Endodontic Access 1

Question 1

What 3 things does a tooth need to be to do RCT on it?

Answer 1

Restorable
Periodontally Sound
Strategic

Question 2

are triangular with the base of the triangle toward the incisal

Answer 2

Maxillary central incisors

Question 3

follow the same form (triangular) but are narrower and less flared incisally
-more oval

Answer 3

Maxillary lateral incisors

Question 4

also have the same general form (triangular) but are closer to an oval

Answer 4

Maxillary canines

Question 5

How often do mand incisors have 2 canals?

Answer 5

40%

Question 6

What shapes are the mand anteriors?

Answer 6

triangular but mostly oval

Question 7

are very narrow and have 2 canals 40%of the time so

the access is very narrow M-D and extends further incisally

Answer 7

Mandibular central & lateral incisors

Question 8

are oval and similar to maxillary canine access

Answer 8

Mandibular canines

Question 9

How deep should your access but go into tooth?

Answer 9

7 mm

Question 10

What 2 burs can be used for access in endo?

Answer 10

2 round

330

Question 11

Total straight-line access on anteriors would involve access from the facial and create a weakening of the incisal edge and an esthetic issue.***

Answer 11

“Incisal compromise”

Question 12

What is used for shaping the access for anterior teeth to provide straight line access without incisal compromise?

Answer 12

Diamond bur

Question 13

What is used for shaping the access for posterior teeth to provide straight line access without incisal compromise?

Answer 13

Endo EZE bur

Question 14

What is used for find the canals of accessed teeth?

Answer 14

Endo explorer

Question 15

• Triangular/Oval Access
• Thinner root than central (narrower access M-D narrower pulp horns)
• Root often curves to distal; Can be VERY DIFFICULT to maintain curve especially in youth
• Apex tips to palatal
• “Incisal Compromise” on all anterior teeth

Answer 15

Max lateral incisor

Question 16

• Triangular/Oval access
• Canal narrower M-D than F-L
• One root (larger and longer  
than lateral)
• USUALLY SINGLE CANAL 
(most max. anteriors)

Answer 16

Max canine

Question 17

• Oval access (use #2 round bur)
• Root wider F-L than M-D
• Very narrow M-D (easy to perforate to side of root)
• One canal 60% Two canals 40%
• When two canals-mostly Type II (See Weine)
• Benjamin and Dowson study
• Must extend access toward incisal to locate
lingual canal) LOOK at XR-also adjacent teeth.

Answer 17

Mand incisors

Question 18

Which of the 2 canals is most commonly missed in mand incisors?

Answer 18

Buccal canal

Question 19

What type of canal
one canal from
pulp chamber to apex

Answer 19

•Type I:

Question 20

What type of canal
2 canals from
pulp chamber, join
prior to apex

Answer 20

•Type II:

Question 21

What type of canal
2 canals from
pulp chamber to apex

Answer 21

•Type III:

Question 22

What type of canal
 one canal 
from pulp chamber 
divides prior to apex 
(most difficult to treat)

Answer 22

•Type IV:

Question 23

What type of canal configuration is a fast break?

Answer 23

type 4

Question 24

The premolars are all what shape?

Answer 24

Oval

Question 25

________ contain a B. & a L. canal in at least 85% of cases. M-D width of the access
is no wider than a #4 round bur and the opening usually extends from near the tip of the buccal cusp lingually as a
narrow oval

Answer 25

Maxillary first premolars

Question 26

_______ contain a second canal in at least 35% of cases and the access form is
very similar to the first PM. If there is a single canal, it is centrally located and wide from B to L.

Answer 26

Maxillary second premolars

Question 27

_________ also have a very narrow M-D width and access
extends from near the tip of the buccal cusp lingually.
2 canals are somewhat rare and very difficult.

Answer 27

Mandibular PMs

Question 28

• Thin Oval Access (width of #4)
• thin M-D root
• Two canals most prevalent 
• 85% two canals
• 9%  one canal 
• 6%  three canals
• Canal orifices lie under respective cusp 
tips

Answer 28

Max PM

Question 29

How can you tell between the roof and root on an access with 2 canals?

Answer 29

Endo explorer chips roof

Color of dentin

Question 30

• Access: Thin oval (width of #4)
• Slightly less F-L extension than 1st
• Most often Type I 1 root 1 canal (75-
85%); Type II, III & IV less frequently
• 2 roots (15 -25%) - Vertucci Study
• 3 roots very rarely
• If one canal found but not in center F-L, 
there are probably 2 canals
• Beware Type IV, very hard to shape, 
clean and fill

Answer 30

Max 2nd PM

Question 31

• Access: thin oval
• Usually one root, 1 canal 
(type I), 73.5 %
• Type III, 19.5 %***
• Three canals less than 1%
• Vertucci study

Answer 31

Mand 1st PM

Question 32

-The walls of the pulp chamber are concentric to the
external outline of the tooth at the level of the CEJ
- If the tooth is narrow M-D, the pulp chamber will
be narrow M-D, etc.

Answer 32

“The Law of Concentricity”