Tsob Ntoo Dawb Zirconia

Kev taw qhia txog cov khoom siv

In the past two decades, tetragonal zirconia (3 mol percent Yttria stabilized Tetragonal Zirconia Polycrystals, 3Y-TZP) has gradually become the mainstream ceramic material for dental restoration due to its very good mechanical properties, especially with the development of computer aided design and computer aided manufacturing(CAD/CAM). The popularization and application of technology in oral restoration can digitally compensate the sintering shrinkage of zirconia, and the size of the restoration can be controlled more accurately, so that the all-ceramic restoration technology has gradually developed rapidly and is widely used in clinical practice, especially for the production of multi-unit full-scale posterior teeth. Restoration of the Porcelain Long Bridge. This zirconia all-ceramic restoration material is the first type of zirconia that restorers come into contact with. Because this zirconia ceramic is mostly chalky, it is called "white zirconia".

The white zirconia all{{0}}ceramic material uses 3 mol percent (5.2 wt percent ) yttrium oxide (Y2O3) as a stabilizer, adds 0.25{{10}}0.5 wt percent alumina as a flux, and the main crystal phase is tetragonal zirconia (3Y- TZP) with grain size ranging from 0.5 μm to 1.0 μm. In this multiphase polycrystalline ceramic structure, due to the large refractive index (2.20) of zirconia, which does not match the refractive index of the glass matrix (1.50), the size of the crystals is larger than the wavelength of the incident light, in addition to the non-cubic phase zirconia The crystal itself is a birefringent crystal, and the incident light is scattered at the grain boundaries, pores, additives, etc., so this traditional zirconia ceramic material has poor semi-transparency and high resistance to light. However, because the main crystal phase 3Y-TZP has the effect of phase transformation and toughening, the first-generation zirconia all-ceramic materials have high strength and high fracture toughness. The bending strength is generally as high as 10001500 MPa, and the fracture toughness is about 3.54.5 MPa .m1/2.

Daim ntawv thov kho mob

Dawb zirconia feem ntau yog siv los ua cov khoom siv coronal rau kev kho dua tshiab ntawm tag nrho cov crowns los yog tag nrho cov -ceramic txuas hniav, thiab ua ke nrog sintered nto veneer plooj (veneer porcelain) kom tau txais kev zoo nkauj zoo nkauj, nws tuaj yeem siv rau kev kho dua tshiab ntawm ib lub crowns thiab ruaj khov. txuas hniav ntawm cov hniav anterior thiab posterior. Qhov sib txuam thiab ua ke ntawm cov yas thiab cov plooj (veneer veneer) muaj kev pheej hmoo ntawm cov plooj (porcelain chipping), thiab qhov tshwm sim ntawm cov plooj (porcelain chipping) tseem siab dua li cov plooj (porcelain) -fused- mus rau - hlau tag nrho cov yas kho . Tam sim no, hom zirconia dawb no tau maj mam thim tawm ntawm kev ua lag luam.

Cov khoom sawv cev

Cov neeg sawv cev ntawm thawj tiam ntawm zirconia ceramics suav nrog Lava Ncej (3M ESPE), KaVo Everest ZH (KaVo Dental), Vita YZT (Vita Zahnfabrik), Zenostar MO (Wieland Dental), thiab lwm yam.