Dentin yog nyuaj dua pob txha tab sis softer dua enamel, thiab nws feem ntau yog ua los ntawm phosphoric apatite crystallites. Cov hniav lwj ua rau cov kab noj hniav hauv cov hniav.
Dab tsi yog qhov nyuaj tshaj cov hniav hniav?
Raws li Mohs Hardness Scale, cov hniav nyiaj hniav kub khwv tau 5. Qhov ntawd txhais tau hais tias nws nyuaj, lossis nyuaj, dua steel. Rau kev siv, pob zeb diamond yog cov khoom muaj zog tshaj plaws hauv ntiaj teb, qeb 10 ntawm Mohs nplai.
Dab tsi yog qhov nyuaj ntawm dentine?
Tus nqi nruab nrab hardness rau enamel thiab dentin yog nyob rau hauv thaj tsam ntawm 270 txog 350 KHN (los yog los ntawm 250 txog 360 VHN) thiab los ntawm 50 txog 70 KHN raws4.
Dentin txawv ntawm enamel li cas?
Thaum enamel yog kwv yees li 85% ntxhia, ua ke nrog me me ntawm collagen, cov khoom siv organic thiab dej, dentin yog cov organic heev. Dentin muaj li ntawm 45% ntxhia, nrog rau qhov seem ntawm cov organic teeb meem thiab dej.
Puas dentine yog cov khoom nyuaj tshaj plaws hauv lub cev?
- Cov khoom hnyav tshaj plaws hauv tib neeg lub cev yog enamel. Enamel yog qhov nyuaj tshaj plaws sab nrauv ntawm peb cov hniav thiab yog tsim los ntawm calcium phosphate. - Dentine yog txheej txheej hauv qab enamelthiab yog tsim los ntawm cov hlwb muaj sia uas zais cov tshuaj ntxhia nyuaj.
