Dental Anatomy Permanent Premolars

Question 1

what tooth has the most pronounced developmental marginal groove of any maxillary tooth?

Answer 1

maxillary 1st premolar

Question 2

what maxillary tooth has a mesial concavity that makes it difficult to adapt a matrix band?

Answer 2

maxillary 1st premolar

Question 3

the cervical cross section of the maxillary 1st premolar exhibits a ___shaped root outline

Answer 3

• kidney

- it also exhibits a kidney shaped pulp chamber floor

Question 4

what non-molar tooth that most frequently exhibits 3 roots is the ___

Answer 4

• maxillary 1st premolar

- also the non-molar tooth that usually has 2 roots

Question 5

the facial cusp of the maxillary 1st premolar is offset to the ___

Answer 5

distal

Question 6

which is the only premolar tooth with a mesio-facial cusp ridge that is longer than the disto-facial cusp ridge?

Answer 6

maxillary 1st premolar

Question 7

which premolar exhibits the steepest cusp inclines?

Answer 7

maxillary 1st premolar

Question 8

both maxillary premolar lingual cusps are offset to the ___. where do the buccal cusps of the maxillary premolars offset?

Answer 8

• 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

Question 9

what is the posterior tooth that has the greatest cervico-occlusal crown height?

Answer 9

maxillary 1st premolar

Question 10

what is the non-molar tooth with the sharpest demarcation between pulp chamber and canal?

Answer 10

maxillary 1st premolar

Question 11

the size and position of the cusps are more identical for the (1st/2nd) maxillary premolars than the (1st/2nd)

Answer 11

2nd, 1st

Question 12

which maxillary premolar has two cusps that are of equal height?

Answer 12

maxillary 2nd premolar

Question 13

what is the most symmetrical posterior tooth?

Answer 13

maxillary 2nd premolar (has to do with cusps)

Question 14

which tooth has a wrinkly appearance and why?

Answer 14

maxillary 2nd premolar, due to its short central groove with many supplemental grooves

Question 15

which tooth has fossa that are closest in size compared to any other posterior tooth?

Answer 15

maxillary 2nd premolar

Question 16

what premolar has a uniquely prominent triangular ridge?

Answer 16

• mandibular 1st premolar
• this gives it its characteristic snake eyes
• no central groove

Question 17

which premolar frequently has separate mesial and distal pits?

Answer 17

• mandibular 1st premolar (snake eyes)

- this is due to its triangular ridge

Question 18

which tooth is the only one that has a mesiolingual developmental groove?

Answer 18

mandibular 1st premolar

Question 19

the mesiolingual developmental groove on the mandibular 1st premolar originates from ___

Answer 19

the occlusal pit

Question 20

the mesiolingual developmental groove on the mandibular 1st premolar extends onto the ___ surface

Answer 20

proximal

Question 21

the mesiolingual developmental groove on the mandibular 1st premolar has what affect on the mesial marginal ridge?

Answer 21

it makes it run at a 45 degree angle

Question 22

between the mandibular 1st and 2nd premolars, which one has a mesial marginal ridge that is located more cervical than the distal?

Answer 22

mandibular 1st premolar

Question 23

for a mandibular 1st premolar, more of the occlusal surface can be seen from the (M/D) than the (M/D)

Answer 23

mesial than distal, due to the 45 degree angle of the mesial marginal ridge

Question 24

the occlusal outline for the mandibular 1st premolar from the occlusal view is ___

Answer 24

diamond shaped

Question 25

in the rare event of a second canal for a mandibular 1st premolar, it is most likely located ___

Answer 25

on the lingual

Question 26

what is the only premolar that frequently only has one pulp horn?

Answer 26

mandibular 1st premolar

Question 27

the lingual cusp of the mandibular 1st premolar is approximately ___ the height of the facial cusp

Answer 27

2/3

Question 28

the lingual cusp of the mandibular 1st premolar is similar in development to the ___ of a canine

Answer 28

cingulum

Question 29

the lingual cusp of what tooth, in normal occlusion, does not occlude?

Answer 29

mandibular 1st premolar

Question 30

which tooth has the most variation of all posterior teeth in facial vs lingual cusp height?

Answer 30

mandibular 1st premolar

Question 31

the facial masticatory mucosa (attached gingival) is narrowest on the facial aspect of which teeth?

Answer 31

mandibular premolars

Question 32

which tooth has the smallest FL dimension of all posterior teeth?

Answer 32

mandibular 1st premolar

Question 33

which mandibular tooth is closest of all mandibular teeth in FL vs MD diameter?

Answer 33

mandibular 1st premolar

Question 34

from an occlusal view, what is the coronal outline of a mandibular 2nd premolar? what about the outline of the occlusal table?

Answer 34

- coronal outline is pentagonal | - occlusal table outline is rectangular

Question 35

which premolar is most likely to have a crescent-shaped central developmental groove?

Answer 35

mandibular 2nd premolar

Question 36

where is the shortest interdental papilla located?

Answer 36

between the mandibular 2nd premolar and the 1st molar

Question 37

the Y type mandibular 2nd premolar has how many facial and lingual cusps?

Answer 37

1 facial, 2 lingual

Question 38

the Y type mandibular 2nd premolar has the same number of occlusal pits as what other tooth?

Answer 38

maxillary 1st molar

Question 39

what is the only premolar with multiple lingual cusps?

Answer 39

mandibular 2nd premolar

Question 40

what is the only premolar with a lingual groove?

Answer 40

mandibular 2nd premolar (don't confuse this with the mesiolingual developmental groove of the mandibular 1st premolar)

Question 41

what is the only premolar with a central fossa?

Answer 41

mandibular 2nd premolar

Question 42

the premolar that most frequently has a single central pit is the ___

Answer 42

mandibular 2nd premolar

Question 43

___ is the most congenitally missing premolar

Answer 43

mandibular 2nd premolar