Vim li cas 17-4 Stainless Steel yog qhov kev xaiv khoom zoo tshaj plaws rau Orthodontic Brackets?

Kev Taw Qhia

Cov khoom siv kho hniav Orthodontic yuav tsum tuav qhov loj me kom raug thaum ua siab ntev rau kev zom, lub zog ntswj, thiab lub voj voog kho mob ntev, yog li kev xaiv cov khoom siv cuam tshuam ncaj qha rau kev ua tau zoo thiab kev ntseeg tau. Ntawm cov hlau alloys muaj, 17-4 precipitation-hardening stainless hlau sawv tawm vim nws ua ke lub zog siab heev nrog kev tiv thaiv corrosion muaj zog thiab kev tsim khoom raug. Cov khoom no pab cov brackets tiv taus deformation, khaws cov geometry qhov, thiab tswj kev qhia txog lub zog ntswj thiab kev txav hniav. Kev nkag siab vim li cas cov hlau alloy no ua tau zoo ua rau cov neeg nyeem pom tseeb dua txog kev tsim bracket, kev nplij siab ntawm tus neeg mob, thiab kev kwv yees tau hauv kev kho mob, teeb tsa cov khoom siv tseem ceeb thiab kev kho mob zoo uas tau tshawb nrhiav hauv seem ntawm tsab xov xwm.

Vim li cas ho xaiv 17-4 Stainless Steel

Cov khoom siv kho hniav orthodontic raug kev nyuaj siab ntau yam thaum lub sijhawm kho, xav tau cov ntaub ntawv uas muaj kev ruaj khov zoo heev. Ntawm ntau yam alloys siv hauv kev tsim khoom orthodontic, 17-4 precipitation-hardening (PH) stainless hlau tau tshwm sim ua tus qauv kev lag luam. Paub txog metallurgically li Hom 630, cov hlau stainless hlau martensitic no muab kev sib xyaw ua ke zoo heev ntawm lub zog siab, kev tiv thaiv corrosion zoo heev, thiab kev tsim khoom meej.

Rau cov ntawv thov orthodontic, cov khoom siv yuav tsum tiv taus cov zog masticatory thiab lub zog torque uas siv los ntawmcov xov hlautsis muaj kev hloov pauv yas.17-4 stainless hlauua tiav lub zog tsim tau zoo kawg nkaus uas tuaj yeem tshaj 1,170 MPa (170 ksi) thaum kho kom sov zoo, xyuas kom meej tias qhov loj me tseem ceeb ntawm qhov bracket (feem ntau yog tus qauv 0.018-nti lossis 0.022-nti systems) tseem ruaj khov thoob plaws lub sijhawm kho mob. Qhov kev ua kom ruaj khov ntawm cov qauv no tso cai rau cov chaw tsim khoom tsim cov brackets qis dua, xis nyob heev yam tsis muaj kev cuam tshuam rau kev ua haujlwm ntawm cov hniav.

Cov txiaj ntsig ntawm kev ntseeg siab hauv kev kho mob

Kev ntseeg tau ntawm kev kho hniav hauv kev kho hniav yog nyob ntawm qhov kwv yees tau ntawm lub zog torque (feem ntau yog txij li -7° txog +22°), lub taub hau, thiab kev txav mus los hauv-tawm uas tau tsim rau hauv daim ntawv qhia kho hniav. Thaum lub qhov ntawm lub bracket deforms nyob rau hauv lub nra hnyav ntawm lub archwire rectangular hnyav, kev txav hniav uas tau teev tseg yuav raug cuam tshuam, ua rau lub sijhawm kho mob ntev dua thiab cov txiaj ntsig tsis tuaj yeem kwv yees tau. 17-4 stainless hlau tiv thaiv qhov kev hloov pauv ntawm qhov chaw no, tso cai rau cov chaw tsim khoom kom tswj tau qhov kev kam rau siab - feem ntau nruj li +/- 0.001 ntiv tes - uas txhais tau tias cov txiaj ntsig kho mob kwv yees tau.

