Cov txheej txheem:
Video: Cov hniav muaj pes tsawg txheej?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov Hniav Muaj Cov Txheej
Txhua tus hniav muaj peb txheej : txha hniav laus, dentin, thiab sis plawv hniav. Cov enamel yog txheej txheej sab nraud thiab feem ntau yog ua los ntawm calcium phosphate minerals. Enamel yog cov khoom hnyav tshaj plaws hauv tib neeg lub cev, tab sis nws tsis loj hlob rov qab thaum nws ploj lawm.
Cov lus nug tseem yog, peb txheej txheej ntawm cov hniav yog dab tsi?
Koj Cov Hniav yog tsim los ntawm peb Cov Txheej Txheem Dental Anatomy 101
- LUB ENAMEL. Cov hniav txha hniav laus yog qhov pom, txheej txheej ntawm cov hniav.
- LUB DENTIN. Lub dentin yog txheej thib ob lossis nruab nrab ntawm cov hniav, txheej ncaj qha rau hauv qab cov enamel.
- LUB PULP. Lub pulp yog txheej nruab nrab ntawm cov hniav.
cov hniav nyob hauv lub qhov ncauj li cas? Tus hniav 1 yog hniav farthest rov qab rau sab xis ntawm lub qhov ncauj hauv lub puab tsaig sab saud (maxillary). Tus lej txuas ntxiv mus rau sab sauv cov hniav mus rau pem hauv ntej thiab hla mus rau hniav nyob deb tshaj plaws nyob rau sab laug sab saum toj tus lej 16. Cov cov zauv txuas ntxiv los ntawm kev poob qis mus rau qis (mandibular) lub puab tsaig.
Ntawm no, cov khaubncaws sab nraud povtseg ntawm cov hniav yog rhiab thiab qhov twg tsis yog?
Txha hniav laus Lub tawv txheej txheej ntawm lub yas . Enamel yog qhov nyuaj tshaj plaws nyob hauv lub cev . Dentine Tsis nyuaj npaum li txha hniav laus , cov ntaub ntawv feem ntau ntawm cov hniav thiab tuaj yeem nkag siab yog tias kev tiv thaiv ntawm cov enamel ploj lawm. Pulp Cov ntaub so ntswg uas muaj cov ntshav thiab cov hlab ntsha muab rau cov hniav.
Koj yuav tsum zom pes tsawg tus hniav?
Raws li ib tug me nyuam, koj muaj 20 cov hniav , thiab raws li ib tug neeg laus koj yuav tsum muaj 32 cov hniav . Ntawm 32 cov hniav , txhua tus muaj nws tus kheej txoj haujlwm hauv zom thiab noj cov txheej txheem. Ua tib zoo saib xyuas koj cov hniav thiab ua kom koj cov pos hniav noj qab nyob zoo kom tsis txhob muaj kab noj hniav thiab lwm yam teeb meem kev noj qab haus huv tag nrho.
Pom zoo:
Muaj pes tsawg teev ntawm cov plaub muag uas cov ntxhuav muaj?
Cov ntxhuav tuaj yeem kaw lawv lub qhov ntswg kom tsis txhob xuab zeb.Lawv tseem muaj ob lub qhov muag plaub muag los tiv thaiv lawv - ib qho luv dua (cov uas nyob ze rau ntawm lub qhov muag) thiab ntev dua. Cov ntxhuav tau nrawm
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Tus txheej txheem txheej txheej txheej thaum ub zoo li cas?
Kev tsim cov txheej txheem thaum ntxov hauv lub blastocyst suav nrog kev sib koom ua ke ntawm kev sib koom tes thiab rov kho cov hlwb hauv epiblast. Cells overlaying Koller Sickle nyob rau tom qab kawg ntawm tus me nyuam qaib embryo txav mus rau kab nruab nrab, sib ntsib thiab hloov kev taw qhia mus rau nruab nrab ntawm epiblast
Muaj pes tsawg tus kab mob muaj cov keyboard muaj?
(1) Lub khoos phis tawj keyboard feem ntau tuaj yeem muaj 7,500 tus kab mob ib zaug. Daim duab rau lub mloog pob ntseg yog 2,550 thiab rau hauv qab ntawm lub hnab tes nws yog 2,520