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Dental Morph > maxillary and mandibular premolars > Flashcards

maxillary and mandibular premolars Flashcards

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1
Q

what are the numbers of the right maxillary premolars?

A
  • 1st premolar = #5
  • 2nd premolar = #4
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2
Q

what are the numbers of the left maxillary premolars?

A
  • 1st premolar = #12
  • 2nd premolar = #13
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3
Q

how many cusps do the maxillary premolars have?

A

2 cusps
- lingual cusp = functional cusp
- buccal cusp = non-functional cusp

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4
Q

how many lobes do the maxillary premolars form form?

A
  • 3 buccal lobes
  • 1 lingual lobe
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5
Q

what is the groove called that serves as a demarcation between the buccal and lingual lobes?

A

central developmental groove

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6
Q

for the maxillary first premolar, which cusp arm is longer?

A
  • mesial cusp arm longer and straighter
  • distal cus arm shorter and more curved
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7
Q

where is the buccal height of contour for a maxillary 1st premolar?

A

cervical 1/3

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8
Q

where is the mesial contact located for a maxillary 1st premolar?

A

middle 1/3

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9
Q

where is the distal contact located for a maxillary 1st premolar?

A

middle 1/3 (more cervical than mesial contact)

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10
Q

the middle buccal lobe on a maxillary 1st premolar forms what structure?

A

buccal ridge

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11
Q

when viewed from the lingual, the lingual cusp is 1mm _____ and more pointed than the buccal cusp for a maxillary 1st premolar

A

shorter

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12
Q

for a maxillary 1st premolar, the mesiolingual arm is ______ than the distolingual cusp arm

A

shorter (OPPOSITE of the buccal cusp)

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13
Q

where is the lingual height of contour for a maxillary 1st premolar?

A

middle 1/3

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14
Q

what do the maxillary 1st premolars have that the maxillary 2nd premolars do not?

A

mesial developmental depression/ concavity

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15
Q

how many roots do maxillary 1st premolars typically have?

A

2 roots - buccal and lingual (50% of the time)

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16
Q

what is the relationship between the lengths of the mesiobuccal and distobuccal cusp ridges?

A

mesiobuccal cusp ridge is LONGER than the distobuccal cusp ridge

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17
Q

what is the relationship between the lengths of the mesiolingual and distolingual cusp ridges?

A

mesiolingual cusp ridge is SHORTER than the distolingual cusp ridge

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17
Q

where does the bifurcation typically occur at for a maxillary 1st premolar?

A

1/2 - 2/3 length of root

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17
Q

what is the term for a prominent elevation, triangular in cross section, which extends form the tip of a cusp towards the central portion of the occlusal surface of a tooth (maxillary 1st premolar)?

A

triangular ridge

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18
Q

how many pulp horns and pulp canals does a maxillary 1st premolar have?

A

2 pulp horns and 2 pulp canals

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19
Q

compared to the 1st maxillary premolar, the maxillary 2nd premolar is ______ and more ______

A

smaller and more rounded

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20
Q

for a maxillary 2nd premolar, the mesiobuccal cusp ridge is ______ than the distobuccal cusp ridge

A

shorter

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21
Q

for a maxillary 2nd premolar, the lingual cusp is _______ than the lingual cusp of the 1st premolar

A

longer

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22
Q

where is the mesial contact located for a maxillary 2nd premolar?

A

middle 1/3 (slightly offset to the buccal)

