Dental Anatomy V - Quiz 4

Question 1

Name the Facial Cusps of the Mandibular 1st Molar?

Answer 1

Mesiofacial
Distofacial
Distal

Question 2

Describe the Facial Cusps of the Mandibular 1st Molar

Answer 2

Mesiofacial - Almost Flat

Distofacial - 90 degrees, More Pointed than MF

Distal - very small, Lingual, more pointed than MF or DF

Question 3

Describe the MF cusp of the Mdb1M

Answer 3

Almost flat

Question 4

Describe the DF cusp of the Mdb1M

Answer 4

90 degrees

More pointed than MF

Question 5

Describe the Distal cusp of the Mdb1M

3 things

Answer 5

Small
Lingual
More pointed than MF or DF

Question 6

T/F

There is no Facial groove in the Mdb1M

Answer 6

False

• Two of them
• Mesiofacial groove
• Distofacial groove

Question 7

Which groove is shorter, the Mesiofacial or Distofacial groove of the Mdb1M?

Answer 7

Mesiofacial

Question 8

The Mesiofacial groove of the Mdb1M extends from the ______ to the ______.

Answer 8

Occlusal

Halfway to Cervical Line

Question 9

What is at the end of the MF groove of the Mdb1M?

Answer 9

Slight lateral depression

Question 10

How long is the Root Trunk in the Facial aspect of the Mdb1M?

Answer 10

3mm

Question 11

Describe the Depression on the facial aspect of the Mdb1M

3 points

Answer 11

Deep
progressively Shallow occlusally
Does NOT cross cervical line

Question 12

How are the 2 roots of the Mdb1M positioned from the Facial aspect?

Answer 12

Mesially

Distally

Question 13

How do the roots of the Mdb1M compare to the roots of the Mdb2M?
(2 points)

Answer 13

Longer

More divergent

Question 14

Which root length is greater in the Mdb1M, the Facial or Lingual aspect?
Why?

Answer 14

Lingual

Cervical line has moved occlusally 1mm on the Lingual side

Question 15

Where is the Cervical Line higher in the Mdb1M, Lingual or Facial?
By how much?

Answer 15

Lingual

1mm
making root length 4mm

Question 16

From the mesial aspect of the Mdb1M, what shap is the crown outline?

Answer 16

Rhomboidal

Question 17

Mesial aspect Mdb1M: The Crest of Contour of the Cervical Ridge is _______ than MaxM’s, but _______.

Answer 17

Higher Occlusally

Still in Cervical 1/3

Question 18

Mdb1M - Mesial Aspect

What is the angle between the Triangular Ridge of the ML cusp and the Mesial Marginal Ridge?

Answer 18

30 Degrees

Question 19

Why can very little occlusal surface be seen from the Mesial Aspect of the Mdb1M?

Answer 19

Mesial cusps Taller

Question 20

Mdb1M - Distal Aspect

The facial outline of the Distal Cusp is _____ to the facial outline of the taller _____ cusp

Answer 20

Lingual

Distofacial

Question 21

From the Distal Aspect Mdb1M, what is superimposed onto the Distofacial Cusp?

Answer 21

Entire Distal Cusp

Question 22

What EXCLUSIVELY makes up the distal contact area of the Mdb1M?
Where is this located in relation to the faciolingual bisector of the crown?

Answer 22

Distal Cusp

```
Slightly Facial
definitely NOT lined up
~~~

Question 23

Mdb1M - Distal Aspect

Both the distal and distofacial cusp tips are _____ to the apices of the mesial and distal roots.

Answer 23

Facial

Question 24

What is the most Facially placed cusp in the Mdb1M?

Answer 24

Distofacial cusp

Question 25

What is the most Distally placed cusp in the Mdb1M?

Answer 25

Distal cusp

Question 26

What is the most Mesially placed cusp in the Mdb1M?

Answer 26

Mesiolingual cusp

Question 27

What are the cusp sizes of the Mdb1M from largest to smallest?

Answer 27

``` Mesiofacial Mesiolingual Distolingual Distofacial Distal ```

Question 28

Mdb2M - Facial Aspect How many facial grooves? What does it divide? Where does it end?

Answer 28

One Mesiofacial and Distofacial cusps Distinct pit in Middle 1/3 of crown

Question 29

What are the 2 pieces of Negative Anatomy on the Facial Aspect of the Mdb2M?

Answer 29

Facial Groove Facial Pit (middle 1/3)

Question 30

Describe the path and location of the facial groove in the Mdb2M

Answer 30

path: slight Mesial bend toward Facial Pit location: slightly Distal to vertical line dividing line in half

Question 31

Mdb2M Mesiofacial cusp is located closer to: Vertical faciolingual long axis bisector, or Facial outline

Answer 31

Vertical faciolingual long axis bisector

Question 32

Mb2M - Occlusal View Which set of cusps is offset further from their respective outlines? What 1 cusp in particular?

Answer 32

Facial Cusps Mesiofacial cusp especially

Question 33

Describe the Lingual cusps of the Mb2M

Answer 33

Not as offset as far from Lingual outline as Facial cusps are offset from Facial outline

Question 34

What divides the Occlusal surface of the Mb2M into halves?

Answer 34

Central Groove

Question 35

What meets at right angles at the Central Groove of the Mb2M? (these are the 3 major grooves)

Answer 35

Facial groove Lingual groove Central groove

Question 36

What do the facial, lingual, and central grooves of the Mb2M make? What does this delineate?

Answer 36

cross design 4 cusps approximately equal size

Question 37

To what side is the central pit of the Mb2M offset?

Answer 37

Lingually *forms from facial, lingual, central grooves

Question 38

Where do the lateral ends of the central groove end in the Mb2M?

Answer 38

Mesial and Distal Triangular fossae

Question 39

T/F | The Mesial and Distal Triangular fossae of the Mb2M each have a triangular Pit

Answer 39

True

Question 40

Each of the 4 cusps of the Mb2M have 3 features. | What are they?

Answer 40

Mesial and Distal Cuspal Ridges Triangular Ridge

Question 41

The Triangular Ridges of the Mb2M form what?

Answer 41

2 Transverse Ridges

Question 42

What feature of the Mb3M often exhibits decay because it is difficult to clean? Where is it located?

Answer 42

Facial Pit Middle 1/3 Facial aspect

Question 43

Mb3M - Mesial aspect | Where is the Central Groove located?

Answer 43

Lingual to faciolingual long axis bisector

Question 44

Mb3M - Occlusal | What direction is wider?

Answer 44

Mesiodistal wider than faciolingual | just like other molars