High Permeability Zirconia Ceramics

Kev taw qhia txog cov khoom siv

Under the circumstance that the strength of the first and second generation zirconia has met the clinical needs, further improving the light transmittance of zirconia ceramics has become an urgent clinical need. Cubic zirconia can significantly improve the semi-permeability of zirconia materials and improve its optical properties. Therefore, more stabilizer yttria is added to the third-generation zirconia ceramics, so that in the final sintered full zirconia materials The content of cubic zirconia grains increases; on the other hand, the content of tetragonal zirconia decreases, and the stress-induced transformation toughening mechanism is weakened, so the strength and toughness of the material decrease significantly. This type of zirconia has a dual-phase microstructure composed of tetragonal zirconia and cubic zirconia crystals, and belongs to partially stabilized zirconia. Compared with the first-generation and second-generation zirconia all-ceramic materials, the light transmittance of the third-generation zirconia has been greatly improved, so the third-generation zirconia is also called "high-transmittance zirconia".

Hom no siab {{0}}transmittance zirconia tag nrho-ceramic khoom launched nyob rau hauv 2017 siv 4 mol feem pua ​​yttria ua ib tug stabilizer (4Y-TZP), thiab qhov sib ntxiv ntawm alumina yog tsawg dua 0.05 wt feem pua, los yog yuav luag tsis muaj qhov sib ntxiv, cubic zirconia crystals Cov ntsiab lus ntawm zirconia yog ntau dua 25 feem pua, los yog ntau tshaj 50 feem pua, thiab lwm lub ntsiab siv lead ua theem feem ntau yog tetragonal zirconia, thiab semi-permeability ntawm cov khoom yog txhim khu kev qha, mus txog siab permeability (kev tshawb fawb tau pom tias TP tus nqi ntawm siab -permeability zirconia specimens nrog ib tug tuab ntawm 1.0 hli yog ncav cuag li 30), tab sis nyob rau hauv lub Tib lub sijhawm, cov khoom siv kho tshuab tau txo qis, qhov khoov lub zog yog 500800MPa, thiab cov pob txha toughness yog li 2.23.5 MPa.m1 / 2.

daim ntawv thov

Qhov thib peb -tiam zirconia tag nrho- cov khoom siv ceramic tuaj yeem siv rau kev kho cov anterior tag nrho -zirconia ib lub kaus mom, txuas hniav thiab anterior veneers vim nws cov khoom kho qhov muag zoo, tab sis qhov kev tshawb fawb zaum kawg qhia tau hais tias hom zirconia no tsis tuaj yeem siv rau hauv thaj chaw sab nrauv hauv 5 xyoos Kev siv qee qhov cuam tshuam me me xws li veneers, inlays, thiab onlays yuav tsum tau soj ntsuam kev soj ntsuam, yog li xav tau kev tshawb fawb ntxiv ntawm kev siv cov ntaub ntawv no. .