Tus nyuj muaj pes tsawg tus hniav: lub puab tsaig ntawm lub puab tsaig, kev loj hlob thiab kev hloov ntawm cov hniav

Cov txheej txheem:

Tus nyuj muaj pes tsawg tus hniav: lub puab tsaig ntawm lub puab tsaig, kev loj hlob thiab kev hloov ntawm cov hniav
Tus nyuj muaj pes tsawg tus hniav: lub puab tsaig ntawm lub puab tsaig, kev loj hlob thiab kev hloov ntawm cov hniav

Video: Tus nyuj muaj pes tsawg tus hniav: lub puab tsaig ntawm lub puab tsaig, kev loj hlob thiab kev hloov ntawm cov hniav

Video: Tus nyuj muaj pes tsawg tus hniav: lub puab tsaig ntawm lub puab tsaig, kev loj hlob thiab kev hloov ntawm cov hniav
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Anonim

Yuav kom nyuj tau tag nrho cov khoom tsim nyog los ntawm cov zaub mov, lawv yuav tsum zom zaub mov kom huv si, thiab qhov no yuav tsum muaj cov hniav muaj zog thiab noj qab nyob zoo. Thiab tus nyuj muaj pes tsawg tus hniav thiab lawv puas hloov? Raws li txoj cai, nws tau txiav txim siab tias tus nyuj muaj 32 cov hniav: 24 molars thiab 8 incisors nyob rau ntawm lub puab tsaig.

Cov qauv ntawm cov hniav ntawm ib tug nyuj
Cov qauv ntawm cov hniav ntawm ib tug nyuj

Hnub nyoog hloov

Cov hniav tsim pib hauv utero. Thaum yug los, thawj plaub tug hniav twb nyob rau hauv lub qhov ncauj ntawm cov hluas. Tom qab 1-2 lub lis piam, lawv loj hlob plaub hniav ntxiv. Thaum muaj hnub nyoog 4-6 lub hlis, thawj molars tshwm nyob rau hauv calf. Kev hloov pauv ntawm cov molars mus tas li tshwm sim thaum muaj hnub nyoog ob xyoos. Thiab tus nyuj muaj pes tsawg tus hniav thiab lawv qhov kev hloov pauv tau mob npaum li cas? Thaum lub sijhawm ua haujlwm, cov tsiaj hluas tsis muaj qhov tsis xis nyob, mob, vim lub sijhawm no txuas ntxiv mus.

Thaum muaj hnub nyoog 4-5 xyoos, txheej txheem ntawm kev sib tsoo nyuj cov hniav pib. Daim duab qhia tau hais tias muaj zog thiab loj npaum li cas nyob rau hauv tus tsiaj lub qhov ncauj kab noj hniav. Cov txheej txheem sib tsoo tshwm sim nyob rau hauv lub zog ntawm kev zom tas liquav nyab, nyom thiab lwm yam zaub mov. Thaum muaj hnub nyoog kaum xyoo, tus tsiaj muaj stumps peculiar.

Thaum muaj hnub nyoog 14-15 xyoos, cov hniav sab saud yuav luag tsis muaj nyob rau hauv ib tug nyuj - lawv hnav mus rau ib lub phaj. Nws tso cai rau koj zom nyom thiab lwm yam zaub mov cog.

Tus nyuj muaj pes tsawg tus hniav?
Tus nyuj muaj pes tsawg tus hniav?

qhov ncauj kab noj hniav

Lub qhov ncauj ntawm tus nyuj yog sawv cev los ntawm daim di ncauj, tus nplaig, sab plhu, pos hniav, palate, hniav, qog qaub ncaug, pharynx thiab tonsils. Thaum noj mov, zaub thiab lwm yam zaub mov nkag rau hauv qhov ncauj, qhov chaw zom zaub mov. Nta ntawm cov qauv ntawm cov hniav ntawm ib tug nyuj tso cai rau koj mus zom cov nyom. Cov zaub mov nws tus kheej raug ntes los ntawm tus nplaig thiab daim di ncauj.

