2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Fluoride pab rov tsim kho thiab ntxiv dag zog rau cov hniav, los yog enamel. Dej fluoridation tiv thaiv cov hniav lwj los ntawm kev sib cuag nrog cov tshuaj fluoride qis. Los ntawm kev ua kom cov hniav muaj zog thiab ruaj khov, fluoride nres cov kab noj hniav los ntawm kev tsim thiab tuaj yeem tsim kho cov hniav ntawm qhov chaw.
Thaum twg Tebchaws Meskas pib cov tshuaj fluoridating?
Thaum twg dej fluoridation pib hauv Tebchaws Meskas? Hauv 1945, Grand Rapids, Michigan, kho cov fluoride cov ntsiab lus ntawm nws cov dej mus rau 1.0 ppm thiab yog li tau dhau los ua thawj lub nroog los siv cov dej fluoridation hauv zej zog.
Lub hom phiaj ntawm fluoride yog dab tsi?
Fluoride feem ntau hu ua qhov kab noj hniav fighter thiab yog vim li cas. Fluoride, ib txwm muaj cov ntxhia, pab tiv thaiv kab noj hniav hauv cov menyuam yaus thiab cov neeg lauslos ntawm kev ua rau cov hniav sab nrauv (enamel) tiv taus cov kua qaub uas ua rau cov hniav lwj.
Peb yuav ua li cas dej fluoride?
Cov tshuaj fluoride ntau tshaj plaws siv hauv NSW yog sodium silicofluoride rau cov khoom siv dej loj, thiab sodium fluoride rau cov khoom siv dej me me. Rau lub chaw kho dej hauv NSW tam sim no siv hydrofluosilicic acid.
3 qhov chaw ntawm fluoride yog dab tsi?
av, dej, nroj tsuag, thiab zaub mov muaj cov tshuaj fluoride. Feem ntau ntawm cov tshuaj fluoride uas tib neeg haus yog los ntawm cov dej fluoridated, khoom noj thiab dej haus uas tau npaj nrog dej fluoridated, thiab tshuaj txhuam hniav.thiab lwm yam khoom siv kho hniav uas muaj fluoride [2, 3].
Pom zoo:
Vim li cas fluoride thiaj ntxiv rau cov tshuaj txhuam hniav?
Fluoride yog ib qho ntxhia tshwm sim hauv dej hauv ntau qhov sib txawv, nyob ntawm seb koj nyob qhov twg hauv UK. Nws tuaj yeem pab tiv thaiv cov hniav lwj, yog vim li cas nws thiaj ntxiv rau ntau hom tshuaj txhuam hniav thiab, hauv qee thaj chaw, rau cov dej xau los ntawm cov txheej txheem hu ua fluoridation.
Vim li cas dej thiaj tawm hauv kuv lub kav dej?
Thaum cov kav dej ntws ntws los yog khiav nrog dej, ib qho ntawm cov laj thawj feem ntau yog teeb meem nrog lub valve ntab. Float valves muaj nyob rau hauv chav dej tso dej, tso dej txias thiab cov cua sov hauv nruab nrab thiab cov tank nthuav dav.
Peb puas yuav cia siab tias peb yuav tau txais kev txhawb nqa thib peb?
Teb: Ntau lab tus neeg Asmeskas twb tau txais lawv qhov kev ntsuas thib peb. Thiab IRS yuav xa tawm ntau dua ob peb lub lis piam tom ntej. Yog li, yog tias koj tseem tsis tau txais koj cov nyiaj them poob haujlwm (piv txwv tias koj tsim nyog tau txais kev them nyiaj), nws yuav tsum tuaj sai sai.
Vim li cas peb thiaj xav tau daim ntawv ntsuam xyuas dej?
By mapping tawm dej qhov tob, cov duab ntawm ntug hiav txwv dej thiab ntug hiav txwv dej, qhov chaw muaj kev cuam tshuam thiab cov yam ntxwv ntawm lub cev dej, hydrography pab ua kom peb cov kev thauj mus los hauv hiav txwv txav mus los. nyab xeeb thiab ua tau zoo.
Vim li cas peb thiaj hais tias yog dej nyab?
Lo lus hogges ntxuav thawj zaug tshwm sim hauv 1400s hauv nws qhov kev nkag siab, lub ntsiab lus swill rau tus npua. Los ntawm xyoo 1600s hog ntxuav tau siv nyob rau hauv ib qho kev tsis raws cai los txhais tau hais tias haus cawv uas tsis muaj cawv txaus rau cov neeg haus cawv.
