Qhov Tseem Ceeb Qhov txawv - Maxillary vs Mandibular Molars
Cia peb xub pom lub ntsiab lus ntawm ob nqe lus, maxillary, thiab mandibular, ua ntej saib qhov txawv ntawm lawv. Maxillary molars yog cov molars nyob rau hauv lub puab tsaig sab sauv thaum lub mandibular molars yog cov molars nyob rau hauv lub puab tsaig sab. Hauv ib tus neeg laus, muaj plaub hom hniav pom nyob rau hauv ob qho tib si maxilla thiab mandible, uas yog; incisors (8), canine (4), premolars (8), thiab molars (12). Hauv tsab xov xwm no, peb tsuas yog tsom rau qhov sib txawv ntawm maxillary thiab mandibular molars. Muaj 6 molars nyob rau hauv txhua lub koov, thiab peb molars ntawm ob sab ntawm koov. Lub crown ntawm molars tau hloov mus rau hauv ib qho occlusal (chewing) nto nrog 3 mus rau 5 cusps. Ntxiv mus, qhov chaw occlusal ntawm cov molars loj dua li ntawm lwm cov hniav. Lub luag haujlwm tseem ceeb ntawm cov molars muaj xws li mastication ntawm cov zaub mov, kev saib xyuas ntawm ntsug qhov ntev ntawm lub ntsej muag, thiab pab kom lwm cov hniav nyob rau hauv kev sib raug zoo. Qhov sib txawv tseem ceeb ntawm lawv tuaj yeem pom hauv lawv txoj haujlwm thiab cov qauv.
Maxillary Molars yog dab tsi?
Maxillary molars yog 6 molars ntawm maxillary arch. Nyob rau hauv cov lus pom, geometric daim ntawv ntawm cov molars yog ib tug trapezoid. Nyob rau hauv occlusal saib, cov hniav no yog rhomboid nrog 2 mob thiab 2 obtuse kaum. Lawv muaj ob lub khob buccal thiab ib buccal zawj. Lub buccal nto yog verticle. Maxillary molars muaj 3 cov hauv paus hniav nrog tripod kev npaj, uas txhim kho cov anchorage hauv pob txha alveolar. Lub xub ntiag ntawm oblique ridge nyob rau hauv occlusal nto yog ib tug yam ntxwv feature ntawm lub maxillary molar. Lub crown ntawm maxillary molar yog nyob nruab nrab ntawm lub hauv paus.
Mandibular Molars yog dab tsi?
Mandibular molars yog 6 molars pom ntawm mandibular arch. Lawv muaj 2 lub hauv paus thiab tsis muaj oblique ridge. Nyob rau hauv lub buccal nam, geometric daim ntawv ntawm mandibular molar yog trapezoid thaum nyob rau hauv proximal yam nws yog rhomboid. Qhov dav mesiodistal ntawm cov hniav no ntau dua li qhov siab ntawm cov yas. Cov khob buccal yog blunt thiab feem ntau attrited. Muaj ob lub pob txha ntawm 1st molar thiab ib leeg kab ntawm 2nd thiab 3rd molar. Lub ncauj tsev menyuam ridge ntawm mandibular molar yog qhov tseem ceeb, tshwj xeeb tshaj yog nyob rau ntawm 1st molar.
Qhov txawv ntawm Maxillary thiab Mandibular Molars yog dab tsi?
Yam ntxwv ntawm Maxillary thiab Mandibular Molars
Buccal saib
khob khob
Maxillary molars: Maxillary molars muaj ob lub khob khob.
Mandibular molar: Mandibular molars muaj ob lossis peb lub khob khob.
Buccal groove
Maxillary molars: Maxillary molars muaj ib qho buccal groove.
Mandibular molar: Mandibular molars muaj ob ntawm thawj molar buccal zawj.
ntau tus cag
Maxillary molars: Maxillary molars muaj peb cag.
Mandibular molar: Mandibular molars muaj ob lub hauv paus.
kub cev
Maxillary molars: Maxillary molars muaj lub hauv paus ntev dua.
Mandibular molar: Mandibular molars muaj lub hauv paus luv dua.
Lingual view
Maxillary molars: Hauv maxillary molars, Cervix ntawm crown tapers ntau dua rau lingual.
Mandibular molar: Hauv Mandibular molar Cervix ntawm cov yas tapers tsawg dua rau cov lus.
khob ntawm Carabelli
Maxillary molars: Khob ntawm Carabelli feem ntau pom ntawm thawj cov molar hauv maxillary molar.
Mandibular molar: Khob ntawm Carabelli tsis nyob hauv mandibular molar:
saib ze
Nkauj
Maxillary molars: Maxillary molar: crown yog ntau qhov chaw nyob hauv paus.
Mandibular molar: Mandibular molar: crown yog tipped ntau lingual tshaj hauv paus.
Occlusal saib
Oblique ridge
Maxillary molars: Maxillary molar: Oblique ridge yog tam sim no.
Mandibular molar: Mandibular molar: Oblique ridge tsis tuaj.
Kev hloov pauv
Maxillary molars: Maxillary molar muaj tsuas yog ib qho Transverse ridge.
Mandibular molar: Mandibular molar muaj ob txoj kab rov tav.
Nkauj
Maxillary molars: Crown ntawm Maxillary molar yog square zoo li tus.
Mandibular molar: Crown ntawm Mandibular molar yog pentagon zoo li tus.
Fossae
Maxillary molars: Maxillary molar muaj plaub; loj central thiab cigar-zoo li distal fossae.
Mandibular molar: Mandibular molar muaj peb fossae; lub hauv paus yog qhov loj tshaj.
Image Courtesy: "Lub puab tsaig sab sauv" los ntawm Tsis muaj tshuab nyeem tau tus sau tau muab. Xauxa assumed (raws li copyright claims). - Tsis muaj tshuab nyeem tau qhov chaw muab. Tus kheej ua haujlwm tau xav tias (raws li kev thov kev cai lij choj).(CC BY 2.5) ntawm Wikimedia Commons "Lub puab tsaig qis" los ntawm Tsis muaj lub tshuab nyeem tau muab. Xauxa assumed (raws li copyright claims). - Tsis muaj tshuab nyeem tau qhov chaw muab. Tus kheej ua haujlwm xav tias (raws li kev thov kev cai lij choj).(CC BY 2.5) ntawm Wikimedia Commons
