha-diketone.
The photochromic material is any one of diaryl ethylene compound, 1, 2-bis (2, 4-dimethyl-5-phenyl-3-thienyl) -3, 4, 5-hexafluorocyclopentene, triarylmethane compound and spiropyran photochromic compound. (wherein the photochromic mechanism of the photochromic materials is a cyclizing reaction, namely, under the excitation of ultraviolet light, the diaryl ethylene compound rotates to form a colored closed ring body, the closed ring body can change reversely under the irradiation of visible light, and the structure of the closed ring body changes after illumination, so that the color of the closed ring body changes.
Preferably, in S2, the method of preparing a color-changing denture includes: any of the methods disclosed in publication No. CN104983477B, CN112430074A, CN112223749B, wherein the material of the color-changing denture comprises any of the materials of CN114767549A, CN114767549A, CN105167869A, CN105832563a, wherein the material of the color-changing denture comprises a photochromic material.
Because the photochromic material in the color-changing denture needs to be irradiated by ultraviolet light for a certain time, the photochromic material is changed into a colored state. The irradiation process gradually changes the color of the photochromic material to change the color, the color can change along with the irradiation time of ultraviolet light, the longer the ultraviolet light irradiates the color changing denture, the more the photochromic material becomes colored, and the darker the color, but if the color is too dark, the color may not match with the adjacent teeth (the adjacent teeth are adjacent to the position of the color changing denture to be installed), so the following scheme is needed to control the irradiation time of the ultraviolet light to gradually match the color depth of the color changing denture with the adjacent teeth:
further, in S3, the method of color matching a color-changing denture according to a crown image to obtain a color-matched denture includes:
irradiating the surface of the color-changing denture with ultraviolet light with the wavelength range of 150 nm-350 nm; (diarylethenes in photochromic materials, 1, 2-bis (2, 5-dimethylthiophen-3-yl) perfluorocyclopentene makes the color-changing denture appear pink, 1, 2-bis (2, 4-dimethyl-5-phenyl-3-thienyl) -3, 4, 5-hexafluoro-1-cyclopentene shows blue after ultraviolet irradiation, and ultraviolet irradiation is carried out on the photochromic materials in the color-changing denture for a certain time to change the photochromic materials into a colored state, wherein the condition is reversible, and the photochromic materials in the colored state can be changed into the colorless state by irradiation of visible light with a certain time more than 400nm in the clinical use process.
Dividing the reference image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas by taking the dental crown image as a reference image, and marking gray level images of image areas of 2 adjacent teeth in each image area of the reference image as 2 adjacent tooth images (screening out image areas of teeth of a patient in the reference image); the average value of Gray values of all pixel points in the 2 adjacent tooth images is Gray1 and Gray2 respectively, and the absolute value of the difference value between Gray1 and Gray2 is GrayGap;
acquiring an image of the color-changing denture as a target image in real time through a CCD camera, so that the time for starting ultraviolet irradiation on the surface of the color-changing denture is T0; the CCD camera obtains the interval duration of the target image as time1;
dividing a target image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas, and marking gray level images of the image areas of the color-changing false teeth in each image area of the target image as false tooth images; (if the average gray value of the image area is within the range of the preset gray value, the image area is a false tooth sub-image), or the gray image of the image area of the color-changing false tooth in the target image is identified as a false tooth image by a YOLO target detection algorithm;
acquiring denture images in real time from the time T0, and if the average Gray (TC) of Gray values of all pixels in the denture images at the current time TC is monitored to meet the condition: when the grade (TC) -Mean (Gray 1, gray 2) is less than or equal to GrayGap, stopping ultraviolet light to irradiate the surface of the color-changing denture, so as to obtain the color-matched denture; wherein Mean (Gray 1, gray 2) is the average of Gray1 and Gray 2.
The beneficial effects are as follows: when ultraviolet light irradiates the color-changing denture, the color-changing denture is self-adaptively adjusted to adapt to the adjacent teeth according to the color depth change trend of gradual change of the tooth color, so that the color difference between the prepared color-changing denture and the adjacent teeth is minimized.
