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Dental Anatomy Midterm > Midterm Material > Flashcards

Midterm Material Flashcards

1
Q

how many cusps primary mandibular first molar

A

4

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2
Q

list maxillary molar cusps from largest to smallest

A

ML>MB>DB>DL>Carabelli (only on first molars)

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3
Q

what permanent tooth is the primary maxillary first molar comparable to?

A

maxillary premolar

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4
Q

in y type mandibular second premolar, where is lingual groove?

A

distal to center

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5
Q

how many lobes in molars

A

one lobe per cusp

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6
Q

roots of mandibular second molar

A

sometimes fused to varying degrees with C shaped canal or more like mandibular first molar roots

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7
Q

Compare root:crown of maxillary lateral incisor and maxillary central incisor

A

maxillary lateral incisor has smaller crown in relation to root

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8
Q

how many fossae on maxillary first molar

A

4 (2 major 2 minor)

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9
Q

on a maxillary lateral incisor is the mesial or distal outline from the facial view more curved?

A

mesial outline straighter than distal outline

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10
Q

Which anterior tooth has most pronounced lingual anatomy?

A

maxillary lateral incisor

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11
Q

height of contours mandibular

A

Central, lateral and canine: facial and lingual cervical 1/3

pre and molars: facial at cervical 1/3, lingual at middle 1/3

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12
Q

Which maxillary premolar has a larger occlusal table?

A

maxillary second has larger occlusal table than maxillary first

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13
Q

smallest mandibular molar root

A

distal root of mandibular third molar

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14
Q

describe location of cusp tip on maxillary canine

A

From facial aspect: in line with center of root, mesial to center of crown
from mesial aspect: slightly lingual to center

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15
Q

describe location of cingulum on maxillary canine

A

cingulum centered over root

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16
Q

reasons primary teeth are important (6)

A
  • proper chewing
  • good pronounciation/speech habits
  • normal jaw bone/muscle development
  • spacing of permanent teeth
  • child’s confidence about looks
  • guide permanent teeth eruption placement
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17
Q

on maxillary first premolar where are the heights of contour from an occlusial aspect?

A

both B and L are mesial to center

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18
Q

mammelons on primary incisors?

A

no

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19
Q

Does maxillary or mandibular canine have more prominent lingual anatomy?

A

maxillary canine has more prominent lingual anatomy

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20
Q

Describe buccal cusp and cusp slope of maxillary first premolar

A

mesial ridge longer than distal, so cusp tip offset to distal
form diagonal line since mesial part of cusp slope inclines more lingually

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21
Q

List the cusps of mandibular second premolar in order from tallest to shortest

A

Tallest is buccal, then mesiolingual then shortest is distolingual

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22
Q

pulp chamber shape primary mandibular first molar

A

rectangle (wider mesiodistally)

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23
Q

on mandibular first/second molar are lingual or buccal cusps sharper? which is most blunt?

A

lingual sharper (with MB most dull)

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24
Q

What are the longest teeth in the mouth?

A

canines

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25
Q

MB and DB roots of maxillary (first) molar have what shape?

A

pliers handle (converge at apical third after DB diverges distally initially)

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26
Q

buccal pit mandibular second molar

A

not usually

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27
Q

is the primary maxillary first molar wider mesiodistally or occlusocervically?

A

wider mesiodistally

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28
Q

Compare cusps of maxillary first and second premolars

A

mostly the same but maxillary second has cusps of almost equal size
on second has B and L cusps centered, with B cusp ridges perpendicular to bisecting line

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29
Q

describe lingual cusp of mandibular first premolar

A

cusp tip in line with lingual border of root from mesial aspect
very small in comparison to buccal cusp

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30
Q

From a mesial view of maxillary central incisor, which lingual convexities are visible?

A

All of them

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31
Q

crown taper of mandibular third molar

A

tapers distally

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32
Q

describe lingual cusp separation in maxillary (first) molar

A

cusps separated by distolingual groove which may end in lingual pit in center portion of lingual surface

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33
Q

What shape crown does a mandibular first premolar have from buccal aspect?

A

bell shaped

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34
Q

what tooth is considered the cornerstone to development of occlusion?

