Qhov sib txawv tseem ceeb ntawm cov hniav lwj thiab cov hniav tas mus li yog cov hniav lwj yog cov hniav ib ntus uas tsim thaum yug los thiab poob thaum muaj hnub nyoog 5-6 xyoo, thaum cov hniav ruaj khov thaum muaj hnub nyoog 5-6 xyoo thiab nyob ruaj khov mus ib txhis.
Cov hniav yog cov khoom hnyav tshaj plaws thiab muaj zog tshaj plaws hauv tib neeg lub cev. Sib nrug los ntawm kev ua haujlwm ntawm zom, cov hniav ua lub luag haujlwm tseem ceeb hauv kev hais lus. Qhov chaw ntawm cov hniav muaj xws li enamel, dentine, pulp, thiab cementum. Enamel yog qhov nyuaj thiab sab nraud dawb ntawm cov hniav thaum dentine yog txheej hauv qab cov enamel. Lub pulp yog cov qauv mos ntawm cov hniav uas muaj cov hlab ntsha thiab cov hlab ntsha. Cov cementum yog ib txheej ntawm cov ntaub so ntswg uas khi cov hauv paus hniav rau cov pos hniav thiab lub puab tsaig. Txoj kev loj hlob ntawm cov hniav tshwm sim nyob rau hauv ob theem thiab yog categorized li deciduous cov hniav thiab cov hniav mus tas li.
Dab tsi yog Deciduous Teeth?
Cov hniav lwj, uas tseem hu ua thawj cov hniav lossis cov hniav, yog thawj cov hniav hauv kev loj hlob thiab kev loj hlob ntawm tib neeg thiab cov tsiaj txhu feem ntau. Cov hniav deciduous tsim thaum lub sij hawm embryonic theem thiab me nyuam mos. Tom qab ntawd, lawv raug hloov los ntawm cov hniav mus tas li. Cov hniav deciduous pib tsim nyob rau lub lim tiam thib rau ntawm cov hniav hauv lub embryo. Feem ntau, nws pib nyob rau nruab nrab thiab kis rov qab mus rau thaj tsam tom qab. Nyob rau hauv lub yim lub lim tiam ntawm lub embryo, muaj kaum hniav buds nyob rau sab sauv thiab sab arches uas tsim los ua deciduous hniav. Cov hniav no muaj xws li central incisors, lateral incisors, canines, thiab thawj thiab thib ob molars. Muaj ib qho ntawm txhua lub quadrant, ua plaub ntawm txhua tus hniav. Tom qab, thawj thiab thib ob molars yog hloov nrog premolars ntawm cov hniav mus tas li.
Daim duab 01: Cov hniav lwj
Cov hniav lwj yog qhov tseem ceeb rau kev loj hlob ntawm lub qhov ncauj. Lawv tuav qhov ntev ntawm lub puab tsaig; Cov pob txha thiab cov hniav hloov mus tas li tsim los ntawm cov kab mob tib yam li cov hniav deciduous. Lawv kuj muab kev taw qhia rau txoj hauv kev ntawm cov hniav eruption thaum cov hniav mus tas li. Tsis tas li ntawd, lawv pab hais lus, luag ntxhi, thiab zom zaub mov thaum yau. Txawm li cas los xij, kev kho hniav caries, uas tseem hu ua cov hniav lwj, yog ib yam kab mob ntau tshaj plaws ntawm cov menyuam yaus. Nws yog ib qho mob ntawm qhov ncauj uas cuam tshuam cov kab mob uas ua rau cov hniav puas. Cov hniav lwj ntau heev ntawm cov hniav deciduous.
Cov hniav tas li yog dab tsi?
Cov hniav tas mus li tseem hu ua cov hniav laus, thiab lawv yog cov hniav thib ob uas tsim los ntawm tib neeg thiab tsiaj txhu feem ntau. Muaj peb caug-ob tus hniav tas mus li ntawm tus neeg laus, muaj rau maxillary thiab rau mandibular molars, plaub maxillary thiab plaub mandibular premolars, ob maxillary, ob mandibular canines, thiab plaub maxillary thiab plaub mandibular incisors.
Daim duab 02: Cov hniav tas mus li
Thawj cov hniav feem ntau tshwm sim thaum muaj hnub nyoog ib ncig ntawm rau xyoo, thaum lub qhov ncauj yuav nyob rau hauv ib qho kev hloov pauv nrog cov hniav deciduous thiab mus tas li. Thawj cov hniav kom tawg yog thawj cov molars, uas yog tom qab cov molars kawg ntawm thawj cov hniav. Thawj cov molars tas mus li no yog qhov tseem ceeb hauv kev txhim kho kom raug ntawm cov hniav mus tas li. Plaub cov hniav tas mus li feem ntau tshwm sim thaum muaj hnub nyoog kaum xya thiab peb caug yim xyoo thiab paub tias yog cov hniav txawj ntse. Muaj cov xwm txheej uas muaj cov hniav ntxiv thiab cov xwm txheej zoo li no hu ua hyperdontia. Cov hniav no tawg mus rau hauv lub qhov ncauj los yog nyob twj ywm rau hauv cov pob txha. Lub luag haujlwm tseem ceeb ntawm cov hniav laus yog los koom nrog cov txheej txheem digestion thiab pab hais lus.
Dab tsi zoo sib xws ntawm cov hniav deciduous thiab cov hniav tas mus li?
- Cov hniav lwj thiab cov hniav tas mus li tsim nyob rau hauv lub qhov ncauj.
- Cov qauv muaj cov enamel, dentine, crown, cag, thiab pulp.
- Ntxiv mus, ob qho tib si ntawm cov hniav muaj incisors, canines, thiab molars.
- Cov hniav lwj thiab cov hniav ruaj khov pab zom, zom zom, nrog rau, hauv kev hais lus.
- Cov hniav yog faib rau sab sauv thiab sab puab tsaig.
Qhov txawv ntawm cov hniav lwj thiab cov hniav tas mus li yog dab tsi?
Cov hniav lwj yog cov hniav ib ntus uas tsim thaum yug los thiab poob thaum muaj hnub nyoog 5 -6 xyoo, thaum cov hniav ruaj khov thaum muaj hnub nyoog 5-6 xyoo thiab nyob ruaj khov mus ib txhis. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm cov hniav lwj thiab cov hniav tas mus li. Cov hniav deciduous tshwm nyob rau hauv cov xim sib zog, thaum cov hniav mus tas li yog xim dub ntau dua. Tus naj npawb ntawm cov hniav deciduous yog 20, tab sis tus naj npawb ntawm cov hniav mus tas li yog 32.
Cov duab hauv qab no nthuav tawm qhov sib txawv ntawm cov hniav lwj thiab cov hniav mus tas li hauv daim ntawv qhia rau ib sab ntawm kev sib piv.
Summary – Deciduous vs Permanent Teeth
Hniav yog cov khoom hnyav tshaj plaws thiab muaj zog tshaj plaws hauv tib neeg lub cev thiab ua lub luag haujlwm tseem ceeb hauv kev zom thiab hais lus. Txoj kev loj hlob ntawm cov hniav tshwm sim nyob rau hauv ob theem thiab yog categorized li deciduous cov hniav thiab cov hniav mus tas li. Cov hniav tsis tu ncua yog cov hniav ib ntus uas tsim thaum yug los thiab poob thaum muaj hnub nyoog 5-6 xyoo, thaum cov hniav ruaj khov thaum muaj hnub nyoog 5-6 xyoo thiab nyob ruaj khov mus tas li. Cov hniav deciduous pib tsim thaum lub sij hawm embryonic txoj kev loj hlob thiab pom nyob rau ntawm rau lub hlis, thiab 20 cov hniav nyob rau hauv tag nrho. Cov hniav tas mus li pib tsim thaum muaj hnub nyoog rau xyoo thiab muaj 32 cov hniav hauv tag nrho. Yog li, qhov no qhia txog qhov sib txawv ntawm cov hniav lwj thiab cov hniav mus tas li.
