Cov txheej txheem:
Video: Cov haujlwm ntawm cov hniav yog dab tsi?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov hniav pab ib tus neeg siv lawv lub qhov ncauj kom noj, hais lus, luag nyav, thiab muab lub ntsej muag zoo rau lawv lub ntsej muag. Txhua hom hniav muaj lub npe thiab qhov tshwj xeeb muaj nuj nqi . Cov hniav yog tsim los ntawm ntau txheej - enamel, dentin, pulp, thiab cementum. Enamel, uas yog cov khoom hnyav tshaj plaws hauv lub cev, yog nyob rau sab nraud ntawm cov hniav.
Hais txog qhov no, dab tsi yog 4 hom hniav thiab lawv txoj haujlwm?
Hom Hniav thiab Lawv Txoj Haujlwm
- Incisors - Plaub lub hauv ntej cov hniav hauv ob lub puab tsaig sab saud thiab qis hu ua incisors.
- Canines - Muaj plaub canines nyob rau hauv lub qhov ncauj kab noj hniav.
- Premolars (Bicuspids) - Cov hniav no nyob tom qab thiab nyob ib sab ntawm cov hmuv thiab tau tsim los zom cov zaub mov.
- Molars - Cov hniav tom qab tshaj plaws hauv lub qhov ncauj yog cov molars.
Ib yam li ntawd, cov haujlwm ntawm koj cov hniav thiab cov pos hniav yog dab tsi? Gingivae (cov pos hniav): Cov ntaub so ntswg uas tam sim ntawd ncig cov hniav thiab pob txha. Nws tiv thaiv cov pob txha thiab cov keeb kwm ntawm cov hniav thiab muab qhov yooj yim lubricated nto. Pob txha: Muab lub qhov (socket) puag ncig thiab txhawb nqa keeb kwm ntawm cov hniav.
dab tsi yog lub luag haujlwm tseem ceeb ntawm cov hniav?
Lawv muaj nuj nqi yog tuav thiab rhuav cov zaub mov. Muaj plaub canine cov hniav hauv ob qho tib si thawj thiab dentitions mus tas li. Cov premolars, tsis zoo li cov incisors thiab canines, muaj ib tug tiaj tus tom. Lawv muaj nuj nqi yog kom rhuav thiab zuaj cov zaub mov.
Cov hniav hu li cas?
Incisors - lub ntse ntse, chisel-puab pem hauv ntej cov hniav (plaub sab saud, plaub sab qis) siv rau kev txiav zaub mov. Canines - qee zaum hu ua cuspids, cov cov hniav yog zoo li cov ntsiab lus (cusps) thiab yog siv los rhuav cov zaub mov. Premolars - cov no cov hniav muaj ob lub cusps taw ntawm lawv qhov chaw tom thiab qee zaum hu ua bicuspids.
Pom zoo:
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