Internal anatomy

Question 1

root of upper maxillary central incisor is usually:

Answer 1

straight or might have a slight labial curve

Question 2

how many pulp horns does the maxillary central incisor have ?

Answer 2

3

Question 3

how is the incisal outline of the lateral maxillary incisor different from the central maxillary incisor ?

Answer 3

it is more rounded

-only has 2 pulp horns instead of 3

Question 4

apical region of lateral maxillary incisor is usually curved:

Answer 4

in a distopalatal direction

Question 5

which tooth may have a developmental groove along its root?

Answer 5

maxillary lateral incisor

Question 6

longest tooth in arch:

Answer 6

canine

Question 7

maxillary canine root may be slightly inclined :

Answer 7

disto-labially

Question 8

number of root canals in maxillary first pre-molar :

Answer 8

usually 2 root canals(85%) , regardless of how many roots
-buccal root canal directly under buccal cusp and palatal root canal directly under palatal cusp

-palatal canal is usually larger

there are . 1 or 3 root canals are also possible

Question 9

danger in upper first pre-molar root canal treatment ?

Answer 9

presence of root concavities on both mesial and distal surfaces of the root . it is more prominent on the mesial side and makes it very easy to cause a perforation if the doctor is not careful

Question 10

how many pulp horns and what is the relation between them in the upper first premolar?

Answer 10

2 pulp horns , one under each cusp , one buccal , one palatal. the buccal horn is much more prominent than the palatal horn

Question 11

which root canal is usually the largest in the upper first premolar
?

Answer 11

palatal root canal (inverse of larger cusp, buccal)

Question 12

number of root canals in upper second premolar?

Answer 12

usually (75%) single canal
-24% 2 canals ( can be separate completely or merge as they go apically )

Question 13

bayonet curve is most prominent in :

Answer 13

upper 2nd premolars

Question 14

which tooth has the largest pulp chamber ?

how many pulp horns does it have ?

Answer 14

the maxillary first molar , has 4 pulp horns

Question 15

which root contains 2 canals more than 80% of the time ?

Answer 15

the mesiobuccal root of the maxillary first molar (MB1 and MB2)–CANNAL NAMES , sometimes merge into one canal

distobuccal and palatal roots usually contain just one canal

Question 16

curvature of the palatal root of the maxillary first molar ?

Answer 16

buccal curvature

Question 17

curvature of mesiobuccal root of maxillary first molar ?

Answer 17

distal

Question 18

curvature of the distobuccal root of maxillary first molar ?

Answer 18

straight

Question 19

cervical cross section of teeth : WRITE ON NOTES CUZ ITS CONFUSING SHWAYA

Question 20

Which is the only root other than the maxillary central incisor that is wider mesio-distally than it is labio-lingually ?

Answer 20

the palatal root of the maxillary first molar

Question 21

the maxillary 1st and 2nd molar roots are very close in internal anatomy , what are some differences ?

Answer 21

• the maxillary 2nd molar roots are narrower mesio-distally

-the 3 orafices of the 2nd maxillary molar are almost on the same line while they slightly poke out and are on different lines on the 1st molar

-maxillary second molar roots have a higher tendency to fuse

Question 22

number of root canals in lower incisors:

Answer 22

70% single
30% double

Question 23

how many pulp horns are in the lower incisors ?

Answer 23

3

Question 24

mandibular canine is narrower mesio-distally than maxillary canine

Question 25

number of root canals in mandibular canine ?

Answer 25

94% single
6% double

Question 26

number of roots/ root canals in the mandibular first premolar?

Answer 26

usually one root with one root canal ( 70%)

could be two root canals as well (30%)

Question 27

which tooth has a crown inclination of 30 degrees to the long axis of the tooth ?

Answer 27

the lower first premolar
-2nd mandibular premolar is less inclined

Question 28

number of roots and root canals of the mandibular 2nd premolar ?

Answer 28

usually one root and one canal

two roots or 2 root canals can present but the chances are lower than the first mandibular premolar

Question 29

which pulp horn is more prominent on :
-mandibular 1st premolar
does the same apply to the 2nd premolar?

Answer 29

1st: buccal
in the second premolar , the lingual cusp is more prominent than it is on the 1st premolar under the well developed lingual cusp

Question 30

what are the differnces between the mandibular 1st and 2nd premolars?

Answer 30

the 2nd premolar :
-has a more prominent lingual pulp horn than the one in the 1st
-is buccolingually wider
-crown has less lingual inclination
-distal cruve

Question 31

curvature of 2nd mandibular premolar?

Answer 31

distally

Question 32

pulp chamber shape of mandibualr first molar:

Answer 32

quadrilateral , wider mesially than distally

Question 33

mesial root curvature of mandibular first molar”

Answer 33

curves distally (broad bucco-lingually)

Question 34

distal root curvature of mandibular first molar:

Answer 34

either straigth of distal curvature

Question 35

danger zone of mandibular first molar:

Answer 35

distal surface of mesial root (has a concavity making it lacking in enamel and easy to poke a hole in

Question 36

number of roots/ root canals of mandibular first molar:

Answer 36

2 roots with 3 root canals
-2 canals in the mesial root ( can exit from 1 or 2 foramen)

-distal root can have a single or double cannal

Question 37

difference in roots between mandibular first and second molars :

Answer 37

in the mandibular 2nd molar , The mesial and the distal roots are usually closer together or have a longer root trunk and are more frequently fused, compared to the mandibular first molar.

-The roots are broader buccolingually than mesiodistally.

C-shape canal 7.5 % of the cases.

Question 38

C-shaped canal is most common in :

Answer 38

mandibular second molar , also 3rd mol;ar