Lub Evolution ntawm Zirconia hauv Dental Laboratory

Zirconia restorations dominate niaj hnub kho hniav kho hniav, overtaking tsoos porcelain -fused- mus rau -hlau (PFM) cov khoom. Cov ntaub ntawv kho hniav tshiab tshaj plaws hauv kev lag luam qhia pom zirconia crown thiab choj kho dua tshiab rau ze li 80% ntawm tag nrho cov kev txiav txim kho hniav ruaj khov thoob ntiaj teb. Kev hloov pauv tag nrho los ntawm cov hlau-raws li kev kho dua tshiab rau tag nrho- ceramic zirconia cov kev daws teeb meem rov ua haujlwm txhua hnub ntawm cov chaw kho hniav thoob ntiaj teb. Taug qab cov kev hloov pauv ntawm kev kho hniav zirconia pab cov chaw sim thiab cov khoom siv nkag siab cov kev xav tau ntawm kev lag luam tam sim no thiab cov kev lag luam yav tom ntej.
Thawj tiam: Siab-Lub zog Tab sis qis-Zirconium Translucency
Zirconia thawj zaug nkag mus rau hauv kev kho hniav raws li ib feem ntawm qhov siab -lub zog Hauv -Ceram ceramic system launched los ntawm Vita Zahnfabrik. Formulated nrog zirconia thiab alumina composite Cheebtsam, cov khoom mus txog ib tug flexural zog ntawm 700MPa. Daim duab no yuav luag ob npaug ntawm cov neeg kho tshuab kev ua tau zoo ntawm cov iav ceramics, xa cov qauv kev txhawb nqa rau kev kho hniav tom qab uas dais hnyav occlusal quab yuam.
Thaum ntxov zirconia cov ntaub ntawv tuaj nrog pom tseeb kev txwv. Compact internal siv lead ua qauv txwv lub teeb kis tau tus mob. Kev ua kom zoo nkauj tsis zoo tau txwv cov khoom no rau tom qab lub kaus mom thiab txuas hniav nkaus xwb. Tsis muaj lub chaw kuaj mob tuaj yeem siv lawv rau cov rooj plaub zoo nkauj sab nrauv, txwv tsis pub siv daim ntawv thov thiab qhov chaw tau txais txiaj ntsig ntawm zirconia rov qab los rau lub sijhawm ntawd.
CAD/CAM Technology Boosts Zirconia Kev Lag Luam Txhim Kho
Kev siv dav dav ntawm kev kho hniav CAD / CAM milling tshuab coj cov kev hloov pauv hloov mus rau zirconia ntau lawm. Tsis siv neeg cov kev ua digital hloov cov txheej txheem phau ntawv txheej txheem thiab cov txheej txheem sintering. Kev tsim ntau ntawm millable zirconia blanks txiav phau ntawv yuam kev thiab luv luv ntau lawm voj voog.
Tshiab ua ntej -sintered zirconia cov qauv thawb flexural zog dhau los 1000MPa, deb tshaj alumina thaum ntxov-zirconia cov ntaub ntawv sib xyaw. Lub zog ua tau raws li qhov ntev - lub sij hawm occlusion xav tau ntawm ntau- chav tsev txuas hniav tom qab thiab tag nrho -contour crowns. Tsawg translucency tseem muaj nyob rau theem no. Feem ntau cov chaw kho hniav tau txais cov txheej txheem porcelain veneering ntawm zirconia substructures. Kev sib xyaw ua ke khaws cia zirconia lub siab txhua yam ruaj khov thiab ntxiv cov plooj (porcelain) zoo nkauj, npog ob qho tib si sab hauv thiab tom qab kho mob.
Kev lag luam ntawm Presintered Yttrium-Stabilized Zirconia
Cov npe loj thoob ntiaj teb suav nrog 3M Lava, Vita thiab Dentsply tau tsim qauv yttrium ib nrab-stabilized zirconia blanks. Cov khoom ua ntej -sintered zirconia no tau txais kev nyiam nyob thoob ntiaj teb cov chaw kuaj hniav. Uniform ua ntej-sinter ntom thiab ruaj khov shrinkage tus nqi coj raws li qhov tseeb haum. Tej yam yooj yim milling thiab sintering ua hauj lwm txo qis kev pib rau me me thiab nruab nrab-labs loj.
Optical defects tseem yog lub hauv paus tseem ceeb ntawm kev lag luam zirconia thaum ntxov. Ib leeg siv lead ua qauv tsis muaj cov hniav zoo nkauj txheej txheej. Cov kws tshaj lij ceramists tseem nyiam phau ntawv porcelain txheej txheej ntawm zirconia moj khaum. Los ntawm txhais tes layering compensated tsis txaus translucency thiab vividness, tsim restorations nrog tej yam ntuj tso hniav zoo nkauj. Cov theem no tau ua tiav qhov kev hloov pauv ntawm cov hlau alloy substructures. Zirconia tau dhau los ua cov ntsiab lus tseem ceeb uas tsis yog- cov khoom siv hlau rau txhua qhov kev txhim kho sab hauv thiab tom qab.
Niaj hnub nimno Zirconia Iteration: Kev daws qhov teeb meem ib txwm muaj rau Labs
Tom qab ntau tiam neeg ntawm kev iteration, niaj hnub kho hniav zirconia tshem tawm qhov tsis zoo ntawm cov khoom thaum ntxov. Tam sim no upgraded zirconia blanks txais optimized hmoov mis thiab siab -siab isostatic pressing technology. Batch sib xws nyob ruaj khov, nrog kev ruaj khov sintering shrinkage ntawm 19% -22%. Tsis tas yuav tsum tau hloov kho parameter dua thaum lub sij hawm loj milling thiab sintering, txo cov nqi rework.
Ntau cov qhab nia series npog ntau hom kev kho mob xav tau. Siab -Zirconium zog tuav 1200MPa + flexural zog rau tag nrho - koov txuas hniav thiab cov neeg mob bruxism. Gradient translucent zirconia ua tiav 41% -55% lub teeb xa tawm, sib piv cov txheej txheem txheej txheej ntuj. Niaj hnub no zirconia tsis tso siab rau cov plooj (veneering) veneering. Tag nrho -contour monolithic zirconia restorations txo cov kauj ruam ua, txuag nqi zog thiab tsis txhob veneer tev thiab tawg ib txwm nyob rau hauv cov tsoos txheej restoration.
Raws li cov kws tshaj lij zirconia cov chaw tsim khoom, peb ua raws li kev lag luam cov kev hloov kho dua tshiab. Peb tag nrho -series zirconia blanks hloov mus rau tag nrho cov mainstream CAD/CAM qhuav milling li. Kev ua haujlwm ruaj khov milling tsis txhob cuam tshuam thiab tawg thaum lub sij hawm siab - txiav ceev. Ua tiav qhov ntxoov ntxoo thiab cov kev xaiv translucency txhawb kev tsim cov chaw sim los ntawm ib qho kev zoo nkauj anterior crowns kom puv -arch functional restorations. Cov ntaub ntawv hloov kho dua tshiab daws qhov qis- cov ntsiab lus mob siab ntawm zirconia thaum ntxov, pab cov chaw kuaj mob kom ntes tau siab dua- kawg kev kho kom zoo nkauj hauv kev sib tw ua lag luam