Lab Mandibular Premolars Flashcards

1
Q

% of 1 canals starting w Man1PM:

A

70%, 91%

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2
Q

% of 2 canals starting w Man1PM:

A

30%, 9%

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3
Q

Which has a longer avg length bw the man premolars?

A

the same, 22.5mm

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4
Q

Man1PM, % 1 canal at apex:

A

79%

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5
Q

Man1PM, % 2 canal at apex:

A

21%

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6
Q

of pulp horns the Man1st and 2nd premolars have:

A

2

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7
Q

Relative size of pulp horns of the Man1PM:

A

B: large, L: small

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8
Q

Shape of canal if w if 1 canal:

A

Oval –> Round

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9
Q

Shape of canal if w if 12canal:

A

round

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10
Q

Access shape for Man1PM:

A

Oval

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11
Q

Is there an inclination of the crown for Man1PM?

A

Yes, Lingual

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12
Q

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

A

to B cusp tip, little extension to L cusp

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13
Q

Center of access hole for Man1PM should be here:

A

Midway bw CG and B cusp tip

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14
Q

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

A

Type 5 canal system (1-2)

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15
Q

What type of canal system is Type 5 system?

A

1-2

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16
Q

% incidence of Type 5 canal system in Man1PM:

A

24%

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17
Q

Which canal is easier to miss in Man1PM:

A

Lingual

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18
Q

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

A

lower anteriors

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19
Q

How to find the lingual canal wall?

A

slide a small curved file up and down

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20
Q

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

A

apically

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21
Q

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

A

Man1PM

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22
Q

Population more likely to have 2 canals:

A

African-American

23
Q

% of African-Americans with 2 canals in the Man1PM

24
Q

% of caucasians with 2 canals in the Man1PM

25
What does it mean if you are treating a Man1PM and you can not get to WL?
complex anatomy
26
% of Man2PM w 1 canal at apex:
92%
27
% of Man2PM w 2+ canals at apex:
8%
28
Canal shape of Man2PM:
oval
29
In which direction are the canals of the Man2PM wider?
bucolingually
30
Which has more variation, Man 1st or 2nd premolar?
1st
31
Where to gain access to the Man2PM:
dead center
32
Access shape of for the Man2PM:
oval
33
Which has more lingual inclination, Man1PM or Man2PM?
Man1PM
34
TF? Access shape for the Man2PM must be extended to the Buccal.
F.
35
Access canal entry in relation to the CG:
just B to the CG
36
This tooth hs a "snake eye" appearnace from the occlusal:
man1PM
37
Occlusal table shape of Man1PM
diamond shaped occlusal
38
of occlusal pits for Man1PM:
2
39
Common mistake in making access shape for premolars:
too wide MD
40
Which premolar has a ML developmental groove?
Man1PM
41
How many cusps does the Man12PM have?
2 or 3
42
3 cusp Man12PM is __ type.
Y
43
2 cusp Man12PM is __ type.
H or U
44
What does it mean when a canal disappears on RG?
canal splittling
45
`In whcih directions do the 2 canals typically branch?
B and L
46
What is dens evaginatus:
tooth outgrowth, folding of IEE into the stellate reticulum w the projection of structure exhibiting enamel, dentin and pulp
47
This is an outgrowth of enamel pulp tissue:
dens invaginatus
48
Pop's most affected by dens invaginitus:
Asians, Eskimos, and Native American Indians
49
Affect of attrition due to dens invaginitus::
pulp exposed, contaminated by bac in the oral flora, puplipits, necrosis
50
How to determine if necrosis of a tooth is due to a connection to a sinus tract:
gutta percha point through tract
51
This can easily be mistaken for a lesion of endodontic origin:
mental foramen
52
Requirement for teeth to have a PA lesion:
tooth must be necrotic
53
This can easily be mistaken for a lesion of endodontic origin:
mental foramen
54
Requirement for teeth to have a PA lesion:
tooth must be necrotic