Although the above scheme can minimize the color difference of the color-changing denture and the color difference of the adjacent teeth, after illumination is stopped, the color of the color-changing denture can be changed along with the change of the color of the denture caused by ultraviolet light, and the color state can be changed into the colorless state after the photochromic material is changed into the colored state, so that the stability of the colored state substance with the smallest color difference of the adjacent teeth can be improved by slightly increasing the irradiation time length on the scheme, the practical use requirement can be met, the photochromic material is more stable in the colored state with the smallest color difference, the required time for changing the colored state into the colorless state can be prolonged, the practical use time for re-illumination color adjustment can be prolonged, and the following preferable scheme is provided for meeting the above requirement:
preferably, in S3, the method of color matching a color-changing denture according to a crown image to obtain a color-matched denture includes:
irradiating the surface of the color-changing denture with ultraviolet light with the wavelength range of 150 nm-350 nm;
dividing the reference image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas by taking the dental crown image as a reference image, and marking gray level images of image areas of 2 adjacent teeth in each image area of the reference image as 2 adjacent tooth images (screening out image areas of teeth of a patient in the reference image); the average value of Gray values of all pixel points in the 2 adjacent tooth images is Gray1 and Gray2 respectively, and the absolute value of the difference value between Gray1 and Gray2 is GrayGap;
acquiring an image of the color-changing denture as a target image in real time through a CCD camera, so that the time for starting ultraviolet irradiation on the surface of the color-changing denture is T0; the CCD camera obtains the interval duration of the target image as time1;
dividing a target image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas, and marking gray level images of the image areas of the color-changing false teeth in each image area of the target image as false tooth images; (if the average gray value of the image area is within the range of the preset gray value, the image area is a false tooth sub-image), or the gray image of the image area of the color-changing false tooth in the target image is identified as a false tooth image by a YOLO target detection algorithm;
acquiring denture images in real time from the time T0, and if the average Gray (TC) of Gray values of all pixels in the denture images at the current time TC is monitored to meet the condition: when the grade (TC) -Mean (grade 1, grade 2) grade is less than or equal to grade gap, calculating the next color state conversion calculation time tNext at the current moment TC:
alternatively, tnext=ttcurrent+tmaxgray×pat;
PAT＝GaryG(TC-i×time1)/TGrayAVE；
taking all collected denture image formation sequences Map1 from the time T0 to the current time TC-time1, recording the average value of Gray values of all pixels of the denture images as MaAVE, and screening all denture image formation sequences Map2 with the absolute value of the difference value between each MaAVE and Gray (TC) in the sequences Map1 being smaller than or equal to GrayGap;
then tturrent is the acquisition instant of the denture image in a sequence Map2 closest to the current instant TC; or, tturrent is a collection time of a denture image nearest to the current time TC, which satisfies that an average value of all Gray values is less than or equal to |gray (TC) -Gray (TC-time 1) |;
TMaxGray is the maximum value of the interval duration between every two adjacent denture image acquisition moments in the sequence Map2;
TGrayAVE is an average value of interval duration between every two adjacent denture image acquisition moments in sequence Map2;
wherein i is a variable, N is the number of denture images in the sequence Map2, and PAT is a gradient color difference ratio;
GaryG (TC-i×time 1) is the i-th gradient color difference interval, and the calculation method of GaryG (TC-i×time 1) is as follows: taking the acquisition time of the false tooth image in a sequence Map2 which is closest to the time TC-i multiplied by 1 in the reverse time sequence direction and meets the condition that the average value of all Gray values is less than or equal to |Gray (TC) -Gray (TC-time 1) | as T1, and taking the GaryG (TC-i multiplied by 1) as the time from the time T1 to the time TC-i multiplied by 1;
wherein Gray (TC-time 1) is the average value of Gray values of all pixels in the denture image at the moment of TC-time 1;
wherein Mean (Gray 1, gray 2) is the average of Gray1 and Gray 2;
continuing to irradiate the surface of the color-changing denture with ultraviolet light from the current moment TC, and stopping irradiating the surface of the color-changing denture with ultraviolet light to obtain a color-matched denture if the average value of gray values of all pixels of the obtained denture image is smaller than or equal to GrayGap within the calculation time tNext from TC to the color state; otherwise, stopping irradiating ultraviolet light on the surface of the color-changing denture to obtain the color-matched denture when the color state conversion calculation time tNext is reached.
