Maxillary Second Premolar

Question 1

For the maxillary second premolar, what is the age of expected eruption?

Answer 1

10-12 years

Question 2

For the maxillary second premolar, on the buccal and lingual faces is the occlusocervical crown dimension longer or shorter than the mesiodistal crown?

Answer 2

Longer. The buccal surface is taller than it is wide.

Question 3

For the maxillary second premolar, what is the crown shape from the facial and lingual views? How does it compare to the max 1st premolar?

Answer 3

Trapezoid or pentagon (more accurately describes the cusp tip). It is shorter, rounder cusp than 1st premolar.

Question 4

For the maxillary second premolar, which cusp ridge is longer, the distal or mesial?

Answer 4

Distal. This is the same as we saw with the canines but opposite to the max 1st premolar.

Question 5

For the maxillary second premolar, describe the mesial and distal outlines seen from the buccal/lingual view.

Answer 5

Mesial outline: Convex; mesial cusp is shorter than distal

Distal outline: Convex; distal cusp ridge longer than mesial

Question 6

For the maxillary second premolar, what are the heights of contour (occlusogingival contact locations) on the mesial and distal faces?

Answer 6

Mesial: Middle 1/3 just below junction with occlusal 1/3
Distal: middle 1/3 just inferior to mesial contact location

Question 7

For the maxillary second premolar, there is a cusp tip with M-D cusp ridges, connecting the three developmental lobes on the facial side, are there concave notches b/t these developmental lobes as often seen on the maxillary 1st premolar?

Answer 7

Sometimes (present on model teeth, especially on distal side).

Question 8

For the maxillary second premolar, how do the M-D and O-G distances of the lingual surface compare to those of the facial surface?

Answer 8

They are nearly the same. They are smaller but not by much. The crown of the maxillary second premolar tapers LITTLE to the lingual surface.

Question 9

For the maxillary second premolar, how many roots are present? Any dilaceration to either the mesial or distal?

Answer 9

There is only one maxillary 2nd premolar root. It curves towards the distal at the apex.

Question 10

For the maxillary second premolar, what is the crown shape from the occlusal view?

Answer 10

Oval or oblong

Question 11

For the maxillary second premolar, what is the shape of the occlusal table?

Answer 11

Oval

Question 12

For the maxillary second premolar, are the mesial and distal fossa relatively close or far away from the center of the occlusal table?

Answer 12

Close, b/c the transverse ridge is thinner than the transverse ridge of the max 1st premolar.

Question 13

For the maxillary second premolar, describe the facial and lingual outlines as seen from the occlusal view.

Answer 13

Both are convex. The facial middle lobe is prominent on the facial outline.

Question 14

For the maxillary second premolar, what two ridges meet to form the transverse ridge?

Answer 14

The two triangular ridges from the central facial and lingual cusps.

Question 15

For the maxillary second premolar, the presence of many supplemental grooves on the occlusal surface is said to give the occlusal surface what type of appearance?

Answer 15

A “wrinkled” appearence. As a general rule the more posterior you go the more supplemental occlusal grooves are present.

Question 16

For the maxillary second premolar, what is greater the B-L crown dimension or the M-D crown dimension?

Answer 16

The B-L. Max 2nd premolars are wider front to back (buccal-lingually) then side to side (mesio-distal). Same as max 1st premolar

Question 17

For the maxillary second premolar, the crown shows little (if any) taper to the lingual. What does this mean for the orientation of the mesial and distal marginal ridges?

Answer 17

They are (nearly) parallel.

Question 18

For the maxillary second premolar, compare the mesial and distal buccolingual contact locations.

Answer 18

Mesial: Buccal side of center
Distal: Buccal side of center but more lingual than the mesial contact point.

Question 19

For the maxillary second premolar, is the buccolingual crown dimension greater or less than the occlusocerviacal crown dimension?

Answer 19

Greater. The max 2nd premolar is wider front to back (buccolingually) than it is tall (occlusocervically). Also seen on max 1st premolar

Question 20

For the maxillary second premolar, what is the crown shape as seen from the mesial/distal (proximal) view?

Answer 20

Trapezoid. The occlusal surface is more narrow than the cervical width.

Question 21

Is the occlusal surface centered over the root trunk?

Answer 21

Yes. As it is in the max 1st premolar

Question 22

For the maxillary second premolar, describe the facial and lingual outlines as viewed from the proximal view

Answer 22

Facial outline: Convex

Lingual outline: Convex. Note: the lingual cusp is nearly as high as the lingual central cusp.

Question 23

For the maxillary second premolar, what are the heights of contour of the buccal and lingual faces?

Answer 23

Buccal: Cervical 1/3
Lingual: Middle 1/3
Same as max 1st premolar

Question 24

For the maxillary second premolar, what is the number of pulp canals present? What is the shape seen in cross section of the pulp chamber?

Answer 24

1 pulp canal. Sometimes can have 2.
Pulp chamber in cross section appears as oval. This differs from the max 1st premolar and is the same as the mandibular incisors and canines (canines are oval or figure 8).