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23
where is the distal contact located for a maxillary 2nd premolar?
middle 1/3 (offset to the buccal)
24
for a maxillary 2nd premolar, the mesial and marginal ridges are ______ compared to the maxillary 1st premolar
wider
25
how many roots does a maxillary 2nd premolar typically have?
1 root
26
where are the heights of contour for a maxillary second premolar?
- mesial = middle 1/3 - distal = middle 1/3 - buccal = cervical 1/3 - lingual = middle 1/3
27
between the two maxillary premolars, which one is larger overall?
1st premolar larger overall
28
what are the numbers of the right mandibular premolars?
- 1st premolar = 28 - 2nd premolar = 29
29
what are the numbers of the left mandibular premolars?
- 1st premolar = 20 - 2nd premolar = 21
30
how many lobes does a mandibular 1st premolar develop from?
4 lobes (3 facial and 1 lingual)
31
how many lobes does a mandibular 2nd premolar develop from?
4 or 5 lobes (3 facial and 1 or 2 lingual)
32
on a mandibular 1st premolar, the mesial slope of the buccal cusp is ______ than the distal slope of the buccal cusp
shorter (opposite of maxillary 1st premolar)
33
where are the mesial and distal heights of contour on a mandibular 1st premolar?
middle 1/3
34
what direction does the root of a mandibular 1st premolar taper towards?
lingual
35
what characteristic of a mandibular 1st premolar demarcates the lingual lobe from the mesiobuccal lobe and separates the mesial marginal ridge from the lingual cusp?
mesiolingual developmental groove
36
what cusp/pulp horn of a mandibular 1st premolar is most at risk during operative procedures?
buccal cusp/ pulp horn
37
from the mesial view, what shape is the mandibular 1st premolar?
rhomboidal
38
where is the buccal cusp tip centered on a mandibular 1st premolar?
centered over the midline of the root
39
where is the buccal height of contour for a mandibular 1st premolar?
junction of the middle and cervical 1/3
40
where is the lingual height of contour for a mandibular 1st premolar?
middle 1/3 (lingual to the outline of the root - overhangs root trunk)
41
what ridge slopes cervically from the buccal to lingual on a mandibular 1st premolar?
mesial marginal ridge
42
what groove separates the mesiobuccal lobe from the lingual lobe on a mandibular 1st premolar?
mesiolingual developmental groove
43
what developmental groove is present on the mesial surface of a mandibular 1st premolar?
deep developmental depression-groove
44
on a mandibular 1st premolar, which marginal ridge is higher (distal or mesial)?
distal marginal is higher above the CEJ than the mesial marginal ridge NOTE - ONLY TOOTH IN WHICH THE MESIAL MARGINAL RIDGE IS AT A LOWER LEVEL THAN THE DISTAL MARGINAL RIDGE
45
where is the distal height of contour located for a mandibular 1st premolar?
in middle 1/3
46
when viewed from the occlusal surface, the mesiobuccal cusp ridge is _______ than the distobuccal cusp ridge for a mandibular 1st premolar
shorter
47
the mesial and distal contacts are centered _______ for a mandibular 1st premolar
buccolingually
48
for a mandibular 1st premolar, the bucal and lingual triangular ridges joined together to form a single ridge called the __________
transverse ridge
49
relationship between the buccal and lingual triangular ridge
buccal triangular ridge > lingual triangular ridge
50
what structure of a mandibular 1st premolar separates the mesial occlusal fossa from the distal occlusal fossa?
transverse ridge
51
what structure of a mandibular 1st premolar separates the mesial marginal ridge from the lingual cusp?
mesiolingual developmental groove
52
how many roots does a mandibular 1st premolar have and in what direction does it curve?
1 root (may be bifurcated - rare) curves distally
53
what are the 2 types of mandibular 2nd premolars?
three cusp type (5 lobes) or two cusp types (4 lobes)
54
a mandibular 2nd premolar resembles a mandibular 1st premolar however the buccal cusp is ______ and less _______
shorter and less pointed
55
on a mandibular 2nd premolar (3 cusp type), the two lingual cusps (mesiolingual and distolingual cusps) are separated by a groove (what is the groove called)?
lingual groove
56
a mandibular 2nd premolar has a present mesiolingual developmental groove (true or false)
false
57
the distal marginal ridge of a mandibular 2nd premolar is at a lower level thus more of the ______ surface is visible from the distal view
occlusal
58
for the three cusp type mandibular 2nd premolar, what is the relationship of sizes between the cusps?
buccal > mesiolingual > distolingual
59
what is the "shape" of a 3 cusp type mandibular 2nd premolar?
Y shape
60
what is the "shape" of a 2 cusp type mandibular 2nd premolar?
H or U shape

Dental Morph (8 decks)

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