Maxillary premolars Lub maxillary thawj premolar muaj qhov sib txawv morphology tab sis feem ntau suav hais tias muaj ob lub hauv paus thiab ob lub kwj dej (Fig. 1.58).
Puas muaj premolar muaj ob lub hauv paus?
Tus naj npawb ntawm cov hauv paus hniav rau txhua hom hniav sib txawv. Feem ntau incisors, canines thiab premolars yuav muaj ib cagwhereas molars yuav muaj ob lossis peb.
Puas muaj pes tsawg lub hauv paus ob premolar?
Maxillary thib ob premolar feem ntau muaj ib cag nrog ib lossis ob lub hauv paus kwj dej. Raws li qhia los ntawm Vertucci, qhov tshwm sim ntawm ib tug kwj dej nrog ib tug apex yog 75% thiab ob kwj dej ntawm lub apex yog 24%. Lub xub ntiag ntawm peb kwj dej ntawm apex tau pom tias tsuas yog 1%.
Cov hniav twg muaj ob lub hauv paus?
Maxillary thawj premolars thiab mandibular molars feem ntau muaj ob lub hauv paus.
Puas yog premolar muaj 2 lossis 3 cusps?
Kev Ntsuas: Lub mandibular thib ob premolar feem ntaufeem ntau muaj peb cusps tab sis tuaj yeem muaj ob thiab. Peb cusp ntau yam muaj ib tug loj cusp ntawm lub buccal nrog ob tug me lingual cusps.
