Muaj nuj nqi thiab cov qauv ntawm tib neeg hniav

Ib tug hniav yog ib tug pob txha tsim, uas yog cia nyob rau hauv lub alveoli ntawm lub sab sauv thiab sab puab tsaig. Lub ntsiab muaj nuj nqi ntawm lub puab tsaig yog chopping zaub mov, kev kawm ntawv coherent hais lus thiab kev koom tes nyob rau hauv tus txheej txheem ntawm respiration.
Muaj ntau ntau pab pawg ntawm cov koom haum, txhua tus uas muaj ib tug neeg hniav qauv. Piv txwv li, lub cutter 4 positioned nyob rau hauv lub foreground ntawm lub puab tsaig, npaj rau lawv cov khoom noj seem nibbles. Nyob rau ntawm ob sab ntawm lub incisors yog canines, uas yog faib ib tug tshwj xeeb daim ntawv no. Lawv lub ntsiab muaj nuj nqi yog tearing cov zaub mov mus rau hauv daim me me. Loj thiab me me hniav puas muab kev koom tes nyob rau hauv tus txheej txheem ntawm sib tsoo thiab muaj txhij txhua dua sib tsoo. Lub deb hniav uas yuav tshwm sim mus rau 20 xyoo, hu ua txoj kev txawj ntse hniav.
Tag nrho cov hniav qauv yog hais tias muaj yog dentin thiab cov tub ntxhais. Cov tub ntxhais ntawm tus hniav yog tsim los ntawm cov paj txoj thiab cov hlab ntsha, thiab cov dentin ntawm tus hniav yas yog coated nrog ib tug khoom enamel. Kev Kho Hniav yas muaj ob peb chaw, txij li thaum cov tub ntxhais yog ncig rau tag nrho plaub sab. Sheer txha hniav laus yog lub hardest tshuaj nyob rau hauv tag nrho tib neeg lub cev, txij li thaum nws muaj calcium.
puab tsaig qauv muaj ib tug xov tooj ntawm cov hniav (ntawm kom loj hlob yog 32) tsau nyob rau hauv lub Upper thiab qis puab tsaig pob txha. Ntawm ob qhov chaw muaj kev cob cog puab tsaig temporo-mandibular pob qij txha, vim uas tej zaum nws yuav tsum qhib thiab kaw lub qhov ncauj. yooj yim clicks, uas tsis yog ib tug loj sib txawv yeej yuav hnov thaum cia li taw.
Yuav tsum faib deciduous thiab lawm cov hniav, vim hais tias txhua pab pawg neeg muaj nws tus kheej muaj nuj nqi. Mis hniav tshwm sim nyob rau hauv thawj xyoo ntawm lub neej, lawv maj mam poob tawm thiab yog hloov los ntawm tas mus li loj hlob. Tus qauv ntawm cov thawj cov hniav txais kev noj mov zaub mov uas tus me nyuam twg thiaj li raug siv maj. Tsis tas li ntawd, tus me nyuam cov hniav yog ib qhov tseem ceeb rau tej kev tsim ntawm lub puab tsaig txha thiab tus neeg raws li ib tug tag nrho. Feem ntau, 1.5-2 xyoo ntawm tus me nyuam yuav tsum tau 20 mis nyuj cov hniav. Tshwj xeeb tshaj yog cov tshwm sim ntawm cov thawj thiab tom ntej uas tsis yog-ruaj khov hniav yog ib tug mob, thiab o ntawm cov pos hniav. Heev feem ntau, tus me nyuam yuav ntau chim siab thiab chim, nws lub cev kub ntawm lub nce, muaj yog raws plab.
Cob phum qauv ntawm tus hniav yog tsim nyob rau hauv 6-7 lub xyoo. Cov kab kiag li tib yam li nyob rau hauv lub tawg ntawm thawj cov hniav. Kawg hloov tshwm sim kwv yees li 12-13 xyoo, tsis xws li cov hniav txhab, uas loj hlob npaum li cas tom qab ntawd. Heev feem ntau, cov hniav txhab hlob painfully thiab maj mam pib mus ua txhaum down. Kom tsis txhob muaj kev puas tsuaj theem hniav qauv, nws yog pom zoo kom tshem tawm cov lawv mus rau ib qho mob hniav yog tsis tau ua txhaum uas nyob ib sab qauv.
Ntawm cov hoob kawm, tus hniav qauv yuav tsum tau khaws cia thoob plaws lub neej. Insufficiently competent qhov ncauj noj qab haus huv mob thiab cov tsis muaj kev tiv thaiv yuav ua tau kom loj pos hniav mob thiab hniav lwj. Nws yuav tsum tau nco ntsoov hais tias hais tias muaj ntau ntawm cov khoom uas muaj ib tug tsis zoo feem nyob rau lub zwj thiab noj qab haus huv ntawm koj cov hniav, li ntawd tom qab txhua txhua pluas noj koj yuav tsum ntxuav lub qhov ncauj los ntawm khoom noj khoom haus residue. Qhov zoo tshaj plaws kev xaiv no yog kev tu nrog ib tug txhuam thiab muab tshuaj txhuam, tab sis qhov no yog tsis ib txwm muaj nyob rau hauv lub niaj hnub kwj ntawm lub neej. Thaum lub caij, muaj ntau txoj kev kom muaj qhov ncauj huv thoob plaws hauv lub hnub (zom cov pos hniav, xov, toothpicks, etc.).

Hniav tu txheej txheem yog ib tug nyias muaj nyias ib seem nyob rau hauv kev kho hniav txij li thaum muaj ib tug zoo cov txheej txheem thiab tus kav dentifrice. Thaum twg irregularities thiab hloov hu mus nrhiav kev pab los ntawm ib tug tshwj xeeb uas tshuaj xyuas thiab muab kev tsim nyog kho mob los yog kev tiv thaiv ntawm cov kab mob tuav.