Tsis tas li ntawd xwb, qhov khoom siv uas ruaj khov no txo ​​qhov kev pheej hmoo ntawm kev tawg ntawm cov hlua khi thaum lub sijhawm khi lossis thaum cov neeg mob tom cov khoom noj tawv. Los ntawm kev txo qis kev mus ntsib kws kho mob thaum muaj xwm txheej ceev thiab kev ua tsis tiav ntawm lub bracket, 17-4 stainless hlau muab cov kws kho mob nrog cov khoom siv txhim khu kev qha uas txhawb nqa cov zog biomechanical tsis tu ncua txij li theem pib mus txog rau qhov kawg.

Vim li cas nws ua tau zoo dua li cov hlau tsis xeb dav dav

Cov hlau stainless austenitic dav dav, xws li 304, 316L, lossis cov hlau alloy 18-8 txheem, yog siv dav hauv cov khoom siv kho mob dav dav tab sis tsis zoo rau cov ntawv thov orthodontic uas muaj kev ntxhov siab siab. Qhov txwv tseem ceeb ntawm 300-series stainless hlau yog lawv tsis muaj peev xwm ua kom tawv los ntawm kev kho cua sov; lawv tsuas yog siv kev ua haujlwm txias kom ua tiav lub zog siab, uas feem ntau tsis txaus rau cov khoom me me.

Qhov sib piv, 17-4 stainless hlau dhau los ntawm cov txheej txheem ua kom tawv uas tsim cov qauv martensitic zoo heev. Qhov kev hloov pauv metallurgical no tso cai rau 17-4 kom ncav cuag cov qib hardness txog li 44 HRC (Rockwell Hardness Scale C), ua tau zoo dua li kwv yees li 20-25 HRC ntawm annealed 316L (uas feem ntau tsuas yog 170-310 MPa). Yog li ntawd, 17-4 muab kev ruaj khov zoo dua, tso cai rau kev tsim cov qauv me me, zoo nkauj qhov twg cov alloys dav dav yuav tso tawm lossis tawg hauv qab cov khoom siv kho mob.

Cov Khoom Tseem Ceeb ntawm 17-4 Stainless Steel

Qhov kev ua tau zoo tshaj plaws ntawm 17-4 stainless hlau hauv kev kho hniav yog ncaj qha rau nws cov khoom sib xyaw ua ke thiab nws cov lus teb rau kev ua haujlwm thermal. Cov hlau feem ntau muaj 15.0% txog 17.5% chromium, 3.0% txog 5.0% nickel, thiab 3.0% txog 5.0% tooj liab, nrog rau cov columbium (niobium) thiab tantalum me me. Qhov kev sib xyaw ua ke no tsim cov khoom siv uas sib npaug qhov kev ua haujlwm ntawm cov hlau martensitic nrog rau kev tiv thaiv ib puag ncig ntawm austenitic qib.

Kev nkag siab txog cov khoom no yog qhov tseem ceeb rau Cov Chaw Tsim Khoom Siv Thawj (OEMs) thiab cov kws kho mob ib yam, vim lawv tsis yog hais txog seb lub bracket ua haujlwm li cas hauv qhov ncauj tab sis kuj tseem yuav ua li cas nws tsim, ua tiav, thiab sterilized.

Lub zog, hardness, thiab kev hnav tsis kam

Cov khoom siv kho tshuab ntawm 17-4 stainless hlau tuaj yeem kho tau los ntawm kev kho cua sov tshwj xeeb. Hauv H900 mob (laus ntawm 482 ° C / 900 ° F rau ib teev), cov khoom siv ua tiav lub zog tensile kawg ntawm txog li 1,310 MPa (190 ksi). Lub zog hnyav no yog ua ke nrog kev tawv siab, uas ncaj qha txhais tau tias kev tiv thaiv kev hnav zoo heev.

Hauv cov ntsiab lus ntawm kev kho hniav, kev tiv thaiv kev hnav yog qhov tseem ceeb. Raws li cov hlau tsis xeb, titanium, lossis nickel-titanium archwires swb los ntawm qhov bracket qhov, kev sib txhuam thiab kev hnav khoom siv tuaj yeem hloov qhov loj ntawm qhov chaw dhau sijhawm. Qhov nyuaj siab ntawm 17-4 txo qhov kev hnav abrasive no, tiv thaiv cov archwire los ntawm kev khi lossis notching qhov chaw, yog li ua kom ntseeg tau tiaskev sib txhuam qis-kev sib txhuam sliding mechanicsthoob plaws lub neej kho mob li ntawm 18- txog 24 lub hlis.

