Ntau tus phooj ywg 'miv thiab cov dev tsis tau tsa los ntawm ib tug hluas hnub nyoog, yog li lawv xav paub tias lawv muaj pes tsawg xyoo? Puas yog nws noj zaub mov rau cov kittens thiab menyuam dev? Los yog noj cov neeg laus dev thiab miv noj zaub mov? Txawm hais tias koj yuav ib tus tsiaj los ntawm ib tug menyuam hnub nyoog, koj tseem xav tias tus tsiaj muaj pes tsawg xyoo, puas yog 2 lub hlis lossis 3 hlis? Hauv tsev kho mob, peb ib txwm siv cov hniav los txiav txim siab txog cov tsiaj.

Cov hniav muaj qhov sib txawv tseem ceeb nyob ntawm cov zaub mov uas lawv noj thiab lawv cov kev noj zaub mov noj, nrog rau cov hniav sib tsoo cov khoom ua si thiab khoom noj txom ncauj. Yog li ntawd, feem ntau hais lus, lawv yog qhov tseeb rau cov menyuam dev thiab cov kittens, thaum rau cov neeg laus dev yuav tseem ceeb. Ntawm chav kawm, qhov thiaj li hu ua kev sib txawv kuj tseem muaj. Nws yog ib txwm muaj rau tus menyuam dev muaj hnub nyoog 5 xyoos los noj cov pob txha thiab muaj cov dev uas muaj 10 xyoo uas muaj tus dev uas muaj hnub nyoog 10-xyoo. Kuv ib zaug ntsib tus tswv tsiaj uas nqa tus tsiaj uas tau hais tias yuav muaj 17 xyoo. Nov yog qhov zoo tshaj plaws, thiab nws yog qhov tsim nyog los txiav txim siab nws lub hnub nyoog thiab lub cev rau kev kho. Qhib nws lub qhov ncauj kom pom nws cov hniav, nws tau kwv yees tias nws tsuas yog 7 xyoo. Kuv puas tau nco txog lub hnub nyoog ntawm nws niam tais yawm txiv tsis raug?

Ntawm chav kawm, saib cov hniav thaum me nyuam kuj tseem tuaj yeem qhia ntau cov kab mob ntawm cov tsiaj, xws li calcium tsis muaj peev xwm thiab kab sib ceg. Yog li nws yog ib qho tseem ceeb kom kawm paub kev txhim kho kev loj hlob ntawm cov hniav, txiav txim siab lawv lub hnub nyoog thiab kev noj qab haus huv.

Cov dev pib txhim kho cov hniav desiduous txij li 19 txog 20 hnub tom qab yug; Nyob rau ntawm 4-5 lub lis piam laus, thawj thiab lub mis loj thiab thib ob yog sib npaug ntev (Incisors); Nyob rau ntawm 5-6 lub lis piam ntawm lub hnub nyoog, tus hniav txiav thib peb yog qhov ntev ntev; Rau 8-lub lim tiam cov menyuam dev laus, txhua lub mis loj tuaj yeem cog txhua lub mis, thiab cov kaus hniav muaj kua mis yog xim dawb thiab ntse;

Thaum lub sijhawm 2-4 lub hlis tom qab yug me nyuam, cov dev hloov lawv cov hniav uas ua kom zoo, ua rau muaj kev sib tw tshiab los ntawm thawj qhov sib kis; Pib txij li hnub nyoog 5-6 lub hlis, hloov lub pob hluav taws xob thiab thib peb thiab canines; Thaum muaj hnub nyoog 8-12, txhua tus hniav puas hloov nrog cov hniav (cov hniav tas mus li). Cov hniav tas mus li yog dawb thiab ci, thiab cov incisors tau taw qhia cov protrusions. Yog tias daj zoo li, nws qhia Tartar;

Thaum ib tus dev yog 1.5 txog 2 xyoos, lub ncov loj ntawm thawj lub ntsej muag (cov hniav loj) hnav tawm thiab yaug nrog lub ncov me me, uas yog hu ua ncov ntov; Thaum muaj hnub nyoog ntawm 2.5, lub ncov ntawm lub nroog thib ob (hniav) yog hnav; Thaum muaj hnub nyoog ntawm 3.5, lub ncov ntawm cov incisrary maxillary hnav tawm; Thaum muaj hnub nyoog ntawm 4.5, lub ncov ntawm tus hniav nruab nrab hauv nruab nrab yog hnav; Lub xyoo tseem muaj cov dev los txog qhov kawg, thiab cov kev hloov pauv ntawm cov hniav thaum lawv noj, yog li lawv tau maj mam dhau los ua qhov tsis raug.

Pib txij li lub hnub nyoog ntawm 5, tus lej thib peb thiab canine qhia ntawm lub hauv qab qis dua yog hnav me me (tsis yog pluav me me), thiab thawj zaug hauv lub ntsej muag yog cov duab plaub; Thaum muaj hnub nyoog 6, lub ncov ntawm qhov thib peb maxillary incisor yog me me hniav, thiab canine hniav yog blunt thiab puag ncig; Thaum muaj hnub nyoog 7, cov pej xeem mandibular ntawm cov dev loj yog hnav mus rau lub hauv paus, nrog lub suab ntev elliptical nto; Thaum muaj hnub nyoog 8, tus dev loj mandibular mandibular tau hnav thiab qaij rau pem hauv ntej; Thaum muaj hnub nyoog 10, hnav lub teeb ntawm Mandibular thib ob thiab maxillary incisor yog ntev elliptical elliptical elliptical elliptical elliptical elliptical; Cov dev loj feem ntau muaj lub neej ntawm 10-12 xyoo thiab tsis tshua muaj kev paub hniav kev poob, feem ntau vim yog hnav thiab kua muag;

Thaum muaj hnub nyoog 16, tus dev me muaj lub neej ntev ntev, lossis theej tus qauv laus dev nrog cov hniav uas ploj lawm, thiab cov hniav tsis xwm yeem ntawm cov hniav tsis sib xws; Thaum muaj hnub nyoog 20, cov canine cov hniav poob tawm thiab muaj yuav luag tsis muaj hniav hauv qhov ncauj. Kev noj mov yog cov zaub mov ua kua xwb.

Piv rau cov dev feem ntau sib tsoo lawv cov hniav ntawm cov khoom tawv, uas ua rau nws nyuaj rau kev coj tus hniav, miv yuav luag siv raws li cov khoom muaj hnub nyoog zoo tshaj plaws rau kev txiav txim siab lub hnub nyoog.

Cov canine hniav ntawm miv yog qhov tseem ceeb, muaj zog thiab ntse, nrog lub hauv paus thiab ntsis. Thaum lub qhov ncauj kab ke raug kaw, sab qaum canine hniav yog nyob rau ntawm lub posterior sab nraud ntawm cov hniav qis dua. Muaj qhov sib txawv qab ntawm cov hniav kaus hniav tuaj yeem, uas yog lub anterior molar. Tus thawj tus kws tshaj lij yog qhov me me, qhov kev ua lag luam loj dua yog qhov loj dua, thiab tus thawj tshaj tawm tshiab yog qhov loj tshaj plaws. Ob qho tib si sab sauv thiab qis dua cov ntsiab lus muaj plaub tus hniav, nrog tus txhuam hniav nruab nrab tau loj dua thiab ntse, uas tuaj yeem kua muag. Yog li ntawd, nws tseem hu ua tus hniav cleft.