A

permanent first molars

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35
Q

root cervical cross section shape mandibular second molar

A

wider on mesial than distal to make roughly rounded arrowhead shape

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36
Q

class I occlusion

A

normal

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37
Q

how many developmental lobes does a premolar have?

A

4: 3 facial 1 lingual

EXCEPT y type mandibular 2nd premolar which has 5: 3 facial 2 lingual

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38
Q

distobuccal groove mandibular second molar

A

not present

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39
Q

compare buccal cusps of mandibular first and second premolars

A

mandibular second premolar has a shorter buccal cusp and the cusp tip is slightly buccal to center of root

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40
Q

Which cusp has more inclined slopes, MB or DB of maxillary (first) molar

A

MB slopes less inclined than DB

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41
Q

compare mesial and distal contacts of maxillary first and second molars

A

on second molar, contacts more centered faciolingually

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42
Q

distal contact of mandibular first molar wrt center

A

slightly facial to center

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43
Q

list buccal cusps of mandibular first molar from largest to smallest

A

MB>DB>D

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44
Q

describe location of cusp tip on maxillary canine

A

From facial aspect: in line with center of root, mesial to center of crown
from mesial aspect: slightly facial to center

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45
Q

Incisal ridge vs incisal edge

A

ridge when newly erupted since slightly rounded. After wear becomes flattened and called incisal edge

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46
Q

when does mandibular second premolar erupt?

A

age 10

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47
Q

describe cingulum of mandibular canine

A

slightly offset towards distal

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48
Q

is maxillary first molar wider buccolingually or mesiodistally?

A

wider bucolingually

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49
Q

How are the mesial and distal marginal ridges oriented wrt long axis in maxillary first premolar?

A

both perpendicular

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50
Q

compare cusp sizes of lingual mandibular first molar

A

ML is slightly taller but mostly same size

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51
Q

On maxillary canine, relation between proximal contacts, cusp slopes, cusp tips?

A

all in straight line

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52
Q

describe root of mandibular first premolar

A

single ovoid root

sometimes two roots

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53
Q

shape of pulp cross section in maxillary central incisor

A

rounded triangular

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54
Q

From a distal and incisal view, compare facial contour of maxillary lateral incisor and maxillary central incisor

A

on maxillary lateral incisor facial contour more rounded

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55
Q

Number of primary teeth

A
  1. 10 upper 10 lower
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56
Q

Where is concavity on distal aspect of maxillary first molar?

A

in cervical third of crown and root

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57
Q

Relation between proximal contacts and incisal ridge of maxillary central incisor,

A

in line

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58
Q

Palmer notation (permanent)

A

symbol indicates quadrant (ie ﹂ indicates upper left), number counts backwards from central incisor (central incisor=1, lateral incisor=2, canine=3, etc)

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59
Q

mandibular second molar which root is longer

A

mesial slightly longer than distal root

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60
Q

What’s special about the distal contact area of maxillary canines?

A

usually concave between contact area and cervical line

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61
Q

tooth with largest occlusal surfaces

A

permanent mandibular molars

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62
Q

Clinical importance of over/under contouring crowns

A

Under contouring: leads to food getting stuck, infection, inflammation
Over contouring: causes tissue to be pushed, cause recession and gingival irritation problems

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63
Q

how to roots on mandibular first molar curve?

A

mesial curves distally halfway down

distal projects distally can can curve any direction to any degree

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64
Q

ridges on occlusal surface of primary mandibular first molar

A

transverse ridge from MB to ML cusps

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65
Q

For upper posterior teeth, how many lingual surfaces (and what shape) and how many buccal surfaces (and what shape)

A

2 planar lingual

1 relatively straight buccal

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66
Q

contact point on mesial aspect of maxillary first molar wrt center

A

slightly buccal and occlusal to crown midpoint (in middle 1/3)

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67
Q

developmental depressions on mandibular first molar

A

deep and cause issues clinically

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68
Q

Number of permanent teeth

A
  1. 16 upper 16 lower
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69
Q

class III occlusion

A

mandible pushed forwards

anterior crossbite

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70
Q

for the mandibular first premolar, which marginal ridge is more occlusally positioned?