The beneficial effects are that: according to the scheme, the color state conversion calculation time can be accurately judged, the irradiation is stopped for a period of time, so that the irradiation time is slightly prolonged to improve the stability of the color state substance with the smallest adjacent tooth color difference, the actual use requirement can be met, and the photochromic material is more stable in the color state with the smallest adjacent tooth color difference.
Wherein, the ultraviolet light with the wavelength range of 150 nm-350 nm irradiates the surface of the color-changing denture: the surface of the color-changing denture is irradiated by any one of a high-pressure mercury lamp, a high-pressure metal halogen lamp, a plate burning lamp, a capillary ultra-high pressure mercury lamp, an optical cleaning lamp, a lamp special for optical discs, an ultraviolet iron lamp, a sterilizing lamp, a short-arc xenon lamp, and an excimer discharge lamp.
The application also provides a color matching preparation system of the color-changing denture, which comprises the following steps: a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor implements steps in the color matching preparation method of the color changing denture when the computer program is executed, the color matching preparation system of the color changing denture can be operated in a computing device such as a desktop computer, a notebook computer, a palm computer and a cloud data center, and the executable system can comprise, but is not limited to, a processor, a memory and a server cluster, and the processor executes the computer program to be operated in a unit of the following system:
an image acquisition unit for acquiring a crown image;
and the color matching unit is used for matching colors of the color-changing false teeth according to the dental crown image.
The beneficial effects of the application are as follows: the color matching preparation method of the color-changing denture has the beneficial effects that: when ultraviolet light irradiates the color-changing denture, the color-changing denture is adaptively adjusted to adapt to the adjacent teeth according to the color depth change trend of gradual change of the teeth, so that the color difference between the prepared color-changing denture and the adjacent teeth is minimum, the color state conversion calculation time can be accurately judged, the irradiation stopping time period is approximately shortened, the irradiation time period is slightly prolonged to improve the stability of the color state substance with the minimum color difference with the adjacent teeth, the actual use requirement can be met, and the photochromic material is more stable in the color state with the minimum color difference with the adjacent teeth.
Drawings
The above and other features of the present application will become more apparent from the detailed description of the embodiments thereof given in conjunction with the accompanying drawings, in which like reference characters designate like or similar elements, and it is apparent that the drawings in the following description are merely some examples of the present application, and other drawings may be obtained from these drawings without inventive effort to those of ordinary skill in the art, in which:
FIG. 1 is a flow chart of a method of color formulation preparation of a color-changing dental prosthesis;
fig. 2 is a block diagram of a color preparation system for color-changing dental prostheses.
Detailed Description
The conception, specific structure, and technical effects produced by the present application will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, aspects, and effects of the present application. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The same reference numbers will be used throughout the drawings to refer to the same or like parts.
Referring to fig. 1, which is a flowchart illustrating a color matching preparation method of a color-changing dental prosthesis according to the present application, a color matching preparation method of a color-changing dental prosthesis according to an embodiment of the present application will be described in detail with reference to fig. 1. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the application or its applications.
S1, acquiring a dental crown image;
s2, preparing a color-changing denture;
and S3, color matching is carried out on the color-changed false teeth according to the dental crown image, and the color-matched false teeth are obtained.
Further, in S1, the acquiring of the dental crown image is to take a picture of the dental crown of the patient by a dental camera, an intraoral camera, a CCD camera or a digital camera to acquire the dental crown image.
Further, in S2, the method of preparing a color-changing denture includes:
collecting three-dimensional data of a plaster cast or a dental impression of a patient's mouth by an extraoral scanner;
or directly scanning three-dimensional data of the oral cavity of the patient by an intraoral scanner to obtain the three-dimensional data of the oral cavity of the patient;
designing a denture mould according to the three-dimensional data of the oral cavity of a patient, transmitting the denture mould to a 3D printer, and printing to obtain a printed denture mould;
grinding the printed denture mould through a grinder according to the three-dimensional data of the oral cavity of the patient to obtain a denture mould;
the color-changing denture is prepared by injecting denture material into denture mold.
Wherein the denture material comprises a dental filler and a photosensitive resin material;
the weight percentage of the dental filler is 0-70wt%; the weight percentage of the photosensitive resin material is 30-100wt%;
the dental filler comprises: any one or a combination of a plurality of zirconia, silica, titanium dioxide and polyethyl methacrylate; the particle size range of the dental filler is 3-25 mu m;
the photosensitive resin material comprises acrylate resin or photo-curing resin, photo-curing agent, benzophenone, 2, 6-di-tert-butyl-p-cresol, ultraviolet absorbent and photochromic material; (wherein, the acrylic resin is polymerizable acrylic resin, the light curing agent can cause the unsaturated olefinic bonds contained in the acrylic resin to generate a composite material with mechanical property and strength through polymerization reaction under the action of illumination, and the light curing agent absorbs energy with certain illumination wavelength to generate a large number of free radicals so as to trigger the unsaturated olefinic bonds in the acrylic resin to generate addition polymerization reaction). The photo-curing agent is any one of benzophenone, 2, 4-dihydroxybenzophenone and alpha-diketone.
The photochromic material is any one of diaryl ethylene compound, 1, 2-bis (2, 4-dimethyl-5-phenyl-3-thienyl) -3, 4, 5-hexafluorocyclopentene, triarylmethane compound and spiropyran photochromic compound. (wherein the photochromic mechanism of the photochromic materials is a cyclizing reaction, namely, under the excitation of ultraviolet light, the diaryl ethylene compound rotates to form a colored closed ring body, the closed ring body can change reversely under the irradiation of visible light, and the structure of the closed ring body changes after illumination, so that the color of the closed ring body changes.
Preferably, in S2, the method of preparing a color-changing denture includes: any of the methods disclosed in publication No. CN104983477B, CN112430074A, CN112223749B, wherein the material of the color-changing denture comprises any of the materials of CN114767549A, CN114767549A, CN105167869A, CN105832563a, wherein the material of the color-changing denture comprises a photochromic material.
Because the photochromic material in the color-changing denture needs to be irradiated by ultraviolet light for a certain time, the photochromic material is changed into a colored state. The irradiation process gradually changes the color of the photochromic material to change the color, the color can change along with the irradiation time of ultraviolet light, the longer the ultraviolet light irradiates the color changing denture, the more the photochromic material becomes colored, and the darker the color, but if the color is too dark, the color may not match with the adjacent teeth (the adjacent teeth are adjacent to the position of the color changing denture to be installed), so the following scheme is needed to control the irradiation time of the ultraviolet light to gradually match the color depth of the color changing denture with the adjacent teeth:
further, in S3, the method of color matching a color-changing denture according to a crown image to obtain a color-matched denture includes:
irradiating the surface of the color-changing denture with ultraviolet light with the wavelength range of 150 nm-350 nm; (diarylethenes in photochromic materials, 1, 2-bis (2, 5-dimethylthiophen-3-yl) perfluorocyclopentene makes the color-changing denture appear pink, 1, 2-bis (2, 4-dimethyl-5-phenyl-3-thienyl) -3, 4, 5-hexafluoro-1-cyclopentene shows blue after ultraviolet irradiation, and ultraviolet irradiation is carried out on the photochromic materials in the color-changing denture for a certain time to change the photochromic materials into a colored state, wherein the condition is reversible, and the photochromic materials in the colored state can be changed into the colorless state by irradiation of visible light with a certain time more than 400nm in the clinical use process.
