10 - Pulp Anatomy Flashcards
what is important to know in general dental anatomy to determine pulp anatomy (“textbook knowledge”
- number of roots
- number of canals
- longitudinal and cross sectional shapes
- curves
what is a two dimensional view of a three dimensional object
radiographic evidenec
are canal aberrations visible in radiographs
NO
are radiographs from different angles recommended?
YES
if you dont have a CBCT, what should you do for radiographic evidence
do radiographs from different angles
what do you explore in root canal anatomy? how?
explore: access prep and search for canals
thru magnification and illumination
the shape of the pulp system reflects what
surface outline of crown and root
what can different cross section of root and canal anatomy look like
- round
- oval
- figure 8 or ribbon shaped
- c shaped
T/F: different shapes may appear at different levels in the same root
TRUE
T/F: assume you have the MINIMUM of canals until proved otherwise
FALSE! assume MAXIMUM
what cause alterations in internal anatomy
- age
- irritants
- calcifications
- resorption
what shape canal
figure 8
how does age alter internal anatomy
In molars the roof and floor of chamber show more dentin formation with age,
resulting in a disc-like shape of the chamber
how do irritants alter internal anatomy
Irregular dentin formation tend to occur directly under the involved tubules
what are the components of the pulp system
- Pulp Horns
- Pulp Chamber
- Root Canals
- Accessory Canals
- Apical Foramen
A
lateral canal
B
apical foramen
A
pulp chamber
B
pulp horn
C
root canal
A
canal orifices
B
developmental grooves
is this tooth vital or necrotic
necrotic! super dry
what is funnel shape from canal orifice to apical foramen
root canals
T/F: most canals are STRAIGHT
FALSE! curved
where do most curves of root canal occur
in faciolingual direction (important in xrays)
T/F: shape and size of root canals are variable
TRUE
where is the chamber occupy
center of crown
what do the canals occupy
center of root
T/F: there are curves you cannot see in conventional radiographs
TRUE
If a root appears wide in radiograph, there is a good chance of what?
that there are two canals
what are canal aberrations
- isthmuses
- cul-de-sacs
-fins
where are accessory canals frequent
apical third
accessory canals can lead to what
lateral lesions
where can microbes gain entry into the pulp
thru lateral canals
what connect the floor of pulp chamber with furcation in posterior teeth
furcal canals
what can lead to furcation destruction (furcation lesion)
furcal canals
furcal canals are lesions of what origin?
endo origin
do furcal canals heal after endo therapy
YES
how may Weine’s canal classifications are there
Type I->IV
what weine’s canal classification
I
what weine’s canal classification
II
what weine’s canal classification
III
what weine’s canal classification
IV
individual tooth anatomy can very according to what?
according to different studies and among different race groups
describe maxillary central incisor
of canals, curvature, percent of 2 canals
one canal
usually straight
two canals less than 0.5%
describe maxillary lateral incisor
of canals, curvature, percent of 2 canals
one canal
curvature in apical third
two canals less than 0.5%
describe maxillary cuspid
One canal
Wide in bucco-lingual dimension
Apical curve
Two canals never been reported
what type is the hardest one to treat
Type IV
over 90% of maxillary 1st bicuspid have how many canals?
2 canals
what percent of maxillary first bicuspid have three canals
3-6%
maxillary second bicuspid has 53% ___ canal. the other half has hoe many canals
53% = 1 canal
46% = 2 canals
1% = 3 canals
how many roots does maxillary 1st molar usually have? how many canals?
almost always has three roots, four canals
what are the names of the canal of maxillary first molar
MB canal, MB2 canal, DB canal P canal
MB2 always present but sometimes cannot find it
what is the 4th canal called in max 1st molar? where?
Fourth canal is called mesio-lingual canal or MB2 and is located in the mesio-buccal root, lingual
lingual of maxillary first molar is what type canal
type II
what is most likely amount of roots in max second molar
3 roots = 60%
4 canals = 30% (when present it is located in M-B root)
2 roots = 25%
1 root = 10%
when present in max second molar, where is the 4th canal present
mesio-buccal root
describe canals of mand central
70% one canal
30% two canals
describe canals of mand laterals
55% one canal
45% two canals
are second canals common in mandibular incisors?
YES!
how many canals in mandibular canine and percents
70% - one canal
30% - two canals
when only one canal present in mandibular canine, it is very wide where
bucco-lingually
how many canals and percent in mandibular first bicuspid
70% one canal
29% two canal
T/F: any mandibular tooth is capable of having more than one canal
TRUE
how many canal and percent of mandibular second bicuspid
85% - one canal
12% - two canals
3% - two foramina
how many canals/foramina in mandibular first molar MESIAL root
Two canals/two foramina 60%
Two canals/one foramina 40%
how many canals/foramina in mandibualr first molar DISTAL root
One canal 70%
Two canals one foramen 20%
Two canals two foramina 10%
how many canals/foramina in mandibular second molar MESIAL root
Two canals / two foramina 40%
Two canals / one foramina 35%
One canal 25%
how many canals/foramina in mandibular second molar DISTAL root
One canal 92%
Two canals / one foramina 5%
two canals / two foramina 3%
mandibular second molars have what shaped canals
C shaped
T/F: Weine’s classification is per tooth not by root?
FALSE! it is per ROOT not by tooth
T/F: When two canals are present you need to add up the different types
that have two canals to come up with a total number
TRUE
how do you determine the total number of canals in a tooth
count all canals in each root and then add them all up
what CBCT view
coronal view
what CBCT view
sagital view
what CBCT view
axial view
A 4th canal is usually present on maxillary molars. Which of the following roots of
maxillary molars contain 2 canals?
mesiobuccal root
T/F: accessory canals are more frequent on the middle third of the root
FALSE! apical third!
approximately what pecentage of maxillary 1st premolars have two canals
over 90%
T/F: the shape of the canal is uniform al throughout the length of the canal
FALSE
T/F: it is impossible to instrument the entire root canal system
TRUE
T/F: canals are straight in most teeht
FALSE
T/F: one of the limitations of radiographs is that it is two dimensional view of a three dimensional object
TRUE
T/F: furcation lesions can occur due to the presence of furcal canals
TRUE
T/F: as the patient ages the pulp chamber tends to get smaller
TRUE