A

distal marginal ridge

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71
Q

on maxillary first premolar where are the proximal contacts from an occlusial aspect?

A

both M and D are facial to center

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72
Q

list lingual cusps of mandibular first molar from largest to smallest

A

ML>DL

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73
Q

from a mesial aspect, what’s the crown outline of mandibular second premolar

A

rhombus

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74
Q

From a distal view of maxillary central incisor, which lingual convexities are visible?

A

None, instead some facial aspect can be seen

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75
Q

when does mandibular first premolar erupt?

A

age 9

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76
Q

compare root apex of mandibular first and second molar

A

apex sharper on mandibular second molar and root is narrower

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77
Q

Which dimension of maxillary central incisor crown is longer on facial side?

A

crown slightly longer incisocervically than mesiodistally, also distal aspect is shorter than mesial incisocervically

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78
Q

on maxillary first premolar is mesial or distal occlusocervical height taller?

A

mesial is taller than distal

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79
Q

Where is central portion of cingulum of maxillary central incisor located in relation to center of crown? (mesially?/distally?)

A

distally

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80
Q

Compare incisal edge of maxillary lateral incisor and maxillary central incisor

A

maxillary lateral incisor is broader faciolingually

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81
Q

From a mesial view, where is incisal edge in relation to bisecting line on maxillary lateral incisor?

A

incisal edge ON bisecting line

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82
Q

Types of periodontal ligament fibers and location (6)

A
  • Apical fibers: at apex of root
  • Oblique fibers: from cementum in an oblique direction to insert into bone
  • Horizontal fibers: attach to the cementum apical to the alveolar crest fibers and run perpendicularly from the root of the tooth to the alveolar bone.
  • Dentoalveolar crest fibers: run from the cervical part of the root to the alveolar bone crest
  • Transseptal fibers: extend interproximally over the alveolar bone crest and are embedded in the cementum of adjacent teeth; they form an interdental ligament
  • Interradical fibers: between the roots of multirooted teeth, extend from radicular cementum to interradicular alveolar bone.
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83
Q

how many pulp canals mandibular first molar

A

mesial root has 2 pulp canals, distal has one or two

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84
Q

on mandibular second molar is the root trunk longer on lingual or buccal side?

A

longer on lingual

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85
Q

list maxillary molars from largest to smallest

A

largest maxillary molar is M1, M3 is smallest

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86
Q

describe relation of mesial contact, facial cusp tip and distal contact on mandibular first premolar

A

all in straight line

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87
Q

describe location of lingual height of contour on mandibular first premolar

A

lingual height of contour almost centered on crown

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88
Q

which permanent tooth is primary mandibular second molar comparable to?

A

permanent mandibular 1st molar

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89
Q

biologic width

A

distance from bottom of sulcus to top of bone

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90
Q

Number of lobes on maxillary incisor

A

4 (3 facial 1 lingual)

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91
Q

pulp cross section of maxillary third molar

A

irregular and multiple depressions present

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92
Q

how many fossae/pits mandibular second molar

A

3

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93
Q

FDI numbering system (primary)

International Dental Federation

A

Two numbers: first number indicates quadrant (UR=5, UL=6, LL=7, LR=8), second number counts backwards from central incisor (central incisor=1, lateral incisor=2, canine=3, etc)

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94
Q

when do roots of primary teeth complete formation?

A

1-2 years after eruption

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95
Q

compare occlusal table size of mandibular third molar with first and second

A

mandibular third molar is smallest occlusal table/cusp tips closer together

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96
Q

when does maxillary second premolar erupt?

A

age 10

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97
Q

root:crown ratio of maxillary central incisor

A

root is 1.5x crown

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98
Q

mesial marginal groove mandibular second molar

A

short and shallow when present

99
Q

all primary teeth are erupted by when?

A

2-3 years

100
Q

What age does maxillary canine erupt?

A

11-12

101
Q

where is furcation of buccal roots on maxillary second molar wrt facial developmental groove?

A

distal

102
Q

for premolars, do maxillary or mandibular teeth erupt first?

