Thaum koj lossis ib tus neeg hauv tsev neeg xav tau kev hloov pauv, kho hniav, lossis pob txha phaj, koj tus kws kho mob feem ntau yuav hais ib lo lus:titanium alloy. Qhov no silvery - hlau dawb, feem ntau hu ua "qhov chaw hlau," tsis tau mus txog rau lub hli xwb, tab sis kuj tau ntsiag to pom nws txoj kev mus rau hauv lub cev ntawm cov neeg suav tsis txheeb, dhau los ua "tus qauv kub" rau orthopedic thiab kho hniav implants. Tab sis dab tsi tiag tiag ua rau nws tshwj xeeb? Niaj hnub no, cia peb tshawb nrhiav qhov zais cia tom qab yuav ua li cas titanium alloy "coexists peace" nrog tib neeg lub cev.
Qhov laj thawj tseem ceeb ntawm titanium alloys tau dhau los ua cov khoom siv rau kev cog qoob loo tuaj yeem suav nrog hauv ib kab lus: lawv txaus "inert."
Ntawm no, "tsawg-kev tu" txhais tau tias yog kev qhuas. Titanium yooj yim tsim ib txheej tuab oxide (titanium dioxide, TiO₂) thaum raug huab cua. Cov txheej no yog qhov ruaj khov heev thiab tiv taus corrosion txawm nyob rau hauv lub cev cov dej ib puag ncig, uas muaj chloride ions thiab muaj kev hloov pauv hauv pH. Qhov no txhais tau hais tias, tsis zoo li tej yam hlau, titanium implants tsis maj mam tso cov teeb meem ions nyob rau hauv lub cev, ua rau mob los yog tshuaj lom. Qhov tseem ceeb tshaj, cov txheej txheem oxide no tiv thaiv tib neeg cov ntaub so ntswg los ntawm "paub" nws li khoom txawv teb chaws. Thaum titanium cog rau hauv cov pob txha cov ntaub so ntswg, osteoblasts tsis tsuas yog tsis kam lees nws tab sis nquag ua raws thiab loj hlob nyob ib puag ncig nws, thaum kawg tsim ib qho kev sib cog lus ncaj qha nrog lub titanium nto. Cov txheej txheem no yog hu ua osseointegration, thiab nws yog qhov tseem ceeb vim li cas cov hniav cog hniav tuaj yeem tiv taus zom zom.
Yog tias lub hom phiaj tsuas yog "nyob ntawm qhov teeb meem," stainless hlau tuaj yeem ua qhov ntawd thiab. Dab tsi ua rau titanium zoo kawg nkaus yog qhov zoo npaum li cas nws cov cuab yeej siv tau zoo sib xws nrog cov pob txha.
Pob txha yog ib qho ntse, nyob hauv cov ntaub so ntswg: nws yuav tsum muaj kev siv tshuab txuas ntxiv los tswj nws qhov ceev. Yog tias ib qho kev cog qoob loo "stiffed," nws yuav "siv" lub zog uas yuav tsum tau yug los ntawm cov pob txha, ua rau cov pob txha nyob ib puag ncig maj mam atrophy vim yog "siv los yog poob nws" txoj cai- qhov no hu ua kev tiv thaiv kev ntxhov siab. Lub moduli ntawm elasticity rau stainless hlau thiab cobalt -chromium- molybdenum alloys yog kwv yees li 200 GPa thiab 220 GPa, feem, uas yog deb tshaj li ntawm tib neeg cov pob txha (kwv yees li 20 GPa). Lub modulus ntawm elasticity rau titanium alloys tuaj yeem ncav cuag 100 GPa, thaum tshiab -titanium alloys tuaj yeem qis li 57-68 GPa, coj lawv los ze zog rau "hardness" ntawm cov pob txha ntuj. Qhov no txhais tau hais tias thaum titanium implants dais qhov hnyav, lawv muaj peev xwm ntau dua ib txwm xa cov neeg kho tshuab stimulation rau cov pob txha ib puag ncig, txo cov kev pheej hmoo ntawm pob txha resorption.
Ib qho feem ntau -pom zoo dua: MRI compatibility. Txhua tus neeg uas tau ua MRI paub tias kev cog hniav hlau hauv lub cev feem ntau tuaj yeem ua rau muaj teeb meem. Txawm li cas los xij, titanium alloys yog qhov "tsis muaj teeb meem" hauv qhov no.
Titanium muaj qhov sib nqus tsis tshua muaj zog heev- qis dua ntawm cov hlau tsis muaj steel thiab cobalt -chromium alloys- ua rau muaj cov khoom cuav tsawg heev thaum MRI scans thiab tsis tshua muaj kev pheej hmoo ntawm kev hloov pauv lossis kub dhau. Ib tsab xov xwm tshaj tawm txog kev tshawb fawb los ntawm West China Stomatological Tsev Kho Mob tau hais meej meej tias cov neeg mob uas muaj titanium kev cog hniav tuaj yeem muaj kev nyab xeeb hauv CT thiab MRI scans. Qhov no yog qhov tseem ceeb rau cov neeg mob orthopedic thiab kho hniav uas xav tau ntev - ua raws li -.
Txij li thaum nws thawj zaug siv hauv orthopedics hauv xyoo 1950, titanium alloy tau siv rau ntau tshaj 70 xyoo. Txhua xyoo, ntau tshaj 1,000 metric tons ntawm titanium cov cuab yeej kho mob tau cog rau hauv tib neeg lub cev thoob ntiaj teb. Nws tsis zoo tag nrho, tab sis nyob rau hauv yuav luag "understated" txoj kev, nws ris hnyav, txav, thiab zom hauv lub cev qhov nyuaj tshaj plaws, ntsiag to txhawb lub neej ntawm suav tsis txheeb.
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