Kev tiv thaiv corrosion thiab polishability

Qhov chaw hauv qhov ncauj muaj xeb heev, uas yog tus yam ntxwv los ntawm cov pH hloov pauv (feem ntau poob qis dua pH 5.5 tom qab noj mov), kev ua haujlwm enzymatic, thiab cov dej noo tas li. Cov ntsiab lus chromium 15.0% txog 17.5% hauv 17-4 stainless hlau pab txhawb kev tsim cov txheej oxide ruaj khov, passive uas tiv thaiv cov hlau hauv qab los ntawm oxidation thiab kev tawm tsam corrosive. Txawm hais tias tsis tshua muaj corrosion dua li 316L, 17-4 ua haujlwm zoo heev hauv qhov ncauj, tiv taus tarnishing thiab degradation los ntawm kev noj zaub mov acidic.

Tsis tas li ntawd xwb, qhov ceev thiab cov qauv me me ntawm 17-4 ua rau nws ci ntsa iab heev. Cov chaw tsim khoom siv tau siv cov txheej txheem tiav, electropolishing, lossis mechanical tumbling kom ua tiav qhov roughness ntawm qhov chaw (Ra) qis dua 0.2 micrometers. Qhov tiav zoo li daim iav no yog qhov tseem ceeb rau kev txo cov plaque accumulation, txhim kho kev huv ntawm tus neeg mob, thiab txo cov coefficient ntawm kev sib txhuam tawm tsam archwire.

Cov qauv thiab cov lus qhia tseem ceeb

Yuav kom ntseeg tau tias tus neeg mob muaj kev nyab xeeb thiab cov khoom siv tau zoo, 17-4 stainless hlau siv rau hauv kev kho hniav yuav tsum ua raws li cov qauv thoob ntiaj teb. Cov lus qhia tseem ceeb tshaj plaws yog ASTM F899, Cov Qauv Txheem rau Wrought Stainless Steels rau Cov Cuab Yeej Phais, uas qhia txog cov tshuaj lom neeg thiab cov kev cai kho mob rau qib kho mob 17-4.

Tsis tas li ntawd xwb, cov chaw tsim khoom feem ntau siv ASTM A564 rau cov kev cai dav dav ntawm cov hlau tsis xeb uas kub thiab txias uas ua kom tawv. Kev ua raws li cov qauv no lav tias cov khoom siv raw tsis muaj cov khoom tsis huv (xws li cov leej faj lossis phosphorus ntau dhau, txwv ntawm 0.030% thiab 0.040% feem) thiab muaj kev ncaj ncees microstructural tsim nyog kom dhau ISO 10993-5 (cytotoxicity) thiab ISO 10993-10 (sensitization) biocompatibility testing.

17-4 Stainless Steel vs Lwm Cov Khoom Siv

Thaum 17-4 stainless hlau dominates lublub pob kho hniavkev ua lag luam, nws feem ntau raug soj ntsuam nrog lwm cov ntaub ntawv xws li 316L stainless hlau, titanium ntshiab, cobalt-chromium (Co-Cr) alloys, thiab polycrystalline alumina (ceramic). Txhua yam khoom muaj nws tus kheej cov yam ntxwv ntawm cov khoom siv kho tshuab, cov yam ntxwv zoo nkauj, thiab cov nqi tsim khoom.

Kev xaiv cov khoom siv zoo tshaj plaws yuav tsum tau ua tib zoo sib npaug ntawm kev ua haujlwm zoo, kev nplij siab ntawm tus neeg mob, thiab kev siv nyiaj txiag. Kev sib piv ncaj qha qhia tau tias vim li cas 17-4 tseem yog qhov pib zoo tshaj plaws rau cov hlau zoo.

