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Oral Anatomy > Maxillary First Molar > Flashcards

Maxillary First Molar Flashcards

1
Q

Permanent maxillary 1st molar is the ____ tooth in the maxillary arch

A

largest

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2
Q

It develops from ____ lobes, has a large

crown and ______ well-formed roots.

A

five , three

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3
Q

The tooth has ____ well-developed cusps and a ____ small supplemental cusp

A

four, one

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4
Q

The four cusps are

A

mesiobuccal, distobuccal, mesiolingual and the dentolingual.

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5
Q

The small, non-functional cusp found

______ to the mesiolingual cusp, is called the _____ or simply as the fifth cusp

A

lingual, ‘cusp/tubercle of Carabelli’

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6
Q

The three roots are

A

mesiobuccal,

distobuccal and lingual.

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7
Q

The _____ root is the longest among

the three roots.

A

lingual

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8
Q

Buccal Aspect

what is the geometric shape of the crown?

A

trapezoidal shape with the shorter uneven side towards the cervical portion.

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9
Q

Buccal Aspect

mesial contact area?
distal conatct area?

A

occlusal third of the crown.

middle third of the crown

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10
Q

Buccal Aspect

The cusp slopes of mesiobuccal cusp make an ________, whereas the cusp slopes of distobuccal cusp meet at _____

A

obtuse angle, right angle

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11
Q

Buccal Aspect

What cusps are visible from the buccal aspect

A

All the cusps (most of the buccal cusps and part of lingual cusps)

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12
Q

Buccal Aspect

The _____ cusp is widest but the _____ cusp
is more pointed.

A

mesiobuccal, distobuccal

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13
Q

Buccal Aspect

The____________ separating the buccal cusp runs for half the length of the buccal surface and ends in the buccal pit.

A

buccal developmental groove

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14
Q

Lingual aspect

geometric shape?

A

trapezoidal

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15
Q

LIngual Aspect

Mesial outline -
distal outline

A

mesial outline - straight

distal outline - semicircular arc

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16
Q

LIngual Aspect

what cusps can be seen?

A

only lingual cusps, as the shorter buccal cusps are obscured.

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17
Q

LIngual Aspect

The _____ cusp is much larger than the ______
cusp which is smooth and spheroidal.

A

mesiolingual, distolingual

18
Q

LIngual Aspect

The ______________ separating the two
lingual cusps is confluent with the distolingual cusp

A

lingual development groove

19
Q

LIngual Aspect

A _________________ begins at the center of
lingual surface just cervical to the lingual developmental groove and extends beyond the cervical line onto the
lingual surface of the lingual root to fade out at the middle third of the root.

A

developmental depression

20
Q

Mesial Aspect

geometric shape?

A

It is trapezoidal like proximal aspect of all

maxillary posteriors with a shorter uneven side towards the occlusal portion.

21
Q

Mesial Aspect

Height of lingual contour

A

middle third of the

crown

22
Q

Mesial Aspect

what cusps are seen from this aspect?

A

The mesiobuccal, mesiolingual and fifth cusps are seen

from mesial aspect.

23
Q

Mesial Aspect

mesial contact area

A

at the junction of occlusal and
middle third of the crown and is more buccally placed
buccolingually.

24
Q

Distal Aspect

geometric shape

A

trapezoidal

25
Q

Distal Aspect

whats cusps are seen form this aspect?

A

Only distobuccal and distolingual cusps are seen from

distal aspect

26
Q

Distal Aspect

The distal surface is ______ than the mesial surface as the crown tapers towards distal aspect

A

narrower

27
Q

Distal Aspect

distal contact area

A

at the center of the crown both cervico-occlusally and buccolingually.

28
Q

Occlusal Aspect

geometric shape

A

rhomboidal with two acute angles and two obtuse angles.

-ts sides are not equal

29
Q

Occlusal Aspect

The two acute angles are—_________ & ______
•• Two obtuse angles are— _______ & ______

A

mesiobuccal and distolingual

distobuccal and mesiolingual

30
Q

Occlusal Aspect

The buccolingual dimension of the crown is _______ than
the mesiodistal dimension by about 1 mm

A

greater

31
Q

Occlusal Aspect

The mesiodistal dimension of the crown lingually is
______ than its mesiodistal dimension buccally. In other
words, the crown does not show lingual convergence
which is generally seen in most permanent teeth.

A

greater

32
Q

Maxillary Molar Primary Cusp Triangle

the maxillary molars have only three primary cusps namely:

A

mesiobuccal, the distobuccal and the mesiolingual

33
Q

Maxillary Molar Primary Cusp Triangle

The distolingual cusp becomes progressively ____ on
2nd and 3rd maxillary molars

A

smaller

34
Q

Maxillary Molar Primary Cusp Triangle

A triangular outline can be visualized by tracking the cusp
ridges of three primary cusps:

A

the mesial marginal ridge and oblique ridge

35
Q

the triangular arrangement of the three primary cusps is characteristic of all maxillary molars and is called as the

A

maxillary molar primary cusp triangle

36
Q

The occlusal surface in the center of occlusal aspect in

bounded by:

A
  • Mesial and distal cusp ridges of four major cusps

- Mesial and distal marginal ridges.

37
Q

The cusps in the decreasing order of size are:

A 
–– Mesiolingual (largest cusp)
–– Mesiobuccal
–– Distobuccal
–– Distolingual
–– Fifth cusp.
38
Q

formed by the union of the triangular
ridge of the distobuccal cusp and the distal ridge of the
mesiolingual cusp

A

oblique ridge

39
Q

The developmental grooves found at the occlusal surface are:

A
  • • The buccal developmental groove
  • • The central developmental groove
  • • The transverse groove of oblique ridge
  • • Distal oblique groove
  • • Fifth cusp groove
  • • Multiple supplemental grooves.
40
Q

runs buccally from the central
pit located in the central fossa and continuous onto the buccal
surface of the crown separating the two buccal cusps.

A

Buccal developmental groove

41
Q

runs in a mesial direction
and ends at the apex of mesial triangular fossa where it is
joined by supplemental grooves. This groove separates the
triangular ridges of mesiobuccal and mesiolingual cusps.

A

Central developmental groove

42
Q

runs in a distolingual
direction from the central pit and crosses the oblique ridge to
reach the distal fossa.

A

Transverse groove of oblique ridge:

Oral Anatomy (9 decks)

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