A colorimetric method for zirconium oxide veneer

Abstract

The invention provides a colorimetric method for zirconia veneers. The colorimetric method uses a zirconia veneer color selection guide and a veneer colorimetric tool box according to expected effects, and can accurately determine the required veneer color through four-step comparisons. The colorimetric method can visually see the expected effect before the final product is prepared, unify the cognition of the clinical end and the technician end on the patient case, reduce the communication problems between doctors, patients and technicians, and reduce the difficulty of making veneers and the rework cost. The method is simple to operate, easy to implement, and is conducive to production application.

Description

Technical Field

[0001] The invention belongs to the technical field of dental restoration, and in particular relates to a colorimetric method for zirconium oxide veneers. Background Art

[0002] Tooth loss or defect is a common case in clinical oral treatment. In tooth restoration treatment, the restoration should not only have certain strength, wear resistance, corrosion resistance and biocompatibility, but also have good aesthetic properties. Especially in recent years, with the improvement of people's living standards, patients have higher and higher requirements for the closeness of the appearance of dental restorations to natural teeth. For example, the color of natural teeth has the characteristic of gradual change from the neck to the incisal tip of the tooth, and dental restorations are also required to have the same characteristics.

[0003] At present, the commonly used veneer restoration materials are mainly glass-ceramic materials. In clinical oral treatment, doctors use dental shade guides to compare the color of the patient's natural teeth, select the closest color number, and communicate with the technicians who make the restoration. The dental shade guide is composed of several shade guide tooth pieces. Each shade guide tooth piece assembly includes a shade guide tooth piece and a shade guide handle for installing the shade guide tooth piece. The shade guide tooth piece has several colors, and the front side is a full crown labial surface image of the central incisor, which is used to compare with the color of the patient's natural teeth. The consistency of the color of the shade guide tooth piece and the color of the restoration has become an important factor affecting the aesthetic effect of tooth restoration. In order to make a restoration with a realistic shape, color and luster that are consistent with the patient's natural teeth, it is very necessary to use a shade guide tooth piece that is consistent with the restoration in material, color, and light transmittance.

[0004] In the early days of zirconia all-ceramic restorations, the aesthetic properties of zirconia ceramics, such as transparency and glossiness, were not ideal, and its color was single, so zirconia was generally used as a base material. Multiple layers of veneer porcelain also need to be baked on the outside of the base to achieve the ideal aesthetic effect. At present, the VITA classical A1-D4 colorimetric plate (VITA classic 16-color colorimetric plate) and VITAToothguide 3D-MASTER colorimetric plate (VITA3D color colorimetric plate) commonly used in the market are both made of veneer porcelain, and are suitable for color comparison in the production of the above-mentioned "zirconia base-veneer porcelain" structure restorations.

[0005] In recent years, with the diversification of zirconia ceramics and the improvement of their light transmission properties, they can be directly used for veneer restorations without facing porcelain. However, since zirconia ceramic materials are completely different from the colorimetric tooth films in existing colorimetric plates, there are significant differences between the two in color and light transmission properties. It is difficult to use existing colorimetric plates such as VITAclassical A1-D4 colorimetric plates or VITAToothguide3D-MASTER colorimetric plates in clinical practice to achieve accurate colorimetric comparison of zirconia ceramic restorations.

[0006] In summary, providing a colorimetric method suitable for zirconia ceramics is of great significance to the development of dental restorations. Summary of the invention

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a colorimetric method for zirconia veneers to achieve accurate colorimetric measurement of zirconia ceramic restorations.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] The present invention provides a colorimetric method for zirconium oxide veneers, the colorimetric method comprising the following steps:

[0010] (1) Select the expected effect to assist in the selection of the color and thickness of the zirconia veneer;

[0011] (2) Use the veneer color comparison kit to compare with the teeth in the mouth to obtain the color of the abutment teeth;

[0012] (3) Determine the color selection area according to the abutment color and the zirconia veneer color selection guide;

[0013] The color selection guide is a standard card with the color of the abutment as the ordinate and the type of veneer material and the comprehensive data of the material base thickness as the abscissa;

[0014] (4) Based on the color selection area determined in step (3), use the zirconia veneer color guide to narrow the color selection range and determine the thickness size;

[0015] (5) Use the veneer colorimetric tool kit to determine the final zirconia veneer color;

[0016] (6) Process the zirconia veneer according to the final material data, color data and thickness size data.

