Morphology & Access

Question 1

Which three maxillary teeth have only one canal 100% of the time?

Answer 1

Central incisor, lateral incisor, canine

Question 2

What shape is the access prep on incisors?

Answer 2

tri-oval pointing apically

Question 3

The maxillary first premolar is most likely to have which canal morphology?

Answer 3

2 roots with a canal in each

Question 4

The maxillary second premolar has 1 root with 1 canal __% of the time.

Answer 4

53% (most common)

Question 5

Are maxillary 1st molars more likely to have 3 or 4 root canals?

Answer 5

4 canals (60% of the time)

Question 6

Which root on the mx 1st molar will have more than one canal if it’s a 4 canal tooth?

Answer 6

mesiobuccal root

Question 7

If the MB root of the mx 1st molar has two canals, is it more likely to have one or two foramina?

Answer 7

one foramen (80% commonality)

Question 8

Maxillary second molars have 3 canals __% of the time. (most common morphology)

Answer 8

60%

Question 9

T or F: Maxillary molars with a two canal MB root are more likely to have one foramen.

Answer 9

True (for both 1st and 2nd molars)

Question 10

How likely is it for a mx 1st premolar to have converging canals?

Answer 10

12%

Question 11

Which mx premolar is more likely to have converging canals?

Answer 11

mx 2nd premolar (22%)

Question 12

Do access preps on mx molars normally cross the oblique ridge?

Answer 12

No

Question 13

Are mandibular incisors more likely to have 1 or 2 canals?

Answer 13

2 canals (w/ 1 foramen)

Question 14

How many canals are canines likely to have?

Answer 14

1 canal (mx is 100% of time)

Question 15

Mandibular canines have 2 canals __% of the time.

Answer 15

30% (one foramen is more common)

Question 16

The md 1st premolars are likely to have which canal morphology?

Answer 16

1 canal, 1 foramen (70%)

Question 17

The md 1st premolars have 2 roots, each with a canal and foramen __% of the time.

Answer 17

13%

Question 18

Which md premolar has more canal variation?

Answer 18

1st premolar

Question 19

The mesial root of the md 1st molar usually has which canal morphology?

Answer 19

2 canals, 2 foramina

Question 20

The distal root of the md molars is likely to have which canal morphology?

Answer 20

1 canal, 1 foramen

Question 21

90% of the time, the D root of the md 1st molar has __ foramina.

Answer 21

one foramen

Question 22

Mesial roots of the md molars are most likely to have what canal morphology?

Answer 22

2 canals, 2 foramina (1st = 60%)(2nd = 40%)