JP2015020001A - Dental shade guide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dental shade guide for being used in application of a dental prosthesis made of zirconia.SOLUTION: A dental shade guide comprises a dental sample part that is formed of stabilized or partially stabilized zirconia and that includes a region imitating an occlusal surface of a molar region, and a rod-like handle to which the dental sample part is attached.

Description

  The present invention relates to a dental shade guide which is a color sample used for determining the color tone of a dental prosthesis to be applied.

Dental resin, dental porcelain, etc. used when producing dental prostheses such as inlays and crowns may be described as tooth materials for dental prostheses with excellent aesthetics (hereinafter simply referred to as “dental materials”). .) On the other hand, the color of the tooth varies from person to person, and if there is a large color difference between the tooth to be prosthetic or its neighboring teeth and the tooth prosthesis to be produced, the tooth prosthesis is unnatural in the oral cavity. It will stand out. Therefore, for example, when the dental prosthesis to be manufactured is an inlay, it is necessary to have the same color tone as that of the tooth in which the cavity is present, and when the dental prosthesis to be manufactured is a crown or a bridge, the adjacent tooth is used. It is necessary to have a similar color tone. Hereinafter, the tooth to be compared that should have the same color tone may be referred to as “neighboring tooth etc.”.
In order to prevent such an unnatural color tone, although it differs depending on the type of tooth material, usually, the same type of dental prosthesis is prepared in advance from several colors to several tens of colors. .

  Specifically, the dentist decides the color tone of the dental prosthesis to be prepared using the dental shade guide when requesting the dental technician to make the dental prosthesis to the dental technician who is an expert in producing the dental prosthesis. Instruct. The dental shade guide is a color sample of a dental prosthesis having a certain color tone, and a plurality of dental shade guides having different color tones are prepared. Thereby, the difference in the color tone of a several dental prosthesis can be confirmed easily visually. The dentist selects a dental shade guide having the most harmonious color with respect to the color tone of the patient's adjacent teeth, etc., from among these many different shade shade dental guides. For example, the dental shade guide to be used is selected. Tell the dental technician with a number.

  Such a dental shade guide has a form in which one sample of a dental prosthesis is attached to the surface of one end of a handle portion which is a belt-like plate, as described in Patent Document 1, for example. Conventional dental shade guides are made of a porcelain material or a resin material which is the same material as that constituting the dental prosthesis. And as the structure was disclosed by patent document 2, 3, for example, what has a dentin layer, an enamel layer, etc. like a natural tooth was common.

  The color of the dental shade guide is classified according to the three coordinate values of lightness, saturation (saturation), and hue of natural teeth, and A1, A2, A3,... The name is given. A plurality of dental shade guides having different names are arranged to constitute a dental color sample (shade guide system).

  On the other hand, zirconia has attracted attention as a tooth material having excellent characteristics that can be used in tooth prostheses. However, zirconia has a problem in aesthetics and so far has been used only for abutment teeth. On the other hand, in recent years, the aesthetics of this zirconia has improved, and for example, as described in Patent Documents 4 and 5, it has become possible to obtain a color tone similar to a tooth. For this reason, zirconia dental prostheses are beginning to be used.

Utility Model Registration No. 2565706 JP-A-5-332839 Japanese Patent No. 5108885 JP 2002-536280 A Special table 2010-534245 gazette

  However, zirconia has a different coloring process from porcelain and resin, and also has a different transparency from porcelain and resin. Therefore, even if the conventional dental shade guide as described above is used, it has been difficult to accurately confirm or match the color tone of the zirconia dental prosthesis. That is, even if the color (for example, A2) of a conventional dental shade guide is selected and zirconia is colored, it is not always the intended color tone but often appears as a different color to the human eye. In particular, the occlusal surface of the molar tooth is present in the back of the oral cavity, and the color sense peculiar to zirconia having a unique transparency is required from the three-dimensional condition due to the unevenness.

  Then, this invention makes it a subject to provide the dental shade guide used when applying the dental prosthesis which made the material zirconia.

  The present invention will be described below. Here, for ease of understanding, reference numerals attached to the drawings are described in parentheses, but the present invention is not limited thereto.

  The invention according to claim 1 is a rod-shaped sample part formed from stabilized or partially stabilized zirconia and including a tooth sample part (11) including a part (11a) imitating the occlusal surface of a molar, and a rod-like sample part to which the tooth sample part is attached. A dental shade guide (10) comprising a handle (12).

  The invention according to claim 2 is the dental shade guide (10) according to claim 1, wherein the tooth sample portion (11) has a portion (11a) imitating the entire occlusal surface and is separated from the occlusal surface. It has a thickness of 1 mm or more and 5 mm or less.

  According to a third aspect of the present invention, in the dental shade guide (10) according to the first or second aspect of the present invention, the dental shade guide (10) has a display portion on which the color tone of the tooth sample portion (11) is written, and the display portion includes a tooth The kind of coloring liquid used for coloring the sample portion or a symbol indicating it is written.

