Qhov sib txawv tseem ceeb ntawm cellular thiab acellular cementum yog tias cellular cementum yog tuab thiab npog lub apical ib nrab ntawm cov hauv paus hniav, thaum acellular cementum kuj nyias thiab npog lub ncauj tsev menyuam ib nrab ntawm cov hauv paus hniav.
Cementum yog cov pob txha zoo li cov ntaub so ntswg uas ua rau cov dentin ntawm cov hauv paus hniav thaum tiv thaiv cov hauv paus hniav. Nws yog ib txheej nyias ntawm cov ntaub so ntswg nyuaj tsim los ntawm cov hlwb hu ua cementoblasts. Nws tsim los ntawm cov hlwb tsis txawv mesenchymal nyob rau hauv cov ntaub so ntswg ntawm cov hniav follicles. Cementum muaj collagen fibrils. Cov hlwb ntawm cementum entrap cementocytes, thiab txhua cementocyte nyob hauv lacuna. Lacuna kuj muaj cov kwj dej, tab sis tsis zoo li cov pob txha, lawv tsis muaj qab haus huv. Cov kwj dej no taw qhia mus rau lub sijhawm ligament thiab muaj cov txheej txheem cementocytic kom diffuse cov as-ham los ntawm vascularized ligament. Sharpey's fibers yog ib feem ntawm lub hauv paus collagen fibers ntawm lub paj hlwb ligament embedded nyob rau hauv cov cementum thiab alveolar pob txha los txuas cov hniav mus rau alveolus. Cementum muab faib ua acellular thiab cellular cementum raws li muaj thiab tsis muaj cementocytes hauv matrix ntawm cementum.
Cellular Cementum yog dab tsi?
Cellular cementum yog qhov nruab nrab ntawm kev txuas rau collagen fibers rau cov pob txha alveolar, thiab nws muaj cov hlwb. Nws yog lub luag haujlwm rau kev kho me me ntawm txhua qhov resorption ua raws li kev tso nyiaj kom tswj tau cov cuab yeej txuas kom zoo. Feem ntau, cellular cementum yog tuab thiab npog lub hauv paus apical. Cellular intrinsic fiber cementum (CIFC) sib raug nrog cellular cementum. Nws yog tsim los ntawm intrinsic fibers uas khiav parallel mus rau hauv paus nto. Nws tsis muaj qhov ntse fiber ntau tsim. Cellular cementum yog cov cellular tsawg dua cov pob txha thiab muaj cov cemented seam rau sab nrauv. CIFC feem ntau muaj ob qho tib si extrinsic thiab intrinsic fibers. Nws muaj ib qho tseem ceeb hauv nruab nrab uas tsis muaj mineralized nyob ib puag ncig los ntawm ib qho tseem ceeb mineralized cortical.
Daim duab 01: Tib Neeg Hniav
Acellular Cementum yog dab tsi?
Acellular cementum tsis muaj cov hlwb thiab feem ntau muaj kev hloov pauv. Acellular cementum yog nyias thiab npog lub ncauj tsev menyuam hauv paus. Acellular extrinsic fiber cementum (AEFC) sib raug nrog acellular cementum pom nyob rau hauv lub ncauj tsev menyuam ob feem peb. Cov fibers muab tau los yog Sharpey's fibers. Lawv tsim maj mam, thiab cov hauv paus hniav ntawm cov cementum yog du. AEFC npog lub ncauj tsev menyuam hauv paus hniav nyob rau hauv ob qho tib si mus tas li thiab deciduous hniav. Nws muaj collagen fibers thiab non-collagenous proteins li organic matrices; Txawm li cas los xij, lawv yog cov mineralized tag nrho. Cov no kuj tau ntim khoom thiab tau npaj ua ke rau lub hauv paus sab.
Dab tsi zoo sib xws ntawm Cellular thiab Acellular Cementum?
- Cellular thiab acellular cementum yog ob feem pom hauv cov hniav.
- Ob leeg yog calcified.
- Ntxiv mus, lawv muaj Sharpey cov fibers.
- Extrinsic collagen fibers muaj nyob rau hauv ob lub cellular thiab acellular cementum.
Qhov txawv ntawm Cellular thiab Acellular Cementum yog dab tsi?
Cellular cementum yog tuab thiab npog lub apical ib nrab ntawm cov hauv paus hniav, thaum acellular cementum kuj nyias thiab npog lub ncauj tsev menyuam ib nrab ntawm cov hauv paus hniav. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm cellular thiab acellular cementum. Feem ntau ntawm cov cellular cementum cov ntaub ntawv tom qab cov hniav mus txog qhov chaw occlusal, thaum feem ntau ntawm acellular cementum cov ntaub ntawv ua ntej cov hniav mus txog lub dav hlau occlusal. Ntxiv mus, cellular cementum muaj cov cementocytes, thaum acellular cementum tsis muaj cementocytes.
Cov hauv qab no qhia txog qhov sib txawv ntawm cellular thiab acellular cementum hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Cellular vs Acellular Cementum
Cementum yog cov pob txha zoo li cov ntaub so ntswg uas ua cov kab dentin ntawm cov hauv paus hniav thaum tiv thaiv cov hauv paus hniav. Cellular cementum kuj yog tuab thiab npog lub apical ib nrab ntawm cov hauv paus hniav, thaum acellular cementum kuj yog nyias thiab npog lub ncauj tsev menyuam ib nrab ntawm cov hauv paus hniav. Ntxiv mus, cellular cementum yog qhov nruab nrab ntawm kev txuas rau collagen fibers rau cov pob txha alveolar, thiab nws muaj cov hlwb. Acellular cementum, ntawm qhov tod tes, tsis muaj cov hlwb thiab feem ntau muaj kev hloov pauv. Acellular cementum yog tsim thaum pib, thiab cellular cementum yog tsim tom qab. Feem ntau ntawm cov cellular cementum cov ntaub ntawv tom qab cov hniav mus txog qhov chaw occlusal, thaum feem ntau ntawm acellular cementum cov ntaub ntawv ua ntej cov hniav mus txog lub dav hlau occlusal. Txoj kev loj hlob ntawm cellular cementum yog sai dua acellular cementum. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm cellular thiab acellular cementum.
