Cov khoom sib xyaw ua ke hauv cov ntaub ntawv kho hniav yog ib qho muab tub lim -cov khoom siv polymer-raws li cov khoom sib xyaw, uas yog cov txheej txheem sib xyaw ua ke uas muaj cov organic resin matrix, ib qho inorganic muab tub lim, thiab cov txheej txheem pib.
Bonding yog qhov yuav tsum tau ua ua ntej rau kev ua kom zoo zoo, vim tias nws cuam tshuam rau cov hniav tom qab phais, sau lub cev poob, cov kab mob hauv nruab nrab thiab lwm yam teeb meem. Tam sim no, muaj ntau hom adhesives nyob rau hauv kev ua lag luam, tab sis qhov sib txawv ntawm txhua tiam yog yeej: txoj kev los kho cov smear txheej yog txawv, yog li cov khoom ntawm cov mix txheej kuj txawv, thiab qhov kawg entanglement yog lub zog sib txuas, postoperative rhiab heev, thiab cov khoom decomposition. Tab sis kev sib txuas ua haujlwm yog qhov zoo ib yam, tsis muaj ntau qhov txawv txav, thiab cov ntsiab lus ntawm daim ntawv thov nplaum yuav tsis paub meej.
Etching hniav enamel thiab dentin yog lub hauv paus ntawm kev sib txuas. Nyob rau hauv cov ntaub ntawv ntawm tag nrho cov kua qaub etching technology, cov hniav nto yog kho los ntawm kev siv phosphoric acid uas muaj 20-37%.
Kev siv phosphoric acid etching tus neeg sawv cev rau cov hniav ntxhib ntxhib ntxhib yuav ua rau qhov chaw nthuav tawm cov qauv ntxeem tau nrog qhov tob ntawm ob peb micrometers, yog li ua rau thaj chaw sib cuag ntawm lub cev hniav. Qhov no feem ntau paub kho raws li cov hniav enamel etching thiab ziab. Tom qab lub chalk ntxhw. Cov tsos ntawm cov qauv saum npoo no yog tshwm sim los ntawm qhov sib txawv solubility ntawm qhov chaw nruab nrab thiab ntug ntawm tus ncej glaze.
Cov nplaum tuaj yeem muab tso ua ke thiab npog tag nrho saum npoo tom qab acid etching. Tom qab lub binder yog polymerized, ib tug nruam bonding txheej yog tsim, uas yog lub hauv paus rau kev sib xyaw ntawm resin thiab binder.
Feem ntau siv 20% etching tus neeg sawv cev, enamel acid etching rau 20s, thiab dentin acid etching rau 15s. Ua tib zoo yaug cov hniav saum npoo kom tiv thaiv cov etching tus neeg sawv cev los ntawm qhov seem ntawm cov collagen fiber ntau thiab zam qhov teeb meem ntawm dentin tom qab kev ua haujlwm rhiab heev. Siv rab phom cua kom maj mam tshuab cov dej ntau dhau. Nws yuav tsum tau muab sau tseg tias tsis txhob ua rau lub rhiab heev dentin qhuav, ua rau lub collagen fiber ntau vau. Tom qab ntawd, siv cov txhuam me me los txhuam cov nplaum rau ntawm qhov chaw cov hniav thiab cov hniav thiab siv peb txheej (peb zaug), feem ntau 15-20s, thiab tom qab ntawd sawv ntsug rau 15s (tso tawm lub primer thiab dentin cov tshuaj tiv thaiv lub sij hawm) tshuab nyias primer (cov nplaum tuab heev yog feem ntau to me ntsis).
Thaum siv cov nplaum, rov ua dua maj mam rub ntawm lub dentin pab txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau nws yuav tsum tau ua tib zoo saib xyuas cov enamel. Nyob rau hauv lub sij hawm teev, tshuab maj mam nrog ib rab phom cua kom volatilize cov kuab tshuaj (dej, ethanol).
Yog tias cov khoom siv nplaum tsis ntws ntawm cov hniav thiab tsim cov yeeb yaj kiab du, nws txhais tau hais tias tag nrho cov txheej txheem ua haujlwm yog qhov tseeb. Tom qab lub teeb curing rau 20 vib nas this, ib qho kev sib txuas zoo yog tsim. Cov txheej txheem oxygen rau ntawm qhov chaw ntawm kab noj hniav nthuav tawm glossy nto. Sau nrog resin. (Uncured monomer muaj pulp toxicity).
Wet bonding thev naus laus zis yog tam sim no dav siv kev sib txuas tshuab. Nws txoj kev xav yooj yim yog tias thaum lub dentin ntub dej, cov collagen fibers tau ncav cuag, thiab cov nplaum tuaj yeem nkag mus rau hauv qhov khoob ntawm cov collagen fibers los tsim cov txheej txheej sib xyaw ntawm cov tuab tuab, uas tuaj yeem pom tseeb ua kom muaj zog ntxiv.
