Pulp Morphology Handout

Which tooth has one root, conical and straight with one canal with a blunt apex?

maxillary central incisor

What is the shape of the cervical cross-section of a maxillary central incisor?

rounded triangular outline

Which tooth is the only one in the mouth with a root wider mesiodistally than facio-lingually?

maxillary central incisor

What is the shape of the cervical cross-section of PULP for maxillary central incisors?

triangular

Maxillary central incisors have ______ canal(s) 100% of the time

1

Maxillary central incisors usually have ____ pulp horns maybe ____ (prominent M and D pulp horns)

2, 3

Root canal properties for which tooth?

Wide mesiodistally

Narrow labiolingually

Greatest axial inclination (Almost Vertical MB)

Maxillary central incisor

Which tooth has one root, pointed apex deflects to the distal?

maxillary lateral incisor

What is the shape of the cervical cross-section of a maxillary lateral incisor?

ovoid (slightly flattened MD)

Maxillary lateral incisors have ______ canal(s) almost 100% of the time

1

Which tooth?
Two small pulp horn
Canal wider labiolingually than mesiodistally

maxillary lateral incisor

What is the shape of the cervical cross-section of PULP for maxillary lateral incisors?

oval

Which tooth has the longest root and is the longest tooth (crown & root length combined) in the mouth?

maxillary canine

Which tooth?
One root
May have distal apical curvature
Wider labiolingually than mesiodistally

maxillary canine

What is the shape of the cervical cross-section of a maxillary canine?

ovoid (flattened M and D surfaces)

Maxillary canines have ______ canal(s) 100% of the time

1

Which tooth has the widest pulp canal labiolingually of any other tooth?

maxillary canine

Which tooth has a root canal with:
One pointed pulp horn
Narrower mesiodistally than labiolingually

maxillary canine

Maxillary first premolars have how many roots?

2 (1 buccal, 1 lingual)

Maxillary first premolar roots bifurcate ___ root length

1/2

Which tooth?
-Deep concavity on mesial of root
-Roots nearly equal in length (buccal is slightly longer)

maxillary 1st premolar

What is the shape of the cervical cross-section of a maxillary 1st PM?

kidney/figure 8/hourglass

On a maxillary 1st PM, which surface has a coronal and radicular groove/depression - creating a high

perforation zone during endodontic treatment??

mesial

For a maxillary 1st premolar, what % has 2 canals? What are they?

90%, B and L

For a maxillary 1st premolar, what % has 3 canals? What are they?

6%
MB, DB, P

For a maxillary 1st premolar, what % has 1 canal?

4%

Which tooth has root canals with these properties?
Two pulp horns (B and L)
Extremely broad bucco-lingually.
Much narrower mesiodistally

maxillary 1st premolar

Which tooth?
Usually, one root
Blunt Apex
Wider Buccolingually than mesiodistally

maxillary 2nd premolar

What is the shape of the cervical cross-section of a maxillary 2nd PM?

flattened oval

Maxillary 2nd premolars have 1 canal what % of the time?

60%

Maxillary 2nd premolars have 2 canals what % of the time? What are they called?

40%, B and L

Which tooth has these root canal properties?
Two pulp horns
Very broad buccolingually
Very narrow mesiodistally

maxillary 2nd premolar

Which tooth is the most complex tooth in the mouth (in relation to roots) ?

maxillary 1st molar

What are the 3 roots of the maxillary 1st molar?

palatal (lingual), MB, DB

Which root of maxillary first molar?
Longest, biggest of the three toots
Only root in mouth with concavities on its buccal and lingual surfaces

P (L)

Which root of maxillary first molar?
Flattest and widest root
Often two canals
second largest root of tooth

MB

Which root of maxillary first molar?
Smallest and Shortest of the three roots

DB

Which tooth?
Wide root trunk
Trifurcation
Large pulp chamber

maxillary 1st molar

Maxillary 1st molars usually have __ root canals and __ pulp horns

4, 5

What % of the time do maxillary 1st molars have 3 root canals?

45%

What % of the time do maxillary 1st molars have 4 root canals?

55% (1 canal 100% in palatal, 1 canal DB, 2 canals MB)

When a maxillary 1st molar has 4 canals, what root has 2 canals?

MB

How often does the MB canal bifurcate in maxillary 1st molars?

65-75%

How often does the DB canal bifurcate in maxillary 1st molars?

5%

Which root canal is the largest/biggest in the maxillary 1st molar?

P/L

Which shape are the canal orifices below the CEJ for 4 canals?

rhomboidal

Which shape are the canal orifices below the CEJ for 3 canals?

triangular

How many roots do maxillary 2nd molars have? What are they?

