After Midterm: Lab Mandibular Molars

Question 1

Man1M # of roots:

Answer 1

2, sometimes 3

Question 2

Man1M, # of canals:

Answer 2

3-4, sometimes 5+

Question 3

Crown length and avg length, Man1M:

Answer 3

7.5mm, 14mm

Question 4

Most Man1M have how many roots?

Answer 4

2

Question 5

TF? If there are 2 roots on the Man1M they most often join.

Answer 5

T

Question 6

If the Man1M has more than 2 canals, which root is more likely to have 2?

Answer 6

mesial

Question 7

If there are 2 or more canals at apex, which root is more likely to have multiple?

Answer 7

M root

Question 8

If there are 2 or more canals in a root, which root is more likely to have multiple?

Answer 8

M root

Question 9

If there is one canal at the apex, which root is more likely to have 1?

Answer 9

D root

Question 10

If there are 2 or more canals at the apex, which root is more likely to have multiple?

Answer 10

M root

Question 11

Which root is more likely to be distal and straight?

Answer 11

M

Question 12

Which canal is more likely to be straight and distal?

Answer 12

D

Question 13

% of M roots of the Man1M that have 2 canals:

Answer 13

71%, 1: 12%, 3: 1%

Question 14

% of D roots of the Man1M that have 2 canals:

Answer 14

30%, 1: 70%

Question 15

Canal types and %’s when 2 M canals are present:

Answer 15

Type IV: 60%, Type II: 40%

Question 16

Canal types and %’s when 2 D canals are present:

Answer 16

Type IV: 40%, Type II: 60%

Question 17

when M root has 3 canals, the 3rd root is called:

Answer 17

Middle Mesial Canal

Question 18

Location of the Middle Mesial Canal:

Answer 18

bw MB and ML canals in the isthmus

Question 19

Incidence of Middle Mesial Canals in the Man1M:

Answer 19

1-15% up to 45%?

Question 20

Pop that more frequently have Middle Mesial Canals:

Answer 20

younger pts

Question 21

TF? canals don’t mean that they were joined before C and S.

Answer 21

T

Question 22

Is the furcation wall thin or thick bw MB and ML canals?

Answer 22

Thin

Question 23

3rd root is more common in which population?

Answer 23

Asian

Question 24

Types of 3rd roots:

Answer 24

radix paramolars and radix entomolaris

Question 25

Where is the 3rd root w radix paramolars?

Answer 25

B

Question 26

Which is more common, radix paramolaris or radix entomolaris?

Answer 26

entomolaris

Question 27

Where is the 3rd root in radix entomolars?

Answer 27

on the L

Question 28

In which root are instruments most frequently broken?

Answer 28

M root

Question 29

Wider portion of the trapezoid access should face:

Answer 29

the M

Question 30

Center of teh access form of the Man1M should be:

Answer 30

centered on the M 2/3's of the crown

Question 31

Which canal is usually under the MB cusp tip?

Answer 31

MB canal

Question 32

The mesial wall of the access should approach:

Answer 32

the mesial pit

Question 33

Where is the distal canal if only 1?

Answer 33

centered bw both mesials

Question 34

Where is the distal canal if 3?

Answer 34

offset to the B or L

Question 35

The B canal is broad in this direction:

Answer 35

B-L

Question 36

What is the Law of Symmetrty?

Answer 36

except for max molars, canal orifices are equidistnat rom a line drawn in a MD direction thru center of the pulp floor

Question 37

Which tooth does the Law of symmetry not apply to?

Answer 37

Max molars

Question 38

Man2M, erupton time:

Answer 38

12y

Question 39

man1M eruption time:

Answer 39

6y

Question 40

Man2M, crown lenth and avg lentgth:

Answer 40

7mm, 20mm

Question 41

of roots, Man2M:

Answer 41

1-3

Question 42

of canals, Man2M::

Answer 42

2-4 (2 least freq)

Question 43

Which root is more likely to have one canal for the Man2M:?

Answer 43

D

Question 44

Which root is more likely to have 2+ canals for the Man2M:?

Answer 44

M

Question 45

Which root is more likely to have 1 canal at apex for the Man2M:?

Answer 45

M

Question 46

Which root is more likely to have 2+ canals at apex for the Man2M:?

Answer 46

M

Question 47

Which Man2M root is more often distal and straight?

Answer 47

M

Question 48

Which Man2M root is more often straight and distal?

Answer 48

D

Question 49

% of M roots w 2 canals for Man2M:

Answer 49

73%

Question 50

% of D roots with 2 canals, Man2M:

Answer 50

7%

Question 51

% of M roots w 1 canal, Man2M:

Answer 51

27%

Question 52

% of D roots w 1 canal for the Man2M:

Answer 52

92%

Question 53

Incidence of C shaped canals, Man2M:

Answer 53

8%

Question 54

Classification types of C shaped canaled Man2M:

Answer 54

Type -4

Question 55

Type i:

Answer 55

C

Question 56

Type II:

Answer 56

Semicolon

Question 57

Type III:

Answer 57

2 or 3 separate canals

Question 58

Type I:

Answer 58

no discernible canal

Question 59

Semlcolon is what canal type:

Answer 59

II

Question 60

2 or 3 separate canals, canal type:

Answer 60

III

Question 61

no discernible canal, canal type:

Answer 61

IV

Question 62

Canal type w obviously separated canals:

Answer 62

III

Question 63

Canal type that looks like a C from the occlusal:

Answer 63

I

Question 64

Smaller semicolon canal type:

Answer 64

II

Question 65

Larger semicolon, canal type:

Answer 65

III

Question 66

How is the access shape different for the Man1M from the Man2M:

Answer 66

their not

Question 67

Access shape for Man2M:

Answer 67

trapezoid

Question 68

Where should the access shape of the Man2M be centered?

Answer 68

mesial 2/3

Question 69

Which canal is typically under the MB cusp tip of the Man2M?

Answer 69

MB canal

Question 70

[Mesial wall of access ofr the Man2M should approach:

Answer 70

mesial pit

Question 71

Eruption time of Man3M:

Answer 71

17-21

Question 72

This is the most variable tooth in the mouth:

Answer 72

Man3M

Question 73

The Man3M typically has this number of cusps and roots:

Answer 73

5 cusps, 2 roots

Question 74

What will happen if you don' tget straight line access for the Man3M:

Answer 74

you will file toward the furcation

Question 75

How to determine the reference point for each canal:

Answer 75

name of the canal should match the cups tip

Question 76

TF? There are dentinal triangles in the Man3M.

Answer 76

T

Question 77

TF? Always file toward the furcation.

Answer 77

F

Question 78

File toward this in the MB canal:

Answer 78

MB line angle

Question 79

File toward this in the ML canal:

Answer 79

ML line angle