mandibular 2nd molars

Question 1

When do mandibular 2nd molars erupt?

Answer 1

11–12 years

Question 2

When is root completion for mandibular 2nd molars?

Answer 2

14–15 years

Question 3

How do the crown dimensions of mandibular 2nd molars compare to mandibular 1st molars?

Answer 3

The crown dimensions are smaller than those of the 1st molars

Question 4

How many cusps do mandibular 2nd molars have?

Answer 4

Four

Question 5

What are the tooth numbers for mandibular 2nd molars?

Answer 5

18, #31

Question 6

What is the mesial outline shape of mandibular 2nd molars from the buccal view?

Answer 6

Nearly straight

Question 7

What is the shape of the distal outline of mandibular 2nd molars from the buccal view?

Answer 7

Convex

Question 8

How many developmental buccal grooves are on mandibular 2nd molars?

Answer 8

1

Question 9

Where are the mesial and distal contact areas of mandibular 2nd molars located?

Answer 9

Junction of the occlusal and middle thirds

Question 10

Which contact area of mandibular 2nd molars iz more cervically located?

Answer 10

Distal contact

Question 11

How do the cusp tips of mandibular 2nd molars compare to those of the 1st molars from the lingual view?

Answer 11

Sharper

Question 12

How do the buccal and lingual surfaces of mandibular 2nd molars compare in width?

Answer 12

They are more equal in width compared to the 1st mandibular molar

Question 13

How do the roots of mandibular 2nd molars compare to those of the 1st molars?

Answer 13

The roots are straighter than those of the 1st molar.

Question 14

How do the roots of mandibular 2nd molars differ from those of the 1st molar?

Answer 14

They have more variations, with 2–3 root canals.

Question 15

What are the characteristics of the roots of mandibular 2nd molars?

Answer 15

• Closer together
• Smaller
• Shorter
• Shallower depression

Question 16

From the mesial view of mandibular 2nd molars, which root is visible?

Answer 16

Only the MB root

Question 17

How does the MB root of mandibular 2nd molars compare to that of the 1st molar?

Answer 17

The MB root is not as broad as the 1st molar

Question 18

How does the CEJ of mandibular 2nd molars compare to the 1st molars?

Answer 18

Less pronounced

Question 19

What shape does the mandibular 2nd molar resemble from the occlusal view?

Answer 19

Rectangular

Question 20

How do the mesiodistal (MD) and buccolingual (BL) dimensions compare in mandibular 2nd molars?

Answer 20

MD is larger than BL

Question 21

How many equal cusps are present on the mandibular 2nd molar, and what are they?

Answer 21

Four equal cusps:

• MB
• DB
• ML
• DL

Question 22

How many triangular ridges are present on the mandibular 2nd molar?

Answer 22

4

Question 23

What other type of ridges can be seen on mandibular 2nd molars?

Answer 23

Transverse ridges

Question 24

What are the three fossae present on mandibular 2nd molars?

Answer 24

Central fossa/pit
Mesial triangular fossa/pit
Distal triangular fossa/pit

Question 25

What is the characteristic pattern of grooves on mandibular 2nd molars?

Answer 25

“+” pattern

Question 26

Is the central groove on mandibular 2nd molars well defined?

Answer 26

Yes

Question 27

Do the buccal and lingual grooves cross the central groove on mandibular 2nd molars?

Answer 27

Yes

Question 28

What is a characteristic feature of mandibular 2nd molars in terms of grooves?

Answer 28

They have more supplemental grooves