Nbde Dental Anatomy Mol-Inf

Front 1

Which root of a Max. first molar commonly has two root canals?

Back 1

The mesiobuccal root

Front 2

The Max. 1st molar has _____ roots and _____ canals.

Back 2

3,3

Front 3

What root of the Max. 1st molar is usually the largest in dimension?

Back 3

Palatal root

Front 4

Which root of the Max. 1st molar is usually very wide buccolingually?

Back 4

mesiobuccal root

Front 5

What percentage of Max. 1st molar teeth have a fourth root canal?
Where is it located/

Back 5

15%
Found just lingual to the orifice of the mesiobuccal canal.

Front 6

What features are very prominent in the interior of the Max. first molar

Back 6

Pulp horns
Mesiobuccal and mesiolingual are higher than the distofacial and platal

Front 7

In all Molars where do the root canals join?

Back 7

Join the pulp chamber apical to the cementoenamel junction

Front 8

In which teeth will we most likely see a bifurcation in the apical third of the root?

Back 8

Max. first pre-molars

Front 9

Where do bifurcations in Mand. molars usually occur?

Back 9

Cervical or Middle third of the root

Front 10

What teeth have a single root type?

Back 10

Max and Mand. Incisors
Max. and Mand. canines
Max. second pre-molar
Mand. first and second pre-molars

Front 11

what teeth have bifurcating or two roots?

Back 11

Max. first pre-molars (buccal/palatal)
Mand. molars (mesial/distal)

Front 12

What teeth have a trifurcation or three roots?

Back 12

Max. first and second molars
(mesiobuccal, distobuccal, and palatal)

Some Max third molars but variations are many

Front 13

What is the largest longest and strongest root of the Max. first molar?

Back 13

Palatal

Front 14

What is the smallest root on the Max. first molar?

Back 14

Distobuccal

Front 15

The palatal root is the _____ _____ root of any of the maxillary teeth.

Back 15

3rd longest; after canine and 2nd premolars

Front 16

What are the characteristics of the palatal root of the max. first molar?

Back 16

Wider mesiodistally than faciolingually
Longitudinal depression on lingual
Concave on Buccal surface
From facial in line w/ facial groove

Front 17

If the max. sinus is perforated during surgery what root is most likely responsible?

Back 17

Palatal root of Max. 1st molar

Front 18

How many major cusps do mand. molars have compared to max. molars

Back 18

5:4

Front 19

When viewed occlusally what shape does Max. molars have?

Back 19

Rhomboid

Front 20

when viewed occlusally what shape does Mand. molars have?

Back 20

Rectangular

Front 21

How many roots do Mand. molars have?

Back 21

2

Front 22

How many roots do Max. molars have

Back 22

3

Front 23

Where do Mand. molars have pits and grooves?

Back 23

Occlusal and buccal surfaces

Front 24

Where do Max. molars have pits and grooves?

Back 24

Occlusal and lingual surfaces

Front 25

Mand. Molars are wider in which direction?

Back 25

mesiodistally vs. faciolingually

Front 26

Max. Molars are wider in which direction?

Back 26

faciolingually vs. mesiodistally

Front 27

What are the size relationships of the lingual cusps of mand. molars?

Back 27

Nearly equal

Front 28

What are the size relationships of the lingual cusps of max. molars?

Back 28

One large and one small

Front 29

What is formed by the union of the distal cusp ridge of the mesiolingual cusp and the triangular ridge of the distobuccal cusp in max. molars?

Back 29

Oblique ridge

Front 30

Mandibular molars have a _____ ridge; Max. molars have a _____ ridge.

Back 30

Transverse
Oblique

Front 31

A fissured groove is most frequently found on the ...
What is this called?

Back 31

Lingual surface of Max. molars
Distolingual Developmental Groove

Front 32

What does the distolingual developmental groove do to an occlusal cavity prep?

Back 32

Forces the occlusal prep to be extended onto the lingual surface

Front 33

Mandibular first molars have _____ pulp canals that are usually if not always found in the _____ root. Distal root usually has _____ canal.

Back 33

2, mesial, 1

Front 34

If a cross section is made of a mand. molar just apical to the bifurcation of the root what will the shape of the distal root be?
Mesial root?

Back 34

Distal = larger and kidney shaped
Mesial = smaller and circular

Front 35

Which canal curves more in a Mand. first molar?

Back 35

MB more than ML

Front 36

What are the characteristics of the mesial root of the mand. first molar?

Back 36

Very thin mesiodistally
wider faciolingually
concave on mesial and distal surfaces

Front 37

On the Mand. first molar what pulp horn is the highest?
What is the smallest?

