Mandibular 2nd molar arch traits

Question 1

at what age do they erupt?

Answer 1

11-13 years

Question 2

at what age is the root completed?

Answer 2

14-15 years

Question 3

what creates equal sized cusps?

Answer 3

the groove

Question 4

root trunk length compared to 1st molar

Answer 4

is longer than the 1st molar

Question 5

contacts from the lingual view

Answer 5

mesial: junction of occlusal and middle 1/3
distal: junction of occlusal and middle 1/3

Question 6

are the cusps the same size from the lingual view?

Answer 6

yes

Question 7

proximal surfaces compared to the 1st molar

Answer 7

they exhibit less convergence

Question 8

what are the height of contours from the mesial view

Answer 8

buccal: cervical 1/3
lingual: middle 1/3

Question 9

what is visible from the distal view?

Answer 9

the occlusal table because the DMR<MMR

Question 10

how many cusps and what are they from the occlusal view?

Answer 10

MB, ML, DB, DL

Question 11

is the buccal or lingual surface more visible from the occlusal view?

Answer 11

more buccal surface

Question 12

What shape do the grooves make?

Answer 12

a + sign and it is the only tooth to do this