Vsmile Xaiv Cov Khoom Siv Rau Ib Leeg-Unit Crown anterior

Kev txiav txim siab rau Lithium-Disilicate Crowns

Lithium disilicate yog tam sim no cov khoom siv feem ntau siv rau ib leeg-unit anterior crowns.Vsmile Ingots xovxwm thaiv thiab Cad Block.Qhov txawv ntawm ob cov ntaub ntawv yog qhov qub yog fabricated thaum pre-crystallized ingots yog tshav kub-nias rau hauv pob zeb peev, thiab CAD version yog fabricated thaum ib feem crystallized blocks yog carved rau hauv lawv cov duab kawg nyob rau hauv lub tshuab milling thiab ces tag nrho crystallized nyob rau hauv lub cub tawg. Ntau tus kws kho hniav xav paub txog qhov twg ntawm ob txoj kev tsim khoom ua rau lub kaus mom zoo dua. Cov kev tshawb fawb soj ntsuam kuaj tau tshaj tawm tias ob qho tib si kev tsim cov txheej txheem muaj peev xwm tsim tau cov chaw kho mob tau txais qhov sib txawv me dua 140 µm (nrog rau cov kev tshawb fawb feem ntau qhia ntawm 35 µm thiab 120 µm). Ntawm cov kev tshawb fawb uas tau muab piv rau ob qho tib si fabrication cov txheej txheem ib sab ntawm ib sab, tsis muaj kev pom zoo rau cov txheej txheem uas ua rau me me qhov sib txawv. Peb txoj kev tshawb fawb pom me ntsis me me me me qhov sib txawv nrog cov cua kub-nias, thiab ob txoj kev tshawb fawb pom me ntsis me ntsis marginal gaps nrog milling. Hauv peb qhov kev paub dhau los, txawm li cas los xij, nias lithium-disilicate restorations ntau txhim khu kev qha tsim cov npoo. hais txog lub zog, tsis muaj qhov sib txawv ntawm cov ntaub ntawv siv rau ob qho tib si fabrication txheej txheem.

Cov ntaub ntawv no kuj muaj nyob rau hauv twotranslucencies HT [siab translucency, LT [low translucency], Lub translucency ntawm cov khoom yuav tsis raug hloov los ntawm kev sib txawv siv lead ua muaj pes tsawg leeg los yog densityandall translucencies ntawm lithium disilicate muaj ib tug zoo xws li lub zog.

Lithium disilicate yog translucent txaus uas nws yuav siv tau los ua cov khoom siv monolithic. Hauv peb qhov kev paub dhau los, txawm li cas los xij, kev txiav rov qab rau ntawm lub ntsej muag ntawm lub ntsej muag thiab / los yog incisal ntug nrog ib txheej ntawm cov plooj (porcelain) feem ntau xav tau kom tau txais cov yam ntxwv tsim nyog rau ib qho anterior crowns. Ib qho kev sim kuaj tau tshaj tawm tias 2-mm-thick lithium-disilicate crown nrog 0.7-mm txiav-rov qab tau pom tias txo qis zog ntawm 33% thaum thauj khoom ntawm thaj tsam ntawm kev txiav rov qab.Qhov chaw ntawm qhov txiav-rov qab, yog li ntawd, yuav tsum tau tham nrog lub chaw kuaj mob.

Kev txiav txim siab rau 4Y / 5Y Zirconia Cov Khoom

Raws li tau hais dhau los, tam sim no muaj ntau cov qauv ntawm zirconia muaj nyob rau hauv uas tuaj yeem siv rau monolithic anterior restorations. Qhov nce translucency ntawm zirconia yog ua tiav los ntawm kev nce qhov sib piv ntawm cubic rau tetragonal theem hauv zirconia. Cubic zirconia yog translucent ntau tshaj li tetragonal zirconia vim hais tias kev npaj ntawm atoms nyob rau hauv lub cubic theem yog optically isotropic, los yog symmetrical. Qhov no txhais tau hais tias lub teeb tuaj yeem dhau los ntawm ntau qhov sib txawv yam tsis tau nres lossis hloov pauv. Tus nqi ntawm cubic zirconia nyob rau hauv zirconia yog txiav txim los ntawm tus nqi ntawm yttria stabilizer nrog lub zirconia. Ntawm 3 mol% yttria (3Y), muaj nyob nruab nrab ntawm 10% mus rau 15% cubic theem; ntawm 4 mol% yttria (4Y), muaj nyob nruab nrab ntawm 25% mus rau 37% cubic theem; thiab ntawm 5 mol% yttria (5Y), muaj nyob nruab nrab ntawm 50% mus rau 58% cubic theem. Yog li ntawd, 4Y zirconia yog 13% ntau translucent tshaj 3Y, thiab 5Y yog 33% ntau translucent tshaj 3Y. 5Y zirconia, txawm li cas los xij, tseem tsawg dua li cov lithium disilicate. Txawm hais tias translucency yog ntshaw kom ua raws li ntuj enamel, cov xwm txheej sib txawv yuav xav tau ntau qib ntawm translucency / opacity.

