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oral anatomy > maxillary 1st molar > Flashcards

maxillary 1st molar Flashcards

1
Q

What is the largest and strongets tooth in the dental arch?

A

The first maxillary molar.

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2
Q

What is unique about the crown of the maxillary 1st molar?

A

Largest crown in permanent teeth.

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3
Q

How many well-developed cusps does the maxillary 1st molar have?

A

4

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4
Q

What additional (suplmental 5th) cusp does the maxillary 1st molar have on the mesial side?

A

The Cusp of Carabelli (a supplemental cusp).

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5
Q

Which cusp is particularly large on the maxillary 1st molar?

A

The mesiolingual (ML) cusp.

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6
Q

How does the width of the maxillary 1st molar compare mesiodistally and buccolingually?

A

It is wider buccolingually than mesiodistally.

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7
Q

What is notable about the root spread of the maxillary 1st molar?

A

It has the widest faciolingual (F/L) root spread in the mouth.

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8
Q

What is the widest root? (when viewed buccolingually)

A

mesiobuccal root

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9
Q

What shape is the occlusal view of the maxillary 1st molar?

A

Rhomboidal

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10
Q

What ridge connects the DB and ML cusps in the maxillary 1st molar?

A

The oblique ridge.

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11
Q

How many major cusps does the maxillary 1st molar have?

A

3 major cusps, forming a heart shape.

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12
Q

What types of angles are found on the occlusal surface of the maxillary 1st molar?

A

Obtuse and acute angles. (angled trapezoid)

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13
Q

How do the MB and DB cusps appear from the facial view of the maxillary 1st molar?

A

The MB cusp is rounder compared to the DB cusp.

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14
Q

What divides the two buccal cusps of the maxillary 1st molar?

A

The buccal developmental groove.

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15
Q

How does the cervical line appear on the facial view of the maxillary 1st molar?

A

It is irregular and curved, with the curve toward the apical 1/3.

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16
Q

What shape is the crown of the maxillary 1st molar from the facial view?

A

Trapezoidal

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17
Q

How does the mesial outline of the maxillary 1st molar appear from the facial view?

A

straight

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18
Q

Where is the mesial contact located on the maxillary 1st molar?

A

At the junction of the middle and occlusal 1/3.

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19
Q

When do the molars start to from?

A

At birth unless altered by system illness at birth

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20
Q

How does the distal outline of the maxillary 1st molar appear from the facial view?

A

has a marked convexity.

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21
Q

Where is the distal contact located on the maxillary 1st molar?

A

In the middle 1/3.

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22
Q

How does the DB cusp compare to the MB cusp?

A

The DB cusp is sharp, while the MB cusp is rounded.

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23
Q

How tall is the root trunk of the maxillary 1st molar?

A

4 mm tall. From the CEJ to the bifurcation

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24
Q

How many furcations do maxillary 1st molar have?

A

3 Furcations, On the mesial, distal, and buccal. Not lingual

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25
Q

What is important to note about the root form of the maxillary 1st molar?

A

The direction of curvature towards the distal

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26
Q

Which root is the largest in the maxillary 1st molar?

A

The palatal(lingual) root.

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27
Q

Which root is the second largest in the maxillary 1st molar?

A

The mesiobuccal root.

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28
Q

Which root is the smallest in the maxillary 1st molar?

A

The distobuccal root.

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29
Q

How do the lingual cusps compare to the facial cusps on the maxillary 1st molar?

A

The lingual cusps (ML and DL) are larger than the facial cusps.

30
Q

What happens to the lingual groove on the maxillary 1st molar?

A

It extends onto the occlusal surface and becomes the disto-oblique developmental groove.

31
Q

Is there a Mesio-lingual developmental groove present on the maxillary 1st molar?

A

Yes

32
Q

What is the smallest cusp in bulk on the maxillary 1st molar?

A

The distolingual cusp.

33
Q

How does the width of the lingual surface compare to the buccal surface on the maxillary 1st molar?

A

The lingual surface is wider than the buccal surface.

34
Q

What is the tallest cusp on the maxillary 1st molar?

A

Mesial lingual cusp

35
Q

What is clearly visible in the mesial view of the maxillary 1st molar?

A

The Cusp of Carabelli. (Mesial lingual cusp)

36
Q

How does the cervical line appear on the mesial view of the maxillary 1st molar?

A

It is slightly convex towards the cusp tip.

37
Q

Where is the buccal height of contour located on the maxillary 1st molar?

A

In the gingival 1/3.

38
Q

Where is the lingual height of contour located on the maxillary 1st molar?

A

In the middle 1/3.

39
Q

How does the CEJ appear on the mesial and distal view of the maxillary 1st molar?

A

Flat

40
Q

How does the MB root appear in the mesial view?

A

broad faciolingually (F/L) and most often has 2 canals.

41
Q

What is notable about the palatal/lingual root in the mesial view?

A

It may curve to the buccal in the apical third.

42
Q

How far is the bifurcation from the CEJ?

A

3 mm from the CEJ.

43
Q

How does the crown of the maxillary 1st molar appear from the distal view?

A

tapers toward the distal side.

44
Q

How does the buccolingual measurement on the mesial side compare to the distal side?

A

crown is wider on the mesial side than on the distal side.

45
Q

How does the cervical line appear on the distal view of the maxillary 1st molar?

A

straighter and less curved than on the mesial side.

46
Q

How do the distal marginal ridge and mesial marginal ridge heights compare?

A

the mesial marginal ridge is more occlusal then the distal marginal ridge.

47
Q

Are all the cusps visible from the distal view of the maxillary 1st molar?

A

Yes

48
Q

How many roots are visible from the distal view of the maxillary 1st molar?

A

All three

49
Q

How far is the bifurcation from the CEJ on the distal?

A

5 mm from the CEJ.

50
Q

Where is the distal contact area located?

A

Middle 1/3

51
Q

How does the distal side of the maxillary 1st molar appear?

A

convex, with a slight concavity on the distal surface of the root from the cervical line to the distobuccal root.

52
Q

How does the distal marginal ridge compare to the mesial marginal ridge?

A

The distal marginal ridge is shorter and less prominent than the mesial.

53
Q

What is more visible from the distal view of the maxillary 1st molar?

A

More of the occlusal surface

54
Q

What is the primary cusp triangle of the maxillary 1st molar?

A

consists of the ML, MB, and DB cusps.

55
Q

Is the DL cusp part of the primary cusp triangle?

A

No

56
Q

Where is the Cusp of Carabelli located?

A

located on the lingual surface of the ML cusp.

57
Q

Is the 5th Carabelli cusp functional?

A

No function

58
Q

How does the size of the cusps rank on the maxillary 1st molar?

A

The size of the cusps from largest to smallest is: ML > MB > DB > DL > 5th.

59
Q

Which is the largest (tallest and largest) cusp in the mouth?

A

Mesiolingual cusp

60
Q

What roots are visible from the mesial proximal view of the maxillary 1st molar?

A

The MB and palatal roots are visible.

61
Q

How do the roots project in relation to the crown in the proximal view of the maxillary 1st molar?

A

The roots project out past the confines of the crown.

62
Q

How do the roots appear from the facial and lingual views of the maxillary 1st molar?

A

“pliered-handled”

63
Q

How does the lingual root appear in the maxillary 1st molar?

A

The lingual root is very wide mesio-distally.

64
Q

How do the roots align with the crown from the facial and lingual views?

A

The roots are within the confines of the crown from these views.

65
Q

What are the functional cusps?

A

Lingual upper and buccal lower

66
Q

What are functional cusps also known as?

A

Stamp cusps

67
Q

What are the nonfunctional cusps?

A

Buccal upper and lingual lower (BULL)

68
Q

Does the max 1st molar have a trifurcation?

A

Yes

69
Q

Which tooth is wider lingually than buccally, resulting in a smaller lingual embrasure than facial embrasure?

A

Maxillary first molar.

70
Q

What are the tooth numbers for the maxillary 1st molars?

A

3, #14

71
Q

What is the largest to smallest furcation to CEJ measurement

A

5mm Distal
4mm Buccal
3mm Mesial

oral anatomy (9 decks)

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