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Dental Anatomy & Occlusion > Molars > Flashcards

Molars Flashcards

1
Q

When drawing a line through the cusp tips, the ___ teeth form an arc and the ___ teeth form a straight line.

A

Anterior

Posterior

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2
Q

The lingual cusp line can be extended through the lingual cusp tips of the ___ teeth.

A

Maxillary posterior

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3
Q

The buccal cusp line can be extended through the buccal cusp tips of the ___ teeth.

A

Mandibular posterior

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4
Q

The lingual cusp line is for the ___ posterior teeth while the buccal cusp line is for the ___ posterior teeth.

A

Maxillary

Mandibular

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5
Q

Molar crowns are longer ___ than ___.

A

Mesiodistally

Occluso-cervically

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6
Q

Which molar’s crown tapers from the lingual to the buccal?

A

Maxillary first molar

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7
Q

Generally, molar crowns taper from ___ to ___.

A

Buccal to lingual

Mesial to distal

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8
Q

Molar crown height on the mesial is ___ than on the distal.

A

Longer

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9
Q

What is the functional cusp on maxillary teeth?

A

Lingual cusp

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10
Q

The ___ cusps of maxillary premolars occludes with the ___ of antagonist.

A

Lingual

Distal fossa

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11
Q

The mesiolingual cusp of maxillary molars occludes with the ___ of antagonist.

A

Central fossa

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12
Q

The distolingual cusp of maxillary molars occludes with the ___.

A

Distal marginal ridge of antagonist and mesial marginal ridge of distal tooth

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13
Q

What is the working cusp of mandibular teeth?

A

Buccal cusp

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14
Q

The buccal cusps of premolars and mesial buccal cusps of mandibular molars occludes with the ___.

A

Marginal ridges

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15
Q

The distal buccal cusps of mandibular molars occludes with the ___.

A

Central fossa of antagonist

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16
Q

The mandibular molars have ___ roots. How does this compare to maxillary molars?

A

2 (mesial, distal)

Maxillary molars have 3 roots

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17
Q

The ___ root of mandibular molars is longer and curved. How does this affect extraction?

A

Mesial, more likely to break during extraction

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18
Q

Mandibular molars are longer ___ than ___. Compare this to maxillary molars.

A

M-D than B-L (longer than they are wide)

Maxillary molars are wider than they are long

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19
Q

What is the largest tooth in the mandibular arch?

A

Mandibular 1st molar

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20
Q

The mandibular 1st molar has ___ cusps and ___ roots.

A

5, 2

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21
Q

What teeth are formed from 5 lobes?

A

Mandibular 1st molar, 2nd molar, and maxillary 1st molar

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22
Q

Describe the roots of the mandibular first molar

A

2 wide roots
Mesial root: curves distally
Distal root: straighter

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23
Q

The crown of the mandibular first molar is ___ than it is ___.

A

Longer (M-D), tall (cervico-occlusally)

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24
Q

How can you differentiate the mandibular first and second molar occlusally?

A

The manidbular first molar has a small distal cusp (5 cusps) that disappears for mandibular 2nd molar (4 cusps)

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25
Q

The mandibular first molar has ___ developmental grooves. Name them.

A 
4
Central
Mesiobuccal 
Distobuccal
Lingual
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26
Q

The mandibular first molar has ___ fossa. Name them.

A

3
Central (major) fossa
Mesial and buccal (minor) fossae

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27
Q

The central groove of the mandibular first molar extends between the mesial and distal fossae only. T/F

A

False, the central fossa ends at the mesial fossa but extends past the distal fossa

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28
Q

The mandibular first molar’s largest cusp is ___ and the smallest cusp is ___.

A

Mesial buccal

Distal

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29
Q

Which cusps (buccal or lingual) of the mandibular first molar are taller? Why?

A

Lingual

Buccal cusps are flat since they are functional for grinding food

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30
Q

Lingually, you can see all 5 cusps of the mandibular first molar. T/F

A

False, the lingual cusps are taller than the buccal

Can see all 5 cusps from the buccal view

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31
Q

The cervical line dips down on all ___ teeth.

A

Buccal

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32
Q

What grooves can be seen from the buccal aspect of the mandibular first molar?Which one is longer?

A

Mesiobuccal and distobuccal (longer)

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33
Q

Which side (lingual or buccal) of the mandibular first molar is the most prone to carries? Why?

A

The buccal side

The MB and DB grooves end in depressions that extend to the root, making them difficult to clean (lingual developmental groove is short, easy to clean)

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34
Q

Why is the mandibular first molar hard to extract?

A

I beam effect: developmental depressions on mesial and distal sides of both roots increases the anchorage into the tissue/bone

Shape of root: mesial root curves mesially then distally (looks like knee) and distal root declines to distal (straighter)

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35
Q

For the mandibular first molar, the buccal HOC is ___ and the lingual HOC is in the ___.

