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

Does the mandibular 2nd molars have a prominent facial ridge on the mesiobuccal cusp

Answer 5

Yes

Question 6

What are the tooth numbers for mandibular 2nd molars?

Answer 6

18, #31

Question 7

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

Answer 7

Nearly straight

Question 8

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

Answer 8

Convex

Question 9

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

Answer 9

1

Question 10

Where is the mesialcontact areas of mandibular 2nd molars located?

Answer 10

Junction of the occlusal and middle thirds

Question 11

Where is the distal contact areas of mandibular 2nd molars located?

Answer 11

middle third

Question 12

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

Answer 12

Sharper

Question 13

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

Answer 13

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

Question 14

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

Answer 14

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

Question 15

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

Answer 15

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

Question 16

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

Answer 16

• Closer together
• Smaller
• Shorter
• Shallower depression

Question 17

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

Answer 17

Only the MB root

Question 18

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

Answer 18

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

Question 19

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

Answer 19

Less pronounced

Question 20

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

Answer 20

Rectangular

Question 21

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

Answer 21

MD is larger than BL

Question 22

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

Answer 22

Four equal cusps:

• MB
• DB
• ML
• DL

Question 23

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

Answer 23

4

Question 24

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

Answer 24

Transverse ridges

Question 25

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

Answer 25

Central fossa/pit (largest) Mesial triangular fossa/pit Distal triangular fossa/pit

Question 26

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

Answer 26

“+” pattern

Question 27

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

Answer 27

Yes

Question 28

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

Answer 28

Yes

Question 29

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

Answer 29

They have more supplemental grooves