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Dental Hygiene: Anatomy > Maxillary 1st Premolar > Flashcards

Maxillary 1st Premolar Flashcards

1
Q

List the functions of premolars

A

-mastication
-assisting molars in grinding and canines in tearing
-maintain vertical dimensions of the face
-support corners of mouth and cheeks

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2
Q

when do the mx 1st premolars calcify?

A

1.5 yrs

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3
Q

when do the mx 1st premolars erupt?

A

10-11yrs

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4
Q

when do the mx 1st premolars root complete?

A

12-13yrs.

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5
Q

The facial view outline shape is…

A

pentagonal

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6
Q

Compared to the canine, mx 1st premolars are…

A

-shorter
-narrower mesiodistally
-sharper mesial and distal marginal ridges

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7
Q

Facial view height of contour

A

cervical 3rd

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8
Q

Facial view mesial outline

A

-concave from the contact area to the cervical line
-prominent mesiocclusal angle

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9
Q

Facial view distal outline

A

similar to mesial but no concavity

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10
Q

mesial contact area

A

middle 3rd

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11
Q

distal contact area

A

middle 3rd (but more cervical than mesial)

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12
Q

crown surface

A

convex

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13
Q

Facial View: the cusp tip is offset to the…

A

distal

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14
Q

Mesial cusp ridge

A

longer and straighter
may have slight concavity
BEING LONGER IS UNIQUE TO MX 1st PM

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15
Q

Distal cusp ridge

A

shorter and more convex

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16
Q

Facial ridge

A

-extends from facial cusp to cervical line
-extremely well developed*
-result of middle facial lobe
-depressions on each side

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17
Q

The crown tapers towards the…

A

lingual

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18
Q

The lingual surface is…

A

smooth and convex
*NO lingual ridge

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19
Q

Which cusp is shorter, lingual or buccal?

A

lingual by 1-1.3mm

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20
Q

Lingual view: the cusp tip offsets to the…

A

mesial

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21
Q

Which slope is short, the mesial lingual or the mesial facial

A

mesial lingual is shorter

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22
Q

Lingual view height of contour

A

middle 3rd

23
Q

Lingual view mesial cusp ridge

A

shorter than the distal, small portion of buccal cusp can be seen from lingual view

24
Q

The proximal outline shape of the mx 1st premolar is…

A

trapezoidal

25
Q

Proximal view: the cusp tips are _____ over the root

A

centered; within the confines of the root*

26
Q

Proximal view: CEJ

A

cervical line less curved on distal compared to mesial

27
Q

Mesial marginal ridge groove

A

crosses well developed MMR and continued onto to root
*not always present
*special considerations when scaling

28
Q

Mesial developmental depression

A

on middle portion of cervical 3rd of crown, continues onto root across the CEJ, joining the developmental depression of the root
*usually quite prominent

29
Q

Distal proximal view

A

-no grooves crossing the DMR
-no developmental depression
-more rounded and smooth

30
Q

What is the occlusal outline shape of the mx 1st premolar

A

hexagonal

31
Q

Occlusal view: the crown is wider on which surface, buccal or lingual

A

buccal

32
Q

Occlusal view: the crown is wider…

A

buccolingually than mesiodistally

33
Q

Occlusal view: distal proximal contact

A

facial to the mesial contact

34
Q

Occlusal view: mesial proximal contact

A

lingual to the distal contact

35
Q

Occlusal view: lingual vs facial cusp

A

lingual: more pointed
facial: larger wider and longer

36
Q

Occlusal view: name the 4 cusp ridges

A

facial, lingual, distal, mesial

37
Q

Occlusal view: triangular ridges

A

runs from cusp tip to central groove
*eventually join to form a transverse ridge

38
Q

Occlusal table

A

area bounded by the perimeter of the ridges

39
Q

Mesial marginal ridge

A

shorter than the DMR, located more occlusal than the DMR
has MM groove running through it

40
Q

On the facial cusp, which cusp ridge is longer?

A

mesial facial is longer than distal facial

41
Q

Name the developmental grooves of the mx 1st premolar

A

sharp deep and V shaped
-central
-mesial marginal
-mesiobuccal developmental
-distobuccal development

42
Q

Name the 2 fossae

A

mesial triangular fossa
distal triangular fossa

43
Q

Compared to the 2nd PM, there are _____ secondary/supplemental grooves

A

fewer

44
Q

Name the developmental pits

A

mesial- intersection of MB, ML, MM, and central grooves
distal- intersection of DB, DL and central grooves

45
Q

The lingual surface of the root is ______ than the buccal

A

narrower

46
Q

mesial view of root

A

-deep depression
-mesial marginal groove continues with mesial depression

47
Q

distal view of root

A

-convex or flat near cervical
-not as deep depression as on mesial

48
Q

which type of root is more common, single or bifurcated?

A

bifurcated (1 buccal 1 lingual)

49
Q

what is the root trunk?

A

the area between cervical line and point of furcation

50
Q

number of pulp horns=

A

number of cusps

51
Q

Type I root

A

-single root w/ deep mesial groove
-usually 2 root canals w/ 1 apical foramen
-2 pulp horns

52
Q

Type II root

A

bifurcated- facial and lingual
-bifurcation apical to the 1/2
-facial roots longer and larger
-hardest to do root canal treatment

53
Q

Type III root

A

laminated (fused) roots- buccal and lingual joined

54
Q

Comparisons with anterior teeth

A

-greater faciolingual than mesiodistal
-mesial and distal contact areas broader and closer to same level on the tooth
-less mesial and distal curvature of cervical line
-shorter crowns

Dental Hygiene: Anatomy (28 decks)

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