Mand. Molars

Question 1

The Mand. first molar features ….. cusps

Answer 1

five (three buccal and two lingual)

* The largest is the MB, then the DB, and the smallest is the distal

Question 2

The Mand. first molar buccal surface shows two grooves, ……. & …….

Answer 2

1. MB groove: separates the MB cusp from the DB cusp. Ends in the buccal pit
2. DB groove: separates the DB cusp from the distal cusp

Question 3

The Mand. first molar buccal height of contour is at …….

Answer 3

cervical third (called the buccal cervical ridge)
* The buccal surface above the ridge is relatively flat

Question 4

The Mand. first molar mesial surface is ……., while the distal is …….

Answer 4

concave at the cervical third, convex at the upper two thirds
* convex throughout

Question 5

The Mand. first molar buccal crown profile can be seen from the lingual because …….

Answer 5

the buccal surface is wider than the lingual

* Note that: the mesial surface is also wider than the distal surface

Question 6

The Mand. first molar lingual groove separates ……..

Answer 6

the two equally sized lingual cusps

Question 7

The Mand. first molar lingual height of contour is ……

Answer 7

high at the middle third

* The lingual surface is convex in the upper two thirds and flat in the lower third

Question 8

The Mand. first molar occlusal view shows …..

Answer 8

1. the mesial (large) & distal (small) marginal ridges cut by developmental grooves
2. Most of the buccal surface can be seen in the occlusal view
3. Crown profile is pentagonal
4. three fossae: central, mesial and distal

Question 9

The Mand. first molar central fossa features …..

Answer 9

a central pit, from which the MB groove and the lingual groove extend. A central groove runs through to end in the mesial and distal pit
* The DB groove originate from the central groove distally to the central pit

Question 10

The broadest root in the lower arch is …….

Answer 10

the mesial root of the first molar

• broadest in buccolingual dimension
• features a distinct proximal root concavity
• The distal root is smaller and may also have a proximal concavity
• Note that: the root apices are rounded

Question 11

The Mand. second molar has ….. cusps

Answer 11

four

Question 12

The Mand. second molar is similar to the first molar except for ……..

Answer 12

1. smaller
2. no distal cusp
3. buccal and lingual surfaces are equal in length, so is the mesial and distal
4. one buccal groove

Question 13

The Mand. second molar occlusal view features:

Answer 13

1. rectangular outline
2. central fossa, with central pit, central groove, and lingual & buccal grooves
3. mesial and distal triangular fossae
4. no developmental grooves across the marginal ridges

Question 14

The roots of the Mand. second molar is similar to the first molar except:

Answer 14

more distally inclined, closer together, pointed root apex, and no proximal root concavities
* Note that: the roots of the third molar is even more distally inclined

Question 15

The Mand. third molar occlusal view shows …… occlusal table

Answer 15

ovoid

* Usually, have 4 cusps