Qhov nce translucency ua tiav los ntawm kev sib pauv tetragonal zirconia rau cubic zirconia los nrog kev lag luam hauv cov khoom siv tshuab. Tetragonal zirconia muaj peev xwm ntawm kev hloov pauv toughening, muaj peev xwm los nres qhov kev loj hlob ntawm qhov tawg hauv cov khoom. 3Y zirconia muaj peev xwm ntawm kev hloov pauv toughening. 4Y zirconia undergoes ib co transformation toughening. 5Y zirconia tsis transformation-toughen.Vim li ntawd, lub zog thiab tawg toughness txo los ntawm 3Y zirconia rau 4Y zirconia rau 5Y zirconia. Txawm li cas los xij, 5Y tseem muaj lub zog ntau dua thiab tawg tawv dua li lithium disilicate.

Qee qhov xwm txheej kho mob muaj nyob rau hauv uas 4Y lossis 5Y zirconia muaj qhov zoo ntawm kev kho mob lithium disilicate. Ua ntej, 4Y lossis 5Y zirconia tej zaum yuav yog ib qho kev xaiv rau cov kws kho mob uas xav ua kom lawv cov yas tsis muaj kev sib txuas, tshwj xeeb yog tias cov thickness ntawm cov yas qis dua qhov tsawg kawg nkaus pom zoo thickness rau cov pa cementation ntawm lithium disilicate. Qhov kev pom zoo no yog raws li kev tshawb fawb tsis ntev los no uas tau tshaj tawm tias txawm hais tias lub zog ntawm 5Y zirconia thiab lithium-disilicate crowns (nrog 0.8-mm txog 1-mm thickness) yog sib npaug yog tias cov yas tau khi nrog cov cement resin yog tias cov yas tau cemented nrog cob. -hloov iav-ionomer cement, 5Y zirconia outperformed lithium disilicate. Cov lus qhia no yuav tsum tsuas yog ua raws li qhov tsis muaj zirconia chaw tsim khoom' cov lus pom zoo, uas pab pawg kho kom zoo yuav tsum ua raws li txhua lub sijhawm. Lub zog ntawm cov khoom siv yas kuj ua rau cov ntaub ntawv no ntau dua cov neeg siv khoom ua ntej kev sib txuas, vim tias lawv lub zog tsis yog nyob ntawm kev sib txuas rau cov qauv hniav lithium-disilicate cov ntaub ntawv. Lub zog no tshwj xeeb tshaj yog muaj txiaj ntsig zoo los tiv thaiv kev tawg ntawm ceramics thaum lub sij hawm sim nws.

Thib ob, 4Y zirconia tuaj yeem muab cov txiaj ntsig zoo thaum qhov ntev ntawm kev kho dua qhov kev txwv rau qhov kev sib txuas rau cov hniav txhawb nqa cov khoom siv.Cov duab hauv qab no qhia 4Y zirconia anterior crowns, uas tau xaiv los txo qhov muaj feem cuam tshuam ntawm kev sib tsoo ntawm qhov ntev incisal npoo.

Cov ntsiab lus

Qhov kom zoo dua ntawm kev siv 4Y lossis 5Y zirconia yog tias nws tsis tshua muaj kev puas tsuaj hauv kev sim, uas tej zaum yuav muaj teeb meem nrog lithium disilicate nyob ntawm qhov kev txawj ntse thiab kev paub ntawm tus kws kho mob, thiab muaj ntau yam uas yuav tsum tau cemented nrog ntau yam. hom cement, tsis yog sib koom ua ke.