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Oral Anatomy > PreMolars > Flashcards

PreMolars Flashcards

1
Q

Class Traits of Premolars that are similar to Anterior teeth

A

Crown Tapers narrower towards the CEJ
Crown tapers narrower towards the lingual
CEJ follows the same curvature but less pronounced
Roots taper apically and lingually
Distal contact is more cervical than mesial contact

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2
Q

What tooth in the mouth has a mesial contact that is more cervical than the distal?

A

Mandibular first premolar

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3
Q

what is the only premolar that is likely to have 2 lingual cusps?

A

Mandibular second premolar

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4
Q

Direction of marginal ridges in premolars?

A

Horizontal

Except: mandibular firs premolar that has a marginal ridge at an angle.

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5
Q

facial height of contour for premolars

A

Cervical third (but further away from the CEJ compared to mandibular first which has a crest of curvature very close to the CEJ)

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6
Q

Lingual Crest of curvature

A

middle third

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7
Q

proximal areas

A

located more cervical than anterior teeth crest of curvature and broader.
Mesial is always more occlusal than distal
Except: mandibular first that has a distal more occlusal than mesial

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8
Q

Crown outline shape for all premolars

A

Pentagon outline

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9
Q

Size of mesial and distal cost ridges

A

Mesial cusp ridge is shorter than distal cusp ridge.

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10
Q

length of cusps

A

buccal cusp is LONGER than lingual cusp

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11
Q

lingual cusp position

A

lingual cusp leans to the mesial side (important for determining left vs. right)

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12
Q

which marginal ridge is more occlusal in premolars?

A

Mesial marginal ridge is more occlusal than the distal marginal ridge. (Ex: mandibular 1st premolar)

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13
Q

from the occlusal view, the occlusal table is bound by what structures?

A

marginal ridges and cusp ridges.

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14
Q

from an occlusal view, a premolar is wider in what directions?

A

premolars are wider facia-lingual than messy-distal from an occlusal view

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15
Q

contact areas from an occlusal view

A

Mesial contact is more buccal

Distal contact is more towards the lingual but WILL NEVER extend to the lingual third

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16
Q

which embrasure space is larger when looking at an occlusal view

A

Lingual (because the crown is narrower towards the lingual)

17
Q

between what two teeth is the largest embrasure space in the entire mouth?

A

largest embrasure in the entire mouth is between the maxillary lateral incisor and the canine

18
Q

triangular ridges join to form what structure?

A

transverse ridges

19
Q

what premolar doesn’t really have a central groove?

A

mandibular first premolar

20
Q

Traits that differ mandibular premolars from maxillary premolars

A

Lingual tilt: mandibular premolar crown tilt lingually while maxillary crown are straight in the same axis as the root.
Buccal Ridge prominence: in mandibular teeth is less prominent than maxillary
Crown proportions: maxillary premolars are more rectangular and mandibular premolars are more closer to equal dimensions

21
Q

which maxillary premolar is larger?

A

maxillary first premolar

22
Q

which premolar has wide shoulders?

A

maxillary first premolar

23
Q

which premolars has a mesial cusp ridge that is LARGER than the distal cusp ridge? this is very rare

A

Maxillary first premolar

24
Q

between maxillary first and second premolars, which has the sharpest buccal cusp?

A

maxillary first

25
Q

which premolar is known for having 2 roots?

A

maxillary first premolar

26
Q

describe the roots of the first maxillary premolar

A

two roots / 1 buccal and 1 lingual / buccal root leans distal and is longer / lingual root is shorter and straight

27
Q

on maxillary first premolar, which cusp is larger?

A

buccal cusp is noticeably larger than lingual cusp

28
Q

on maxillary premolars, which direction does the lingual cusp point to?

A

mesial

29
Q

what is the largest crown ration in the maxillary arch?

A

second premolar

30
Q

what is the smallest crown ration in the maxillary arch?

A

maxillary central incisor

31
Q

what is a distinguishing characteristic for maxillary first premolar?

A

it has a crown depression which is always on the mesial side. this concavity is not present on any other tooth

32
Q

what is the lingual height of contour for maxillary premolars?

A

middle third

33
Q

which premolar has a mesial marginal ridge?

A

maxillary first premolar

34
Q

which premolar is the only premolar to have a mesial root depression more pronounced than a distal root depression?

A

maxillary first premolar

35
Q

what is the only premolar that is likely to have 3 cusps?

A

mandibular second premolar

Oral Anatomy (1 decks)

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