Root Camp Lecture 10 - Anatomy and Access of Molars

Question 1

Any branch of main pulp canal or chamber that communicates w/ the external surface of the root

Answer 1

Accessory canals

Question 2

What are the following considered?

Lateral canal
Apical ramification
Apical delta
Furcation canal

Answer 2

Accessory canals

Question 3

Extension of main canal in coronal or middle third of root

Answer 3

Lateral canal

Question 4

Extension of canal in apical third of root

Answer 4

Apical ramification

Question 5

Main canal divides into multiple apical ramifications, rather than a major apical foramen

Answer 5

Apical delta

Question 6

Which molar?

3 root system (MB, DB, P)
MB root is most likely going to have 2 canals

Answer 6

Maxillary 1st molar

Question 7

Which molar?

Average length = 20 mm

Answer 7

Maxillary 1st and 2nd molars

Question 8

Which molar?

Average number of roots = 3
Average number of canals = 4

Answer 8

Maxillary 1st molar

Question 9

Which molar?

MB and DB roots are well separated
P root is seen btwn MB and DB roots

Answer 9

Maxillary 1st and 2nd molar

Question 10

Which molar?

Largest of all maxillary teeth

Answer 10

Maxillary 1st molar

Question 11

Which molar?

Roots from longest to shortest:
P, MB, DB

Answer 11

Maxillary 1st and 2nd molar

Question 12

Which molar?

Of the 2 buccal cusps, MB is longest and widest, DB is sharpest

Answer 12

Maxillary 1st molar

Question 13

Which molar?

Mid root cross-section is ovoid
MB and DB are wider B-L
P is wider M-D

Answer 13

Maxillary 1st molar

Question 14

Which molar?

P root is the 3rd longest root in the maxilla

Answer 14

Maxillary 1st molar

(1st = canine; 2nd = 2nd premolar)

Question 15

Before instrumenting the P root of the maxillary 1st molar, examine the _________ _______ of the WL of this root to determine if there is a curvature in the apical 1/3

Answer 15

apical 1/3

Question 16

T/F: If the apical third of the maxillary 1st molar curves in the buccal direction, it can be determined by radiographic evidence

Answer 16

FALSE, if it curves in the buccal direction, it cannot be determined by radiographs!

Question 17

T/F: Due to high probability of a MB2 canal in the maxillary 1st molar, it should always be assumed that it is present

Answer 17

True

Question 18

Which canal of the maxillary 1st molar?

Within 1-2 mm of MB canal or at midpoint btwn palatal orifice and MB orifice

Answer 18

MB2

Question 19

How do you find the pulp chamber in older patients with extreme calcification?

Answer 19

Discoloration of pulp chamber floor

Question 20

Which canals should be the last aspect of access prep in order to avoid inadvertent destruction of mesial tooth structure in maxillary 1st molars?

Answer 20

MB canals

Question 21

Which molar?

3 root system (MB, DB, P) that is often fused
MB root is less likely going to have 2 canals

Answer 21

Maxillary 2nd molar

Question 22

Which molar?

Average number of roots = 3
Average number of canals = 3 or 4 (50/50 chance)

Answer 22

Maxillary 2nd molar

Question 23

Which molar?

MB and DB roots taper to apex and curve to the distal

Answer 23

Maxillary 2nd molar

Question 24

Which maxillary molar has a larger MB cusp?

Answer 24

Maxillary 2nd molar

(bc of the location of the buccal groove!)

Question 25

Which molar? P root is longest and is banana shaped, it extends beyond the crown outline lingually

Answer 25

Maxillary 2nd molar

Question 26

Which molar? Longitudinal depression is present on P root

Answer 26

Maxillary 2nd molar

Question 27

Which molar? Starting point is central groove on mesial region, 1/2 way btwn MB and ML cusp on the oblique ridge

Answer 27

Maxillary 1st and 2nd molar

Question 28

Which molar? Initial penetration angle is parallel to long axis with a slight inclination towards the P canal

Answer 28

Maxillary 1st and 2nd molar

Question 29

Which molar? External outline form is a triangle, with base towards buccal

Answer 29

Maxillary 1st and 2nd molar

Question 30

Which molar? 2 root system that is often fused

Answer 30

Mandibular 2nd molar

Question 31

Which molar? Average length = 21 mm

Answer 31

Mandibular 1st and 2nd molar

Question 32

Which molar? Average number of roots = 2 Average number of canals = 3

Answer 32

Mandibular 1st and 2nd molar

Question 33

Which molar? Roots are twice as long as the crown

Answer 33

Mandibular 1st and 2nd molar

Question 34

Which molar? Depression btwn bifurcation and cervical line

Answer 34

Mandibular 1st and 2nd molar

Question 35

Which molar? Smaller and shorter occluso-cervically Narrower M-D

Answer 35

Mandibular 2nd molar

Question 36

Which molar? Buccal cervical ridge may be present and most prominent in the mesial portion

Answer 36

Mandibular 2nd molar

Question 37

Which molar? MB cusp is wider than DB cusp

Answer 37

Mandibular 2nd molar

Question 38

Which molar? M root is broad B-L, has a longitudinal depression, and tapers to blunt apex

Answer 38

Mandibular 1st and 2nd molar

Question 39

Which molar? D root is narrower B-L, may have a longitudinal depression, and has a more pointed apex

Answer 39

Mandibular 1st and 2nd molar

Question 40

Which molar? Crown is more convex

Answer 40

Mandibular 2nd molar

Question 41

Which molar? Roots are narrower on L than B

Answer 41

Mandibular 1st and 2nd molar

Question 42

Which molar? Roots are closer to each other

Answer 42

Mandibular 2nd molar

Question 43

Which molar? Crown outline is rectangular

Answer 43

Mandibular 2nd molar

Question 44

Which molar? May have a C-shaped canal system, which can result in a blending of the M and D canals, leading to a wide canal orifice of these canals

Answer 44

Mandibular 1st and 2nd molars

Question 45

C-shaped canals are often found in patients of what descent?

Answer 45

Asian

Question 46

Which molar? 2 root system M root usually has 2 canals

Answer 46

Mandibular 1st molar

Question 47

Which molar? M root is curved toward the distal in the apical 1/3 D root is straight, and the axis is angled distally

Answer 47

Mandibular 1st molar

Question 48

Which molar? M root is widest and strongest D root is straighter Both M and D roots curve distally

Answer 48

Mandibular 1st molar

Question 49

Which molar? Wider M-D Higher occluso-cervically

Answer 49

Mandibular 1st molar

Question 50

Which molar? Widest M-D dimension of any tooth

Answer 50

Mandibular 1st molar

Question 51

Which molar? External outline form should be more square if 2 distal canals are present

Answer 51

Mandibular 1st molar

Question 52

Which molar? MAF should be larger than a 30 K-file

Answer 52

Mandibular 1st molar

Question 53

Which molar? Starting point on central groove, at 1/2 way point on mesial region

Answer 53

Mandibular 1st and 2nd molar

Question 54

Which molar? Initial penetration angle is parallel to long axis, with a slight inclination towards the distal canal

Answer 54

Mandibular 1st and 2nd molar

Question 55

Which molar? External outline form is a triangle, with base towards mesial

Answer 55

Mandibular 1st and 2nd molar

Question 56

What is the average height of a pulp chamber in molars?

Answer 56

1.5-2 mm

Question 57

The pulp chamber ceiling in molars is found at the level of the _______

Answer 57

CEJ