Dividing the reference image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas by taking the dental crown image as a reference image, and marking gray level images of image areas of 2 adjacent teeth in each image area of the reference image as 2 adjacent tooth images (screening out image areas of teeth of a patient in the reference image); the average value of Gray values of all pixel points in the 2 adjacent tooth images is Gray1 and Gray2 respectively, and the absolute value of the difference value between Gray1 and Gray2 is GrayGap;
acquiring an image of the color-changing denture as a target image in real time through a CCD camera, so that the time for starting ultraviolet irradiation on the surface of the color-changing denture is T0; the CCD camera obtains the interval duration of the target image as time1;
dividing a target image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas, and marking gray level images of the image areas of the color-changing false teeth in each image area of the target image as false tooth images; (if the average gray value of the image area is within the range of the preset gray value, the image area is a false tooth sub-image), or the gray image of the image area of the color-changing false tooth in the target image is identified as a false tooth image by a YOLO target detection algorithm;
acquiring denture images in real time from the time T0, and if the average Gray (TC) of Gray values of all pixels in the denture images at the current time TC is monitored to meet the condition: when the grade (TC) -Mean (Gray 1, gray 2) is less than or equal to GrayGap, stopping ultraviolet light to irradiate the surface of the color-changing denture, so as to obtain the color-matched denture; wherein Mean (Gray 1, gray 2) is the average of Gray1 and Gray 2.
The beneficial effects are as follows: when ultraviolet light irradiates the color-changing denture, the color-changing denture is self-adaptively adjusted to adapt to the adjacent teeth according to the color depth change trend of gradual change of the tooth color, so that the color difference between the prepared color-changing denture and the adjacent teeth is minimized.
Although the above scheme can minimize the color difference of the color-changing denture and the color difference of the adjacent teeth, after illumination is stopped, the color of the color-changing denture can be changed along with the change of the color of the denture caused by ultraviolet light, and the color state can be changed into the colorless state after the photochromic material is changed into the colored state, so that the stability of the colored state substance with the smallest color difference of the adjacent teeth can be improved by slightly increasing the irradiation time length on the scheme, the practical use requirement can be met, the photochromic material is more stable in the colored state with the smallest color difference, the required time for changing the colored state into the colorless state can be prolonged, the practical use time for re-illumination color adjustment can be prolonged, and the following preferable scheme is provided for meeting the above requirement:
preferably, in S3, the method of color matching a color-changing denture according to a crown image to obtain a color-matched denture includes:
irradiating the surface of the color-changing denture with ultraviolet light with the wavelength range of 150 nm-350 nm;
dividing the reference image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas by taking the dental crown image as a reference image, and marking gray level images of image areas of 2 adjacent teeth in each image area of the reference image as 2 adjacent tooth images (screening out image areas of teeth of a patient in the reference image); the average value of Gray values of all pixel points in the 2 adjacent tooth images is Gray1 and Gray2 respectively, and the absolute value of the difference value between Gray1 and Gray2 is GrayGap;
acquiring an image of the color-changing denture as a target image in real time through a CCD camera, so that the time for starting ultraviolet irradiation on the surface of the color-changing denture is T0; the CCD camera obtains the interval duration of the target image as time1;
dividing a target image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas, and marking gray level images of the image areas of the color-changing false teeth in each image area of the target image as false tooth images; (if the average gray value of the image area is within the range of the preset gray value, the image area is a false tooth sub-image), or the gray image of the image area of the color-changing false tooth in the target image is identified as a false tooth image by a YOLO target detection algorithm;
acquiring denture images in real time from the time T0, and if the average Gray (TC) of Gray values of all pixels in the denture images at the current time TC is monitored to meet the condition: when the grade (TC) -Mean (grade 1, grade 2) grade is less than or equal to grade gap, calculating the next color state conversion calculation time tNext at the current moment TC:
alternatively, tnext=ttcurrent+tmaxgray×pat;
PAT＝GaryG(TC-i×time1)/TGrayAVE；
taking all collected denture image formation sequences Map1 from the time T0 to the current time TC-time1, recording the average value of Gray values of all pixels of the denture images as MaAVE, and screening all denture image formation sequences Map2 with the absolute value of the difference value between each MaAVE and Gray (TC) in the sequences Map1 being smaller than or equal to GrayGap;