3: palatal, MB, DB

Which tooth?
Roots may be fused
Roots incline distally
Trifurcation
Wide root trunk

maxillary 2nd molar

Maxillary 2nd molars usually have 3 root canals _____% of the time

60

Maxillary 2nd molars usually have 4 root canals _____% of the time

20-40 (MB root has 4th canal usually, DB never)

Maxillary 2nd molars usually have ___ pulp horns

3/4

What is the shape of the pulp chamber for maxillary second molars?

rhomboidal

In the maxillary 2nd molar, the orifices are found ___________ to the cervical line

Apical

Which tooth?

Roots:

- Three roots, palatal/ lingual, distobuccal, mesiobuccal

- Very variable in size, shape, and number

Root Canals:

- Usually three root canals, three or four pulp horns

- Varies according to tooth shape. Root often fused.

maxillary 3rd molar

Which teeth have these root properties?
Usually, one straight and flat root
Root much wider labiolingually and narrower mesiodistally
Root concavities on mesial and distal surfaces

mandibular central and lateral incisor

What is the cross-sectional shape of mandibular central incisors?

flat rectangle with rounded corners

______ incisor root is slightly longer and thicker than the _______ incisor

mandibular lateral (longer/thicker), mandibular central

Mandibular central incisors have one root canal _____% of the time

60

Mandibular central incisors have two root canals _____% of the time

40

Which teeth have these root canal properties?
Two small pulp horns (disappear with age)
Canals are narrow mesiodistal and wider faciolingually

mandibular central and lateral incisors

Does mandibular central or lateral root canal bifurcate more often?

lateral

What is the cross-sectional shape of mandibular lateral incisors?

flat rectangle with rounded corners

Mandibular lateral incisors have one root canal _____% of the time

55

Mandibular lateral incisors have two root canals _____% of the time

45%

Which tooth has one root that may bifurcate and has the second longest root in the mouth?

mandibular canine

Which tooth has these root properties?
Wider labiolingually and narrow mesiodistally
Root concavities may be present.
The apex will tend to deviate mesially

mandibular canine

What is the cervical cross-section of a mandibular canine?

oval

The mandibular canine has 1 root canal what % of the time?

75%

The mandibular canine has 2 root canals what % of the time?

25%

Which tooth has these root canal properties?
One pointed pulp horn
Wider labiolingually than mesiodistally
Buccolingual measurement of pulp widest in cervical 1/3 of crown.

mandibular canine

Which tooth?
One straight root with pointed apex.
Bifurcations occasionally occur.

mandibular 1st PM

What is the cross-sectional shape of the mandibular 1st PM?

ovoid

What % of the time does the mandibular 1st PM have 1 root canal?

74.5%

What % of the time does the mandibular 1st PM have 2 root canals?

25%

Which tooth has these root canal properties?
Large Buccal pulp horn
Canal much wider buccolingually than mesiodistally

mandibular 1st PM

Which tooth?
One root
Wider and longer than mandibular first premolar

mandibular 2nd PM

What is the shape of the cervical cross-section of a mandibular 2nd PM?

Oval (similar to mand. 1st PM but rounder)

Which tooth has one root canal 100% of the time but can have 2-3 pulp horns?

mandibular 2nd premolar

If a mandibular 2nd PM has 3 cusps, how many pulp horns does it have?

3

If a mandibular 2nd PM has 2 cusps, how many pulp horns does it have?

2

Which premolar is the least likely to have two root canals?

mandibular 2nd PM

How many roots do the mandibular 1st and 2nd molar have? What are they called?

2, M and D

Which root is longer for mandibular 1st molar?

Approximately equal length

Which root for mandibular 1st molar is wider and stronger?

mesial

Which root for mandibular 1st molar is smaller?

distal

Which tooth?
Both roots wider buccolingually than mesiodistally
Wide root trunk

mandibular 1st molar

What shape is the cross-section of the pulp chamber of the mandibular 1st molar?

rectangular

How many root canals does a mandibular 1st molar usually have?

3 (2 M, 1 D)

A mandibular 1st molar has 4 root canals how often?

25% (2 M and 2 D)

How many pulp horns does a mandibular first molar usually have?

5

A mandibular 2nd molar has two roots (M and D), which is longer?

mesial

T/F: Mandibular 2nd molar roots tend to be more fused than first molar.

True

What is the shape of the pulp chamber of mandibular 2nd molars?

trapezoidal

What % of the time do mandibular 2nd molars have 3 canals (MB, ML, D)?

80

What % of the time do mandibular 2nd molars have 2 canals (M and D)?

12%

What % of the time do mandibular 2nd molars have 4 canals?

8%

Which tooth?

Root:

Usually two roots, but very variable

Roots often fused.

Root Canals:

Usually three root canals, four or five pulp horns

mandibular 3rd molar