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Endodontics > S2 - Root canal anatomy > Flashcards

S2 - Root canal anatomy Flashcards

1
Q

Mx central incisor (overall length, no. of canals)

A

23.6mm

1

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2
Q

Dr Rodrigo’s strategy for mx central RCT

A

WL 0.5-1mm from patency length

very end filled with sealer

vertical condensation not lateral condensation

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3
Q

Mx lateral incisor (overall L, canals, morphology and implication)

A

22.5mm

1 (3% have 2)

DP curvature (not straight root) -> must bend SS files* or may get ledge or perforation

*dont need to for NiTi

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4
Q

Mx canine

A

26(can be longer)

1 canal

DP curvature

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5
Q

Good tools for access cavity

A

burs: Endo-Z (best- to smooth walls and provide correct inclination), Tungsten carbide flat fissure bur, round burs

ultrasound tips: used to remove calcification in pulp floor and smooth walls, then use endo explorer to stab/find canals (DO NOT use burs in pulp floor)

*when ‘drop’ into pulp chamber felt, don’t keep drilling with burs, use Endo Z or other non-cutting tip bur and remove pulp roof

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6
Q

Access cavity for Mx centrals

A
  1. place bur perpendicular to palatal surface, drill 2-3mm
  2. change inclination along long axis of tooth until pulp chamber reached

need correct shape and be conservative

incisors = elongated triangle, canine = more oval

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7
Q

Mx 1st PM

A

21.5mm

mostly 2 root 2 canals - B and P (85%)
1 (8%)
3 (7%- like molar roots -2B, 1P)

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8
Q

Mx 2nd PM

A

21mm
1 (50%), 2 (50%)

1 root but 1-2 canals
(merge?)

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9
Q

Access cavity for PMs

A

start at middle between B and P cusps and make oval access cavity slowly, once you feel the drop, use a bur with non-cutting tip to smooth the walls (otherwise may drill into furcation)

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10
Q

Mx 1st molar

A

20mm

3 canals (30-40%) - 3 roots MB, DB, P
4 (60-80%) - MB2 (closer to P, most often MB2 and 1 merge but not always)

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11
Q

Issue with mx 1st molar

A

MB2 not always visible, must explore for it

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12
Q

Which is usually a bigger issue. Missing a MB2 that merges with MB1 or independent?

A

independent, some degree of disinfection of MB2 when merge at end (but bacteria still left in upper part) whereas if independent MB2 missed its a bigger issue

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13
Q

Mx 2nd molar

A

20mm

3 (75%), 2 (15%), 1 (10%), 4 (0.7% - difficult, narrow canal but need to look for it, use ultrasound tip and explorer)

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14
Q

Access cavity for mx molars

A

2B roots, 1P
-> triangle shaped access (base is B, apex P)

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15
Q

Md central and lateral

A

central 20.8mm

1 (73%), 2 (27% - B and L)

lateal 22mm
1(85%), 2 (15%)

(flattened canal - need to use Hedstroem file in circumferential filing motion at end to touch all the walls w canal flooded w NaOCl)

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16
Q

Common reason for failure in md incisors

A

small teeth, significant chances of having 2 canals

17
Q

Access cavity for md incisors

A

same as mx, first perpendicular to lingual surface for 2-3mm, then go down long axis of tooth to reach pulp chamber

elongated triangle shape

18
Q

Md canine

A

26mm

1 (88%), 2 (11%)

19
Q

Access cavity for md canine

A

oval shape
following same technique, usually some roof remaining, need to remove this all of roof to have straight access

20
Q

What must be achieved in ALL access cavities

A

remove/smooth all of pulp roof, to get straight access

21
Q

Md 1st PM

A

22mm

1 (66%), 2 (31% - 1B, 1L)

22
Q

Importance of taking 2 radiographs of different angulations

A

assess possibility of 2 canals

23
Q

Md 2nd PM

A

22mm
1(90%), 2 (10%)

24
Q

What is an uncommon anatomy for md premolar

A

C - shaped premolar
-> need to do CMP all the way around

25
Q

Access cavity for md PM

A

oval shape between B and L cusps

26
Q

Md 1st molar

A

21mm

3 (56%), 4 (36%), 2 (8%)

3- MB, ML, D canal usually centered in D root.
4- MB, ML, DB, DL. If u find 3 and they arent in a triangle, look for the DB/DL

27
Q

2 rare variations you may find in Md 1st molar

A
  1. MM canal (mesial middle): fortunately it usually merges with MB or ML, problem if independent
  2. Radix entomolaris: extra L root - you will have MB, ML, D and something L
28
Q

Summary of how many canals usually in teeth.

A

Mx central - 1
Mx lateral - 1
Mx canine - 1
1st PM - 2, 1, 3
2nd PM - 1 or 2, 50%/50%
1st molar -** 4**, 3
2nd molar - 3, 2, 1,4

Md central - 1, 2
Md lateral - 1, 2
Md canine -** 1,** 2
1st PM - ** 1,** 2
2nd PM - ** 1,** 2
1st molar -** 3,** 4, 2
2nd molar - **3, 2, 4

bold is most common, others are possible and listed from most common to

29
Q

Md 2nd molar

A

21mm

3 (73%), 2 (16%), 4 (11%)

30
Q

Rare variation of md 2nd molar

A

C shaped canals

31
Q

Access cavity for md molar

A

triangle

Endodontics (10 decks)

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