Dental Anatomy Permanent Premolars Flashcards
what tooth has the most pronounced developmental marginal groove of any maxillary tooth?
maxillary 1st premolar
what maxillary tooth has a mesial concavity that makes it difficult to adapt a matrix band?
maxillary 1st premolar
the cervical cross section of the maxillary 1st premolar exhibits a ___shaped root outline
- kidney
- it also exhibits a kidney shaped pulp chamber floor
what non-molar tooth that most frequently exhibits 3 roots is the ___
- maxillary 1st premolar
- also the non-molar tooth that usually has 2 roots
the facial cusp of the maxillary 1st premolar is offset to the ___
distal
which is the only premolar tooth with a mesio-facial cusp ridge that is longer than the disto-facial cusp ridge?
maxillary 1st premolar
which premolar exhibits the steepest cusp inclines?
maxillary 1st premolar
both maxillary premolar lingual cusps are offset to the ___. where do the buccal cusps of the maxillary premolars offset?
- lingual cusps offset to the mesial
- buccal cusp of the 1st premolar offsets to the distal
- buccal cusp of the 2nd premolar offsets to the mesial
what is the posterior tooth that has the greatest cervico-occlusal crown height?
maxillary 1st premolar
what is the non-molar tooth with the sharpest demarcation between pulp chamber and canal?
maxillary 1st premolar
the size and position of the cusps are more identical for the (1st/2nd) maxillary premolars than the (1st/2nd)
2nd, 1st
which maxillary premolar has two cusps that are of equal height?
maxillary 2nd premolar
what is the most symmetrical posterior tooth?
maxillary 2nd premolar (has to do with cusps)
which tooth has a wrinkly appearance and why?
maxillary 2nd premolar, due to its short central groove with many supplemental grooves
which tooth has fossa that are closest in size compared to any other posterior tooth?
maxillary 2nd premolar
what premolar has a uniquely prominent triangular ridge?
- mandibular 1st premolar
- this gives it its characteristic snake eyes
- no central groove
which premolar frequently has separate mesial and distal pits?
- mandibular 1st premolar (snake eyes)
- this is due to its triangular ridge
which tooth is the only one that has a mesiolingual developmental groove?
mandibular 1st premolar
the mesiolingual developmental groove on the mandibular 1st premolar originates from ___
the occlusal pit
the mesiolingual developmental groove on the mandibular 1st premolar extends onto the ___ surface
proximal
the mesiolingual developmental groove on the mandibular 1st premolar has what affect on the mesial marginal ridge?
it makes it run at a 45 degree angle
between the mandibular 1st and 2nd premolars, which one has a mesial marginal ridge that is located more cervical than the distal?
mandibular 1st premolar
for a mandibular 1st premolar, more of the occlusal surface can be seen from the (M/D) than the (M/D)
mesial than distal, due to the 45 degree angle of the mesial marginal ridge
the occlusal outline for the mandibular 1st premolar from the occlusal view is ___
diamond shaped
in the rare event of a second canal for a mandibular 1st premolar, it is most likely located ___
on the lingual
what is the only premolar that frequently only has one pulp horn?
mandibular 1st premolar
the lingual cusp of the mandibular 1st premolar is approximately ___ the height of the facial cusp
2/3
the lingual cusp of the mandibular 1st premolar is similar in development to the ___ of a canine
cingulum
the lingual cusp of what tooth, in normal occlusion, does not occlude?
mandibular 1st premolar
which tooth has the most variation of all posterior teeth in facial vs lingual cusp height?
mandibular 1st premolar
the facial masticatory mucosa (attached gingival) is narrowest on the facial aspect of which teeth?
mandibular premolars
which tooth has the smallest FL dimension of all posterior teeth?
mandibular 1st premolar
which mandibular tooth is closest of all mandibular teeth in FL vs MD diameter?
mandibular 1st premolar
from an occlusal view, what is the coronal outline of a mandibular 2nd premolar? what about the outline of the occlusal table?
- coronal outline is pentagonal
- occlusal table outline is rectangular
which premolar is most likely to have a crescent-shaped central developmental groove?
mandibular 2nd premolar
where is the shortest interdental papilla located?
between the mandibular 2nd premolar and the 1st molar
the Y type mandibular 2nd premolar has how many facial and lingual cusps?
1 facial, 2 lingual
the Y type mandibular 2nd premolar has the same number of occlusal pits as what other tooth?
maxillary 1st molar
what is the only premolar with multiple lingual cusps?
mandibular 2nd premolar
what is the only premolar with a lingual groove?
mandibular 2nd premolar (don’t confuse this with the mesiolingual developmental groove of the mandibular 1st premolar)
what is the only premolar with a central fossa?
mandibular 2nd premolar
the premolar that most frequently has a single central pit is the ___
mandibular 2nd premolar
___ is the most congenitally missing premolar
mandibular 2nd premolar
