Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Dental Morphology > premolars > Flashcards

premolars Flashcards

1
Q

secondary dentiion

at what age do maxillary and mandibular first premolars erupt?

max and mandibular premolars erupt together for the same tooth type

A

10-11

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

1.

at what age do mx and mn second premolars erupt?

what’s so special about this age?

A

11-12

maxillary canines erupt at this age range too

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

fdi notation of first premolars

A

14, 24, 34, 44

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

universal number of first premolars

A

5, 12, 21, 28

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

universal number of second premolars

A

4,13, 20, 29

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

fdi notation of second premolars

A

15,25, 35, 45

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

dimensions

what’s so special abt md of mn 2nd premolar?

A

root length > crown length
facial and lingual root length of the mx first pm is identical
OC > MD

FL > OC in maxillary premolars
FL< OC in mn first premolar FL = IC in mn second premolar
FL>MD in all premolars thicker than wide

mn second premolar: lingual MD > facial MD

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Crown outline forms

facial, mesial and distal

A

facial: pentagonal
m/d: trapezoidal for mx, rhomboidal for mn
**rhomboidal mn first premolar has substantial lingual tilt **

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

crown outline form

occlusal view

A

mx first pm: hexagonal
mn second pm: ovoid
mn first pm: diamond/rhomboidal
mn second pm: square

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

facial view

mx cusp ridges

A

mx first pm: mesial cusp ridge > and straighter than distal cr w 100-120 deg angle
mx second pm: distal cusp ridge > mesial cusp ridge w 125-130 angle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

mn cusp ridges

A

mn first premolar: distal cr > mesial cr different from mx first pm w 100-120 deg angle same as mx first pm
mn second pm: 130 deg angle same as mx second pm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

mx first pm cusp tip

A

offset slightly distal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

mn first pm cusp tip

A

facial cusp relatively sharp offset slightly to mesial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

sharpness of mn second pm

A

relatively blunt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

facial view

mesial and distal prox contacts of mx pm

A

mx first and second pm mc: junction of occlusal and middle third
mx first and second pm dc: middle third

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

facial view

mesial and distal prox contacts location of mn premolars

A

mn first pm mc and dc: middle third
mn second pm mc and dc: jkunction of occlusal and middle third

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

facial view

cervical line form

A

evenly convex towards apex in mx premolars
evenly curved and slightly convex in mn first pm
evenly curved, less convex in mn second pm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

which 2 premolars have well developed and relatively prominent buccal (facial) ridges?

how is the facial ridge of mx compared to mn?

A

maxillary first premolar and mandibular first premolar
mx buccal ridge more prominent than mandibular

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

facial developmental depressions

A

mx first pm: m and d facial dev depressions usually present
mx second pm: mesial rarely present (2%), distal sometimes present (25%)
mn first pm: smooth in the occlusal 1/3, mesial likely to be deeper
mn second pm: mostly absent, when present distal likely to be deeper

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

number of roots

A

mx first pm: mostly 2
mx second pm: 1 conically shaped root
mn first and second pm: 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

root curvature

applicable to mx second pm, mn first and second pm

A

mx second pm: distal curvature at apex of root
mn first pm: distal curvature at apex of foot
mn second pm: most of the time distal curvature at apex of root

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

m/d view

occlusal table location

A

mx first pm: centred over root trunk
mn first pm: slopes lingually

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

m/d view

cusp tip position

A

mx first pm: located aligned w the apex of the facial / lingual root
mn first pm: facial cusp centred FL, lingual cusp in line with lingual surface of root
mn second pm: facial cusp at junction of facial and middle third

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

m/d view

cusp heights

A

mx first pm: facial taller and sharper than lingual cusp
mx second pm: facial and lingual cusp nearly same length
mn first pm: facial cusp much taller than lingual cusp

mn second pm: facial cusp taller than the lingual cusp
mn second pm: mesio lingual cusp is longer and taller than distolingual cusp

25
Q

m/d view

marginal ridge groove

grooves are linear depressions, marginal = extend onto mr

A

mx first pm: marginal ridge groove on mesial marginal ridge is very prominent at 2/3 of FL distance, distal marginal ridge rarely has developmental groove crossing it
mx second pm: mesial mr ridge usually absent, distal mr ridge more likely absent

mn first pm: usually no mr groove
mn second pm: usually no mr groove but rarer on distal mr

26
Q

m/d view

marginal ridge anatomy

A

mx first pm: m mr < d mr mesial mr groove present
mx second pm: rare to have m mr
for mx premolars, DISTAL marginal ridge is located more cervically than mesial marginal ridge

mn first pm: m mr more cervical than d mr , d mr more horizontal than m mr
mn second pm: distal mr cervical to m mr, m mr horizontal at right angle to long axis, d mr concave

27
Q

m/d view

triangular ridge angulation

A

mx first pm: facial and lingual tr at 45 deg to occlusal surface
mn first pm: facial tr slopes lingually at roughly 45 deg

28
Q

m/d view

facial and lingual hoc

A

mx first and second pm: facial at cervical third, lingual at middle third
mn first pm: facial at cervical third, lingual at middle third near lingual cusp tip
mn second pm: facial; at cervical third, lingual at occlusal third

29
Q

m/d view

cervical line form

A

mx first pm: curves occlusally, mesial cervical line form may have a small “v” apical extention at midpoint, distal cl form shows less curvature
mx second pm: mesial may be irregular / evenly convex. distal shows less curvature
mn first pm: mesial curves occlusally, distal less curvature
mn second pm: mesial curves occlusal slightly, distal less curvature

notice distal cervical line form is less curved throughout all premolars

30
Q

cervical crown anatomy

A

mx first pm: mesial has cervical developmental depression while distal is flat, no have
mx second pm: both mesial and distal are quite flat, no developmental depressions
mn first pm: mesial surface is either flat or concave distal surface has concavity
mn second pm: mesial has a flat or concave depression

31
Q

m/d view

shape of mesial and proximal contacts

A

mx first pm: mesial prox contact is located facially and circular, distal prox contact is facial and ovoid w larger FL dimension
mx second pm: both m n d prox contacts are facial and ovoid w larger FL dimension
mn first pm: both m n d prox contacts are facial and circular
mn second pm: m prox contact is facial and circular, distal prox contact is facial and ovoid w larger FL dimension same as mx first pm

notice all the contacts are facial

32
Q

what’s so special about the root of mx first pm?