then tturrent is the acquisition instant of the denture image in a sequence Map2 closest to the current instant TC; or, tturrent is a collection time of a denture image nearest to the current time TC, which satisfies that an average value of all Gray values is less than or equal to |gray (TC) -Gray (TC-time 1) |;
TMaxGray is the maximum value of the interval duration between every two adjacent denture image acquisition moments in the sequence Map2;
TGrayAVE is an average value of interval duration between every two adjacent denture image acquisition moments in sequence Map2;
wherein i is a variable, N is the number of denture images in the sequence Map2, and PAT is a gradient color difference ratio;
GaryG (TC-i×time 1) is the i-th gradient color difference interval, and the calculation method of GaryG (TC-i×time 1) is as follows: taking the acquisition time of the false tooth image in a sequence Map2 which is closest to the time TC-i multiplied by 1 in the reverse time sequence direction and meets the condition that the average value of all Gray values is less than or equal to |Gray (TC) -Gray (TC-time 1) | as T1, and taking the GaryG (TC-i multiplied by 1) as the time from the time T1 to the time TC-i multiplied by 1;
wherein Gray (TC-time 1) is the average value of Gray values of all pixels in the denture image at the moment of TC-time 1;
wherein Mean (Gray 1, gray 2) is the average of Gray1 and Gray 2;
continuing to irradiate the surface of the color-changing denture with ultraviolet light from the current moment TC, and stopping irradiating the surface of the color-changing denture with ultraviolet light to obtain a color-matched denture if the average value of gray values of all pixels of the obtained denture image is smaller than or equal to GrayGap within the calculation time tNext from TC to the color state; otherwise, stopping irradiating ultraviolet light on the surface of the color-changing denture to obtain the color-matched denture when the color state conversion calculation time tNext is reached.
The beneficial effects are that: according to the scheme, the color state conversion calculation time can be accurately judged, the irradiation is stopped for a period of time, so that the irradiation time is slightly prolonged to improve the stability of the color state substance with the smallest adjacent tooth color difference, the actual use requirement can be met, and the photochromic material is more stable in the color state with the smallest adjacent tooth color difference.
Wherein, the ultraviolet light with the wavelength range of 150 nm-350 nm irradiates the surface of the color-changing denture: the surface of the color-changing denture is irradiated by any one of a high-pressure mercury lamp, a high-pressure metal halogen lamp, a plate burning lamp, a capillary ultra-high pressure mercury lamp, an optical cleaning lamp, a lamp special for optical discs, an ultraviolet iron lamp, a sterilizing lamp, a short-arc xenon lamp, and an excimer discharge lamp.
The embodiment of the application provides a color matching preparation system of a color-changing denture, as shown in fig. 2, which comprises: a processor, a memory, and a computer program stored in the memory and executable on the processor, the processor implementing the steps in an embodiment of a color matching preparation method of a color changing dental prosthesis when the computer program is executed, the processor executing the computer program to be run in a unit of the following system:
an image acquisition unit for acquiring a crown image;
and the color matching unit is used for matching colors of the color-changing false teeth according to the dental crown image.
The color matching preparation system of the color-changing denture comprises: the steps in the embodiment of the color matching preparation method of the color-changing denture are realized when the processor executes the computer program, and the color matching preparation system of the color-changing denture can be operated in a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud data center and the like, and the operable system can comprise, but is not limited to, a processor, a memory and a server cluster.
The color matching preparation system of the color-changing false tooth can be operated in computing equipment such as a desktop computer, a notebook computer, a palm computer, a cloud data center and the like. The color matching preparation system of the color-changing denture comprises, but is not limited to, a processor and a memory. It will be appreciated by those skilled in the art that the examples are merely examples of a color matching method for a color changing denture and are not limiting of a color matching method for a color changing denture, may include more or fewer parts than examples, or may combine certain parts, or different parts, e.g., the color matching system for a color changing denture may further include an input output device, a network access device, a bus, etc.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete component gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is a control center of the color preparation system of the one color changing denture, and which connects the individual sub-areas of the color preparation system of the entire one color changing denture using various interfaces and lines.
The memory may be used to store the computer program and/or the module, and the processor may implement various functions of the color matching preparation method of the color-changing denture by running or executing the computer program and/or the module stored in the memory and calling the data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Although the present application has been described in considerable detail and with particularity with respect to several described embodiments, it is not intended to be limited to any such detail or embodiment or any particular embodiment so as to effectively cover the intended scope of the application. Furthermore, the foregoing description of the application has been presented in its embodiments contemplated by the inventors for the purpose of providing a useful description, and for the purposes of providing a non-essential modification of the application that may not be presently contemplated, may represent an equivalent modification of the application.
Claims (7)
1. A method for color matching preparation of a color-changing denture, the method comprising the steps of:
s1, acquiring a dental crown image;
s2, preparing a color-changing denture;
and S3, color matching is carried out on the color-changed false teeth according to the dental crown image, and the color-matched false teeth are obtained.
2. The method according to claim 1, wherein in S1, the step of obtaining the dental crown image is to take a picture of the dental crown of the patient by a dental camera, an intra-oral camera, a CCD camera or a digital camera.
3. The method for preparing a color matching denture according to claim 1, wherein the method for preparing a color matching denture comprises: collecting three-dimensional data of a plaster cast or a dental impression of a patient's mouth by an extraoral scanner; or directly scanning three-dimensional data of the oral cavity of the patient by an intraoral scanner to obtain the three-dimensional data of the oral cavity of the patient; designing a denture mould according to the three-dimensional data of the oral cavity of a patient, transmitting the denture mould to a 3D printer, and printing to obtain a printed denture mould; grinding the printed denture mould through a grinder according to the three-dimensional data of the oral cavity of the patient to obtain a denture mould; the color-changing denture is prepared by injecting denture material into denture mold.
4. A method of color formulation for a color-changing dental prosthesis according to claim 3, wherein the dental prosthesis material comprises a dental filler and a photosensitive resin material; the weight percentage of the dental filler is 0-70wt%; the weight percentage of the photosensitive resin material is 30-100wt%; the dental filler comprises: any one or a combination of a plurality of zirconia, silica, titanium dioxide and polyethyl methacrylate; the particle size range of the dental filler is 3-25 mu m; the photosensitive resin material comprises acrylate resin or photo-curing resin, photo-curing agent, benzophenone, 2, 6-di-tert-butyl-p-cresol, ultraviolet absorbent and photochromic material; the photo-curing agent is any one of benzophenone, 2, 4-dihydroxybenzophenone and alpha-diketone; the photochromic material is diaryl ethylene compound.
5. The method for preparing color matching of color-changing dental prosthesis according to claim 1, wherein in S3, the method for color matching the color-changing dental prosthesis based on the crown image to obtain the color-matching dental prosthesis comprises:
irradiating the surface of the color-changing denture with ultraviolet light with the wavelength range of 150 nm-350 nm;
dividing the reference image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas by taking the dental crown image as a reference image, and marking gray level images of the image areas of 2 adjacent teeth in each image area of the reference image as 2 adjacent tooth images; the average value of Gray values of all pixel points in the 2 adjacent tooth images is Gray1 and Gray2 respectively, and the absolute value of the difference value between Gray1 and Gray2 is GrayGap;
acquiring an image of the color-changing denture as a target image in real time through a CCD camera, so that the time for starting ultraviolet irradiation on the surface of the color-changing denture is T0; the CCD camera obtains the interval duration of the target image as time1;
dividing a target image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas, marking gray level images of the image areas of the color-changing false teeth in each image area of the target image to serve as false tooth images, or recognizing the gray level images of the image areas of the color-changing false teeth in the target image by a YOLO target detection algorithm to serve as false tooth images;
acquiring denture images in real time from the time T0, and if the average Gray (TC) of Gray values of all pixels in the denture images at the current time TC is monitored to meet the condition: when the grade (TC) -Mean (Gray 1, gray 2) is less than or equal to GrayGap, stopping ultraviolet light to irradiate the surface of the color-changing denture, so as to obtain the color-matched denture; wherein Mean (Gray 1, gray 2) is the average of Gray1 and Gray 2.
