Cov tshuaj kho hniav ntawm cov dev

 Feem ntau, txhua tus dev muaj 42 molars, tab sis qee cov tsiaj nrog luv muzzles, hu ua brachycephals, tej zaum yuav muaj cov hniav ploj (oligodontia). Kuj tseem muaj qhov tsis zoo li cov hniav ntau ntxiv (polydontia). Ib qho alphanumeric designation yog siv los sau cov qauv kho hniav ntawm cov dev.

• Incisors (Incisivi) - ib
• Caninus — P
• Premolyar (Premolars) — P
• Molares (Molares) – M

Nyob rau hauv daim ntawv sau npe, cov qauv kev kho hniav ntawm cov dev zoo li no: lub puab tsaig sab sauv 2M 4P 1C 3I 3I 1C 4P 2M - 20 cov hniav qis lub puab tsaig 3M 4P 1C 3I 3I 1C 4P 3M - 22 cov hniav, thiab tsab ntawv qhia txog cov hniav Lub puab tsaig sab sauv M2, M1, P4, P3, P2, P1, I3, I2 I1, I1 I2 I3, C, P1, P2, P3, P4, M1, M2 lub puab tsaig M3, M2, M1, P4, P3, P2 , P1, I3, I2, I1, I1, I2, I3, C, P1, P2, P3, P4, M1, M2, M3

Yog tias koj piav qhia hauv cov ntsiab lus yooj yim, tom qab ntawd hauv lub puab tsaig sab sauv ntawm tus dev muaj 6 incisors, 2 canines, 8 premolars, 4 molars, hauv qab puab tsaig - 6 incisors, 2 canines, 8 premolars, 6 molars.

 Txawm li cas los xij, cov qauv kev kho hniav ntawm cov mis nyuj cov hniav ntawm cov dev zoo li txawv, vim. P1 premolar yog cov hauv paus txawm thiab tsis muaj deciduous antecedent. Tsis tas li ntawd, M molars tsis muaj mis nyuj. Yog li ntawd, yog tias koj sau cov qauv ntawm cov hniav ntawm cov mis nyuj, nws zoo li qhov no: Cov qauv kev kho hniav ntawm cov dev ua ntej hloov cov hniav yog raws li nram no: lub puab tsaig sab sauv: 3P 1C 3I 3I 1C 3P - 14 cov hniav hauv qab puab tsaig: 3P 1C 3I 3I 1C 3P - 14 cov hniav los yog lub puab tsaig sab sauv: P4, P3, P2, C, I3, I2, I1 I1, I2, I3, C, P2, P3, P4 lub puab tsaig sab: P4, P3, P2, I3, I2, I1 I1 , I2, I3, C, P2, P3, P4  

Hloov cov hniav hauv cov dev

Kev hloov ntawm cov hniav hauv dev tshwm sim nyob rau nruab nrab ntawm lub hnub nyoog ntawm 4 lub hlis. Thiab nws tshwm sim hauv qhov kev txiav txim hauv qab no: 

 Nco tseg: Premolars thiab molars tsis muaj deciduous antecedents loj hlob thiab nyob mus ib txhis. Nws yog ib nqi sau cia hais tias ib co breeds ntawm dev muaj nta. Piv txwv li, lub premolar tsis loj hlob. Los yog cov molars loj hlob thaum hloov cov hniav, tab sis cov mis nyuj tsis poob. Nyob rau hauv cov ntaub ntawv no, nws yog tsim nyog hu rau ib tug kws kho hniav thiab resorting mus tshem tawm cov mis nyuj cov hniav. Polydontia thiab oligodontia tuaj yeem qhia txog kev tsis sib xws ntawm caj ces, kev noj zaub mov tsis zoo lossis cov kab mob yav dhau los (rickets, tsis muaj calcium), vim tias yuav luag txhua tus dev muaj 6 * 6 incisor mis ntawm qib caj ces. Kuj tseem ceeb heev. Feem ntau cov yug me nyuam yuav tsum muaj txiab tom, tab sis muaj cov yug me nyuam qhov twg undershot tom yog ib txwm (brachycephalic).

Kev kho hniav mis ntawm dev: lub hom phiaj ntawm txhua hom hniav

Tam sim no cia peb tham ntxiv txog lub hom phiaj ntawm txhua hom hniav. cutters - Tsim los tom cov nqaij me me. fangs - yog tsim los rhuav tshem cov nqaij loj, thiab lawv txoj haujlwm tseem ceeb yog kev tiv thaiv. Molars thiab premolars - tsim los zom thiab zom cov zaub mov fibers. Nws yog ib nqi sau cia hais tias cov hniav noj qab haus huv yuav tsum dawb tsis muaj plaque thiab darkening. Raws li cov dev muaj hnub nyoog, cov hniav hnav tau txais. Nws tuaj yeem siv los txiav txim siab txog hnub nyoog ntawm tus dev.