Zirconia dyeing technology for dentures


Abstract: With the continuous development of scientific economy, people’s quality of life continues to improve. Excessive intake of foods high in sugar can lead to premature tooth damage. Therefore, dentistry continues to evolve in the field of dentures. This article involves the dyeing of zirconia used for dentures, and discloses the zirconia immersion dyeing process, which includes the process of pre-sintering zirconia. After crushing the prematurely sintered zirconia, add a ball mill to grind it. Infiltrate zirconium oxide into the dye solution. Dry with ultraviolet sterilizing lamp. Sintered at sustained high temperatures. The zirconium oxide dyeing process supported by this technology has a short marketing and promotion time, can obtain zirconium oxide that is close to the color of natural teeth, improves productivity, is suitable for industrial production, and provides a theoretical analysis for the application of engineering projects.

Keywords: denture; zirconia; dyeing treatment

With the differences in our living standards, the use of oral materials is becoming more and more common. At present, as a new material, zirconia has excellent properties, such as strength, strength, ductility, wear resistance, etc. It has good compatibility and is widely used as a dental restoration material. It has more general application prospects in the oral materials industry.

Zirconia porcelain is milky white. Of course, there are certain differences in the color and permeability of teeth, so it cannot meet the patient's requirements for beauty [1]. In order to ensure the simulation of the color of the denture, the traditional method is to use ceramic powder veneer on the surface of the zirconia inner crown, but this requires increasing the amount of preparation of the abutment teeth. Therefore, the pre-sintered full zirconia dyed oxygen technology can meet the patient's requirements by adjusting the color and light transmittance of the zirconia itself to restore the color and light transmittance of the tooth to be restored as much as possible.

At present, the coloring technology of zirconia pre-oxidized crowns mainly includes powder dyeing and liquid dip-dying methods. The veneer method is to pile up porcelain powder and evenly sinter it on the zirconia surface. The external dyeing method is to pre-sinter through soaking or coating. The dyeing liquid containing coloring matter is infiltrated into the cloth [2].

1. Analysis of current status of zirconia dyeing technology

(1) The process is complicated and takes a long time

Chinese patent application 201510893471.4 involves soaking pre-sintered zirconia dentures in the dyeing solution. The dyeing time is 10 seconds. After the dyeing is completed, more liquid is absorbed. The drying time is 10-20 minutes. The fuel, zirconia, and dentures are announced. Gradient dyeing process. Dip the dye solution on the brush and apply it to a part of the dry zirconia denture. Produce multi-faceted color conversion effects. The colored zirconia dentures are dried, and the drying time is 10-20 minutes; the crystals are then sintered, the sintering environment temperature is 1480-1530, and the sintering time is 12 hours. Hardened oxidized dentures with different gradients can be obtained. The gradient process of zirconia dentures provided by this process can achieve the actual effect of enamel, but after soaking and dyeing, a brush is dipped in the dye solution, and then the dried zirconia dentures are used. The process is complicated, the processing time is long, and the cost is high. low efficiency.

(3) Decreased dyeing durability

Chinese patent application 20151054544.0 announced the personalized colored zirconia Chico stent and its production and manufacturing methods. (1) Use yttrium oxide as a thickening agent in the form of zirconium oxide powder to look like a stent. (2) Early sintering and forming of the stent blank. (3) Use dyeing solution to dye the previously sintered zirconia scaffold. (4) Dry and dye the zirconia scaffold blank. (5) Sinter the dried zirconia stent blank to obtain a personalized colored zirconia dental stent. The processing technology is very simple. The formed inner crown is soaked and dyed, which improves the ability of the stent to be dyed and the lack of surface dyeing to combine, resulting in a decrease in the color hiding effect.

2. Improved zirconia dyeing technology

This technology solves the shortcomings of the current process by providing a zirconium oxide infiltration coloring and dyeing process, which makes the dyeing even and highly efficient.

This technical requirement is the zirconia infiltration coloring and dyeing process, which includes the following processes:

In the first stage, the pre-sintered zirconia is ground.

In the second stage, after cleaning the pre-sintered zirconia, the tooth surface morphology is finely processed.

In the third stage, the zirconia obtained in process 2 is soaked in the dye liquor.

In the fourth stage, the zirconia obtained in drying process 3 is irradiated with a visible light lamp.

In the fifth stage, the zirconia obtained in process 4 is sintered at 1550-1580°C, and the sintering time is 30-45 minutes.

The pre-sintering environment temperature is 1250 ~ 1300, and the duration is 15 ~ 30 minutes. The above penetration time is 5-10 minutes, which increases the contact area between zirconium oxide and dye solution. Zirconium oxide is easy to dye. Zirconium oxide is a spherical particle and the dyeing is more uniform. The dyeing solution contains at least one dyeing ion among erbium ions, cerium ions, neodymium ions, cobalt ions and iron ions, selected as erbium ions, praseodymium ions and cobalt ions. The content of dyeing ions in the dyeing solution is 0.05-0.20mol/L. The above dyeing solution contains 0.5-0.8wt% polyethylene glycol and 0.2-0.5wt% sodium oxide, which is penetrated into 0.6wt% polyethylene glycol and 0.3wt% sodium oxide. The corresponding immersion environment temperature for zirconium oxide in the dye solution is 35-50°C, and the immersion time is 30-45s. The duration of light preheating and drying of the dyeing solution soaked in zirconia is 15-20 seconds. The dyeing solution can be reasonably penetrated into the internal structure of zirconia to make the dyeing more uniform and lasting. The corresponding wavelength of ultraviolet light is 320-400nm, and the selection is 350-400nm. In process 5, the sintered zirconia is cooled to 1000 at 8-10/MIN and then cooled naturally.

The zirconium oxide dyeing process provided by this technology adopts a two-step sintering process. The dyeing liquid completely penetrates into the zirconium oxide, which is uniform and long-lasting. After soaking the zirconia, use ultrasonic equipment to vibrate, which can effectively penetrate the dyeing solution into the internal structure of the zirconia, making the dyeing more uniform. In addition, by adding polyethylene glycol and sodium oxide to the dyeing solution used in this method, together with the soaking method and duration in the dyeing solution, uniform and stable zirconia can be obtained. The zirconium oxide dyeing process of the present invention has a short dyeing time, can obtain zirconium oxide that is close to the color of natural teeth, improves productivity, and is suitable for the current industrial production model.


The article explains in detail the zirconium dioxide infiltration coloring and dyeing processing technology specified in this technical implementation regulation. This article uses actual cases to explain in detail the principles and implementation methods of this technology. The description of the above embodiments is only helpful for understanding the method and core content of the present invention. At the same time, for general technical personnel in this industry, based on the concept of this technology, the actual implementation methods and application areas are likely to change.


[1] Gao Yong, Liu Ce, Wang Yunqiang, et al. Preparation method of zirconia dental materials:, CN112661504A[P]. 2021.

[2] Chen Liangxing, Liang Pengwei, Wang Hao, et al. A zirconia immersion coloring dyeing method:, CN109734444A[P]. 2019.