  The invention according to claim 4 is the dental shade guide (10) according to any one of claims 1 to 3, wherein the tooth sample portion (11) has Pr, Er, Fe, Co, Ni, Or Cu is contained.

  According to the present invention, when applying a zirconia dental prosthesis to a patient, the color tone can be intended.

1 is a front view of a dental shade guide 10. FIG. 1 is a perspective view of a dental shade guide 10. FIG. 1 is a front view of a shade guide system 1. FIG.

  The above-described operation and gain of the present invention will be clarified from the following embodiments of the invention. Hereinafter, the present invention will be described based on embodiments shown in the drawings. However, the present invention is not limited to these forms.

  FIG. 1 is a front view of a dental shade guide 10 according to one embodiment, and FIG. 2 is a perspective view of the dental shade guide 10. The dental shade guide 10 has a tooth sample portion 11 and a handle 12.

The tooth sample portion 11 is a portion that functions as a color sample of a molar prosthesis, and in this embodiment, includes a portion 11a that imitates the occlusal surface of the molar tooth, which simulates the shape of a tooth that also represents a fissure. ing. The part 11a imitating the occlusal surface of the molar tooth has a three-dimensional shape due to the unevenness, and this three-dimensional shape affects the color sense peculiar to zirconia having a unique transparency. Therefore, in order to confirm the influence, it is necessary that the tooth sample portion 11 is reproduced with a form simulating the unevenness.
Further, the part 11a simulating the occlusal surface of the molar tooth is preferably simulated so as to include the entire occlusal surface as shown in FIGS. 1 to 3, and in a direction away from the part 11a as shown by A in FIG. It is preferable to have a thickness of 1 mm or more and 5 mm or less and imitate only the occlusal surface of the tooth. In other words, the tooth sample portion 11 has a portion 11a imitating the occlusal surface of a molar tooth, and the thickness direction (the back / front direction of FIG. 1 and the vertical direction of FIG. 2) is thin. . At this time, it is preferable that the surface opposite to the portion 11a simulating the occlusal surface is a flat surface because the three-dimensional condition due to the unevenness of the portion 11a is easily stabilized and the handle 12 described later is easily attached.
The occlusal surface of the molar tooth of the dental prosthesis is arranged in the back of the oral cavity, and from the viewpoint of three-dimensional condition due to the unevenness, a zirconia-specific color sensation with a unique transparency is required. By setting it as the said shape, it can be set as a suitable shade guide. Moreover, if the part 11a imitating the occlusal surface is included and the other part is thin, the dental shade guide 10 can be easily stored and the storage space can be reduced.

  The tooth sample part 11 is formed of stabilized or partially stabilized zirconia. As the stabilized or partially stabilized zirconia, zirconia conventionally used in dentistry can be used. This includes, for example, partially stabilized zirconia in which a rare earth oxide such as yttrium oxide or cerium oxide is dissolved as a stabilizer, and oxygen vacancies are formed in the crystal structure, thereby preventing destruction due to temperature rise and fall. (Partially stabilized zirconia). Yttria-based partially stabilized zirconia in which yttrium oxide is dissolved as a stabilizer is white in color and is suitable for a dental prosthesis. Similarly, ceria-based partially stabilized zirconia in which cerium oxide is dissolved as a stabilizer has high strength and toughness that hardly deteriorate at low temperatures.

In this embodiment, the tooth sample 11 can be obtained by coloring zirconia as follows.
First, pressure is applied to the raw material that is a powder, and then the powder is semi-sintered. In the semi-sintering, for example, it is processed at a temperature of 900 ° C. or higher and lower than 1450 ° C. to form a semi-sintered zirconium oxide.
Next, after the obtained semi-sintered zirconium oxide is cut into the shape of the tooth sample portion, it is immersed in a metal ion solution or a metal complex solution and further sintered.

  Here, coloring is performed by immersing semi-sintered zirconium oxide in a metal ion solution or a metal complex solution. More specifically, for example, Pr (praseodymium), Er (erbium), Fe (iron), Co (Cobalt), Ni (nickel) and Cu (copper) may be immersed in a metal complex solution containing one or more. At this time, the solution is an aqueous solution and may contain alcohol. The concentration of the solution is preferably 0.001% by mass or more and 12% by mass or less.

  The color tone of the tooth sample is adjusted by the composition and concentration of the solution used for immersion. For example, iron ions (Fe) and praseodymium ions (Pr) can express yellow, and erbium (Er) can express red. Therefore, for example, when it is desired to express the color tone of “A1” in a conventional dental shade guide with a completed dental prosthesis made of zirconia, it is added to a polyethylene glycol solution containing 1% by mass of iron chloride and 4% by mass of erbium chloride. Soak at 2 ° C. for 2 minutes. Similarly, for example, when it is desired to express the color tone of “A3” of a conventional dental shade guide with a completed dental restoration made of zirconia, a polyethylene glycol solution containing 2% by mass of iron chloride and 6% by mass of erbium chloride is used. Soak for 2 minutes at 24 ° C. In this way, coloring is performed by combining the respective color components.

