Lab Mandibular Premolars

Question 1

% of 1 canals starting w Man1PM:

Answer 1

70%, 91%

Question 2

% of 2 canals starting w Man1PM:

Answer 2

30%, 9%

Question 3

Which has a longer avg length bw the man premolars?

Answer 3

the same, 22.5mm

Question 4

Man1PM, % 1 canal at apex:

Answer 4

79%

Question 5

Man1PM, % 2 canal at apex:

Answer 5

21%

Question 6

of pulp horns the Man1st and 2nd premolars have:

Answer 6

2

Question 7

Relative size of pulp horns of the Man1PM:

Answer 7

B: large, L: small

Question 8

Shape of canal if w if 1 canal:

Answer 8

Oval –> Round

Question 9

Shape of canal if w if 12canal:

Answer 9

round

Question 10

Access shape for Man1PM:

Answer 10

Oval

Question 11

Is there an inclination of the crown for Man1PM?

Answer 11

Yes, Lingual

Question 12

Extend in this direction to get straight-line access for Man1PM:

Answer 12

to B cusp tip, little extension to L cusp

Question 13

Center of access hole for Man1PM should be here:

Answer 13

Midway bw CG and B cusp tip

Question 14

This type of canal has a 24% incidence rate, Man1pm(check)

Answer 14

Type 5 canal system (1-2)

Question 15

What type of canal system is Type 5 system?

Answer 15

1-2

Question 16

% incidence of Type 5 canal system in Man1PM:

Answer 16

24%

Question 17

Which canal is easier to miss in Man1PM:

Answer 17

Lingual

Question 18

What other tooth type often miss have a lingual canal that is easy to miss?

Answer 18

lower anteriors

Question 19

How to find the lingual canal wall?

Answer 19

slide a small curved file up and down

Question 20

Is it tougher to treat teeth that bifurcate more coronally or apically?

Answer 20

apically

Question 21

this is considered to be one of the hardest teeth to treat:

Answer 21

Man1PM

Question 22

Population more likely to have 2 canals:

Answer 22

African-American

Question 23

% of African-Americans with 2 canals in the Man1PM

Answer 23

32.8%

Question 24

% of caucasians with 2 canals in the Man1PM

Answer 24

13.7%

Question 25

What does it mean if you are treating a Man1PM and you can not get to WL?

Answer 25

complex anatomy

Question 26

% of Man2PM w 1 canal at apex:

Answer 26

92%

Question 27

% of Man2PM w 2+ canals at apex:

Answer 27

8%

Question 28

Canal shape of Man2PM:

Answer 28

oval

Question 29

In which direction are the canals of the Man2PM wider?

Answer 29

bucolingually

Question 30

Which has more variation, Man 1st or 2nd premolar?

Answer 30

1st

Question 31

Where to gain access to the Man2PM:

Answer 31

dead center

Question 32

Access shape of for the Man2PM:

Answer 32

oval

Question 33

Which has more lingual inclination, Man1PM or Man2PM?

Answer 33

Man1PM

Question 34

TF? Access shape for the Man2PM must be extended to the Buccal.

Answer 34

F.

Question 35

Access canal entry in relation to the CG:

Answer 35

just B to the CG

Question 36

This tooth hs a “snake eye” appearnace from the occlusal:

Answer 36

man1PM

Question 37

Occlusal table shape of Man1PM

Answer 37

diamond shaped occlusal

Question 38

of occlusal pits for Man1PM:

Answer 38

2

Question 39

Common mistake in making access shape for premolars:

Answer 39

too wide MD

Question 40

Which premolar has a ML developmental groove?

Answer 40

Man1PM

Question 41

How many cusps does the Man12PM have?

Answer 41

2 or 3

Question 42

3 cusp Man12PM is __ type.

Answer 42

Y

Question 43

2 cusp Man12PM is __ type.

Answer 43

H or U

Question 44

What does it mean when a canal disappears on RG?

Answer 44

canal splittling

Question 45

`In whcih directions do the 2 canals typically branch?

Answer 45

B and L

Question 46

What is dens evaginatus:

Answer 46

tooth outgrowth, folding of IEE into the stellate reticulum w the projection of structure exhibiting enamel, dentin and pulp

Question 47

This is an outgrowth of enamel pulp tissue:

Answer 47

dens invaginatus

Question 48

Pop’s most affected by dens invaginitus:

Answer 48

Asians, Eskimos, and Native American Indians

Question 49

Affect of attrition due to dens invaginitus::

Answer 49

pulp exposed, contaminated by bac in the oral flora, puplipits, necrosis

Question 50

How to determine if necrosis of a tooth is due to a connection to a sinus tract:

Answer 50

gutta percha point through tract

Question 51

This can easily be mistaken for a lesion of endodontic origin:

Answer 51

mental foramen

Question 52

Requirement for teeth to have a PA lesion:

Answer 52

tooth must be necrotic

Question 53

This can easily be mistaken for a lesion of endodontic origin:

Answer 53

mental foramen

Question 54

Requirement for teeth to have a PA lesion:

Answer 54

tooth must be necrotic