Max. Molars

Question 1

The Max. molars have …… major cusps, while the Mand. have …….

Answer 1

three

four

Question 2

The buccal and lingual cusps on the Max. molars are …… in size

Answer 2

unequal (unlike the Mand. molars)

Question 3

Max. molars occlusal table is centered …….., unlike the Mand. molars which is …….

Answer 3

labiolingually

lingually inclined

Question 4

Occlusal view of the Max. molars show …… buccal and lingual surface, while the Mand. molars show ……

Answer 4

equal

more buccal

Question 5

Buccal pit is a feature of ……., while distolingual groove is a feature of ……

Answer 5

Mand. molars

Max. molars

Question 6

The Max. molars lingual height of contour is at …….. , while for the Mand. molars is at ……

Answer 6

junction of middle and cervical thirds

junction of middle and occlusal thirds

Question 7

Cusp of Carabelli is located at …….

Answer 7

mesiolingual cusp of Max. first molar

Question 8

The Max. first molar buccal surface is ……

Answer 8

convex at its lower third, then from the height of contour (which is at the lower third) to the cusp tip it is straight

Question 9

The Max. first molar lingual surface is …….

Answer 9

convex, with the height of contour on the lower middle third

Question 10

The Max. first molar mesiolingual cusp is separated from the distolingual cusp by …..

Answer 10

deep lingual groove, which is an extension of the distolingual groove

Question 11

The Max. first molar mesial contour is …….

Answer 11

concave at the middle third, then becomes convex

* The same goes for the distal contour

Question 12

The Max. first molar occlusal view shows …… outline

Answer 12

rhomboidal (with acute angles at the mesiobuccal and distolingual)

Question 13

The distobuccal cusp and the mesiolingual cusp are connected by ……

Answer 13

oblique ridge (forming a mesial triangle)
* Note that: the MB & ML cusps are the largest cusps. The DB cusp is larger than the DL cusp

Question 14

The Max. first molar mesial marginal ridge is ……..

Answer 14

more distinct than the distal

Question 15

The Max. first molar buccal roots are joined by …..

Answer 15

a root trunk (extends about 3 mm)

• A deep developmental groove extends between the buccal roots from the CEJ
• The distal curve of the mesial root tip & the mesial curve of the distal root tip gives the Plier appearance

Question 16

The Max. first molar palatal root is in line with the …..
The greatest diameter of the palatal root is …..
The palatal root has ……

Answer 16

lingual groove
mesiodistal dimension
a lingual groove on its lingual surface (extending from the CEJ)

Question 17

From the mesial view of the Max. first molar, only two roots can be seen. T/F??

Answer 17

true (the palatal and the mesiobuccal)

* Note that: both roots are shown extending beyond the crown contour

Question 18

The Max. second molar is the same as the first molar except for the following….

Answer 18

1. smaller
2. more occlusal developmental grooves
3. smaller distobuccal cusp
4. smaller distolingual cusp (or absent)
5. Mesiobuccal and distolingual angles are more acute, and the distobuccal & mesiolingual angles are more obtuse
6. The buccal roots are distally inclined. The palatal is straight or distally inclined. All roots within the crown profile

Question 19

Max. third molar crown shape is ………

Answer 19

triangular or heart shaped (due to absence of distolingual cusp)
* The distobuccal cusp is small or missing

Question 20

The roots of the Max. third molar are ….

Answer 20

short, distally inclined

* The roots might be fused