A

it is the only pm with 2 roots most of the time
mx first pm facial root is longer than lingual root

33
Q

m/d view

root surface form

A

mx first pm: mesial root surface has a deeper developmental depression than distal
mx second pm: mesial has developmental root depression most of the time (but not always) and distal will have deeper root dev depression
mn first pm: mesial has developmental depression 45% of the time, distal mostly has deeper root dev depression
mn second pm: mesial is flat or convex most of the time, distal has dev depression most of the time

34
Q

where is the root bifurcation located?

which premolar has 2 roots? (61%)

A

apical third of root

35
Q

occlusal view

mesio facial angle

angle made by the mesiofacio cusp ridge and mesial marginal ridge

A

mx first pm: 90 deg
mx 2nd pm: rounded
mn first pm: acute angle

36
Q

occlusal view

disto facial angle

angle made by distal marginal ridge and distal facial cusp ridge

A

mx first pm: acute angle
mx second pm: rounded
mn first pm: 90 deg same as mx first pm mesiofacial angle

notice mx second pm is always rounded, no info on mn second pm

37
Q

occlusal view

faciopalatal line angles of maxillary first pm

A

more prominent

rmb u tried to give the central incisor more dimension w this

38
Q

occlusal view

facial developmental groove of maxillary first pm

why only maxillary first pm?

A

deep, slight M/D concavities in facial outline

only mx first pm usually got mesial and facial developmental depressions

39
Q

which tooth does not exhibit lingual crown convergence?

A

mx second pm: parallel coz of ovoid occlusal crown form
mn second pm: coz of square occlusal crown form

40
Q

occlusal view

number of cusps

A

2 cusps for mx first pm, second pm, and mn first pm
mn second pm is special
can have 3 mostly (2 lingual) / 2 cusps 43% / 4 cusps 3%

41
Q

occlusal view

any significant features of the facial cusp ridges?

A

mx first pm: distal facial cusp ridge is more facial than mesial facial cusp ridge
mn first pm: both M and D cusp ridges are nearly in a straight line

42
Q

occlusal view

facial triangular ridge of mx first pm

the same as cusp ridge

A

M/D slopes of the facial triangular ridge meet at the crest of ridge at 120 deg

43
Q

presence of lingual triangular ridge in mx first pm

A

seldom prominent

44
Q

occlusal view

fossae

A

mx first pm: mesial and distal triangular fossa are present
mx second pm: mesial and distal fossa, closer to centre of tooth
mn first pm: mesial linear fossa, distal circular fossa is deeper, larger than mesial fossa
mn second pm: mesial and distal fossa + central fossa on 3 cusp tooth (largest)

45
Q

occlusal view

transverse ridge definition

A

where 2 triangular ridges share the same base (facial to lingual / palatal)

46
Q

occlusal view

which tooth has transverse ridge?

premolar

A

maxillary first premolar and mandibular first premolar

47
Q

occlusal view

developmental groove anatomy

A

mx first pm: mesiofacial, distofacial, mesial marginal(most prominent) and central
mn first pm: mesiolingual developmental groove angles in a mesiolingual direction from the Mesial fossa, central groove is crescent shaped
mn second pm: mesial and distal groove in facial direction, lingual groove

48
Q

occlusal view

occlusal pattern of mn second pm

A

Y for 3 cusps
U/H for 2 cusps

49
Q

occlusal view

supplemental groove

A

mx first pm: triangular ridges often flanked by shallow supplemental grooves (2/4)
mx second pm: several supplemental grooves extending from the pits at the depth of each fossa to give a wrinkled appearance

50
Q

lingual view

lingual crown dimension for mx first pm and mn first pm

A

mx first pm: lingual surface is smaller than facial surface
mn first pm: lingual crown is narrower MD than facial

51
Q

lingual view

lingual cusp position

A

mx first pm; offset mesially
mx second pm: mesial to long axis of the root
mn first pm: aligned with facial triangular ridge, lingual cusp offset medially

NA for mn second pm coz 2 lingual cusps

52
Q

lingual cusp form

A

mx first pm: smooth, spheroidal /round
mx second pm: L cusp slightly shorter than F cusp, relatively sharp
mn first pm: small and often pointed

NA for mn second pm

53
Q

surface visibility from lingual aspect

A

mx second pm: proximal surfaces not highly visible
mn first pm: almost all is seen

54
Q

marginal ridge location

A
55
Q

which tooth has a mesiolingual groove?

A

mandibular first premolar, mesiolingual groove separates mesial marginal ridge from lingual cusp

56
Q

lingual view

cervical line form

A

mx first pm: curves symmetrically toward root apex
mx second pm: less curvature
mn first pm: slightly convex in direction of root apex
mn second pm: almost straight

57
Q

which tooth is this applicable to only?

lingual root apex form

A

mx first pm: lingual root apex is blunter than facial root apex and shorter than facial root, lingual root can bend either mesially or distally

58
Q

lingual view

lingual surface form special feature

only applicable to the mn second premolar

A

flattened and grooved occlusally

Dental Morphology (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions