Ntau tus phooj ywg cov miv thiab dev tsis tau tsa los ntawm cov hluas, yog li lawv xav paub tias lawv muaj hnub nyoog li cas?Puas yog noj zaub mov rau kittens thiab menyuam dev?Los yog noj cov neeg laus dev thiab miv zaub mov?Txawm tias koj yuav tus tsiaj thaum yau los, koj tseem xav tias tus tsiaj muaj hnub nyoog li cas, nws muaj 2 hli lossis 3 hli?Hauv tsev kho mob, peb feem ntau siv cov hniav los txiav txim siab txog hnub nyoog ntawm cov tsiaj.

Cov hniav muaj qhov sib txawv loj nyob ntawm cov khoom noj uas lawv noj thiab lawv cov cwj pwm 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 menyuam dev thiab miv, thaum rau cov dev laus, qhov sib txawv yuav yog qhov tseem ceeb.Ntawm chav kawm, lub thiaj li hu ua deviation kuj yog nruab nrab.Nws yog qhov tshwm sim rau tus dev 5 xyoos noj cov pob txha thiab cov hniav uas hnav thiab tsim kua muag tib yam li tus dev 10 xyoo, tab sis koj tsis tuaj yeem ntsib tus dev 10 xyoo nrog cov hniav uas zoo ib yam li dev. ib tug 5 xyoos.Kuv ib zaug ntsib ib tug tswv tsiaj uas coj ib tug tsiaj plaub hau daj uas hais tias muaj 17 xyoo.Qhov ntawd yog ib qho zoo heev, thiab nws yog qhov tsim nyog los txiav txim siab nws lub hnub nyoog thiab lub cev mob rau kev kho mob.Qhib nws lub qhov ncauj kom pom nws cov hniav, kwv yees tias nws muaj 7 xyoo xwb.Kuv puas nco qab lub hnub nyoog ntawm nws pog thiab yawg?

Tau kawg, kev soj ntsuam cov hniav thaum menyuam yaus tuaj yeem pom ntau yam kab mob ntawm cov tsiaj, xws li calcium deficiency thiab ob kab kab hniav.Yog li nws yog ib qho tseem ceeb uas yuav tsum paub yuav ua li cas saib xyuas kev loj hlob ntawm cov hniav, txiav txim siab lawv lub hnub nyoog thiab kev noj qab haus huv.

Cov dev pib tsim cov hniav deciduous los ntawm 19 mus rau 20 hnub tom qab yug me nyuam;Thaum muaj hnub nyoog 4-5 lub lis piam, thawj thiab thib ob lub mis incisors yog sib npaug ntev (incisors);Thaum muaj hnub nyoog 5-6 lub lis piam, qhov thib peb txiav hniav yog sib npaug ntev;Rau cov menyuam dev 8 lub lis piam, tag nrho cov mis incisors loj hlob tuaj, thiab cov hniav ntawm lub mis yog dawb thiab nyias thiab ntse;

Thaum lub sij hawm 2-4 lub hlis tom qab yug me nyuam, dev maj mam hloov lawv cov hniav deciduous, shedding thiab loj hlob tshiab incisors los ntawm thawj incisor;Pib los ntawm lub hnub nyoog ntawm 5-6 lub hlis, hloov qhov thib ob thiab thib peb incisors thiab canines;Thaum muaj hnub nyoog 8-12 lub hlis, tag nrho cov molars raug hloov nrog cov hniav mus tas li (cov hniav tas mus li).Cov hniav mus tas li yog dawb thiab ci, thiab cov incisors tau taw qhia protrusions.Yog tias daj tshwm, nws qhia tias tartar;

Thaum tus dev muaj hnub nyoog 1.5 mus rau 2 xyoos, lub ncov loj ntawm thawj mandibular incisor (pem hauv ntej hniav) hnav tawm thiab yaug nrog lub ncov me me, uas yog hu ua ncov hnav tawm;Thaum muaj hnub nyoog 2.5, lub ncov ntawm qhov thib ob mandibular incisor (nruab nrab hniav) yog hnav;Thaum lub hnub nyoog ntawm 3.5, lub ncov ntawm maxillary incisors yog hnav tawm;Thaum muaj hnub nyoog 4.5, lub ncov ntawm nruab nrab maxillary hniav yog hnav tawm;Cov tub ntxhais hluas xyoo ntawm cov dev tuaj txog qhov kawg, thiab cov kev hloov ntawm cov hniav nyob rau lub sijhawm no tsis cuam tshuam los ntawm cov hnub nyoog li cov khoom noj uas lawv noj, yog li lawv maj mam ua tsis raug.

Pib txij thaum muaj hnub nyoog 5 xyoos, qhov thib peb incisor thiab canine taub ntawm lub hauv pliaj qis yog me ntsis hnav (tsis flattened), thiab thawj thiab thib ob incisors yog duab plaub;Thaum muaj hnub nyoog 6 xyoo, lub ncov ntawm qhov thib peb maxillary incisor yog me ntsis hnav, thiab cov hniav canine yog blunt thiab round;Thaum muaj hnub nyoog 7 xyoo, mandibular incisors ntawm cov dev loj yog hnav mus rau hauv paus, nrog ib tug longitudinal elliptical nto;Thaum muaj hnub nyoog 8 xyoo, tus dev loj lub mandibular incisors yog hnav thiab tilted rau pem hauv ntej;Thaum muaj hnub nyoog 10 xyoo, hnav nto ntawm mandibular thib ob incisor thiab maxillary incisor yog longitudinally elliptical;Cov dev loj feem ntau muaj lub neej ntev ntawm 10-12 xyoo thiab tsis tshua muaj kev poob hniav, feem ntau yog vim hnyav hnyav;

Thaum muaj hnub nyoog 16 xyoos, tus dev me muaj lub neej ntev, lossis zoo li tus dev laus uas muaj cov kab mob uas ploj lawm, cov hniav tsis tiav, thiab cov hniav tsis sib xws feem ntau;Thaum muaj hnub nyoog 20 xyoo, cov hniav tuaj yeem poob thiab yuav luag tsis muaj cov hniav hauv qhov ncauj.Noj zaub mov mas yog kua.

Piv nrog rau cov dev feem ntau sib tsoo lawv cov hniav ntawm cov khoom tawv, uas ua rau nws nyuaj rau kev txiav txim siab hnub nyoog vim cov hniav hnav, miv cov hniav loj hlob tsis tu ncua thiab yuav luag siv los ua qhov zoo tshaj plaws rau kev txiav txim siab hnub nyoog.

Lub canine hniav ntawm miv yog qhov ntev, muaj zog thiab ntse, nrog rau hauv paus thiab taub.Thaum lub qhov ncauj kaw, cov hniav ntawm cov hniav yog nyob rau ntawm lub posterior sab nrauv ntawm cov hniav hauv qab.Muaj qhov sib txawv hauv qab ntawm cov hniav canine, uas yog cov molar anterior.Thawj premolar yog qhov me me, qhov thib ob premolar loj dua, thiab qhov thib peb premolar yog qhov loj tshaj.Ob qho tib si sab sauv thiab sab qis muaj plaub lub tswv yim, nrog rau cov hniav nruab nrab ntawm qhov loj thiab ntse, uas tuaj yeem tsim kua muag.Yog li ntawd, nws tseem hu ua tus hniav cleft.