Cov qauv sib piv tseem ceeb

Thaum piv cov ntaub ntawv kho hniav, cov engineers thiab cov kws kho mob tsom mus rau lub zog ntawm cov hniav, qhov nyuaj, qhov sib txhuam coefficient, thiab biocompatibility. Lub zog ntawm cov hniav qhia txog kev tiv thaiv kev hloov pauv ntawm lub bracket, thaum qhov nyuaj cuam tshuam rau kev hnav thiab kev sib txhuam. Biocompatibility raug soj ntsuam raws li lub peev xwm ntawm cov khoom siv los ua rau muaj kev tsis haum tshuaj, feem ntau tsom mus rau kev tso tawm nickel.

Cov txiaj ntsig ntawm kev ua tau zoo

Piv rau 316L stainless hlau, 17-4 muaj zog dua peb npaug, ua rau cov bracket profiles me dua (mini-twins) yam tsis muaj kev cuam tshuam rau kev ruaj khov. Thaum piv rau titanium, 17-4 muaj zog dua, uas tiv thaiv cov teeb meem loj ntawm archwire binding thiab notching uas feem ntau cuam tshuam nrog cov titanium brackets softer.

Tsis tas li ntawd xwb, thaum cov brackets ceramic muab kev zoo nkauj zoo nkauj, lawv qhov kev tawg yooj yim ua rau muaj kev tawg ntawm cov hniav thiab cov txheej txheem debonding nyuaj uas tuaj yeem ua rau cov hniav puas tsuaj. 17-4 stainless hlau zam cov kev puas tsuaj loj heev no tag nrho, muab lwm txoj hauv kev uas yooj yim tab sis muaj zog heev uas lav qhov kwv yees tau hauv kev kho mob.

Cov kev sib pauv tseem ceeb

Qhov kev pauv pauv tseem ceeb uas cuam tshuam nrog 17-4 stainless hlau yog nws cov nickel. Txawm hais tias qis dua 316L (uas muaj 10-14% nickel), 3-5% nickel hauv 17-4 tseem tuaj yeem ua rau hypersensitivity rau cov neeg mob uas muaj kev pheej hmoo. Cov ntaub ntawv epidemiological qhia tias kwv yees li 10-15% ntawm cov pej xeem feem ntau muaj qee yam kev ua xua nickel.

Rau cov neeg mob tshwj xeeb no, cov kws kho hniav yuav tsum hloov cov brackets 17-4 nrog cov khoom siv uas tsis muaj nickel, xws li titanium ntshiab lossis ceramic brackets, txawm tias lawv muaj teeb meem kho vajtse. Tsis tas li ntawd, 17-4 brackets tsis muaj qhov pom tseeb ntawm cov aligners lossis cov khoom siv ceramic lingual, ua rau lawv zoo li cov cuab yeej biomechanical ib txwm muaj, ua haujlwm tau zoo dua li cov kev daws teeb meem zoo nkauj.

Kev Xav Txog Kev Tsim Khoom thiab Kev Tswj Xyuas Zoo

Cov qauv geometries ntawm cov orthodontic brackets niaj hnub no—uas muaj cov qauv sib xyaw, cov torque-in-base angulations uas meej, thiab cov undercuts rau ligation—ua rau kev siv tshuab rho tawm ib txwm tsis muaj txiaj ntsig zoo. Yog li ntawd, kev lag luam tau siv dav davKev Txhaj Tshuaj Hlau (MIM)ua tus txheej txheem tsim khoom txheem rau 17-4 stainless hlau brackets.

MIM muab kev ywj pheej ntawm kev txhaj tshuaj yas nrog rau kev ua kom zoo ntawm cov hlau wrought, tab sis nws xav tau cov txheej txheem tswj xyuas zoo kom ntseeg tau tias cov khoom kawg ua tau raws li cov qauv kho mob.

