Qu'est-ce que la zircone ?

Zirconia is an exceptional material, featuring strong strength, hardness and durability at high temperatures with an extremely high melting point and stability at higher temperatures. Furthermore, its good ionic conductivity and wear resistance make it suitable for refractory products, ceramic colors & pigments as well as automotive components, oxygen sensors & fuel cells.

Aluminum is also an ideal material for dental applications, with milling capabilities to mill precise shapes to match individual patients’ teeth, providing superior aesthetics.

It is a hard material

Zirconium is an extremely hard metal that’s highly corrosion-resistant and comparable to steel in many ways. This material has proven popular as the material for dental and surgical implants due to its superior strength, stability, and scratch resistance properties; other uses for it include lamp filaments and jet engines as well as jewelry applications. Zirconium’s versatility extends far beyond these uses though; it can also be found in abrasives, lamp filaments, jet engines, lamp filaments and filaments for light bulbs – however; while most commonly found as jewelry pieces!

Zirconia, an inorganic compound composed of zirconium and oxygen with a similar crystal structure to quartz, cannot be found naturally but must be produced through complex physical-chemical processes. Although not found naturally, zirconia boasts outstanding biocompatibility as it does not absorb into bloodstream, making it suitable for medical prosthetic applications. Furthermore, it has excellent acid and alkali resistance as well as temperature tolerance up to 1,400degC making it suitable for use as medical prosthetic material.

Zirconia’s properties vary depending on its fabrication method, with milling employing CAD-CAM technology for creating restorations from full-contour solid zirconia restorations. Unfortunately, this method results in structural shrinkage which must be partially compensated at design time but which still compromises mechanical reliability; additionally it may create numerous flaws which weaken final restoration strength [3].

Full-contour solid or monolithic zirconia pucks can be milled from fully sintered blocks using milling machines, then transformed into dental restorations using CAD-CAM technology. This restoration boasts high flexural strengths of 1,100 to 1,200 MPa with increased design flexibility and its dimensions can be tailored according to patients’ bites for improved abutment fit and esthetics.

Pure zirconia exists as a metastable tetragonal phase at room temperature, but can be stabilized to achieve cubicity with various amounts of yttrium and cerium additives. Stabilized tetragonal zirconia offers superior toughness but lower translucency; in dental applications this material may be known as partially stabilized zirconia (TZP) or polycrystal zirconia (TZC), respectively. For greater transparency and increased fracture toughness YSZ is more transparent yet offers better fracture toughness compared with its counterpart.

It is a light material

Zirconia has become increasingly popular as a medical prosthetic material due to its exceptional strength. Additionally, its smooth surface makes it more visually appealing than porcelain or composite restoration materials like composite resin. Furthermore, this inert material does not react with bodily fluids, offers greater fracture resistance than most materials and even outshines some metals when tested for strength – making Zirconia perfect for use in wristwatches, knives, jewelry pieces, valves and pumps thanks to both its strength and beauty.

Zirconia first emerged as a dental material decades ago, but was not initially pleasing to the eye and required additional steps to achieve an esthetically pleasing result. Nowadays, several formulations exist with various levels of translucency and strength – the first generation being 3Y which was tetragonal and relatively strong (1000 MPa), however due to high yttria content limiting translucency; later generations such as 5Y and 4Y were developed with lower yttria content but higher translucency; third and forth generation zirconias came about through 5Y and 4Y developments with reduced yttria content while simultaneously increasing translucency for increased translucency as well.

Zirconia’s low thermal conductivity enables it to withstand higher temperatures than other dental ceramics, reaching 700degC without cracking or breaking. Furthermore, this heat resistant ceramic has found use as an insulator of fuel cells and semiconductors; furthermore its low thermal conductivity allows it to serve as a protective barrier coating against engine wear caused by oxidation and erosion.

Zirconia stands out among other materials due to its lightness. When compared with porcelain, zirconia is three times lighter while still providing strength – providing great advantages for patients concerned about weight.