Back 37

Mesial
Distal

Front 38

What is the rough shape of the floor of the pulp chamber in a Max. molar?

Back 38

Triangular
base: buccal canals
apex: palatal canal

Front 39

From either proximal view, max. molar crowns have what kind of outline?

Back 39

Trapezoidal outline
Longest side is base of crown

Front 40

From either proximal view mand. molar crowns have what kind of outline?

Back 40

Rhomboidal outline
Tilts toward lingual

Front 41

What does the lingual inclination of mand. molars do to its long axis position?

Back 41

Long axis positioned with root apices facial and crown lingual.
This encourages cusp fracture

Front 42

The distolingual cusp on permanent max. molars is called what?

Back 42

Talon Cusp

Front 43

Mandibular first molars have _____ pulp canals that are usually if not always found in the _____ root. Distal root usually has _____ canal.

Back 43

2, mesial, 1

Front 44

If a cross section is made of a mand. molar just apical to the bifurcation of the root what will the shape of the distal root be?
Mesial root?

Back 44

Distal = larger and kidney shaped
Mesial = smaller and circular

Front 45

Which canal curves more in a Mand. first molar?

Back 45

MB more than ML

Front 46

What are the characteristics of the mesial root of the mand. first molar?

Back 46

Very thin mesiodistally
wider faciolingually
concave on mesial and distal surfaces

Front 47

On the Mand. first molar what pulp horn is the highest?
What is the smallest?

Back 47

Mesial
Distal

Front 48

What is the rough shape of the floor of the pulp chamber in a Max. molar?

Back 48

Triangular
base: buccal canals
apex: palatal canal

Front 49

From either proximal view, max. molar crowns have what kind of outline?

Back 49

Trapezoidal outline
Longest side is base of crown

Front 50

From either proximal view mand. molar crowns have what kind of outline?

Back 50

Rhomboidal outline
Tilts toward lingual

Front 51

What does the lingual inclination of mand. molars do to its long axis position?

Back 51

Long axis positioned with root apices facial and crown lingual.
This encourages cusp fracture

Front 52

The distolingual cusp on permanent max. molars is called what?

Back 52

Talon Cusp

Front 53

What is the most obvious characteristic that distinguishes permanent 1st, 2nd, and 3rd max. molars from each other?

Back 53

Talon cusp gets smaller as you move distally

Front 54

What is the primary cusp triangle called on the max. molar

Back 54

Trigon

Front 55

What cusp forms the trigon of the max. molar?

Back 55

ML, MB, DB cusp
DL cusp = Talon cusp

Front 56

What is a cusp present abnormally called?

Back 56

Talon Cusp

Front 57

True/False
The Talon cusp might not be present on the Max. 1st and 2nd molars

Back 57

True

Front 58

True/False
The DL cusp or Talon cusp of the Max. molar is a pert of the primary

Back 58

False

Front 59

When restoring marginal ridges of posterior teeth what must you remember to do in order to keep enough strength?

Back 59

Round them off to form occlusal embrasures

Front 60

Where are marginal ridges found?

Back 60

Mesial and distal occlusal surfaces of molars/ premolars
mesial and distal surfaces of lingual surfaces of the incisors and canines

Front 61

As a general rule root tips tend to point which way?

Back 61

Toward the distal if at all
Max teeth least likely
mand. Centals and Canines most likely

Front 62

Relative to the long axis of the tooth Mand. molars are inclined to the ...

Back 62

Lingual and Distal

Front 63

What is the result of the Axis inclination of mand. molars?

Back 63

HofC is lowered apically to the middle third
Placement of instruments subgingivally is more difficult on the lingual

Front 64

What tooth is contacting the opening from the parotid gland and is thus more susceptible to calculus buildup?

Back 64

Max. second molar

Front 65

What is the opening of the parotid gland into the oral cavity called?

Back 65

Stenson's Duct

Front 66

How many roots are visible from the buccal aspect of the max. first molar?

Back 66

3

Front 67

What is the shape of the two buccal roots of a Max. first molar?

Back 67

Bent looking like a pair of pliers
Axes of the root inclined distally

Front 68

Molar roots originate as a single root base. What is this called?

Back 68

Root trunk (near CEJ)

Front 69

The place on multirooted teeth where the root trunk divides into separate roots.

Back 69

Furcation

Front 70

Mesial furcations are _____ to the cervical line.

Back 70

Closest

Front 71

Distal furcations are _____ to the cervical line.

Back 71

Furthest

Front 72

What is located on the buccal root of the max. first molar which starts at the bifurcation and terminates at the cervical line?

Back 72

Deep Developmental Groove

Front 73

What has to be taken into consideration for the Max. first molar when doing root planing?

Back 73

Distal surface of the root trunk has a concavity