Video: Cov tshuaj txhuam hniav ntawm tus nas yog dab tsi?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Yog li, cov nas tus hniav mis yog: Kuv 1-1, C 0-0, P0-0, M 3-3. Tsiaj muaj 8 cov hniav ntawm lub puab tsaig qis thiab 8 rau saum, tag nrho ntawm kaum rau hniav Cov hniav muaj tib lub cev asbone.
Ua li no, cov tshuaj txhuam hniav yog dab tsi?
Nws tau sau raws li kev qhia ntawm tus naj npawb ntawm txhua hom ntawm hniav nyob rau ib sab ntawm lub puab tsaig sab saud ntawm tus lej cov hniav nyob rau ib sab ntawm lub puab tsaig qis. Cov tsiaj ntawv sib raug rau hom cov hniav (Kuv = Incisor, C = Canine, P = Premolar, M = Molar).
Ib qho ntxiv, vim li cas nas thiaj muaj cov hniav daj? Feem ntau, cov hlais sab sauv yog tsaus ntuj daj , yuav luag txiv kab ntxwv thiab hauv qab muaj sib zog daj xim. Qhov no yog vim qhov tseeb tias theenamel ntawm lawv cov hniav yog txiv kab ntxwv, as opposed to peb, uas yog dawb. Peb siv peb tus kheej cov hniav thaum noj mov thiab feem ntau yog nws. Ntawm qhov tod tes, tus tsiaj nas cov hniav yog tseem ceeb heev.
Ib sab saum toj no, pes tsawg tus hniav muaj nas?
Monophyodont Cov nas tsuag ntawm qhov tod tes, tsuas yog muaj ib of cov hniav lawv lub neej tag nrho. Lawv monophyodontal qhov ncauj pib qhia cov hniav thaum hluas li yim hnub ntawm hnub nyoog. Cov no cov hniav , kaum ob cov hniav , thiab plaub incisors tseem nyob hauv koj tus tsiaj cov rat lub qhov ncauj rau tas nws lub neej.
Cov tshuaj txhuam hniav ntawm miv yog dab tsi?
Cov cov qauv tshuaj ntawm miv yog: Miv : Cov hniav txiav: 2X (3/3 i, 1/1 c, 3/2 pm) = 26. Cov hniav tas mus li: 2X (3/3 I, 1/1 C, 3/2 PM, 1/1 M) = 30.
Pom zoo:
Koj puas tuaj yeem siv tshuaj txhuam hniav txhuam hniav ntawm qhov ncauj?
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