[0017] At present, the existing colorimetric method of glass ceramic veneer is relatively rough, and the veneer scheme is determined only by the colorimetric comparison of the abutment teeth, resulting in a large error between the finished product and the expected effect, increasing the communication between doctors, patients and technicians, and the rework cost, and the colorimetric plate of glass ceramic veneer is not applicable to zirconia ceramic veneer. Therefore, the present invention designs a set of colorimetric methods suitable for zirconia veneer, which can intuitively see the expected effect before the final product is prepared, unify the clinical end and the technician end's cognition of the patient's case, reduce the communication problems between doctors, patients and technicians, and reduce the difficulty of making veneers and the rework cost. The colorimetric method of the present invention is simple to operate, easy to implement, and is conducive to production and application.

[0018] The following are preferred technical solutions of the present invention, but are not intended to be limitations of the technical solutions provided by the present invention. Through the following technical solutions, the technical objectives and beneficial effects of the present invention can be better achieved and realized.

[0019] As a preferred technical solution of the present invention, the veneer colorimetric tool kit in step (2) includes an abutment colorimetric plate and a zirconia veneer.

[0020] Preferably, in step (2), the abutment tooth color guide is used to compare with the teeth in the oral cavity to obtain the abutment tooth color.

[0021] Preferably, the abutment color guide includes 12 colors, namely A1, A2, A3, A3.5, A4, B2, B4, C2, D2, ND3, ND8 and ND9.

[0022] In the present invention, the abutment color plates are all made of resin materials, and the 12 abutment colors are all industry standard colors, which will not be described here.

[0023] As a preferred technical solution of the present invention, the ordinate of the zirconia veneer color selection guide in step (3) includes 7 categories of abutment tooth colors, namely Bleach, A1, A2, A3, A3.5, A4 and Brown dark, among which A2, B2, C2 and D2 are all classified as A2 category, A3 and ND3 are all classified as A3 category, A4 and B4 are all classified as A4 category, and ND8 and ND9 are all classified as Brown dark category.

[0024] Preferably, the horizontal axis of the zirconia veneer color selection guide in step (3) includes 8 categories, namely extreme white (EW), bright white (BW), high brightness (HV), low brightness (LV), bright white gradient (BWM), high brightness gradient (HVM), low brightness gradient (LVM) and Hollywood white (HW).

[0025] As a preferred technical solution of the present invention, in the zirconia veneer color selection guide in step (3), each category in the horizontal axis includes two material base thicknesses, which are 0.4 mm and 0.6 mm respectively.

[0026] In the zirconia veneer color selection guide of the present invention, when the type of veneer material and the basic thickness of the material are determined, its color is actually determined accordingly. Therefore, in the grid formed by the horizontal and vertical coordinates of the color selection guide, the effect displayed by each grid is based on the color of the abutment teeth, and the surface is affixed with the corresponding zirconia veneer. The patient can select the desired effect in the color selection guide based on the color of his or her own abutment teeth and according to his or her own needs (such as bright white, natural, dark, etc.), and then proceed to the next step of comparison.

[0027] As a preferred technical solution of the present invention, the zirconia veneer color selection guide in step (3) includes three brightness zones, namely a bright white zone, a natural zone, and a color-blocking zone.

[0028] As a preferred technical solution of the present invention, in the zirconia veneer color selection guide in step (3), the bright white area is an area determined by the abutment color Bleach to A3, and the horizontal axis category is extreme white to high brightness;

[0029] Preferably, in the zirconia veneer color selection guide in step (3), the natural area is determined by the abutment color Bleach to A3, and the horizontal axis category is low brightness to Hollywood white;

[0030] Preferably, in the zirconia veneer color selection guide in step (3), the color-blocking area is an area determined by the abutment color A3.5 to Brown dark and the horizontal axis category extreme white to Hollywood white.

