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Flashcards in Root canal anatomy Deck (40):
1

Radiographic Hints of “Abnormal”

Things not normal size
Things not centered
Things that abruptly change
Things that look “off ”

2

Weine Classification

I - 1 canal
II - 2 canals that become one at apex
III 2 canals that remain separate
IV - 1 canal that splits in the apical third

3

Maxillary Anterior general anatomy considerations

Central incisor … broad M - D pulp horns
Lateral incisor … apical D curvature
Canine … canal broader in B - L dimension … apical F, B curvature
Lingual shelf

4

Max 1st premolar canal stats

1 canal ......................................9%
2 canals (2/3 stay separate)...85%
3 canals ....................................6%

5

Max 2nd Premolar canal Stats

1 canal.....................................48%
2 canals (1/2 stay separate)....51%
3 canals.....................................1%

6

Max 1st Molar MF root stats

1 Canal ...20%
2 Canals....77%
Weine type II =>40%
Weine type III => 60%
3 Canals....3%

7

Max 2nd Molar MF root stats

1 Canal....63%
2 Canals .....37%

8

Avg distance between MB1 and MB2 orifices

1.8mm

9

Maxillary Molar DB canal generalities

Straightest canal
most conical

10

Max Molar P canal generalities

Wider in M-D dimension
Often curves to B in apical third
Obturation may appear short
prone to perforation/ledging from large instruments

11

Man Ant incisor canal stats

1 Canal ....57%
2 Canals ....43%

1 Foramen ...99%

12

Man Canine Canal Stats

2 Canals ...22%

13

Man Ant generalities

Broader B - L than M - D
Lingual shelf
Canine may have 2 roots
Incisors … ideal access through incisal edge

14

Man 1st Premolar Canal Stats

1 Canal ....75%
2 Canals....24%
3 Canals...1%

15

Man 2nd Premolar Canal Stats

1 Canal 97%
2 Canals 3%

16

Man 1st Molar Canal Stats

2 Canals...7%
3 Canals....64%
4 Canals...29%

17

Man 2nd Molar Canal Stats

2 canals...4%
3 Canals 81%
4 Canals 11%
C shaped 3%

18

Man 1st Molar M root

93% have 2 canals
60% stay separate
40% join

19

Man 1st Molar D root

29% have 2 Canals
40% stay separate
60% Join

20

Middle Mesial in Man 1st Molar

2-13% but may be closer to 50%
usually join MF or ML (90%)

21

C shaped canal

–Difficult to debride
–Difficult to obturate
–Radiographic hints:
- Conical roots
- Indistinct features

22

Furcation, Lateral, & Accessory Canals

Breaks in root sheath
Can occur anywhere
Usually in apical third
Contact with pulp and PDL

23

Accessory Canals

Incidence: 10 - 47 %
Debridement
Obturation
Surgical removal

24

Furcation Canals

Incidence: 8 - 76 %
Patency
Isolated Furcal Defects
Necrotic Pulp
Medicaments
Ca(OH)2

25

Anatomic Laws

Centricity
Concentricity
CEJ
Symmetry
Color Change
Orifice Location

26

Law of Centricity

Pulp chamber in center of tooth at level of CEJ

27

Law of Concentricity

Chamber walls are concentric to external surface

28

Law of CEJ

landmark for pulp chamber location (97% of time)

29

Law of symmetry

Orifices are equidistant and perpendicular from MD line

30

Law of Color Change

Pulpal floor is darker than walls

31

Law of Orifice Location

at junction of floor and walls

32

Lateral Canals

Incidence: 10 - 76 %
Suspect with lateral lesion
More in posterior teeth
Seldom a factor for success
Debridement and obturation
Ultrasonics
Calcium hydroxide
Softened gutta-percha
Sealer

33

Root Concavities

DANGER ZONE
Mesial root Man 1st molar
Max premolars, especially on the mesial
Max 1st molars, MB root
Instrumentation moves canal towards the danger zone
Watch for 2 PDL’s

34

% of canals with curvature

97%

35

Secondary canal curvature incidence

30%

36

Concresence

union of two or more teeth via fusion of the cementum; most commonly see in max permanent molars

37

Fusion

Union of 2 tooth germs during development

38

Dens invaginatus

4 types
.25-10% incidence
most common in max laterals

39

Dens Evaginatus

2.2% prevalence
84% of times occurs in Man premolars
Asian Female

40

Taurodontism

Increased pulp chamber size w/ or w/o pulp stones
shortened roots often with curvatures