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Dental Hygiene: Anatomy > Mandibular 1st Premolar > Flashcards

Mandibular 1st Premolar Flashcards

1
Q

calcify

A

2yrs

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2
Q

erupt

A

10-12yrs

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3
Q

root complete

A

12-13yrs

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4
Q

The lingual cusp is….

A

afunctional (due to how small it is)

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5
Q

Facial view: outline shape

A

pentagonal

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6
Q

Facial view: the crown tapers…

A

lingually

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7
Q

Facial view: height of contour

A

cervical 3rd

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8
Q

Facial view: which cusp ridge is shorter?

A

mesial

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9
Q

Facial view: mesial and distal contact areas

A

junction of occlusal and middle 3rds
*mesial contact slightly more cervical

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10
Q

Facial view: facial cusp

A

-slightly toward mesial (due to longer distal ridge)
-more rounded than canine

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11
Q

Facial view: facial ridge

A

prominent w/ mesiobuccal and distobuccal developmental depressions

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12
Q

Lingual view: lingual cusp

A

smaller, afunctional
offset to mesial
*can see facial cusp from this view
*narrower than facial view

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13
Q

Lingual view: height of contour

A

middle 3rd

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14
Q

Lingual view: mesiolingual developmental groove

A

*identifying feature
-separates MMR from lingual cusp
-originates from mesial pit

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15
Q

Proximal view: outline shape

A

rhomboidal
*lingually inclined

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16
Q

Mesial view: buccal and lingual cusp tip

A

buccal: in line w/ root bisector
lingual: lingual to the root bisector

17
Q

Distal view: CEJ curvature

A

less on the distal

18
Q

Distal view: DMR

A

more developed than the MMR

19
Q

MMR vs DMR

A

MMR is more cervical than the DMR

20
Q

Occlusal view: occlusal table shape

A

triangular (due to small lingual cusp)

21
Q

Occlusal view: transverse ridge

A

only premolar w/ transverse ridge not crossing occlusal development groove
*larger and longer buccal triangular ridge than lingual

22
Q

Occlusal view: MMR

A

shorter than DMR
45 degree angle slope
resembles canine

23
Q

Occlusal view: DMR

A

longer more prominent
more horizontal
not as great slope towards lingual

24
Q

Occlusal view: fossae

A

mesial pit and distal pit

25
Q

Occlusal view: grooves

A

-central
-mesiobuccal
-mesiolingual developmental
-distobuccal
-distolingual
-distal marginal

26
Q

Describe the root

A

single, straight, narrower on lingual, distal curvature, mesial and distal depressions, *shorter than 2nd PM

27
Q

How many canals and pulp horns

A

1 canal, 2 horns

28
Q

If 2 roots are present, which pulp horn is more dominant?

A

buccal pulp horn
*longitudinal groove separates roots on proximal when 2 are present

Dental Hygiene: Anatomy (28 decks)

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