Lab Mandibular Premolars Flashcards
% of 1 canals starting w Man1PM:
70%, 91%
% of 2 canals starting w Man1PM:
30%, 9%
Which has a longer avg length bw the man premolars?
the same, 22.5mm
Man1PM, % 1 canal at apex:
79%
Man1PM, % 2 canal at apex:
21%
of pulp horns the Man1st and 2nd premolars have:
2
Relative size of pulp horns of the Man1PM:
B: large, L: small
Shape of canal if w if 1 canal:
Oval –> Round
Shape of canal if w if 12canal:
round
Access shape for Man1PM:
Oval
Is there an inclination of the crown for Man1PM?
Yes, Lingual
Extend in this direction to get straight-line access for Man1PM:
to B cusp tip, little extension to L cusp
Center of access hole for Man1PM should be here:
Midway bw CG and B cusp tip
This type of canal has a 24% incidence rate, Man1pm(check)
Type 5 canal system (1-2)
What type of canal system is Type 5 system?
1-2
% incidence of Type 5 canal system in Man1PM:
24%
Which canal is easier to miss in Man1PM:
Lingual
What other tooth type often miss have a lingual canal that is easy to miss?
lower anteriors
How to find the lingual canal wall?
slide a small curved file up and down
Is it tougher to treat teeth that bifurcate more coronally or apically?
apically
this is considered to be one of the hardest teeth to treat:
Man1PM
Population more likely to have 2 canals:
African-American
% of African-Americans with 2 canals in the Man1PM
32.8%
% of caucasians with 2 canals in the Man1PM
13.7%
What does it mean if you are treating a Man1PM and you can not get to WL?
complex anatomy
% of Man2PM w 1 canal at apex:
92%
% of Man2PM w 2+ canals at apex:
8%
Canal shape of Man2PM:
oval
In which direction are the canals of the Man2PM wider?
bucolingually
Which has more variation, Man 1st or 2nd premolar?
1st
Where to gain access to the Man2PM:
dead center
Access shape of for the Man2PM:
oval
Which has more lingual inclination, Man1PM or Man2PM?
Man1PM
TF? Access shape for the Man2PM must be extended to the Buccal.
F.
Access canal entry in relation to the CG:
just B to the CG
This tooth hs a “snake eye” appearnace from the occlusal:
man1PM
Occlusal table shape of Man1PM
diamond shaped occlusal
of occlusal pits for Man1PM:
2
Common mistake in making access shape for premolars:
too wide MD
Which premolar has a ML developmental groove?
Man1PM
How many cusps does the Man12PM have?
2 or 3
3 cusp Man12PM is __ type.
Y
2 cusp Man12PM is __ type.
H or U
What does it mean when a canal disappears on RG?
canal splittling
`In whcih directions do the 2 canals typically branch?
B and L
What is dens evaginatus:
tooth outgrowth, folding of IEE into the stellate reticulum w the projection of structure exhibiting enamel, dentin and pulp
This is an outgrowth of enamel pulp tissue:
dens invaginatus
Pop’s most affected by dens invaginitus:
Asians, Eskimos, and Native American Indians
Affect of attrition due to dens invaginitus::
pulp exposed, contaminated by bac in the oral flora, puplipits, necrosis
How to determine if necrosis of a tooth is due to a connection to a sinus tract:
gutta percha point through tract
This can easily be mistaken for a lesion of endodontic origin:
mental foramen
Requirement for teeth to have a PA lesion:
tooth must be necrotic
This can easily be mistaken for a lesion of endodontic origin:
mental foramen
Requirement for teeth to have a PA lesion:
tooth must be necrotic