Cov txheej txheem tsim thiab kev kho cua sov

Cov txheej txheem MIM pib los ntawm kev sib tov cov hmoov hlau stainless hlau 17-4 zoo heev nrog cov thermoplastic binder los tsim cov khoom noj khoom haus. Cov khoom noj khoom haus no raug txhaj rau hauv cov pwm tshwj xeeb los tsim ib qho 'ib feem ntsuab' uas yog kwv yees li 15-20% loj dua li qhov kawg bracket. Tom qab ntawd cov binder raug tshem tawm los ntawm tshuaj lom neeg lossis thermally, tsim ib qho 'ib feem xim av', uas tom qab ntawd raug sintered hauv lub tshuab nqus tsev kub lossis lub tshuab cua sov hydrogen ntawm kwv yees li 1,300 ° C.

Thaum lub sijhawm sintering, lub bracket shrinks mus rau nws qhov kawg qhov ntev, ua tiav qhov ceev tshaj 97% ntawm cov khoom siv wrought (feem ntau >7.5 g / cm³). Tom qab sintering, cov brackets dhau los ua nag lossis daus hardening. Kev kho mob feem ntau rau orthodontics yog Condition H900, qhov twg cov khoom raug cua sov rau 482 ° C rau ib teev thiab cua txias, maximizing lawv lub zog thiab hardness rau kev siv kho mob.

Kev tshuaj xyuas, kev taug qab thiab kev ua raws li txoj cai

Vim tias qhov loj ntawm qhov bracket tswj cov hniav txav mus los ncaj qha, kev tshuaj xyuas qhov loj yog ib theem tseem ceeb ntawm kev tswj xyuas zoo. Cov chaw tsim khoom siv cov tshuab ntsuas qhov muag pom kev (CMMs) uas muaj peev xwm txheeb xyuas qhov dav thiab qhov tob ntawm qhov nrog qhov tseeb txog li 2 microns. Tus qauv kev lag luam xav tau qhov tsis zoo ntawm tsawg dua 0.1% (<1,000 PPM) rau qhov tsis ua haujlwm ntawm qhov loj ntawm qhov.

Kev taug qab tau raug yuam los ntawm cov cai lij choj txog cov khoom siv kho mob xws liISO 13485 thiab FDA 21 CFR Ntu 820Txhua pawg ntawm MIM 17-4 brackets yuav tsum taug qab mus rau qhov tshwj xeeb ntawm cov hmoov hlau nyoos. Cov ntaub ntawv ua raws li kev cai suav nrog cov ntawv qhia txog kev sim khoom siv (MTRs) uas lees paub cov tshuaj lom neeg sib xyaw, cov ntaub ntawv sintering cub tawg, thiab kev kuaj xyuas qhov ceev tom qab sintering, uas yuav tsum paub tseeb tias qhov ceev kawg ntau dua 7.5 g / cm³.

Cov kauj ruam kev tsim nyog ntawm tus neeg muab khoom

Rau cov OEM uas nrhiav tau 17-4 brackets los ntawm cov chaw tsim khoom cog lus, kev tsim nyog ntawm cov neeg muag khoom yog qhov tseem ceeb. Kauj ruam thawj zaug suav nrog kev tshuaj xyuas cov peev xwm MIM ntawm tus neeg muag khoom, tshwj xeeb tshaj yog tshuaj xyuas lawv cov cuab yeej ua haujlwm thiab kev tswj hwm lub cub tawg sintering, vim tias qhov kub hloov pauv ntawm 10 ° C thaum lub sijhawm sintering tuaj yeem ua rau muaj qhov tsis zoo.

Cov neeg yuav khoom kuj yuav tsum tau lees paub qhov peev xwm ua tiav tom qab tus neeg muag khoom. Qhov no suav nrog kev tshuaj xyuas lawv cov txheej txheem tumbling, electropolishing, thiab passivation kom ntseeg tau tias cov brackets ua tau raws li qhov xav tau Ra < 0.2 µm qhov chaw tiav. Thaum kawg, tus neeg muag khoom yuav tsum muab kev lees paub los ntawm tus neeg thib peb tias lawv cov khoom tiav 17-4 dhau ISO 10993-5 cytotoxicity thiab sensitization kev sim, lees paub tias cov khoom seem MIM tau raug tshem tawm tag nrho.

Cov Lus Qhia Txog Tus Nqi thiab Kev Xaiv

Kev yuav khoom siv hlau tsis xeb 17-4 zoo yuav tsum nkag siab txog cov nqi uas cuam tshuam rau cov txheej txheem MIM thiab tus nqi kho mob mus sij hawm ntev uas cov khoom siv muab. Txawm hais tias lwm cov ntaub ntawv yuav muab cov nqi khoom siv qis dua lossis cov txiaj ntsig zoo nkauj, 17-4 sawv cev rau qhov sib npaug zoo tshaj plaws ntawm kev tsim khoom, kev ruaj khov, thiab kev lag luam ntawm chav tsev.

Rau cov neeg faib khoom kho hniav, OEMs, thiab cov neeg yuav khoom hauv tsev kho mob, kev tshawb nrhiav cov khoom siv rau cov brackets no txhais tau tias kev soj ntsuam cov peev txheej cuab yeej ua ntej piv rau cov nyiaj txuag ntau ntawm kev tsim khoom.

Tus nqi piv rau tus nqi mus sij hawm ntev

Tus nqi khoom siv raw rau 17-4 MIM feedstock feem ntau yog li ntawm $ 15 txog $ 25 ib kilogram. Muab hais tias ib lub bracket orthodontic tsuas yog hnyav ib feem ntawm ib gram (feem ntau yog 0.1 txog 0.3 grams), tus nqi khoom siv raw rau ib chav tsev tsis tseem ceeb. Cov tsav tsheb nqi tiag tiag yog cov cuab yeej txhaj tshuaj molding, cov txheej txheem sintering siv zog ntau, thiab kev ua tiav tom qab ua tiav zoo rau kev kho mob tiav.

Txawm li cas los xij, tus nqi kho mob uas tsim los ntawm 17-4 brackets ntau dua li lawv cov nqi tsim khoom.

Cov Ntsiab Lus Tseem Ceeb

• Cov lus xaus tseem ceeb tshaj plaws thiab cov laj thawj rau Vim li cas 17-4 Stainless Steel yog qhov kev xaiv khoom zoo tshaj plaws rau Orthodontic Brackets?
• Cov lus qhia tshwj xeeb, kev ua raws li txoj cai, thiab kev kuaj xyuas kev pheej hmoo uas tsim nyog lees paub ua ntej koj cog lus
• Cov kauj ruam tom ntej thiab cov lus ceeb toom uas cov nyeem ntawv tuaj yeem siv tau tam sim ntawd

Cov Lus Nug Feem Ntau

Vim li cas cov hlau tsis xeb 17-4 thiaj li nyiam siv rau cov brackets orthodontic?

Nws muaj lub zog siab, kho tau kub, thiab tiv taus xeb, pab cov qhov bracket khaws lawv cov duab thiab xa cov hniav txav tau zoo dua.

Cov hlau tsis xeb 17-4 piv rau 304 lossis 316L li cas rau cov brackets?

17-4 tuaj yeem ua kom tawv thaum nag los, yog li nws muaj zog dua thiab tiv taus hnav ntau dua li cov hlau tsis xeb 300-series uas siv rau hauv cov ntawv thov qis dua.

Cov txiaj ntsig kho mob twg los ntawm kev ruaj khov ntawm qhov chaw zoo dua?

Qhov ntev ntawm qhov chaw ruaj khov txhim kho qhov kev qhia tawm ntawm lub zog, txo qhov kev hloov pauv nrog cov xov hlau plaub fab, thiab pab txo qhov kev ncua sij hawm uas tshwm sim los ntawm kev ua haujlwm tsis sib xws.

Puas yog 17-4 stainless hlau pab txo qhov tawg ntawm lub bracket?

Yog. Nws qhov kev khov kho thiab qhov tawv txo qhov kev pheej hmoo ntawm kev tawg thiab kev hnav ntawm cov hlua khi, uas tuaj yeem txo qhov kev mus ntsib kho dua tshiab thaum muaj xwm txheej ceev thaum kho mob.

Puas yog Denrotary muaj cov hlau stainless hlau 17-4 orthodontic brackets?

Yog. Denrotary muaj cov hlau tsis xeb MIM 17-4 thiab tsim cov khoom siv kho hniav raws li CE, FDA, thiab ISO13485 cov txheej txheem zoo.