Ceirmeacht Zirconia Ard-thréscaoilteachta

Réamhrá ábhar

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".

Úsáideann an cineál seo ábhar ard-tarchurtha zirconia uile-cheirmeacha a seoladh in 2017 4 mol faoin gcéad yttria mar chobhsaitheoir (4Y-TZP), agus tá an Chomh maith leis an alúmana níos lú ná 0.05 wt faoin gcéad , nó beagnach aon bhreis, criostail zirconia ciúbach Is é an t-ábhar zirconia níos mó ná 25 faoin gcéad, nó fiú níos mó ná 50 faoin gcéad, agus is iad na príomhchéimeanna eile criostail zirconia tetragonal den chuid is mó, agus an Tá leath-thréscaoilteacht an ábhair feabhsaithe go mór, ag baint amach tréscaoilteacht ard (tá staidéir léirithe go bhfuil luach TP na n-eiseamail ard-tréscaoilteachta zirconia le tiús 1.0mm ag baint amach thart ar 30), ach ag an am céanna laghdaítear na hairíonna meicniúla go suntasach, is é 500800MPa an neart lúbthachta, agus tá an toughness briste thart ar 2.23.5 MPa.m1/2.

iarratas

Is féidir an tríú glúin zirconia uile-ábhar ceirmeach a úsáid chun coróin shingil, droichid agus veinírí zirconia roimhe seo a athchóiriú mar gheall ar a dea-airíonna optúla, ach an taighde is déanaí Léiríonn sé go dteipeann ar an gcineál seo zirconia a úsáid sa limistéar roimhe laistigh de 5 bliana Ní mór úsáid a bhaint as roinnt athchóirithe íosta ionracha mar veinírí, inlays, agus onlays a mheas go cliniciúil, mar sin tá gá le tuilleadh taighde ar úsáid fhorleathan na n-ábhar sin .