Lub puab tsaig sab sauv yog dav dua lub puab tsaig qis, tso cai rau nyuj zom tau yooj yim ntawm ob sab. Tus nplaig ntawm nyuj yog tawv, nws ua haujlwm ntawm "tig" zaub mov hauv qhov ncauj.

Cov qauv ntawm lub puab tsaig

tus nyuj muaj pes tsawg tus hniav thiab lawv npaj li cas? Tsiaj txhu muaj 32 tus hniav. Lawv tsim ob arcades - hauv qab thiab saum toj no. Cov hniav ntawm sab xis thiab sab laug yog ib txwm sib luag. nyuj tsis muaj tus nas. Lub puab tsaig yog tsim los ntawm incisors, premolars, molars thiab pos hniav.

nyuj muaj cov hniav nram no:

  1. Incisors. Lawv lub hom phiaj yog txiav nyom. Hauv cov nyuj, lawv nyob ntawm lub puab tsaig sab hauv pem hauv ntej. Thawj khub ntawm incisors yog hooks. Qhov nruab nrab incisors nyob rau sab xis thiab sab laug. Hauv qab lawv yog cov npoo. Cov tsiaj zom zaub mov tsis muaj qhov incisors. Nyob rau hauv qhov chaw uas lawv yuav tsum tau, muaj ib tug ncoo los yog phaj,tsim los ntawm cov pos hniav thiab nruj nreem txuas rau periosteum ntawm cov hniav incisor. Vim tias cov qauv no, lub phaj yog nruj thiab ntom. Nws ua raws li grater.
  2. Nqa tsis muaj fangs, tab sis muaj cov npoo - cov no yog hloov kho fangs uas tau ua incisors.
  3. Molars, premolars. Lawv yog siv rau zom zaub mov. Hom hniav no tsis nyob tam sim ntawd tom qab lub incisors, tab sis tom qab tus hniav tsis muaj ntug tsim los ntawm cov pos hniav. Nyuj muaj peb khub ntawm premolars thiab molars ntawm txhua koov. Tag nrho muaj 24 cov hniav.

Qhov loj ntawm cov incisors tsis zoo ib yam. Qhov loj tshaj plaws yog thawj ob. Qhov tsawg tshaj plaws yog cov npoo. Cov incisors yog flattened nrog rounded npoo. Nyob rau hauv cov tsiaj hluas, lub crowns ntawm ib sab ntawm daim di ncauj overlap me ntsis.

Maj mam, nrog rau hnub nyoog, thaum lawv hnav, lawv coj lawv qhov chaw. Daim di ncauj qis pib sag me ntsis, lub puab tsaig qis kom protrude rau pem hauv ntej. Daim di ncauj sab sauv yog convex, me ntsis sab hauv. Lub puab tsaig yog txawb heev.

Tus naj npawb ntawm cov hniav hauv tus nyuj thaum muaj hnub nyoog yau thiab laus yog qhov sib txawv. Cov me nyuam loj hlob mis nyuj cov hniav. Lawv yog cov tsis yooj yim, nrog nyias enamel, uas yog sai sai erased. Thaum muaj hnub nyoog ib thiab ib nrab xyoo, tsis muaj enamel nyob rau hauv. Lub sijhawm no coincides nrog kev hloov ntawm cov hniav. Molars muaj qhov chaw muaj zog dua.

nyuj hniav yees duab
nyuj hniav yees duab

Tooth structure

Thaum xav paub ntau npaum li cas tus nyuj muaj cov hniav, tsis muaj coob tus neeg paub tias lawv muaj cov hniav tib yam li ib tug neeg, thiab cov qauv tsis txawv ntau. Lub hauv paus ntawm cov hniav yog dentin, zoo ib yam li cov pob txha, tab sis muaj zog ntau dua. Kwv yees li 70% ntawm cov ntaubyog minerals. Lub hauv paus yog calcium phosphate, uas yog vim li cas qhov tsis txaus ntawm cov khoom no yuav tsum tsis txhob tso cai. Txwv tsis pub, qhov tsis muaj cov ntsiab lus tsis zoo cuam tshuam rau lub xeev ntawm cov pob txha cov ntaub so ntswg, lub zog ntawm enamel, dentin. Cov organic ib feem ntawm dentin yog collagen.