A

Cervical 1/3

Middle 1/3

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36
Q

For the mandibular first molar, there is a large concavity on the ___ root.

A

Mesial

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37
Q

The mandibular second molar has ___ cusps.

A

4

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38
Q

Which is usually bigger: the mandibular 1st or 2nd molar?

A

Mandibular 1st molar

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39
Q

The developmental groove pattern for the mandibular second molar resembles a ___.

A

+

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40
Q

For the mandibular 2nd molar, the ___ cusp is largest and the ___ cusp is smallest.

A

MB=DB

DL

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41
Q

For the mandibular 2nd molar, the buccal HIC is in the ___ and the lingual HOC is in the ___.

A

Cervical 1/3

Middle 1/3

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42
Q

The crowns of mandibular teeth are titled ___.

A

Lingually

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43
Q

There are ___ buccal grooves on the mandibular 1st molar and ___ on the mandibular 2nd molar.

A

2 (MB, DB)

1

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44
Q

For the mandibular second molar, the mesial contact is located in ___ and the distal contact is located in the ___.

A

Junction of occlusal / middle 1/3

Middle 1/3

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45
Q

Which tooth is most likely to be impacted?

A

Mandibular third molar

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46
Q

Mandibular 3rd molars usually have ___ roots and ___ cusps.

A

2 (fusion common)

4

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47
Q

Where is the buccal HOC in all molars? Why?

A

Cervical 1/3

To deflect food

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48
Q

Where is the lingual HOC for all molars?

A

Middle 1/3

49
Q

Where is the mesial contact for all molars?

A

Junction of occlusal and middle 1/3

50
Q

Where is the distal contact for all molars?

A

In middle 1/3

51
Q

Which contact is more cervical for all molars?

A

Distal (in middle 1/3)

52
Q

When do the maxillary first molars erupt?

A

6 years

53
Q

What are the largest and strongest of the maxillary teeth?

A

Molars

54
Q

Maxillary molars generally have ___ roots and ___ cusps.

A

3 (2B, 1L)

4 (2B, 2L)

55
Q

Which tooth tapers lingual to buccal?

A

Maxillary first molar

56
Q

What is the largest tooth in the maxillary arch?

A

Maxillary first molar

57
Q

The maxillary first molar has ___ major cusps.

A

4 (Cusp of Carabelli is a supplemental cusp on ML cusp)

58
Q

The maxillary first molar is ___ than ___.

A

Wider B-L

Long M-D

59
Q

The Cusp of Carabelli is located on what cusp of which tooth?

A

ML cusp of maxillary first molar

60
Q

The molars of the ___ arch are longer (mesiodistally) than they are wide (buccolingually).

A

Mandibular

61
Q

The molars of the ___ arch have 3 roots.

A

Maxillary

62
Q

The maxillary first molars have ___ roots. Describe them.

A 
3
MB (widest), DB, lingual (longest)

The roots are concave in and wrap around the bone, giving them maximum anchorage and making them difficult to get out

63
Q

For the maxillary first molar, the ___ root is the longest and the ___ root is the widest.

A

Lingual

MB

64
Q

The occlusal aspect of the maxillary first molar has a ___ shape.

A

Rhomboidal

65
Q

The maxillary first molar crown tapers ___ to ___ and ___ to ___.

A

Mesial to distal (occlusally and height of crown)

Lingual to buccal

66
Q

What is the largest cusp of the maxillary first molar? Smallest?

A

ML

Carabelli

67
Q

The maxillary first molar has ___ fossae. Identify them.

A

3

Central, mesial, distal

68
Q

The maxillary first molar has a ___ ridge that extends from ___ to ___.

A

Oblique

ML cusp to DB cusp

69
Q

Molars of the ___ arch have oblique ridges.

A

Maxillary

70
Q

Maxillary first molars have ___ buccal grooves.

A

1 (mandibular first molars have 2)

71
Q

Which grooves radiate from the central pit of maxillary first molars?

A

Buccal and central grooves

72
Q

What grooves are seen in maxillary first molars?

A

Buccal
Central
Lingual
Distal

73
Q

For the maxillary first molar, the distal groove is located distally to the ___ and connects to the ___ and ___ grooves.

A

Oblique ridge

Lingual and central grooves

74
Q

For the maxillary first molar, the mesial contact is in the ___ and the distal contact is in the ___.

A

Junction of occlusal 1/3 and middle 1/3

Middle 1/3

75
Q

From buccal aspect of maxillary first molar, the MB root curves ___ and the DB root curves ___.

A

Distally in middle 1/3

Mesially in middle 1/3

76
Q

The maxillary first molar has a developmental groove on the ___ root.

A

Buccal

77
Q

The lingual developmental groove is located more ___. Why?