6. The method for preparing color matching of color-changing dental prosthesis according to claim 1, wherein in S3, the method for color matching the color-changing dental prosthesis based on the crown image to obtain the color-matching dental prosthesis comprises:
irradiating the surface of the color-changing denture with ultraviolet light with the wavelength range of 150 nm-350 nm;
dividing the reference image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas by taking the dental crown image as a reference image, and marking gray level images of the image areas of 2 adjacent teeth in each image area of the reference image as 2 adjacent tooth images; the average value of Gray values of all pixel points in the 2 adjacent tooth images is Gray1 and Gray2 respectively, and the absolute value of the difference value between Gray1 and Gray2 is GrayGap;
acquiring an image of the color-changing denture as a target image in real time through a CCD camera, so that the time for starting ultraviolet irradiation on the surface of the color-changing denture is T0; the CCD camera obtains the interval duration of the target image as time1;
dividing a target image by a watershed algorithm or an edge detection operator to obtain a plurality of image areas, marking gray level images of the image areas of the color-changing false teeth in each image area of the target image to serve as false tooth images, or recognizing the gray level images of the image areas of the color-changing false teeth in the target image by a YOLO target detection algorithm to serve as false tooth images;
acquiring denture images in real time from the time T0, and if the average Gray (TC) of Gray values of all pixels in the denture images at the current time TC is monitored to meet the condition: when the grade (TC) -Mean (grade 1, grade 2) grade is less than or equal to grade gap, calculating the next color state conversion calculation time tNext at the current moment TC:
alternatively, tnext=ttcurrent+tmaxgray×pat;
PAT＝GaryG(TC-i×time1)/TGrayAVE；
taking all collected denture image formation sequences Map1 from the time T0 to the current time TC-time1, recording the average value of Gray values of all pixels of the denture images as MaAVE, and screening all denture image formation sequences Map2 with the absolute value of the difference value between each MaAVE and Gray (TC) in the sequences Map1 being smaller than or equal to GrayGap;
then tturrent is the acquisition instant of the denture image in a sequence Map2 closest to the current instant TC; or, tturrent is a collection time of a denture image nearest to the current time TC, which satisfies that an average value of all Gray values is less than or equal to |gray (TC) -Gray (TC-time 1) |;
TMaxGray is the maximum value of the interval duration between every two adjacent denture image acquisition moments in the sequence Map2;
TGrayAVE is an average value of interval duration between every two adjacent denture image acquisition moments in sequence Map2;
wherein i is a variable, N is the number of denture images in the sequence Map2, and PAT is a gradient color difference ratio;
GaryG (TC-i×time 1) is the i-th gradient color difference interval, and the calculation method of GaryG (TC-i×time 1) is as follows: taking the acquisition time of the false tooth image in a sequence Map2 which is closest to the time TC-i multiplied by 1 in the reverse time sequence direction and meets the condition that the average value of all Gray values is less than or equal to |Gray (TC) -Gray (TC-time 1) | as T1, and taking the GaryG (TC-i multiplied by 1) as the time from the time T1 to the time TC-i multiplied by 1;
wherein Gray (TC-time 1) is the average value of Gray values of all pixels in the denture image at the moment of TC-time 1;
wherein Mean (Gray 1, gray 2) is the average of Gray1 and Gray 2;
continuing to irradiate the surface of the color-changing denture with ultraviolet light from the current moment TC, and stopping irradiating the surface of the color-changing denture with ultraviolet light to obtain a color-matched denture if the average value of gray values of all pixels of the obtained denture image is smaller than or equal to GrayGap within the calculation time tNext from TC to the color state; otherwise, stopping irradiating ultraviolet light on the surface of the color-changing denture to obtain the color-matched denture when the color state conversion calculation time tNext is reached.
7. The method for preparing color matching of color changing denture according to claim 5, wherein the irradiation of ultraviolet light with wavelength ranging from 150nm to 350nm to the surface of the color changing denture is: the surface of the color-changing denture is irradiated by any one of a high-pressure mercury lamp, a high-pressure metal halogen lamp, a plate burning lamp, a capillary ultra-high pressure mercury lamp, an optical cleaning lamp, a lamp special for optical discs, an ultraviolet iron lamp, a sterilizing lamp, a short-arc xenon lamp, and an excimer discharge lamp.
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