Vim li cas Porcelain Crowns Txhim Kho Cov Kab Ntsig?

Vim li cas porcelain crowns txhim kho cov kab nrib pleb?

Kev tawg ntawm cov plooj (porcelain) tuaj yeem tshwm sim los ntawm ntau yam, tab sis feem ntau tshwm sim los ntawm kev ntxhov siab uas tau teeb tsa thaum tua hluav taws / txias. Nrog hlau-ceramic restoration, coefficients ntawm thermal expansion ntawm cov hlau thiab porcelain yuav tsum zoo sib xws, los yog thaum lub restoration txias, cov hlau thiab cov plooj (porcelain) yuav txias ntawm cov nqi sib txawv, ua rau cov pob txha me me hauv cov plooj (porcelain). Cov chaw tsis muaj zog no tuaj yeem ua rau muaj kev sib tsoo hnyav ntawm qhov chaw, uas tuaj yeem ua rau cov kab nrib pleb, lossis loj hlob.

Lwm qhov laj thawj rau kev tawg yog yog tias thaj tsam tuab ntawm cov plooj (porcelain) tsis muaj kev txhawb nqa los ntawm cov hlau substructure. Nyob rau hauv cov ntaub ntawv ntawm cov hlau-ceramic restoration, lub feldspathic porcelain uas yog ci rau cov hlau substructure yuav tsum muaj kev txhawb nqa los ntawm cov hlau los tuav nws lub zog. Yog tias cov plooj (porcelain) raug coj mus rau thaj chaw sib cuam tshuam, piv txwv li, uas yog ntau tshaj 2 hli dhau qhov kev txhawb nqa ntawm cov hlau, nws yog qhov ua rau tawg. Porcelain muaj zog heev nyob rau hauv compression, tab sis shear los yog tensile rog tuaj yeem tawg qhov kev kho dua tshiab. Koj yeej yuav tsum tham nrog koj lub chaw kuaj xyuas kom paub tseeb tias lawv siv cov hlau thiab cov plooj (porcelain) uas ua kom sov thiab txias ntawm tib tus nqi, thiab lawv tau xyuam xim rau kev tsim cov hlau uas lawv tsim.

Ib txoj hauv kev los kho cov kab npauj npaim, ib qho uas tuaj yeem tawg rau hauv tus neeg mob lub qhov ncauj, uas koj pom ua ntej cementation, yog rov tua hluav taws. Craze kab tuaj yeem kho lawv tus kheej yog tias cov plooj (porcelain) raug tso cai rov ua dua tshiab.

All-ceramic restorations tawg rau ntau yam. Yog tias koj siv lithium disilicate, zirconia lossis lwm yam ceramic uas yog hom "monoblock", nco ntsoov tias kev kho dua tshiab yog tuab txaus. Ua tib zoo mloog cov chaw tsim khoom cov lus qhia rau qhov tsawg kawg nkaus thickness. Kev puas tsuaj kuj tuaj yeem tshwm sim hauv zirconia restorations qhov twg zirconia yog cov tub ntxhais thiab leucite-reinforced ceramic yog ci rau ntawm zirconia core. Cov pob txha tawg no tshwm sim rau cov laj thawj zoo sib xws rau cov hlau-ceramic restorations.