[0031] The division of these three areas can help doctors and patients quickly narrow down the selection range and save time.

[0032] As a preferred technical solution of the present invention, the zirconia veneer colorimetric plate in step (4) includes at least 8 categories, namely extreme white (EW), bright white (BW), high brightness (HV), low brightness (LV), bright white gradient (BWM), high brightness gradient (HVM), low brightness gradient (LVM) and Hollywood white (HW).

[0033] In the present invention, the zirconium oxide veneer colorimetric plate includes not only the above-mentioned 8 commonly used categories, but also 2 categories A1 and B1.

[0034] As a preferred technical solution of the present invention, the zirconia veneer colorimetric plate in step (4) includes a curved plate and a base for supporting the curved plate.

[0035] As a preferred technical solution of the present invention, the arc plate gradually becomes thicker from top to bottom, and the thinnest part of the upper end does not exceed 0.4mm, for example, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm or 0.4mm, etc.; the thickest part of the lower end is not less than 0.7mm, for example, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm or 1.2mm, etc. The selection of the above numerical values ​​is not limited to the listed numerical values, and other unlisted numerical values ​​within their respective numerical ranges are equally applicable.

[0036] In the present invention, the arc-shaped colorimetric plate fits the natural teeth better, which can make the colorimetric effect more accurate, and the overall thickness variation includes 0.4mm and 0.6mm. There is no need to prepare two additional colorimetric plates of different thickness specifications. One plate can enable the patient to confirm the thickness size.

[0037] In addition, since the bottom of the curved plate needs to be connected and fixed to the base, part of the length of the lower end will be covered by the base, but it is sufficient as long as the exposed part that can be used for color comparison covers 0.4mm-0.6mm.

[0038] As a preferred technical solution of the present invention, the more specific operation of step (5) includes: according to the color selection range and thickness size narrowed down in step (4), the corresponding zirconia veneer is pasted on the selected abutment color plate, and the final zirconia veneer color is determined by displaying the overall effect.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The colorimetric method for zirconium oxide veneers of the present invention can visually see the expected effect before the final product is prepared, unify the understanding of the patient's case by the clinical end and the technician end, reduce the communication problems between doctors, patients and technicians, and reduce the difficulty of veneer production and rework costs. The colorimetric method of the present invention is simple to operate, easy to implement, and is conducive to production application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a photograph of the patient's teeth in the oral cavity before restoration provided in Example 1 of the present invention.

[0042] Figure 2 It is a schematic structural diagram of the abutment colorimetric plate provided in Example 1 of the present invention.

[0043] Figure 3 This is the color selection guide picture provided by Example 1 of the present invention.

[0044] Figure 4 It is a schematic diagram of the structure of the zirconia veneer colorimetric plate provided in Example 1 of the present invention.

[0045] Figure 5 This is a photo of the teeth in the patient's mouth after restoration provided in Example 1 of the present invention.

[0046] Among them, 1-abutment part, 2-support part, 3-arc plate, 4-base. DETAILED DESCRIPTION

[0047] In order to better illustrate the present invention and facilitate understanding of the technical solution of the present invention, the present invention is further described in detail below. However, the following embodiments are only simple examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0048] The following are typical but non-limiting embodiments of the present invention:

[0049] Embodiment 1:

[0050] This embodiment provides a colorimetric method for zirconium oxide veneers, and the colorimetric method comprises the following steps:

[0051] (1) Patient’s request: To improve the yellowish color of existing teeth, zirconia veneers are used for restoration. The patient expects the restoration to be bright and white. The patient’s oral teeth before restoration are shown in the following figure: Figure 1 As shown;

