Maxillary Premolars (permanent)

Question 1

Universal number for maxillary first premolars

Answer 1

5 & 12

Question 2

What proximal geometric shape does the first permanent maxillary molar have? Tapers which way?

Answer 2

Trapezoidal (tapers occlusally)

Question 3

What proximal geometric shape does each maxillary posterior tooth have?

Answer 3

Trapezoidal (tapers cervically)

Question 4

What geometrical shape from the occlusal view does the permanent maxillary first premolar have?

Answer 4

Hexagonal shape

Question 5

How many developmental lobes does the permanent maxillary first premolar have? What are their names?

Answer 5

4 development lobes (mesiobuccal, distobuccla, mesiolingual, distolingual)

Question 6

How many cusps does thepermanent maxillary first premolar have?

Answer 6

2 (buccal & lingual)

Question 7

Which cusp is bigger on a permanent maxillary first premolar?

Answer 7

F > L (but relatively same in size when compared to mandibular first premolar)

Question 8

What is the primary function of permanent maxillary first premolar?

Answer 8

To assist canine in tearing & piercing

essentially a grinding tooth

Question 9

When is the initial calcification, enamel competition, eruption, & root competition of permanent maxillary first premolar?

Answer 9

initial calcification 1.5 to 1.75 years
enamel completion 5 - 6 y.
eruption 10 - 11 y.
root completion 12 - 13 y.

Question 10

Which anterior tooth does the permanent maxillary first premolar resemble?

Answer 10

Canine

Question 11

Where is the Facial-HOC on a permanent maxillary first premolar?

Answer 11

Cervical Third

Question 12

True/False –> the Occlusal - Cervical Dimension form the facial view of the permanent maxillary first premolar is longer/greater than the maxillary 2nd premolar?

Answer 12

True

Question 13

From the facial view, the mesial-HOC of the permanent maxillary first premolar is located where?

Answer 13

Mesial-HOC is at the occlusal-middle thirds

Question 14

How doe the Mesial and Distal anatomy compare from the facial view of the permanent maxillary first premolar?

Answer 14

Mesial outline has a convexity at HOC and concavity cervically.
Distal outline has greater convexity and less of a concavity.

Question 15

In which direction does the buccal cusp tip of the permanent maxillary first premolar point from a facial view relative to the midline of the root?

Answer 15

Cusp tip points distally from the midline of the root

Question 16

Which buccal cusp ridge is longer/shorter on a permanent maxillary first premolar?

Answer 16

Mesialbuccal cusp ridge is longer
Distobuccal cusp ridge is shorter
(opposite for maxillary canine)

Question 17

In which direction does the lingual cusp tip of the permanent maxillary first premolar point from a lingual view relative to the midline of the root?

Answer 17

Cusp tip points mesially from the midline

lingual cusp is offset to mesial

Question 18

Where is the lingual-HOC for all posterior teeth?

Answer 18

Middle third

Question 19

Where is the lingual - HOC for the permanent maxillary first premolar?

Answer 19

Middle third

Question 20

Which cusp of the all maxillary premolars is the shortest (OC)?

Answer 20

Lingual Cusp of the first permanent maxillary premolar

Question 21

Are the Buccal(facial) & lingual cusps of the first permanent maxillary premolar centered over the root trunk or are they offset facially / lingually from mesial view?

Answer 21

Facial & Lingual Cusps of the first permanent maxillary premolar are centered over the root trunk from the mesial view

Question 22

Is there strong mesial marginal groove visible on a first permanent maxillary premolar?

Answer 22

Yes, strong mesial marginal groove

Question 23

What is one distinguishing or unique feature of the first permanent maxillary premolar from the mesial view in relationship to concavity?

Answer 23

First permanent maxillary premolar have a strong mesial concavity from root trunk to cervical portion of the crown.

Question 24

Where specifically is the mesial-HOC from the mesial view of the first permanent maxillary premolar?

Answer 24

Mesial HOC is facial to the midline (because buccal cusp is slightly larger than lingual cusp)

Question 25

Lingual cusp of maxillary first premolar is offset mesially and buccal cusp is offset distally

Answer 25

...

Question 26

which two teeth have mesial marginal groove?

Answer 26

Mandibular and maxillary first premolar

Question 27

Compare the mesial and distal marginal ridges on a maxillary first premolar

Answer 27

Distal marginal ridge on a maxillary first premolar is more cervical thus have a shorter OC distance --> more occlusal surface is visible from distal view than mesial

Question 28

From which view (mesial / distal) of a maxillary first premolar can one see more of the occlusal table

Answer 28

Form distal view (why?)

Question 29

compare the distal and mesial contact area of a mandibular first premolar

Answer 29

distal contact area is slightly more cervical and facial than mesial on a maxillary first premolar

Question 30

Mesial marginal ridge is shorter / longer than distal marginal ridge for maxillary first premolar.

Answer 30

Mesial marginal ridge on a maxillary first premolar is shorter than distal marginal ridge

Question 31

Mesial contact area is more lingual / facial than distal on a maxillary first premolar

Answer 31

Mesial contact area is more lingual than distal on a maxillary first premolar.

Question 32

which tooth has the deepest central groove of all posterior teeth?

Answer 32

maxillary first premolar

Question 33

Which angle is acute and which angle is 90 degrees on a maxillary first premolar.

Answer 33

maxillary first premolar distal buccal ridge - distal marginal ridge is an acute angle mesial buccal ridge - mesial marginal ridge

Question 34

What is Root Type I and to which tooth does it belong to?

Answer 34

Maxillary first premolar Cervical root Cross Section = kidney or bean shape Still has two canals (Facial and Lingual)

Question 35

What is Root Type II and to which tooth does it belong to?

Answer 35

Maxillary first premolar Most common form short root trunk cervical cross section is bean shaped

Question 36

What is Root Type III and to which tooth does it belong to?

Answer 36

``` Maxillary first premolar Longer Root trunk Laminated Root Mid-root cross section is hourglass cervical cross section is bean shaped ```

Question 37

In which tooth is trifurcation possible?

Answer 37

Trifurcation is possible in Maxillary first premolar (2 buccal + 1 lingual)

Question 38

Which tooth is smaller / bigger? Maxillary first or second premolar

Answer 38

Maxillary first premolar is bigger

Question 39

Which tooth is more rounded / angular ? Maxillary first or second premolar?

Answer 39

Maxillary first is more angular | Maxillary second is more rounded

Question 40

Are the mesial and distal pits closer or farther apart in maxillary first premolar?

Answer 40

mesial and distal pits are closer together due to shoot central groove on a Maxillary second premolar

Question 41

Will one see more or less supplemental grooves in maxillary second premolar?

Answer 41

There are more supplemental grooves in maxillary second premolar than maxillary first premolar

Question 42

IS there mesial concavity or mesial marginal groove present on Maxillary second premolar

Answer 42

No

Question 43

Which two pair teeth have symmetry on both side?

Answer 43

Mandibular central incisors & maxillary second premolars

Question 44

Which premolars are most symmetrical?

Answer 44

Maxillary second premolars

Question 45

DO maxillary second premolar root exhibit depressions?

Answer 45

No, only maxillary first premolar (remember, maxillary second premolar exhibit symmetry so they can't have any depressions)