A

mandibular erupt before maxillary

103
Q

where does the carabelli cusp arise from?

A

from the lingual surface of the ML cusp

104
Q

what type of tooth is not seen in primary dentition?

A

no premolars

105
Q

how many roots primary mandibular first molar? list from largest to smallest

A

2, M>D

106
Q

how many roots on primary maxillary first molar?

A

3

107
Q

Which premolar(s) usually has/have two roots?

A

maxillary first premolar

108
Q

from occlusal view, list cusps of mandibular first molar from largest to smallest

A

MB>ML>DL>DB>D

109
Q

compare root trunk lingually and buccally on mandibular first molar

A

taller on lingual aspect

110
Q

roots curving Maxillary incisors

A

usually incline/curve distally

111
Q

sulcus

A

space between tooth and gingiva (where probing takes place)

112
Q

What’s more curved from the facial view, lateral or central incisors?

A

Lateral is more curved

113
Q

Curve of spee

A

anteriorposterior curved line that connects cusp tips of posterior teeth (lateral view)
Ie. Front to back of mouth

114
Q

on mandibular second premolar, is mesial or distal crown outline longer?

A

mesial crown outline is longer

115
Q

class II occlusion

A

mandible pushed backwards
division I with maxillary teeth straight and mandibular teeth angled to meet them
division II with both maxillary and mandibular teeth angled to meet one another

116
Q

Compare the two roots of maxillary first premolar

A

buccal longer and larger with slightly sharper apex

117
Q

from mesial or distal is more occlusal surface visible on maxillary first molar?

A

from distal

118
Q

describe root of mandibular canine

A

can be bifurcated

119
Q

when does mandibular canine erupt?

A

age 9-10

120
Q

How many cusps on maxillary premolars? mandibular premolars? Relative sizes?

A

maxillary have 2 cusps of equal size

mandibular have >2 cusps with smaller lingual

121
Q

when does maxillary second molar erupt?

A

age 12

122
Q

CEJ line generality

Maxillary incisors

A

mesial usually more incisally positioned than distal CEJ line (less pronounced posteriorly)

123
Q

how many developmental/major grooves on maxillary first molar

A

6

124
Q

What is last tooth to be lost generally?

A

mandibular canine

125
Q

what is first permanent tooth to erupt and when does it start calcification/formation?

A

mandibular first molars are first permanent teeth to erupt at age 6 and start formation at birth

126
Q

Is the first or second premolar larger?

A

Maxillary: 1st >2nd
Mandibular: 2nd> 1st

127
Q

FDI numbering system (permanent)

International Dental Federation

A

Two numbers: first number indicates quadrant (UR=1, UL=2, LL=3, LR=4), second number counts backwards from central incisor (central incisor=1, lateral incisor=2, canine=3, etc)

128
Q

succedaneous dentition

A

permanent dentition

129
Q

on mandibular second molar are ML/MB or DL/DB cusps closer together?

A

mesiolingual and mesiobuccal cusps are closer together

130
Q

What is the most morphologically variable tooth?

A

3rd molar and second most is maxillary lateral incisor

131
Q

pulp of mandibular canine

A

irregular ovoid outline with taper to lingual

132
Q

Universal numbering system (primary)

A

start at A for upper right molar, around to upper left then down to lower left and around to lower right

133
Q

three types of c shaped canals

A

only in mandibular second molar
Type I continuous C
Type II semicolon
Type III two discrete canals

now more types

134
Q

When does maxillary first premolar erupt?

A

age 9

135
Q

perikymata

A

minute transverse ridges on the surface of the enamel of a tooth which correspond to the incremental lines of Retzius.

136
Q

between maxillary and mandibular canine, which is narrower?

A

mandibular canine

137
Q

list cusps of mandibular second molar from largest to smallest from an occlusal view

A

MB>ML>DB>DL

138
Q

location of facial ridge on maxillary canine

A

mesial to center of crown

139
Q

how many developmental lobes on canine?

A

4: 3 facial 1 lingual

140
Q

describe buccal cusp and cusp slopes of mandibular first premolar

A

buccal cusp centered over root from mesial aspect
mesial ridge of buccal cusp is shorter than distal
mesial slope of buccal cusp is slightly concave

141
Q

For lower posterior teeth, how many lingual surfaces (and what shape) and how many buccal surfaces (and what shape)

A

2 planar buccal

1 relatively straight lingual

142
Q

distal marginal groove on mandibular first molar

A

often; when there it’s at midpoint of marginal ridge (which is lingual to midpoint of crown)

143
Q

describe cusp ridges on mandibular canine

A

mesial cusp ridge shorter and more horizontal than distal slope (more than maxillary canine

144
Q

proximal outline form of permanent mandibular molar

A

rhomboidal with lingual inclination

145
Q

is primary maxillary first or second molar larger?

A

primary 2nd

146
Q

describe buccal grooves of mandibular first molar

A

mesiobuccal groove slightly mesial to crown center and root bifurcation and goes down halfway, terminates with pit
distobuccal groove parallel to distal root and longer than mesiobuccal groove

147
Q

lists cusps of primary maxillary first molar from largest to smallest

A

MB>ML>DB>DL

DB and DL insignificant in size, sometimes DL not present at all

148
Q

differences in pulp canals in first and second maxillary molars

A

second usually has one pulp canal per root

149
Q

how many roots primary mandibular second molar

A

2

150
Q

describe tilt of crown of mandibular canine

A

entire crown tilted distally wrt long axis of tooth

151
Q

erupting age of maxillary lateral incisor

A

age 8

152
Q

shape of pulp in maxillary canine

A

wider faciolingually than mesiodistally, possible bifurcation

153
Q

Mucogingival junction separates what?

A

Separates attached gingiva (near crowns) from alveolar mucosa (loose tissue away from crowns)

154
Q

two parts of occlusal table of maxillary first molar

A

TRIGON: mesial part (outlined by MB, ML, and DB cusps
TALON: heel defined by DL cusp

155
Q

list 3 types of mandibular second premolar from most to least common

A

Most common: Y type, then H type and U type is least common

156
Q

list primary mandibular first molar cusps largest to smallest

A

MB>ML>DB>DL

157
Q

describe root of maxillary second premolar

A

usually single root
sometimes two pulp canals
no root concavities
ovoid

158
Q

How does the incisal edge of maxillary lateral incisor differ from maxillary central incisor?

A

maxillary lateral incisor has more rounded incisal angles with distal more rounded than mesial. Also incisal edge can slope gingivally towards distal

159
Q

Deciduous dentition

A

primary dentition

160
Q

Occlusal plane

A

curved surface that can rest on all teeth. Never flat.

161
Q

compare roots of primary incisors with permanent ones

A

primary anterior teeth have roots more narrow and pointed

162
Q

Mamelons are found on which teeth?

A

Permanent Incisors

163
Q

which permanent tooth is primary maxillary second molar comparable to?

A

permanent maxillary 1st molar

164
Q

compare groove and fossae patters of first and second maxillary molars

A

they have same groove and fossae patterns

165
Q

Proximal contacts maxillary teeth

A

Central: mesial incisal 1/3, distal junc of incisal/middle 1/3
Lateral: mesial junc of incisal/middle 1/3, distal middle 1/3
Canine: mesial junc of incisal/middle 1/3, distal middle 1/3
Rest middle 1/3

166
Q

transverse vs oblique ridge

A

transverse goes directly across tooth, oblique goes diagonally across tooth

167
Q

where is lingual developmental groove wrt bifurcation on mandibular second molar

A

in line

168
Q

when do roots of primary teeth begin to resorb?

A

2-3 years before exfoliation

169
Q

From an incisal view of maxillary central incisor, how is the cingulum positioned in relation to the center bisecting line?

A

cingulum is slightly distal

170
Q

number of cusps mandibular third molar

A

4

171
Q

What are the occusal outline forms of the 4 premolars?

A

Maxillary 1: hexagon
Maxillary 2: Oval
Mandibular 1: diamond
Mandibular 2: square

172
Q

from facial view, what’s crown outline of maxillary primary canine?

A

diamond

173
Q

cervical cross section mandibular third molar

A

variable
two canals in mesial root, one in distal
tapered to distal

174
Q

second longest teeth in mouth?

A

mandibular canine

175
Q

crown to root ratio mandibular third molar

A

1:1

176
Q

number cusps mandibular second molar

A

4

177
Q

compare placement of cingulum of maxillary lateral incisor and maxillary central incisor

A

on maxillary lateral incisor cingulum is more centrally placed

178
Q

what primary tooth has largest faciolingual diameter?

A

maxillary second molar

179
Q

root shape of mandibular second premolar

A

most common single root with one pulp canal, ovoid pulp canal (sometimes bi or trifurcated in apical third)

180
Q

lingual groove on mandibular first molar

A

no pit, in line with bifurcation

181
Q

What shape is the crown of maxillary first premolar from buccal aspect?

A

bell shaped

182
Q

how many major grooves mandibular first molar

A

4

183
Q

compare lingual cusps of mandibular first and second premolars

A

lingual cusps of mandibular second premolar are higher

184
Q

Where are radicular grooves most often found?

A

On the palatal aspect of maxillary lateral incisor, and rarely on the labial root surface of central incisors

185
Q

From a mesial/distal view, where is incisal edge in relation to bisecting line of maxillary central incisor?

A

incisal tip and root apex ON bisecting line (middle of tooth) with mesial proximal contact

186
Q

pulp chamber shape primary mandibular second molar

A

wider rectangle than mandibular first (wider mesiodistally)

187
Q

pulp chamber cross section shape mandibular first molar

A

cross section 8 shape

188
Q

What is the only tooth in the mouth to diverge (get wider) towards the lingual?

A

maxillary first molar

189
Q

outline form of maxillary (first) molar from mesial aspect

A

trapezoid

190
Q

which way to maxillary/mandibular premolars incline?

A

mandibular towards lingual, maxillary do not at all

191
Q

groove pattern of maxillary third molar

A

numerous secondary grooves, very variable

192
Q

heights of contour on primary anterior teeth

A

on buccal and lingual cervical ridges

193
Q

Universal numbering system (permanent)

A

start at 1 for upper right wisdom tooth, around to upper left then down to lower left and around to lower right

194
Q

describe roots of maxillary third molar

A

usually fused and very distally curved

195
Q

on mandibular first molar are lingual or buccal cusps taller?

A

lingual

196
Q

describe cusp and cusp slopes of mandibular second premolar?

A

short buccal cusp with ridges forming obtuse angle (mesial ridge shorter than distal)

197
Q

From the mesial aspect, what’s the crown outline of the maxillary first premolar?

A

trapezoidal

198
Q

what permanent teeth are not succedeous

A

permanent molars

199
Q

pulp chamber shape primary maxillary first molar

A

roughly triangular

200
Q

pulp chamber shape primary maxillary second molar

A

square

201
Q

which permanent tooth is primary mandibular first molar comparable to?

A

none: it is unique

202
Q

leeway space

A

space gained by the difference in mesiodistal dimensions of the premolars and the primary molars

203
Q

crown outline form of maxillary (first) molar

A

trapezoidal

204
Q

where is root furcation in maxillary third molar

A

apical third of root

205
Q

crown contours maxillary incisors

A

more rounded distally than mesially

206
Q

What shape is the crown on the mandibular second premolar?

A

not bell shaped (instead it has a broader crown)

207
Q

describe CEJ of maxillary third molar

A

irregular in form

208
Q

on primary mandibular canine, is mesial or distal cusp ridge longer?

A

shorter mesial, longer distal

209
Q

occlusal outline form for maxillary molars

A

rhomboid occlusal outline except M3 might be heart shaped

210
Q

eruption age of maxillary central incisor

A

erupts at age 7

211
Q

which root has shaper apex on mandibular first /second molar, mesial or distal?

A

distal is sharper root apex

212
Q

which mandibular premolar has a transverse ridge?

A

mandibular first premolar

213
Q

roots mandibular third molar

A

short, fused, compressed, dramatic tapering to apex, distally inclined

214
Q

Curve of Wilson

A

mediolateral curved line that connects buccal and lingual cusp tips on each side of the arch (frontal view)

215
Q

eruption sequence of permanent teeth

A

first molar (6-7, 6-7), central incisors (6-7, 7-8), lateral incisors (7-8, 8-9), mandibular canines (9-10) and maxillary first premolars (10-11), mandibular first premolars (10-12) and maxillary second premolars (10-12), maxillary canines (11-12) and mandibular second premolars (11-12), second molars (11-13, 12-13).

216
Q

how many fossae mandibular first molar

A

3

217
Q

when does maxillary third molar erupt

A

age 18+

218
Q

occlusal aspect shape of permanent mandibular molar

A

M1 pentagonal, M2 and M3 rectangular with M3 more rounded

219
Q

what can be found on mesial marginal ridge of maxillary first molar?

A

tubercules or mesial marginal groove

220
Q

Which mesial/distal side of maxillary central incisor is straighter/more curved?

A

distal more rounded, mesial relatively straight

221
Q

Which marginal ridge on a posterior tooth is not perpendicular to the long axis of the tooth?

A

mesial marginal ridge of mandibular first premolar is tipped lingually

222
Q

On maxillary canine, is mesial or distal cusp ridge (from a facial perspective) shorter?

A

mesial cusp ridge is shorter than distal

223
Q

when does mandibular 2nd molar erupt?

A

age 12

224
Q

Proximal contacts mandibular teeth

A

cental: mesial and distal incisal 1/3
lateral: mesial and distal incisal 1/3
canine: mesial incisal 1/3, distal middle 1/3
rest middle 1/3

225
Q

what is unique about cusps of maxillary third molar

A

DL cusp often absent, single lingual cusp left is largest cusp

226
Q

mesial marginal groove on mandibular first molar

A

sometimes

227
Q

on primary maxillary canine, is mesial or distal cusp ridge longer?

A

mesial longer (opposite of permanent)

228
Q

On canines, are mesial or distal crown contours more rounded?

A

distal crown contours more rounded

229
Q

Which maxillary premolar has mesial marginal groove and where is it located?

A

maxillary first has groove which is slightly lingual from center

230
Q

shape of pulp of maxillary lateral incisor

A

ovoid

231
Q

from facial view, what’s crown outline of mandibular primary canine?

A

arrow shaped

232
Q

Are developmental grooves/pits seen in maxillary central incisor?

A

Yes, but more common in maxillary lateral incisors

233
Q

Palmer notation (primary)

A

symbol indicates quadrant (ie ﹂ indicates upper left), letters count backwards from central incisor (central incisor=A, lateral incisor=B, canine=C, etc)

234
Q

how many triangular ridges on mesiolingual cusp of maxillary first molar?

A

2

235
Q

Height of contours maxillary

A

Central, lateral and canine: facial and lingual cervical 1/3

pre and molars: facial at cervical 1/3, lingual at middle 1/3

236
Q

differences between primary and permanent molars (11)

A

primary has:

  • lighter colour
  • thinner enamel
  • thicker dentin in central fossa, thinner elsewhere
  • higher pulp horns/larger pulp chamber
  • more pronounced cervical ridges
  • enamel rods @ CEJ slope occlusally
  • more constricted cervix
  • short root trunks
  • smaller occlusal table
  • roots slender and long
  • roots flared beyond crown outline
237
Q

how many major grooves mandibular second molar

A

3

238
Q

when do primary teeth begin calcification?

A

4-5 months in utero

239
Q

Which fossae of maxillary canine is larger?

A

ML fossa smaller than DL fossa

240
Q

eruption sequence of primary dentition

A

central, lateral incicors, first molars (one year molars) canines, second molars (two year molars)

241
Q

are permanent mandibular molars wider mesiodistally or buccolingually

A

wider mesiodistally

242
Q

describe lingual cusp and cusp slope of maxillary first premolar

A

mesial and distal ridges form ~right angle, cusp offset to mesial

243
Q

describe buccal cusp separation in maxillary (first) molar

A

B cusps separated by buccal groove which goes ~1/2 up B surface
ends in depression and sometimes pit

244
Q

tooth with largest mesiodistal dimension

A

mandibular first molar

Dental Anatomy Midterm (1 decks)

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