Zoo, txawm thiab daus-dawb cov hniav - dab tsi yuav ntxim nyiam dua? Tsis xav tsis thoob cov neeg ua yeeb yam, cov nom tswv thiab cov neeg ua haujlwm hauv pej xeem feem ntau siv cov kev pabcuam ntawm kws kho hniav los tsim lub luag haujlwm zoo meej. Tab sis tsis muaj leej twg xav lwj lawv cov hniav los ntawm kev txhim kho crowns. Yog li ntawd, ib txoj kev tshiab ntawm kev kho cov hniav yog tsim thiab siv - nrog kev pab los ntawm veneers. Rau ntau tus neeg, qhov no yog ib hom tshiab ntawm prosthetics. Dab tsi yog veneers thiab dab tsi yog lawv cov nta? Qhov no yog ib txoj hauv kev niaj hnub ntawm kev kho cov hniav txhawm rau txhim kho cov duab, xim thiab zoo li cov hniav. Lub veneer nws tus kheej yog nyias, yuav luag pob tshab phaj.
Muaj ntau hom veneers. Qhov sib txawv ntawm lawv nyob ntawm cov ntaub ntawv uas lawv tau ua: ceramic, composite thiab porcelain. Txhua tus ntawm lawv muaj nws tus kheej zoo thiab qhov tsis zoo. Composite veneers yog qhov yooj yim tshaj los ua. Ib yam li lwm tus, lawv muaj peev xwm kho thiab tshem tawm qhov tsis xws luag ntawm cov hniav sab hauv, tab sis lub sij hawm siv los mus xyuas lub tsev kho mob tsuas yog txwv rau ib hnub.
Composite veneers yog tsim los ntawm cov khoom ntim ncaj qha rau hauv tus neeg mob lub qhov ncauj. Tus kws kho mob kho qhov chaw ntawm cov hniav nrog ib tug tshwj xeeb acid-muaj gel, thiab ces siv txheej los ntawm txheej.cov khoom sib xyaw nws tus kheej. Txhua daim ntawv thov raug kho nrog lub teeb photopolymer. Thaum kawg ntawm txoj kev, cov hniav yog polished. Txhawm rau tsim cov ceramic thiab cov plooj (porcelain onlays), yuav tsum muaj chav kuaj hniav thiab siv sijhawm ntev dua rau lawv cov khoom siv. Ntawm lwm yam, kev ua ntawm cov hniav nto rau cov veneers sib xyaw yog txo kom tsawg. Tsuas yog qhov uas yuav tsum tau kho yog muab.
Kev qhia rau veneers yog:
- qhov chaw nruab nrab ntawm cov hniav;
- chips;
- lub xub ntiag ntawm cov khoom qub uas tau tsaus nti lossis hloov lawv cov xim;
- discoloration ntawm tus hniav nws tus kheej, tejzaum nws yog vim fluorosis;
- tetracycline hniav, thiab lwm yam.
Cov khoom zoo nkauj thiab cov khoom siv ntawm cov khoom sib xyaw veneers ncaj qha nyob ntawm qhov muaj pes tsawg leeg, lossis theej, ntawm qhov loj me ntawm cov khoom nws tus kheej. Ntau daim hlau ruaj khov, uas suav nrog cov khoom sib xyaw ntawm ntau dua 30 microns, nyuaj rau polish thiab sai sai. Overlays nrog microparticle loj ntawm 0.04 microns yog qhov txawv los ntawm cov khoom zoo nkauj zoo nkauj, lawv tau polished zoo kawg nkaus, tab sis lawv tsis yooj yim dua, thiab feem ntau siv rau cov hniav. Raws li ib txwm muaj, nyiam yog muab rau lub ntsiab lus kub, uas yog, cov khoom siv nrog cov khoom siv ntxiv txog 0.15 microns. Cov veneers no muaj zog txaus los zom zoo thiab zoo li tus hniav ntuj.
Thiab tseem, tsis yog txhua tus tuaj yeem muab cov veneers. Contraindications yog tsis kho periodontitis, malocclusion, thinning los yog me me ntim ntawm enamel,hniav sib tsoo cwj pwm (bruxism).
Txawm li cas los xij, cov veneers sib xyaw yog nrov heev rau cov neeg mob. Ntawm lawv qhov zoo dua ceramic thiab plooj (porcelain), nws tsim nyog hais txog tus nqi pheej yig (ntau dua ob zaug pheej yig dua li cov analogues) thiab kev teeb tsa ceev (ua haujlwm yog nqa tawm hauv ib mus ntsib kws kho hniav). Ntau hom xim muaj peev xwm txaus siab rau txhua yam esthete. Nrog kev saib xyuas kom raug, cov veneers yuav nyob twj ywm rau ntau xyoo.