[0052] (2) Based on the patient's expectations, the doctor uses the abutment tooth color comparison plate in the veneer color comparison tool box to compare with the patient's natural teeth and obtains the patient's abutment tooth color as A1; the schematic diagram of the abutment tooth color comparison plate is as follows Figure 2 As shown, the abutment colorimetric template includes an abutment part 1 and a supporting part 2;

[0053] (3) According to the patient's abutment color A1 and the expected effect (bright, white), the doctor uses the zirconia clinical color selection guide to lock the color selection area, that is, the material and thickness range to be selected, including: zirconia veneer restorations with a thickness of 0.4 mm and 0.6 mm made of extreme white (EW), bright white (BW) and high brightness (HV); the color selection guide is as follows Figure 3 As shown;

[0054] (4) According to the color selection area determined in step (3), the zirconia veneer color plates of extreme white (EW), bright white (BW) and high brightness (HV) are taken and compared with the patient respectively to show the achievable effect. According to the patient's choice, the range is narrowed down to zirconia veneer restorations with a thickness of 0.4 mm made of bright white (BW) and high brightness (HV); wherein, the structural schematic diagram of the zirconia veneer color plate is as follows Figure 4 As shown, the zirconia veneer colorimetric comprises an arc-shaped plate 3 and a base 4 for supporting the arc-shaped plate 3, wherein the thinnest part of the upper end of the arc-shaped plate 3 is 0.4 mm, and the thickest part of the lower end is 1.2 mm;

[0055] (5) Using the abutment tooth shade guide and zirconia veneer in the veneer colorimetric tool box, the selected zirconia veneer restorations made of bright white (BW) and high brightness (HV) with a thickness of 0.4 mm were pasted on the A1 abutment tooth shade guide. After comparing the effects, the patient finally chose the zirconia veneer restoration made of bright white (BW) with a thickness of 0.4 mm;

[0056] (6) The finalized material data, color data, and thickness size data are transmitted to the denture processing factory for subsequent zirconia veneer processing.

[0057] After restoration, the patient's teeth are shown in the following figure: Figure 5 shown.

[0058] Embodiment 2:

[0059] This embodiment provides a colorimetric method for zirconium oxide veneers, and the colorimetric method comprises the following steps:

[0060] (1) Patient’s demand: To improve the existing dark tooth color, zirconium oxide veneer restoration is used. The patient expects that the restoration will improve the existing dark color and present a natural color effect;

[0061] (2) Based on the patient's expectations, the doctor uses the abutment tooth color plate in the veneer color comparison tool box to compare with the patient's natural teeth and obtains the patient's abutment tooth color as A3;

[0062] (3) According to the patient's abutment color A3 and the expected effect (natural), the doctor uses the zirconia clinical color selection guide to lock the color selection area, that is, the material and thickness range that can be selected, including: low lightness (LV), bright white gradient (BWM), high lightness gradient (HVM) and low lightness gradient (LVM) made of zirconia veneer restorations with a thickness of 0.4 mm and 0.6 mm;

[0063] (4) According to the color selection area determined in step (3), take low lightness (LV), bright white gradient (BWM), high lightness gradient (HVM) and low lightness gradient (LVM) zirconia veneer color plates and show them to the patient for comparison, to demonstrate the achievable effect, and narrow the range to high lightness gradient (HVM) and low lightness gradient (LVM) zirconia veneer restorations with a thickness of 0.6 mm according to the patient's choice;

[0064] (5) Using the abutment tooth shade plate and zirconia veneer in the veneer colorimetric tool box, the selected high-value gradient (HVM) and low-value gradient (LVM) zirconia veneer restorations with a thickness of 0.6 mm were pasted on the A3 abutment tooth shade plate. After comparing the effects, the patient finally chose the zirconia veneer restoration with a thickness of 0.6 mm made of low-value gradient (LVM);

[0065] (6) The finalized material data, color data, and thickness size data are transmitted to the denture processing factory for subsequent zirconia veneer processing.

