Maxillary Premolars

Question 1

From a facial view of the maxillary 1st premolar, which cusp slope is longer, mesial or distal?
a. Maxillary 2nd Premolar?

Answer 1

MB

a. DB

Question 2

From a facial view of a maxillary 1st, where is the cusp tip located relative to the mid-root long axis?
a. Compare with the maxillary 2nd premolar?

Answer 2

Distal to Mid-root

a. Mesial to mid-root

Question 3

How many root forms does the maxillary 1st premolar normally present?

a. Which form is most often seen?
b. What are the root cross-section of each type of root form
i. Cervical root line?
ii. Mid root line?

Answer 3

3 (Single root, bifurcated, laminated)

a. Bifurcated
b. A
i. Single root, bifurcated & laminated = bean shaped
ii. Single root = bean-shaped / bifurcated = two separate root outlines / laminated = hour glass

Question 4

Which proximal surface of a maxillary 1st premolar exhibits more convexity?

Answer 4

Mesial

Question 5

Looking at the occlusal table of a maxillary 1st premolar, compare the angles at the MB and DB corners?
a. Which one is more acute?

Answer 5

MB > (angle) DB

a. DB = acute, MB = 90 degrees

Question 6

Which marginal ridge is longer on a maxillary 1st premolar?

Answer 6

Distal Marginal ridge (unique due that the Mesial marginal ridge is longer on most other teeth)

Question 7

From and occlusal view, where are the proximal contacts located, relative to the central groove?

Answer 7

Facial to the central groove

Question 8

Which maxillary premolar has the deeper central groove?

Answer 8

1st premolar

Question 9

From and occlusal view, where is the occlusal table of maxillary premolars located, relative to the root trunk?

Answer 9

Centered

Question 10

Which is the larger dimensions of maxillary premolars: FL or OC?

Answer 10

FL

Question 11

Of the four cusps of the maxillary 1st and 2nd premolars, which is the shortest?
a. Which is the largest?

Answer 11

Maxillary 1st Premolar lingual cusp

a. Maxillary 1st Premolar buccal cusp (Maxillary 1st premolar is larger than the 2nd)

Question 12

A developmental groove crosses over the mesial marginal ridge most frequently in which maxillary premolar?

Answer 12

Maxillary 1st premolar

Question 13

Where is the lingual HOC found on both the maxillary 1st and 2nd premolars?

Answer 13

Middle third

Question 14

What distinguishing feature found on the mesial surface differentiates between a maxillary 1st and 2nd premolar?

Answer 14

Mesial concavity on the maxillary 1st premolar

Question 15

From and occlusal view, which of the premolars are most symmetrical?

Answer 15

Maxillary 2nd premolar

Question 16

How do the lengths of the central grooves compare between the maxillary 1st and 2nd premolars?

Answer 16

1st > 2nd (Due to that the 1st premolar is larger overall than the 2nd)

Question 17

Which root surface of a maxillary 2nd premolar has a more pronounced depression?
a. Maxillary 1st premolar?

Answer 17

Distal

a. Mesial (due to concavity)

Question 18

From a lingual view, the lingual cusp of a maxillary premolar tends to lean towards which proximal surface?

Answer 18

Mesial (both 1st and 2nd)

Question 19

From a lingual view, the buccal cusp of the maxillary 1st premolar tends to lean towards which proximal surface?
a. Maxillary 2nd premolar buccal cusp?

Answer 19

Distal

a. More centered (slightly Mesial because the mesial buccal cusp ridge is shorter than distal buccal cusp ridge)

Question 20

Which of the maxillary premolars is larger?

Answer 20

Maxillary 1st premolar