  Since zirconia dental prosthesis has a different transparency from conventional porcelain and resin, as described above, it often does not correspond to the color (A1, A3, etc.) of conventional dental shade guides. It is difficult to accurately confirm or match the color tone of the zirconia dental prosthesis.

  In dental laboratories, the production of dental prostheses for coloring an uncolored zirconia block is also widely performed. In this case, it is preferable to describe the name of the solution used for coloring (for example, F1E3 etc.) in the dental shade guide because the colors can be easily matched at the site of coloring such as a dental laboratory. Therefore, the dental shade guide 10 has a display portion on which the color tone of the tooth sample portion 11 is written, and is written with the type of coloring liquid used for coloring the tooth sample portion 11 or a symbol indicating it. preferable. The part where the display unit is disposed is not particularly limited, but the handle 12 described later is preferable, but the tooth sample unit 11 may be used.

Moreover, the tooth sample part 11 can also be produced as follows.
As a zirconia-based composite ceramic, a material containing 8 mol% or more and 12 mol% or less of ceria and containing zirconia particles composed of tetragonal zirconia and alumina particles is used as a raw material. These raw material blends are compacted with CIP or the like and then semi-sintered. The treatment temperature during the semi-sintering is preferably 900 ° C. or higher and lower than 1450 ° C. By setting the temperature in the process of semi-sintering to a range of 900 ° C. or higher and lower than 1450 ° C., it is possible to prevent a decrease in strength of the manufactured dental prosthesis and to shorten the time required for cutting.
Next, the semi-sintered zirconia composite ceramics is cut into the shape of the tooth sample portion, dipped in a neodymium ion solution or complex solution for 1 minute or more, dried, and then fired. The coloring of the dental sample part 11 is adjusted by the composition and concentration of the solution used for immersion as described above.

  In addition to the above methods, there is a method in which a metal oxide colorant such as chromium oxide, nickel oxide, cobalt oxide, vanadium oxide is added according to a desired color tone, mixed, and then sintered. However, with this method, the thermal expansion coefficient and elastic constant of the metal oxide used as the colorant are different from those of zirconia, leading to a decrease in strength, and uneven dispersion tends to cause uneven color. .

  The handle 12 is a handle portion for holding by hand when the dental shade guide 10 is used, and has a rod shape. In this embodiment, it is a transparent plate shape that is long in one direction. The form of the handle 12 is not particularly limited, and a form similar to a known dental shade guide can be applied. For example, as will be described later, when configuring a shade guide system 1 (see FIG. 3) including a plurality of dental shade guides 10 having different color tones, the dental shade guide 10 is held in the holder 2 (see FIG. 3). It is good also as a handle | steering-wheel which has a structure for (for example, the clip function hold | maintained on both sides of a holder).

  The above-described tooth sample portion 11 is attached to one end in the longitudinal direction of the handle 12 to form a dental shade guide 10. At this time, it is preferable that the tooth sample part 11 and the handle | steering-wheel 12 are connected so that rotation centering on the axis | shaft 10a is possible. Thereby, when using the dental shade guide 10, the direction of the tooth sample part 11 can be changed.

  According to the dental shade guide 10 as described above, the color tone can be appropriately selected when a dental prosthesis using zirconia is applied. Then, if the selected dental shade guide is transmitted to the dental technician, it is possible to obtain a dental prosthesis having the same color by coloring in the same manner as this, and it is possible to apply the dental prosthesis having the intended color. is there.

  FIG. 3 shows a front view of a shade guide system 1 including a plurality of dental shade guides 10 having different color tones. The shade guide system 10 includes four dental shade guides 10 and includes tooth sample portions 11 each having a different color tone. A handle 12 of each dental shade guide 10 is held by the holder 2. However, the handle 12 and the holder 2 can be attached and detached, whereby the dental shade guide 10 can be detached from the holder 2 as necessary. The removed dental shade guide 10 is inserted, for example, by a dentist into the oral cavity of a patient, and contrasts with the adjacent teeth and the like.

DESCRIPTION OF SYMBOLS 1 Shade guide system 2 Holder 10 Dental shade guide 11 Tooth sample part 12 Handle

Claims (4)

A tooth sample formed from a stabilized or partially stabilized zirconia and including a portion simulating the occlusal surface of a molar;
A dental shade guide comprising: a rod-like handle to which the tooth sample portion is attached.   2. The dental shade guide according to claim 1, wherein the tooth sample portion has a portion imitating the entire occlusal surface and has a thickness of 1 mm or more and 5 mm or less in a direction away from the occlusal surface.   3. The display unit according to claim 1 or 2, wherein a color portion of the tooth sample portion is displayed, and the display portion includes a color liquid used for coloring the tooth sample portion or a symbol indicating the color liquid. Dental shade guide as described.   The dental shade guide according to any one of claims 1 to 3, wherein the tooth sample portion contains Pr, Er, Fe, Co, Ni, or Cu.

Images