[0066] From the above examples, it can be seen that the colorimetric method for zirconium oxide veneers of the present invention can visually see the expected effect before the final product is prepared, unify the clinical and technicians' understanding of the patient's case, reduce the communication problems between doctors, patients and technicians, and reduce the difficulty of veneer production and rework costs. The colorimetric method of the present invention is simple to operate, easy to implement, and conducive to production and application.

[0067] The present invention illustrates the detailed method of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed method, that is, it does not mean that the present invention must rely on the above-mentioned detailed method to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the operation of the present invention, addition of auxiliary operations, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A colorimetric method for zirconium oxide veneers, characterized in that: The colorimetric method comprises the following steps: (1) Select the expected effect to assist in the selection of the color and thickness of the zirconia veneer; (2) Use the veneer color comparison kit to compare with the teeth in the mouth to obtain the color of the abutment teeth; (3) Determine the color selection area according to the abutment color and the zirconia veneer color selection guide; The color selection guide is a standard card with the color of the abutment as the ordinate and the type of veneer material and the comprehensive data of the base thickness of the material as the abscissa; In the grid formed by the horizontal and vertical coordinates of the color selection guide, each grid shows the final effect of the abutment tooth color as the base and the corresponding zirconium oxide veneer on the surface; (4) Based on the color selection area determined in step (3), use the zirconium oxide veneer color guide to narrow the color selection range and determine the thickness size; (5) Use the veneer colorimetric tool kit to determine the final zirconia veneer color; (6) Process the zirconia veneer according to the final material data, color data and thickness size data; Step (4) The zirconia veneer colorimetric plate comprises a curved plate and a base for supporting the curved plate; The arc-shaped plate gradually becomes thicker from top to bottom, and the thinnest part at the top is no more than 0.4 mm, and the thickest part at the bottom is no less than 0.7 mm; The veneer color comparison tool box comprises an abutment color comparison plate and a zirconium oxide veneer; Use the abutment tooth color comparison plate to compare with the teeth in the oral cavity to obtain the abutment tooth color; The abutment color chart includes 12 colors, namely A1, A2, A3, A3.5, A4, B2, B4, C2, D2, ND3, ND8 and ND9; The ordinate of the zirconia veneer color selection guide includes 7 categories of abutment color, which are Bleach, A1, A2, A3, A3.5, A4 and Brown dark, wherein A2, B2, C2 and D2 in the abutment color chart are all classified as A2 category, A3 and ND3 in the abutment color chart are all classified as A3 category, A4 and B4 in the abutment color chart are all classified as A4 category, and ND8 and ND9 in the abutment color chart are all classified as Brown dark category; The horizontal axis of the zirconia veneer color selection guide includes 8 categories, namely, extreme white, bright white, high brightness, low brightness, bright white gradient, high brightness gradient, low brightness gradient and Hollywood white; In the zirconia veneer color selection guide, each category in the horizontal axis includes two material base thicknesses, 0.4 mm and 0.6 mm; The zirconia veneer color selection guide includes three brightness zones, namely, a bright white zone, a natural zone, and a color-blocking zone.

2. The colorimetric method according to claim 1, characterized in that In the zirconia veneer color selection guide of step (3), the bright white area is determined by the abutment color Bleach, A1, A2 and A3, and the horizontal axis category is extremely white to high brightness.

3. The colorimetric method according to claim 1, characterized in that: In the zirconia veneer color selection guide of step (3), the natural area is determined by the abutment color Bleach, A1, A2 and A3, and the horizontal axis category is low brightness to Hollywood white.

4. The colorimetric method according to claim 1, characterized in that: In the zirconia veneer color selection guide of step (3), the color-blocking area is determined by the abutment color A3.5, A4 and Brown dark, and the horizontal axis category is extreme white to Hollywood white.

5. The colorimetric method according to claim 1, characterized in that: The more specific operation of step (5) includes: according to the color selection range and thickness size narrowed down in step (4), the corresponding zirconia veneer is pasted on the selected abutment color plate, and the final zirconia veneer color is determined by displaying the overall effect.

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