Qhov Tseem Ceeb Qhov txawv - Thawj vs Thib Ob Premolar
Premolars yog cov hniav uas nyob nruab nrab ntawm cov canine thiab molar. Lawv kuj tseem hu ua cov hniav hloov pauv thiab feem ntau koom nrog hauv mastication ntawm cov zaub mov. Muaj ob hom premolars; mandibular premolar thiab maxillary premolar. Hauv tib neeg, cov premolars tau muab faib ua thawj thiab thib ob premolars. Thawj premolar tuaj yeem yog mandibular thawj premolar lossis maxillary thawj premolar. Lub maxillary thawj premolar nyob rau hauv lub puab tsaig sab sauv, whereas lub mandibular premolars nyob rau hauv lub puab tsaig sab. Qhov thib ob premolar tuaj yeem raug cais raws li qhov thib ob maxillary premolar nyob rau hauv lub puab tsaig sab sauv thiab qhov thib ob mandibular premolar nyob rau hauv lub puab tsaig sab. Qhov sib txawv tseem ceeb ntawm thawj thiab thib ob premolars yog nyob ntawm lawv qhov kev pom sab buccal. Thawj premolars yog ntse heev nyob rau hauv lawv buccal sab, whereas lub thib ob premolars yog tsawg ntse nyob rau hauv lawv buccal sab.
Dab tsi yog Thawj Premolar?
Thawj premolar yog ib qho ntawm cov premolars npe raws li nws qhov kev faib tawm. Yog li, thawj premolar tuaj yeem faib ua thawj mandibular premolar thiab thawj maxillary premolar. Thawj mandibular premolar yog nyob tom qab ntawm lub puab tsaig sab qis ntawm qhov nruab nrab ntawm lub ntsej muag. Lub luag haujlwm yog los rhuav cov zaub mov thaum lub sijhawm mastication thiab pab cov canines. Thawj mandibular premolars yog tsim los ntawm ob cusps, thiab los ntawm sab buccal, nws zoo nkaus li ib tug loj thiab ntse hniav. Deciduous mandibular thawj premolar tsis tuaj.
Daim duab 01: Mandibular Thawj Premolar
Lub maxillary thawj premolar nyob rau hauv lub puab tsaig sab sauv. Nws nyob tom qab, zoo ib yam li mandibular thawj premolar. Lub luag haujlwm yog los pab hauv kev rhuav tshem cov zaub mov, uas yog txheej txheem tseem ceeb hauv mastication. Cov maxillary thawj premolars kuj pab cov canines hauv cov txheej txheem no. Thawj maxillary premolar muaj ob lub cusps thiab tshwm raws li cov hniav ntse los ntawm qhov pom ntawm qhov muag. Deciduous maxillary premolars tsis tuaj. Thawj cov molars (deciduous) yog hloov los ntawm thawj premolars thaum lub sij hawm kev loj hlob ntawm cov hniav.
Dab tsi yog qhov Premolar thib ob?
Thib ob premolars yog lwm hom premolars tam sim no nyob rau hauv tib neeg thiab tuaj yeem categorized li mandibular thiab maxillary thib ob premolars. Lub mandibular thib ob premolar nyob rau hauv lub puab tsaig qis thiab yog distally nyob deb ntawm lub ntsej muag. Lub mandibular thib ob premolars pab cov txheej txheem ntawm mastication thiab pab cov canines nyob rau hauv lub zom thiab sib tsoo txheej txheem. Lub mandibular thib ob premolars muaj peb cusps thiab ib tug loj cusp nyob rau sab buccal. Lub buccal sab ntawm lub thib ob mandibular premolar yog tsawg ntse. Deciduous mandibular thib ob premolar tsis tuaj.
Daim duab 02: Thib Ob Premolar
Qhov thib ob maxillary premolar hniav yog nyob rau hauv lub puab tsaig sab sauv thiab tom qab nyob ntawm ob lub maxillary thawj premolar thiab maxillary molar cov hniav. Lub luag haujlwm ntawm qhov thib ob maxillary premolar yog pab hauv kev sib tsoo los yog zom zaub mov. Cov qauv ntawm qhov thib ob maxillary premolar muaj ob lub cusps, tab sis lub buccal saib tsis tshua muaj ntse. Deciduous thib ob maxillary premolars tsis tuaj, thiab lawv tshwm sim raws li kev tshem tawm ntawm deciduous thawj molars.
Dab tsi zoo sib xws ntawm Thawj thiab Thib Ob Premolar?
- Ob hom thawj thiab thib ob Premolar muaj rau tib neeg cov hniav.
- Ob hom thawj thiab thib ob Premolar tuaj yeem faib ua mandibular thiab maxillary.
- Ob Thawj thiab Thib Ob Premolar tsis muaj cov hniav deciduous.
- Ob Thawj thiab Thib Ob Premolar koom nrog cov txheej txheem mastication.
- Ob Thawj thiab Thib Ob Premolar pab ua haujlwm ntawm canines.
Qhov txawv ntawm Thawj thiab Thib Ob yog dab tsi?
First vs Second Premolar |
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| thawj premolar yog ib qho ntawm cov premolars uas muaj nyob rau hauv tib neeg thiab tuaj yeem faib ua thawj mandibular premolar thiab thawj maxillary premolar. | Thib ob premolars yog ib hom premolars tam sim no nyob rau hauv tib neeg thiab tuaj yeem categorized li mandibular thiab maxillary thib ob premolars. |
| Npua Sab Saib | |
| Thawj premolar muaj lub ntsej muag ntse pom | Thib ob premolar muaj qhov tsis tshua pom ntawm lub ntsej muag pom. |
Summary – First vs Second Premolar
Premolars yog hom hniav tseem ceeb ntawm tib neeg koom nrog hauv kev tsim kua muag thiab zom cov txheej txheem ntawm mastication. Ob lub ntsiab premolars tuaj yeem pom hauv tib neeg uas yog thawj thiab thib ob premolars. Lawv tuaj yeem muab faib ua mandibular thiab maxillary thawj thiab thib ob premolars. Tag nrho plaub hom premolars tsis yog cov hniav deciduous, tab sis qhov sib txawv tseem ceeb nyob hauv lawv qhov pom ntawm qhov muag. Thawj premolars yog sharper whereas lub thib ob premolars yog tsawg sharper. Qhov no yog qhov txawv ntawm thawj premolar thiab thib ob premolar.
