Maxillary 1st Pre-molar Arch Traits

Question 1

At what age do they erupt?

Answer 1

10-11 years

Question 2

At what age is the root completed?

Answer 2

12-13 years

Question 3

Which cusp is bigger and by how much?

Answer 3

Buccal > Lingual by 1 mm

Question 4

How many roots?

Answer 4

2 and bifurcation level varies

Question 5

Function of these teeth?

Answer 5

grinding

Question 6

What are the most common extraction for?

Answer 6

orthodontics

Question 7

From the buccal view what are the mesial and distal contacts?

Answer 7

Both are in the middle 1/3 but the distal contact is more occlusal than mesial

Question 8

Which cusp ridge is bigger?

Answer 8

MCR>DCR

Question 9

CEJ shape from buccal view

Answer 9

slight curve

Question 10

Which way do the roots incline?

Answer 10

lingual root inclines distally

buccal root inclines lingually

Question 11

Crow tapers in which direction from the lingual view?

Answer 11

towards lingual

Question 12

CEJ shape from lingual view

Answer 12

nearly straight

Question 13

What space is ideal for calculus formation?

Answer 13

Mesial Proximal concavity

Question 14

from the mesial view which cusp is bigger?

Answer 14

B>L

Question 15

CEJ shape from distal view

Answer 15

straight line

Question 16

Height of contour from Distal view

Answer 16

Buccal: Cervical 1/3
Lingual: Middle 1/3

Question 17

Is the central developmental groove longer than the second pre-molar?

Answer 17

yes