Maxillary First Molar

Question 1

For the maxillary first molar, what is the expected age upon eruption?

Answer 1

6 years

Question 2

For ALL first and second molars, what is the crown shape as seen from the buccal view?

Answer 2

Trapezoid (shape of all molars)

Question 3

For ALL first and second molars, what is the shape of the mesial and distal outlines as seen from the facial and lingual views?

Answer 3

Mesial outline: convex

Distal outline: convex

Question 4

Are molars succedaneous teeth?

Answer 4

NO

Question 5

What are the heights of contour (occlusogingival contact location) of the mesial and distal surfaces of molars? What is the one exception?

Answer 5

Mesial: Junction of occlusal and middle 1/3s
Distal: Middle 1/3
One exception is the distal height of contour on the mandibular first molar. It is at the junction of the occlusal and middle 1/3s BUT it is still cervical relative to the mesial height of contour.

Question 6

For the maxillary first molar, of the two buccal cusps, MB and DB, which is taller and wider?

Answer 6

The MB cusp is slightly taller and wider than the DB cusp.

Question 7

For the maxillary first molar, what is the groove called on the buccal surface? How far onto the buccal surface does it extend? What is often found at the end?

Answer 7

The buccal groove is found on the buccal surface and extends all the way to the middle 1/3 of the buccal face, often ending in a deep pit.

Question 8

For all molars, are they longer M-D or O-G?

Answer 8

All molars are longer in the M-D dimension, meaning they are longer in the mesial-distal direction than they are tall.

Question 9

For the maxillary first molar, what lingual cusp is visible from the buccal view?

Answer 9

The ML cusp. The largest cusp on the tooth.

Question 10

What is the area where two roots split?

Answer 10

Furcation

Question 11

What is the distance from the CEJ to the furcation?

Answer 11

The ROOT TRUNK height

Question 12

What 5th, non-developmental root do we find on the lingual surface? What cusp is it found growing off of? Approximately what percentage of people have this ‘fifth’ cusp?

Answer 12

The cusp of carabelli grows off of the ML cusp in 70% of people.

Question 13

For the maxillary first molar, the MB and DB roots are quite spread out allowing visualization of the palatal root from the buccal view. What might be a contributing factor as to why they are so spread out?

Answer 13

The buccal furcation is located quite cervically (small root trunk) compared to the buccal furcation of the secondary max molar. This may give the MB and DB roots time to spread out into their classic seperation.

Question 14

For both maxillary molars, what is the crown shape as seen from the mesial view? What is the wider base as represented by the trapezoid?

Answer 14

Trapezoid. The wider base is the cervical base, which tapers to the occlusal surface.

Question 15

For both maxillary molar, what is the facial outline shape as seen from the mesial view?

Answer 15

Convex

Question 16

For the maxillary first molar, what is the buccal outline as seen from the mesial view?

Answer 16

Convex; variable due to cusp of carabelli

Question 17

For all molars, what are the heights of contour of the buccal and lingual surfaces as seen from the proximal view? What is the one possible exception?

Answer 17

Buccal: cervical 1/3
Lingual: middle 1/3
One exception is if the cusp of carabelli is present on the maxillary1st molar the height of contour on the lingual surface may be in the occlusal 1/3.

Question 18

For all molars, are the crowns longer in a buccal-lingual or cervical-occlusal direction?

Answer 18

All are wider in the B-L direction. Remember also wider M-D than O-C

Question 19

For the maxillary first molar, why is the DB root hidden from site from the mesial view?

Answer 19

Because the MB root is slightly taller and very wide in the L-B direction.

Question 20

For the maxillary first molar, which cusp is taller, MB or ML?

Answer 20

MB; ML cusp is the largest overall, however, slightly shorter than MB cusp

Question 21

For the maxillary first molar, what is said to be the shape of the palatal root as seen from a proximal view?

Answer 21

Banana shape b/c it flares to the lingual

Question 22

For the maxillary first molar, what is the crown shape as seen from the occlusal view?

Answer 22

Rhomboid or a parallelogram

Question 23

For the maxillary first molar, describe the facial and lingual outlines as seen from the occlusal view?

Answer 23

Buccal outline: Convex; MB cusp most prominent

Lingual outline: Convex; no taper to lingual; L usually wider M-D than B; may have cusp of carabelli

Question 24

For all maxillary molars, is the B-L or M-D dimension longer?

Answer 24

The B-L dimension is longer in maxillary mollars (especially on the mesial side).

Question 25

For the maxillary first molar, rank the size of the 5 cuspos of the maxillary first mollar.

Answer 25

ML>MB>DB>DL>cusp of carabelli

Question 26

For the maxillary first molar, what are the 5 grooves found on teh occlusal table?

Answer 26

Central, facial (buccal), Distolingual, lingual, Transverse groove of the oblique ridge

Question 27

For all molars, what are the 3 fossa present on the occlusal table?

Answer 27

Mesial, distal, and central