Dental Anatomy V - Quiz 4 Flashcards Preview

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Flashcards in Dental Anatomy V - Quiz 4 Deck (44):
1

Name the Facial Cusps of the Mandibular 1st Molar?

Mesiofacial
Distofacial
Distal

2

Describe the Facial Cusps of the Mandibular 1st Molar

Mesiofacial - Almost Flat

Distofacial - 90 degrees, More Pointed than MF

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

3

Describe the MF cusp of the Mdb1M

Almost flat

4

Describe the DF cusp of the Mdb1M

90 degrees
More pointed than MF

5

Describe the Distal cusp of the Mdb1M
(3 things)

Small
Lingual
More pointed than MF or DF

6

T/F
There is no Facial groove in the Mdb1M

False

*Two of them
- Mesiofacial groove
- Distofacial groove

7

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

Mesiofacial

8

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

Occlusal
Halfway to Cervical Line

9

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

Slight lateral depression

10

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

3mm

11

Describe the Depression on the facial aspect of the Mdb1M
(3 points)

Deep
progressively Shallow occlusally
Does NOT cross cervical line

12

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

Mesially
Distally

13

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

Longer
More divergent

14

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

Lingual

Cervical line has moved occlusally 1mm on the Lingual side

15

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

Lingual

1mm
(making root length 4mm)

16

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

Rhomboidal

17

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

Higher Occlusally

Still in Cervical 1/3

18

Mdb1M - Mesial Aspect
What is the angle between the Triangular Ridge of the ML cusp and the Mesial Marginal Ridge?

30 Degrees

19

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

Mesial cusps Taller

20

Mdb1M - Distal Aspect
The facial outline of the Distal Cusp is _____ to the facial outline of the taller _____ cusp

Lingual

Distofacial

21

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

Entire Distal Cusp

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?

Distal Cusp

Slightly Facial
(definitely NOT lined up)

23

Mdb1M - Distal Aspect
Both the distal and distofacial cusp tips are _____ to the apices of the mesial and distal roots.

Facial

24

What is the most Facially placed cusp in the Mdb1M?

Distofacial cusp

25

What is the most Distally placed cusp in the Mdb1M?

Distal cusp

26

What is the most Mesially placed cusp in the Mdb1M?

Mesiolingual cusp

27

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

Mesiofacial
Mesiolingual
Distolingual
Distofacial
Distal

28

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

One

Mesiofacial and Distofacial cusps

Distinct pit in Middle 1/3 of crown

29

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

Facial Groove

Facial Pit (middle 1/3)

30

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

path: slight Mesial bend toward Facial Pit

location: slightly Distal to vertical line dividing line in half

31

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

Vertical faciolingual long axis bisector

32

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

Facial Cusps

Mesiofacial cusp especially

33

Describe the Lingual cusps of the Mb2M

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

34

What divides the Occlusal surface of the Mb2M into halves?

Central Groove

35

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

Facial groove
Lingual groove
Central groove

36

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

cross design

4 cusps approximately equal size

37

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

Lingually

*forms from facial, lingual, central grooves

38

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

Mesial and Distal Triangular fossae

39

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

True

40

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

Mesial and Distal Cuspal Ridges

Triangular Ridge

41

The Triangular Ridges of the Mb2M form what?

2 Transverse Ridges

42

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

Facial Pit

Middle 1/3 Facial aspect

43

Mb3M - Mesial aspect
Where is the Central Groove located?

Lingual to faciolingual long axis bisector

44

Mb3M - Occlusal
What direction is wider?

Mesiodistal wider than faciolingual

(just like other molars)

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