Dentine npog nrog enamel. Nws yog cov ntaub so ntswg uas muaj zog tshaj plaws hauv lub cev. Nws raug kev nyuaj siab loj heev, raws li cov tsiaj niaj hnub zom ib yam dab tsi. Cov ntaub muaj calcium carbonate, calcium phosphate, thiab ntau cov ntsev. Ib feem, cov enamel siv cov kab hauv cov qaub ncaug, thiab lwm qhov los ntawm cov khoom noj.

Dhau li ntawm cov enamel, dentine yog tsim los ntawm cov cement. Lub hauv paus ntawm cov hniav nkag mus rau hauv alveolus, uas tsim cov periosteum - lub periodontium. Nws txuas nrog cementum, cov pos hniav nrog ntau hom kev sib txuas.

Ib feem ntawm cov hniav uas npog enamel hu ua crown. Nws tsim ib qho chaw ua haujlwm: hauv molars - zom, thiab hauv incisors - txiav. Lub pulp nyob rau hauv lub qhov ncauj yog mos mos.

Nyob rau sab saum toj ntawm cov hniav hauv paus hniav muaj ib lub qhov uas txuas nrog rau hauv kab noj hniav ntawm cov hniav, lub pulp. Cov nkoj thiab cov hlab ntsha xaus hla tus kwj dej.

Premolars, molars ntawm lub puab tsaig qis muaj ob lub hauv paus, thiab nyob rau sab saum toj - peb. Qhov chaw nqaim uas cov cag hla mus rau hauv lub kaus mom hu ua caj dab.

Cov qauv ntawm cov hniav ntawm ib tug nyuj
Cov qauv ntawm cov hniav ntawm ib tug nyuj

Kev txiav txim siab hnub nyoog

Paub seb tus nyuj muaj pes tsawg tus hniav, cov duab uas tau nthuav tawm hauv kab lus no, koj tuaj yeem txiav txim siab lub hnub nyoog ntawm tus tsiaj tau yooj yim. Nws qhov kev ntsuam xyuas yog ua los ntawm qhov mob ntawm cov hniav. Txij thaum muaj plaub xyoos, cov hniav pibzom, hloov ib tus tsos. Feem ntau, cov ntaub ntawv hauv qab no yog siv los txiav txim hnub nyoog:

  1. Year - enamel ntawm mis nyuj cov hniav hnav tawm ntawm sab hauv.
  2. Ob xyoos - hniav ntog.
  3. 2.5 xyoo - molars ntawm nruab nrab incisors pom.
  4. 4 xyoo - ntug loj hlob.
  5. 5 xyoo - txheej txheej saum toj kawg nkaus ntawm enamel raug tshem tawm. Gap tshwm.
  6. 6 xyoo - hloov kho incisors, cov duab ua dav dua.
  7. 7 xyoo - tsis muaj enamel ntawm nruab nrab incisors.
  8. 10 xyoo - tsis muaj enamel npoo, molars me me, square duab.
  9. 12 xyoos - cov ntiv taw sib npaug, tsis muaj enamel. Qhov khoob yog loj.

Txij hnub nyoog 12-13 xyoos, nws nyuaj rau kev txiav txim siab lub hnub nyoog ntawm tus nyuj, txij li cov hniav tau hnav hnyav heev, tsis muaj qhov seem hauv nruab nrab.

Tus nyuj muaj pes tsawg tus hniav
Tus nyuj muaj pes tsawg tus hniav

Zaj lus

Kev noj zaub mov kom raug yog qhov lav ntawm cov hniav noj qab haus huv thoob plaws lub neej ntawm tus tsiaj. Tsis txhob hnov qab tias txawm nyuj muaj cov kab mob ntawm cov hniav: hniav sib tsoo, hniav, hniav poob, kab mob hauv lub puab tsaig. Tag nrho cov no tuaj yeem zam tau yog tias koj pub mis nyuj zoo, saib xyuas nws txoj kev noj qab haus huv.

Pom zoo: