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DENT 1520/1521 > Tooth Morphology > Flashcards

Tooth Morphology Flashcards

1
Q

Shape of Teeth from labial/facial view

A

All trapezoid except 3rd molars are bulbous

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2
Q

Maxillary Incisors #

A

Central - 8, 9

Lateral - 7, 10

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3
Q

Maxillary Incisor function

A

Shear food, esthetics, phonetics

space and guide for primary teeth

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4
Q

Line angles

A

Where two tooth surfaces meet

to name: mesial/distal followed by facial/lingual or incisal/occusal

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5
Q

Proximal contact

A

-where the height of contour on the proximal surfaces of the teeth touch an adjacent tooth
-stabilize dental arch
-prevent food from packing between teeth
protects gingival papilla

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6
Q

Embrasure

A

spaces created by contour of adjoining teeth beginning at the contact area

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7
Q

PC of 8 and 9

A

M - incisal 1/3

D - junction of middle and incisal

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8
Q

PC of 24 and 25

A

M - incisal 1/3
D - incisal 1/3

PC at SAME HEIGHT

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9
Q

PC of 7 and 10

A

M - incisal 1/3

D - center of middle 1/3

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10
Q

PC of 23 and 26

A

M - incisal 1/3

D - incisal 1/3 (more cervical)

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11
Q

Greatest curvature of CEJ

A

at the mesial surfaces of 8 and 9

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12
Q

Distal/Mesial Surfaces of incisors

A

All mesial of incisors = straight

Distal:
24 & 25 = slightly rounded
7, 8, 9, 10, 23, 26 = more rounded

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13
Q

Edges of Incisors

A

Maxillary:
Mesial (all) = rounded 90 angle
Distal: rounded

Mandibular:
Mesial (all): sharp
Distal 24 & 25 = sharp
Distal 23 & 26 = rounded

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14
Q

Dimensions of Incisors

A

Central (both) : Cervical-incisal > Mesiodistal

Lateral (both): Faciolingual > mesiodistal

this means that the incisors are taller than they are wider

permanent max central are wider than they are taller #E and #F

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15
Q

Cingulum of Incisors

A 
#8, 9 = prom. distal shift
#7, 10 = prom.centered
#24, 25 = faint centered
#23, 26 = faint distal shift
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16
Q

Marginal ridges on incisors

A 
Prominent = maxillary
faint = mandibular
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17
Q

Lingual Fossa on Incisors

A 
Prominent = maxillary
Faint = mandibular
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18
Q

Incisal Ridge & Edge

A 
#8, 9, 24, 25 = straight
#7, 10 = rounded
#23, 26 = slopes distally
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19
Q

7 and 10 developmental groove

A
  • Lingual surface where the two marginal ridges meet

- possible site of localized periodontal disease

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20
Q

Proximal shape of incisors

A

triangular

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21
Q

HOC in incisors

A

Facial (all) = cervical 1/3

lingual (all) = cervical 1/3

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22
Q

Root bisector of incisors

A 
Maxillary = centered
mandibular = incisal edge is lingual
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23
Q

Incisal view of incisors

A 
#7, 8, 9, 10 = triangular
#23, 24, 25, 26 = diamond
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24
Q

Canine funcion

A

Shear food, ensure normal facial expression, cornerstone of dental arch

longest and most stable teeth in the mouth

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25
Q

Labial view of maxillary canines

A
  • labial ridge with mesial and distal developmental depressions
  • mesial = more incisor like (sharper corner)
  • distal = more premolar like (longer cusp ridge)
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26
Q

PC of 6 and 11

A 
Mesial = junction of incisal and middle 1/3
Distal = center of middle 1/3 (most cervical of any teeth)
27
Q

How many cusps do canines have?

A

1 (only anterior tooth that has a cusp)

28
Q

Functions of Canines

A

Form foundation that ensures normal facial expression, pierce or shear food, corner stone of dental arch and the most stable tooth in the mouth (often used to anchor fixed or removable prosthesis), longest teeth in the mouth

29
Q

Labial view of maxillary canine

A
  • Trapezoidal or pentagonal shape
  • distal cusp ridge is longer than the mesial cusp ridge
  • mesio incisal corner is sharper than the disto incisal corner
30
Q

PC of 6 and 11

A

Mesial: Jxn of middle and incisal 1/3
Distal: middle 1/3 (most cervical PC of anterior teeth)

*centered faciolingually on both mesial and distal

31
Q

Lingual view of maxillary canine

A
  • well developed cingulum
  • lingual ridge from cusp tip to cingulum
  • lingual ridge divides the lingual surface
  • mesial and distal fossa on either side of the lingual ridge
  • well developed marginal ridges
32
Q

Proximal view of maxillary canines

A
  • Facial HOC in cervical 1/3
  • Lingual HOC at cingulum
  • triangular shape when viewed
  • cusp tip is labial to root bisecting line
  • distal surface has concavity apical to PC (more concave than mesial aspect)
33
Q

incisal view of maxillary canine

A
  • wider FL than MD
  • cusp tip is toward the labial and mesial
  • crown has a slight depression distal to labial ridge
  • centered cingulum
34
Q

Root form of maxillary canines

A
  • maxillary canine is longest tooth in dentition
  • root is FL>MD
  • root form contributes to canine emergence
  • single root and canal
  • root depressions on mesial and distal (distal is deeper)
  • ovoid canal at cervical and circular at mid root cross section
35
Q

Labial view of Mandibular canine

A
  • trapezoidal shape
  • narrower MD than maxillary canine
  • mesial outline is straight
  • M crown outline is almost continuous with the root
  • APPEARS longer than maxillary canines (not actually longer)
  • M cusp ridge is much shorter than distal cusp ridge (approx 1/2 length)
  • mesial cusp ridge is almost horizontal while distal slopes cervically more
36
Q

PC of 22 and 27

A

Mesial: incisal 1/3
Distal: Jxn of incisal and middle 1/3

37
Q

Lingual view of Mandibular Canine

A
  • less prominent marginal ridges AND lingual ridges than maxillary
  • cingulum is not prominent and slightly towards distal
38
Q

Proximal view of Mandibular Canines

A
  • crown is triangular shaped
  • crown + root are crescent shaped
  • cusp tip is lingual to root bisecting line
  • PC is centered faciolingually
39
Q

Incisal view of Mandibular Canines

A
  • FL>MD
  • diamond shaped crown
  • Mesio facial is convex while disto facial is concave (or flat)
40
Q

Mandibular canine Root Form

A
  • shorter than maxillary canine (by 1-2 mm)
  • longest tooth in mandible
  • root is narrower lingually than facially (tapers toward lingual)
  • M and D root depressions (D is deeper)
  • MAY have bifurcated roots
  • ovoid or hourglass shaped canal
41
Q

Labial view of Primary maxillary canines

A

C and #H

  • diamond shape crown
  • sharp cusp
  • MESIAL CUSP RIDGE IS LONGER THAN THE DISTAL CUSP RIDGE AND CUSP TIP IS DISTAL TO CENTER OF CROWN (opp for permanent)
  • PC are at the same level M and D
42
Q

Lingual view of primary maxillary canines

A

-pronounced cingulum, lingual ridge, and marginal ridges

43
Q

Incisal View of primary maxillary canines

A

-diamond shaped

44
Q

Primary maxillary canine root form

A
  • root is twice the length of the crown

- root curves toward the labial in the apical 1/3

45
Q

Labial view of primary mandibular canines

A

M and #R

  • crown is shorter than primary maxillary canine but similar shape
  • distal cusp ridge is longer than mesial cusp ridge (allows for proper intercuspation during mastication)
46
Q

Primary canine comparison

A
  • max has a longer root than mandibular
  • max have more prominent lingual anatomy than the mandibular
  • mand are more concave on lingual surface than max
  • man is smaller FL and Inciso gingivally
47
Q

Premolar function

A
  • transition btw anterior and molars
  • only class of teeth which replace a different class of teeth (replace primary molars)
  • mastication and assist in shearing
  • keep mouth from sagging
  • esthetics
  • bicuspids
48
Q

Buccal view of maxillary 1st premolars

A

5 and #12

  • trapezoid in shape
  • buccal cusp is long and prominent
  • buccal ridge from cusp tip to cervical margin
  • M and D developmental depressions
  • MB cusp ridge is longer than the distal cusp ridge
  • MB cusp ridge can be concave
  • DB cusp ridge is shorter and more curved than mesial
  • cusp tip is slightly distal to mid root axis
49
Q

PC of 5 and 12

A

Mesial: Jxn of occlusal and middle 1/3
Distal: middle 1/3

**concavity gingival to the contact area on the mesial

50
Q

Lingual view of maxillary 1st premolar

A
  • lingual cusp is narrower and smaller than buccal cusp

- lingual cusp is shifted toward the mesial

51
Q

Mesial view of maxillary 1st premolar

A
  • trapezoid in shape
  • buccal cusp is ~1mm longer than lingual
  • concavity cervical to the contact area and extends onto the mesial root surface
  • mesial marginal ridge developmental groove
52
Q

Proximal view of maxillary 1st premolar

A
  • trapezoid in shape
  • mesial marginal ridge developmental groove
  • buccal HOC in cervical 1/3
  • lingual HOC in middle 1/3
  • distal marginal ridge is more cervical than mesial marginal ridge
  • no developmental groove on distal aspect
53
Q

Occlusal view of maxillary 1st premolar

A
  • hexagonal
  • 2 cusps
  • buccal cusp is larger than lingual and lingual is shifted mesially
  • distinguishing feature: groove extending over mesial marginal ridge
  • M and D triangular fossae
  • M and D pits
54
Q

Mesial pit of maxillary 1st premolar is the junction of ____________

A
  1. ML triangular groove
  2. MB triangular groove
  3. Central Groove
  4. Mesial Marginal groove
55
Q

Distal pit of maxillary 1st premolar is the junction of ____________

A
  1. DB tri groove
  2. DL tri groove
  3. Central Groove
56
Q

PC of 5 and 12 from occlusal

A

Mesial: jxn of buccal and middle 1/3
Distal: buccal to the center of tooth (larger in size than mesial contact)

**both are facial to the faciolingual center of the crown

57
Q

Root form of maxillary 1st premolar

A
  • 2 or 3 roots
  • long root trunk
  • measurement btw buccal and lingual cusp tip is less than the measurement of the root at the cervical area
  • buccal cusp tip is located in line with the arex of the buccal root (same for lingual)
58
Q

Root trunk

A

area of the root apical to the CEJ up to where bi/trifucation where the root splits

59
Q

Buccal view of maxillary 2nd premolar

A
  • buccal cusp is shorter than 1st and more rounded (offset toward the mesial)
  • closely resembles 1st premolar
  • mesial cusp ridge is shorter than distal cusp ridge
60
Q

PC of 4 and 13

A

Mesial:jxn of occlusal and middle 1/3
Distal: middle 1/3 (more cervical)

61
Q

Lingual view of maxillary 2nd premolar

A

-lingual cusp is almost as large as the buccal cusp

62
Q

Mesial view of maxillary 2nd premolar

A
  • NO MESIAL CONCAVITY
  • B and L cusps are almost the same size
  • trapezoidal in shape (long end of trap near cervical side)
  • B HOC in cervical 1/3
  • L HOC in middle 1/3
63
Q

Occlusal view of maxillary 2nd premolar

A
  • round or ovoid shape
  • central groove is shorter than that of 1st premolar
  • no mesial groove
64
Q

Mesial view of maxillary 2nd premolar

A
  • Buccal HOC in cervical 1/3

- lingual HOC in middle 1/3

DENT 1520/1521 (1 decks)

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