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Endodontics > Root canal anatomy > Flashcards

Root canal anatomy Flashcards

1
Q

Radiographic Hints of “Abnormal”

A

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

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2
Q

Weine Classification

A

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

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3
Q

Maxillary Anterior general anatomy considerations

A

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

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4
Q

Max 1st premolar canal stats

A

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

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5
Q

Max 2nd Premolar canal Stats

A

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

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6
Q

Max 1st Molar MF root stats

A 
1 Canal ...20%
2 Canals....77%
     Weine type II =>40%
    Weine type III => 60%
3 Canals....3%
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7
Q

Max 2nd Molar MF root stats

A

1 Canal….63%

2 Canals …..37%

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8
Q

Avg distance between MB1 and MB2 orifices

A

1.8mm

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9
Q

Maxillary Molar DB canal generalities

A

Straightest canal

most conical

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10
Q

Max Molar P canal generalities

A

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

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11
Q

Man Ant incisor canal stats

A

1 Canal ….57%
2 Canals ….43%

1 Foramen …99%

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12
Q

Man Canine Canal Stats

A

2 Canals …22%

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13
Q

Man Ant generalities

A

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

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14
Q

Man 1st Premolar Canal Stats

A

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

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15
Q

Man 2nd Premolar Canal Stats

A

1 Canal 97%

2 Canals 3%

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16
Q

Man 1st Molar Canal Stats

A

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

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17
Q

Man 2nd Molar Canal Stats

A

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

18
Q

Man 1st Molar M root

A

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

19
Q

Man 1st Molar D root

A

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

20
Q

Middle Mesial in Man 1st Molar

A

2-13% but may be closer to 50%

usually join MF or ML (90%)

21
Q

C shaped canal

A 
–Difficult to debride
	–Difficult to obturate
	–Radiographic hints:
		- Conical roots
		- Indistinct features
22
Q

Furcation, Lateral, & Accessory Canals

A

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

23
Q

Accessory Canals

A

Incidence: 10 - 47 %
Debridement
Obturation
Surgical removal

24
Q

Furcation Canals

A 
Incidence: 8 - 76 %
Patency
Isolated Furcal Defects
Necrotic Pulp
Medicaments
Ca(OH)2
25
Q

Anatomic Laws

A 
Centricity
Concentricity
CEJ
Symmetry
Color Change
Orifice Location
26
Q

Law of Centricity

A

Pulp chamber in center of tooth at level of CEJ

27
Q

Law of Concentricity

A

Chamber walls are concentric to external surface

28
Q

Law of CEJ

A

landmark for pulp chamber location (97% of time)

29
Q

Law of symmetry

A

Orifices are equidistant and perpendicular from MD line

30
Q

Law of Color Change

A

Pulpal floor is darker than walls

31
Q

Law of Orifice Location

A

at junction of floor and walls

32
Q

Lateral Canals

A 
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
Q

Root Concavities

A 
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
Q

% of canals with curvature

A

97%

35
Q

Secondary canal curvature incidence

A

30%

36
Q

Concresence

A

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

37
Q

Fusion

A

Union of 2 tooth germs during development

38
Q

Dens invaginatus

A

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

39
Q

Dens Evaginatus

A

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

40
Q

Taurodontism

A

Increased pulp chamber size w/ or w/o pulp stones

shortened roots often with curvatures

Endodontics (9 decks)

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