A

Distally

The ML cusp is larger than the DL cusp

78
Q

For the maxillary first molar, the lingual HOC is in the ___ and the buccal HOC is in the ___.

A

Middle 1/3

Cervical 1/3

79
Q

The mesial marginal ridge of the maxillary first molar curves ___.

A

Cervically

80
Q

The mesial contact of the maxillary first molar is located centrally (buccalingually) of the crown. T/F

A

False, the mesial contact is buccal to the center of the crown

81
Q

From the mesial aspect of the maxillary first molar, the ___ root is wider while the ___ root is longer.

A

MB

Lingual

82
Q

Does the maxillary first or second molar have longer roots?

A

Maxillary second molar (roots are as long or longer than first molar)

83
Q

Does the maxillary first or second molar have a shorter crown (cervico-occlusally)?

A

Maxillary second molar

84
Q

For the maxillary second molar, the ___ cusps are smaller.

A

Distal (DB, DL)

Causes more tapering to distal

85
Q

For the maxillary second molar, the lingual root apex is centered over the ___ from lingual aspect.

A

DL cusp (slight deflection to distal)

86
Q

Is the maxillary second or first molar wider (B-L)?

A

First and second molar are same width

87
Q

What shape does the maxillary third molar have occlusally?

A

Heart-shaped

88
Q

From facial/lingual view, all teeth have crown shaped like a ___.

A

Trapezoid (short side at the gingival)

89
Q

From proximal view, the crown of maxillary posterior teeth is shaped like a ___.

A

Trapezoid (long side at gingival)

90
Q

The crown of mandibular posterior teeth is shaped like a ___.

A

Rhombus

91
Q

The roots of all teeth incline ___ except for the ____.

A 
Distally
Mandibular canine (may incline mesially)
92
Q

How many pulp horns does a maxillary first molar have?

A

5 (# of cusps = # of horns)

93
Q

The CEJ dips deeper on teeth of the ___ arch.

A

Maxillary

94
Q

Do anterior or posterior teeth have a deeper cervical line?

A

Anterior

95
Q

Is the mesial or distal side of a tooth expected to have greater curvature? Which way does it dip?

A

Mesial

Dips occlusally

96
Q

All teeth develop from 4 lobes except..?

A

Mandibular first molar, maxillary first molar (Cusp of Carabelli), and mandibular second premolar (if 2 lingual cusps are present)

Mandibular third molar can have 5 cusps too

97
Q

For all molars, the largest cusp is the ___ supporting cusp.

A

Mesial supporting cusp

ML for maxillary molars
MB for mandibular molars

98
Q

Which tooth has a longer mesial cusp ridge than distal?

A

Maxillary first premolar

99
Q

Which tooth has a mesial marginal ridge developmental groove?

A

Maxillary first premolar

100
Q

What is the longest tooth?

A

Maxillary canine

101
Q

Which tooth has the longest root?

A

Maxillary canine

102
Q

Which posterior tooth has the most symmetrical crown?

A

Maxillary 2nd premolar

103
Q

Which premolar is the narrowest and has the smallest roots?

A

Mandibular 1st premolar

104
Q

Which premolar is the most likely to have only 1 root and 1 canal?

A

Mandibular 2nd premolar

105
Q

Which tooth is the widest facio-lingually?

A

Maxillary first molar

106
Q

Which teeth have the longest cusps?

A

Lingual cusps of mandibular molars

107
Q

What is the longest tooth mesio-distally?

A

Mandibular first molar

108
Q

Which tooth has the shortest crown?

A

Maxillary third molar (shortest overall tooth)

109
Q

What is the shortest cusp in the mouth?

A

DB cusp of the maxillary third molar

110
Q

What is the longest root for the maxillary molars? Mandibular molars?

A 
Palatal root (maxillary) 
Mesial root (mandibular)
111
Q

Which teeth are the most likely to be impacted?

A

Third molars, maxillary canine, mandibular 2nd premolar

112
Q

The proximal contacts of posterior teeth are in the ___ from buccal view and ___ from the occlusal view.

A

Middle 1/3

Slightly buccal from middle of tooth

113
Q

Identify the general traits for crown tapering / size of molars

A
  • -Taper buccal to lingual (except max. first)
  • -Taper mesial to distal occluslly
  • -Crown height tapers mesial to distal
  • -Longer (M-D) than they are tall (occlusocervically)
114
Q

The proximal contacts are ___ to the midpoint of the interproximal surface (faciolingually).

A

Buccal

115
Q

Is the palatal root wider buccolingually or mesiodistally?

A

Mesiodistally

116
Q

Are the buccal roots wider buccolingually or mesiodistally?

A

Buccolingually

117
Q

Is the palatal or buccal roots wider mesiodistally?

A

Palatal roots

118
Q

Is the palatal or buccal roots wider buccolingually?

A

Buccal roots

Dental Anatomy & Occlusion (4 decks)

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