Cov canines (los yog cuspids, txhais tau tias ib tug hniav nrog ib tug taw tes) nyob rau ntawm ob sab ntawm lub incisors. Lawv yog rau tuav thiab rhuav cov zaub mov. Premolars (bicuspids) thiab cov molars muaj ntau qhov kev nce siab (cov ntsiab lus lossis 'cusps') uas yog siv los rhuav tshem cov khoom noj.
Puas yog cov molars thiab bicuspids tib yam?
Ib yam li cov hniav bicuspid. Bicuspids tseem hu ua cov hniav premolar vim tias lawv nyob nruab nrab ntawm peb cov canines thiab peb cov molars nyob rau sab nraub qaum ntawm peb lub qhov ncauj. Bicuspid yog lub npe nrov tshaj. Bicuspid los yog premolar hniav feem ntau tuaj ntawm cov hnub nyoog 12 thiab 13.
cuspids thiab bicuspids nyob qhov twg?
ncej hniav. Hais txog rau rau sab sauv thiab rau sab qis nyob rau pem hauv ntej ntawm lub qhov ncauj; suav nrog incisors thiab cuspids. Cov hniav anterior thiab bicuspids yog cov hniav uas qhia thaum koj luag nyav. Cov hniav no yog plaub thiab tsib hniav thaum peb suav los ntawm nruab nrab ntawm lub qhov ncauj.
Dab tsi yog maxillary cuspids?
Tus maxillary cuspid (sab saum qhov muag hniav) yog thib ob feem ntau cov hniav los ua cuam tshuam. Cov hniav cuspid yog cov hniav tseem ceeb hauv cov hniav hniav thiab ua lub luag haujlwm tseem ceeb hauv koj qhov tom. Cov hniav cuspid muaj zog heev tom cov hniav uas muaj cov cag ntev tshaj plaws ntawm tib neeg cov hniav.
hniav yog dab tsi?
Tib neeg cov hniav yog tsim los ntawm plaub hom ntaub so ntswg: pulp, dentin, enamel, thiab cementum. Lub pulp yogqhov innermost ntawm cov hniav thiab muaj cov ntaub so ntswg, paj hlwb, thiab cov hlab ntsha, uas txhawb cov hniav.
