Product Details
ST+—White Zirconia Disc Zirkonzahn System (95mm) zirconia block 95
A password that gives the patient a natural smile
The crowns by Beautyzir ST+ zirconia block 95 contain no metal lining at the gums. Porcelain fused to metal (PFM) crowns actually possess a metal layer underneath the porcelain layer at the top of the crown. This metal lining is usually visible at the gum line and can be seen when patients smile. This can be embarrassing for patients who want a natural-looking smile. Beautyzir ST+ zirconia block 95 crowns avoid the metal lining completely and allow patients to smile with confidence. Additionally, By Beautyzir dental laboratory equipment， crowns can be manipulated to fit any size or shape to match the rest of a patient’s teeth.
Indications
Thickness
Translucency
Chemical Composition
Suggested crystallization curve
Extended reading：
Can zirconia teeth cause excessive wear?
With the development of dental materials and the improvement of people's aesthetic needs, zirconia restoration has become the mainstay of all ceramic restoration in recent years. Especially in recent years, with the development of high-permeability and ultra transparent zirconia, these zirconia materials gradually make doctors and patients choose them as single material full crowns (commonly known as: full zirconia crowns) because of their increasingly improved light transmittance, aesthetic effect and their own excellent fracture toughness and flexural strength.
All zirconium crown has many obvious advantages by virtue of its material itself, such as good strength, high hardness, good wear resistance and so on. However, many doctors believe that zirconia materials will have high wear on natural enamel and even other jaw restorations because of their higher hardness and strength.
But is this really the case?
Zirconia is indeed a very hard material. People may intuitively think that the higher the hardness, the more abrasion will be caused to the enamel. However, the result of wear is mainly determined by the smoothness of the material. A smooth surface will not cause excessive wear, because there is not much mechanical interlock between two worn objects.
It was found that the abrasion of polished zirconia on enamel was lower than that of veneered porcelain crowns
In the above experimental results, we can see lava tested immediately after polishing ™ Zirconia has low abrasion on enamel)
But what is the long-term effect? Is the surface of zirconia still smooth after long-term use?
We still need to look at the data, as follows:
In order to investigate this problem, the University of Alabama at Birmingham (Figure 2) investigated the wear behavior of accelerated aging zirconia materials on enamel: "the zirconia after aging simulation has a similar roughness and wear degree as before. At the same time, the wear of zirconia before and after aging on enamel is less than that of decorative porcelain crowns or natural enamel.
I believe you have a certain understanding of the wear of zirconia. Clinically, as long as we polish zirconia as required, we can achieve low abrasion of enamel.
So, how should zirconia be polished clinically?
1. We can adjust and trim the occlusion with a red marked emery needle (30 microns) and cool it with water according to the inspection of occlusion;
2. After proper grinding and finishing, use the professional zirconia polishing needle set on the market to achieve high gloss polishing. (please operate according to the operating instructions of the corresponding manufacturer to meet the requirements)
Finally, there will still be some doctors' questions. What Xiaobian shared with you before is the wear data of zirconia laboratory. Is there any real clinical experimental research results supporting the low wear of polished zirconia?
Here comes our colorful egg at the end of the article, to share with you a two-year clinical wear Research Report on the all zirconium crown on IADR in 2015, to understand how zirconia behaves in the mouth.
(the above table shows the maximum vertical wear height µ m of different friction materials that are grinded with zirconia crown in 1 and 2 years)
The left picture shows the differential image of the zirconia crown pair of molars (the first mandibular molar as an example) from the initial state to the 12-month follow-up measurement. Software surfer 9 (Golden software, Co, USA) was used to analyze the wear amount of the ground tooth replica. The most severely worn areas are orange and red.
The main conclusions of this clinical report are:
✓ the measured abrasion of enamel and all ceramic is similar to that of other studies, and within the normal physiological range.
✓ there is no significant difference in the abrasion amount between enamel and all ceramic.
✓ zirconia full crown will not cause excessive wear to occlusion in 2 years.
Relevant clinical evaluation:
Esquivel-Upshaw JF, Rose WF Jr, Barrett AA, Oliveira ER, Yang MC, Clark AE, Anusavice KJ. Three years in vivo wear: core-ceramic, veneers, and enamel antagonists. Dent Mater 2012; 28:615-621.
Preis V, Schmalzbauer M, Bougeard D, Schneider-Feyrer S, Rosentritt M. Surface properties of monolithic zirconia after dental adjustment treatments and in vitro wear simulation. J Dent 2014 Stober T, Bermejo JL, Rammelsberg P, Schmitter M. Enamel wear caused by monolithic zirconia crowns after 6 month of clinical use. J Oral Rehabil 2014; 41:314-322.
http://www.zirconiablocks.com/
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