Lub odontogenesis ntawm thawj qhov kev kho hniav pib nyob rau hauv lub sij hawm embryonic, nruab nrab ntawm lub thib rau thiab xya lub lim tiam ntawm kev xeeb tub. Thawj theem ntawm kev txhim kho hniav yog pib, qhov twg ectoderm induces cov ntaub so ntswg mesenchymal thiaj li pib txheej txheem.
Yuav ua li cas thaum ntxov ntawm kev tsim hniav?
Hnub kev loj hlob feem ntau muab faib ua cov theem hauv qab no: pib theem, theem pob, theem cap, theem tswb, thiab thaum kawg maturation.
Dab tsi yog odontogenesis thiab txheej txheem tshwm sim li cas?
Dab tsi yog odontogenesis, thiab cov txheej txheem tshwm sim li cas? kev txhim kho hniav uas tshwm sim hauv theem thiab yog txheej txheem txuas ntxiv mus txog thaum ua tiav. Tsis muaj qhov tseeb txiav qhov pib lossis qhov kawg ntawm theem.
Cov hniav yog dab tsi?
Stage 2: (6 lub hlis) Thawj cov hniav uas tawg yog cov hniav sab sauv thiab sab hauv qab, cov hniav incisors. Theem 3: (10-14 lub hlis) Thawj Molars tawg. Theem 4: (16-22 lub hlis) Canine cov hniav (nruab nrab ntawm incisors thiab molars saum thiab hauv qab) yuav tawg. Kauj Ruam 5: (25-33 lub hlis) Cov molars loj tuaj.
Hnub nyoog twg yog cov hniav tsim tau?
Nruab nrab hnub nyoog txog 6 txog 7 xyoo, thawj cov hniav pib los thiab cov hniav mus tas li pib. Thaum muaj hnub nyoog li ntawm 21 xyoo, tus neeg nruab nrab muaj 32 cov hniav mus tas li - 16 ntawm lub puab tsaig sab sauv thiab 16 hauv qis.puab tsaig.
