Vim li cas cov yaj tsuas muaj cov hniav nyob rau hauv qab lub puab tsaig? Teb: Lawv ua, tab sis tsis nyob rau pem hauv ntej. Lawv muaj ib lub phaj nyob rau pem hauv ntej ntawm lawv lub qhov ncauj uas ua zoo li serrated txiab los pab lawv lob nyom, thaum tom qab lawv muaj tsib mus rau rau kab ntawm cov hniav los pab lawv zom lawv cov zaub mov.
yaj puas muaj hniav?
Cov hniav ntawm yaj tau muab faib ua ob ntu, uas yog, yim qhov chaw nyob ruaj khov nyob rau hauv lub puab tsaig sab hauv qab thiab nees nkaum plaub molars, tom kawg tau muab faib ua rau ntawm txhua sab ntawm lub puab tsaig sab sauv thiab sab qis. Yaj tsis muaj hniav nyob rau hauv pem hauv ntej ntawm lub puab tsaig sab sauvuas muaj cov ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom.
Vim li cas yaj thiaj tsis muaj hniav?
Thaum yug los, menyuam yaj muaj yim tus menyuam (lossis mis nyuj) cov hniav lossis ib ntus incisors teem rau ntawm lawv lub puab tsaig. Lawv tsis muaj cov hniav ntawm lawv lub puab tsaig sab saum toj, tsuas yog cov ntaub qhwv hniav xwb. … Ib tug yaj uas tsis muaj cov hniav tuaj yeem tseem muaj sia nyob vim nws siv nws cov molars feem ntau rau zom zaub mov.
yaj muaj pes tsawg tus hniav?
YYaj muaj
32 cov hniav tas mus li nrog cov qauv kho hniav ntawm 2 (incisors 0/4, premolars 3/3, thiab molars 3/3). Cov hniav ib ntus incisor erupted sequentially ntawm kwv yees li ib lub lim tiam ntawm yug los. Peb qhov premolars ib ntus tawg hauv ob mus rau rau lub lis piam.
Txhua tus tshis tsuas muaj cov hniav hauv qab xwb?
Ib tug tshis cov hniav tuaj yeem loj hlob thiab poob thaum muaj hnub nyoog sib txawv me ntsis dua li cov hniav ntawm ib qho twglwm tshis. Tsis muaj cov hniav pem hauv ntej nyob rau hauv tshis lub qhov ncauj, es tsis txhob koj tus doe muaj ib tug tawv toothless "dental pad". Koj tshis muaj cov hniav nyob rau sab saum toj thiab hauv qab ntawm nws lub puab tsaig ntxiv rov qab rau hauv nws lub qhov ncauj.