Zirconia is typically produced in pucks or blocks that are milled into individual restorations before being sintered at an optimal temperature, creating dense, strong, biocompatible material with reduced porosity that reduces translucency. Furthermore, structural defects and impurities absorb or scatter light instead of passing through it reducing transparency further – factors which can be mitigated by choosing high-translucent zirconia formulations and optimizing their sintering temperature.

It is a strong material

Zirconium is an extremely robust metal found naturally as the zircon mineral in ocean waters and sands. Not affected by acids or alkalis, and heat resistant, zirconium finds use in ceramics, abrasives, lamp filaments, jet engines and space shuttle parts; additionally it is increasingly being utilized in dental restoration due to its biocompatibility, durability and esthetics properties.

Zirconia differs from other technical ceramics in being both strong and durable; its wear resistance and fracture toughness make it an attractive option for treating tooth decay or bruxism, among other conditions. Furthermore, zirconia’s versatility enables its use in both cosmetic and conservative preparations.

Zirconia is an ideal material choice for full-contoured crowns and bridges due to its strength. However, selecting high-quality yet esthetic zirconia material will produce optimal results. At Dandy Dental Design Group’s dedicated CAD design team we prioritize proper spacing and alignment which reduces the risk of damaging neighboring teeth as well as our digital workflow that allows close collaboration between dentists and patients ensuring the restoration is tailor-made specifically to you and meets all your requirements.

Zirconia is an excellent material for creating aesthetic restorations, yet not as translucent as traditional porcelains. Therefore, selecting a formulation with greater translucency would be especially useful when dealing with anterior restorations or pre-molars where more sound tooth structure needs to be extracted for thicker walls.

Zirconia offers another advantage with its low thermal conductivity, making it the ideal material for thermal barrier coatings in jet and diesel engines, infrared laser treatment applications, as well as infrared and laser imaging technology applications.

Zirconia materials used in dentistry include yttrium-stabilized tetragonal zirconia polycrystal (TZP) and cerium-stabilized tetragonal ziconia polycrystal (Ce-TZP), both offering exceptional tensile strength, fracture toughness, and flexural modulus; moreover they’re more stable than traditional porcelains when exposed to stress caused by chewing as well as para-functional habits like clenching and bruxism.

It is a durable material

Zirconia is an extremely durable material for dental restorations, especially when used to rebuild damaged teeth. Ten times stronger than porcelain and capable of withstanding extreme amounts of bite force. Furthermore, this highly biocompatible material resists plaque and inflammation and integrates well into natural tooth structures – making zirconia an appealing alternative to more conventional restorative materials such as gold and resin – due to its exceptional flexural strength that withstands high levels of traction traction as well as providing exceptional fracture resistance.

Zirconium’s rising importance in nuclear industry research has spurred considerable advances in zirconium metallurgy research. Applications include fuel cells, oxide-based oxygen sensors and ceramic membranes used for electrochromic devices. Zirconium’s excellent electrical conductivity makes it an attractive material choice.

Stabilized zirconia exists in three phases, and these can be separated into cubic phase (C), tetragonal phase (T), and monoclinic phases with parallelepiped sides. Tetragonal phase metastability at room temperature allows it to transition to monoclinic via stress triggers; monoclinic has lower mechanical properties than its counterpart and less dense properties than tetragonal.

Sintering zirconia requires setting both temperature and time parameters at which critical crystal sizes emerge, with larger crystal sizes offering improved mechanical properties while smaller grains increasing porosity and decreasing durability. Usually the critical grain size lies around 1 micrometer.

Zirconia durability is significantly affected by its content of yttrium, as its presence reduces tetragonal phase transformation rates while strengthening monoclinic phase stability, creating stronger, clearer material. Typically, this percentage ranges between 3-5%.

Addition of yttrium increases bond strength between zirconia and resin cement, an essential factor for durable dental restorations. Sandblasting zirconia surface before porcelain veneering or resin cementing facilitates this bonding by exposing tetragonal nanoporosity and creating reactive surface that enhances wetting and bonding with resin cement. Selective infiltration etching (SIE) is another technique that can strengthen bonds between zirconia and resin cement.