mandibular molars Flashcards Preview

dental anatomy > mandibular molars > Flashcards

Flashcards in mandibular molars Deck (181):
1

Has the greatest mesiodistal dimension of any tooth in the mouth

mandib 1st molar

2

number of cusps for

mand 1st molar

5

3

Mand 1st molar

Anchor tooth of Mandibular arch

4

3 buccla and 2 lingual cusps

mand 1st molar

5

4 cusps

mand M2

6

tf Mand M2 is smaller than mand M1

T

7

C-shaped canal is a special feature of some

lower second molars.

8

Some or all of the canal orifices are joined in the form of a groove or isthmus with a shape of the letter C.

mand M2

9

The continuous C-shaped canal

Type I C shaped canal

A image thumb
10

type 2 c shaped canal

The semicolon shaped canal

A image thumb
11

Two discrete and separate canals.

Type III : c shaped canal

A image thumb
12

the shape is an uninterrupted ‘C’ with no separation or division.

c1 melton

A image thumb
13

the canal shape resembles a semicolon resulting from a discontinuation of the ‘C’ outline.

Category C2: Melton

A image thumb
14

two separated canals.

Category C3a:

A image thumb
15

three separated canals. C

Category C3b: Melton

A image thumb
16

Category C4:

only one round or oval canal.

A image thumb
17

PERICORONITIS (Acute or Chronic)

Inflammation of the soft tissues surrounding the crown of a partially erupted tooth 

Mand M3

18

tf Third Molars Have a High Incidence of Pathology

F

Not more than 12% of impacted teeth have associated pathology

19

tf Early Removal of Third Molars Is Less Traumatic

F

Early removal of third molars is actually more traumatic and painful than leaving asymptomatic, nonpathologic teeth in situ

20

tf Third molars do not possess sufficient force to move other teeth or cause crowding, overlapping

T

21

tf There is no evidence of a significant increase in third-molar pathology with age

T

22

tf There is Little Risk of Harm in the Removal of Third Molars

F

Days of “standard discomfort or disability”—pain, swelling, bruising, and malaise result postoperatively, and more than 11,000 people suffer permanent paresthesia

23

mand 1st molar

has --- buccal cusp separateed by --- grooves

3;2

24

names of grooves that separate the 3 buccal cusps of mand

1st molar

mesiobuccal developmental groove and distobuccal developmental groove

25

order of size of 3 buccal cusps of mand M1

MB

D

DB

MB>DB>D

26

tf from buccal aspect of mand M1

lingual cusp is shorter than buccal cusp

F

is longer

27

which are more blunt on mand M1

buccal or lingual cusp

buccal cusp

28

most blunt buccal cusp of mand M1

MB 

DB 

 

D

MB

29

tf 4 cusps are visible from buccal side of mand M1

 

all 5 cusp visible

30

Mesiobuccal groove slightly ----- to crown center mesiodistally of Mand M1 buccally

mesial

31

Mesiobuccal groove of Mand M1

 

extends halfway down the buccal surface terminating with pit

32

mesial to root bifurcation

MB groove

33

Distobuccal groove near DB line angle runs -----

to distal root

Mand M1

Distobuccal groove near DB line angle runs parallel to distal root

MAnd M1

34

sl. longer than MB groove

(mand M1 buccal view)

DB groove

35

tf from buccal view of Mand M1

all of Mesial profile convex 

F

cervical 1/3 which appears somewhat concave

36

tf distal profile (buccal view of Mand M1)

straight al the way through

F

Distal profile straight until convex at D contact area

37

Buccal cervical ridge runs ------ in cervical third of crown.

(buccal view of Mand M1)

Buccal cervical ridge runs mesiodistally in cervical third of crown

38

Slight depressed area just occlusal to CEJ of Mand M1

Slight ----- area just occlusal to CEJ(buccal view)

39

Buccal CEJ slightly ------ apically

(mand M1 buccal view)

Buccal CEJ slightly curved apically

(mand M1 buccal view)

40

Buccal CEJ of Mand M1

may dip toward bifurcation midbuccally

41

tf from buccal view of Mand M!

3 roots are visible

F

2 roots visible

42

mesial root curves ----- half way down;

Mand M1

mesial root curves distally half way down;

43

mesial root of Mand M1

 has 

Often deep developmental depressions on both M&D aspects (buccal view)

44

distal root of MAnd M1 projects distally

(Mand M1)

and can turn mesially, distally, or not at all

45

root trunk 

3mm wide

(vertically)

46

lingual aspect of Mand M1

tf MAnd m1 appears taller from lingual

T

47

Lingual aspect of Mand M1

taller root trunk

48

4mm 

root trunk of MAnd M1 lingual

49

tf 

 

Crown surface of Mand M1 longer mesiodistally than buccal aspect

f

Crown surface smaller mesiodistally than buccal aspect

50

lingual groove of Mand M!

separates Two cusps of approximately equal size

51

tf lingual groove of Mand M1 is shorter than buccal groove

and has no lingual pit

T

52

bifurcatin of Mand M1 in line with

lingual groove

53

taller and sharper

buccal or lingual cusp of Mand M1

lingual cusp

54

ML 

tallest cusp of lingual cusp s of Mand M1

55

tf mesial and distal profiles of Mand M1 are convex throughout entire lingual aspect

T

56

flat CEJ of Mand M1

in lingual view

57

tf from lingual aspect of Mand M1 no buccal cusp is visible

F

part of buccal cusp is visible

58

on Mand M1 

from which side are roots narrower

lingual or buccal

lingual

59

crown of Mand M1 from mesial

rhomboid

60

mesial aspect of Mand M1

 

crown tilts to lingual in relation to long axis

61

which cusp taller from mesial view of Mand M!

ML or MB

ML

62

ML and MB cusps

well within borders of mesial root

of Mand M1(mesial)

63

mesial marginal ridge has

mesial marginal groove

on Mand M1 (mesial view)

64

distance of mesial marginal ridge of mand M1 in comparison to  height of cusps(mesial view)

1 mm

65

mand M! 

Mesial root very broad ----- with shallow------ or ----

Mesial root very broad buccolingually with shallow concavity or depression

66

Buccal profile of Mand M1

convex

67

Lingual profile of Mand M1

convex

68

CEJ of Mand m1 ------- or slightly ------ toward occlusal

CEJ straight or slightly curved toward occlusal

69

Usually ----- or slightly ------ area of mand M1 in cervical third of crown

Usually flattened or slightly concave area in cervical third of crown

70

mesial aspect of Mand M1

Contact area centered

71

contact area of Mand M1

slightly buccal and occlusal to midpoint of crown

72

distal aspect of Mand M1

Smaller buccolingually than mesial surface

73

mand m1

tapers dramatically towards distal

(distal view)

74

tf mesial and distal view of Mand M!

Buccal and lingual profiles are similar

75

distal view of Mand M!

Portions of all five cusps visible

76

from distal view of mand m1

which cusp is most lingually positioned

D

DB

DL

D cusp

77

DB line angle of mand M1

DB groove visible near

78

total surfaces vissible from distal view of mand m1

4

facial , distal , occlusal ,distal surface of mesial root

79

tf mand m1 distal view; distal marginal ridge is centered

F

80

tf

mand m1 distal view

Distal marginal ridge much longer than mesial marginal ridge

F

Distal marginal ridge much shorter than mesial marginal ridge

81

midpoint of Mand M1(distal view)

distal marginal groove

82

distal contact of Mand M1

facial to center

83

Mand M1 distal view

Distal root narrower buccolingually with shallow distal depression

84

Distal root of mand m1 has continuous ----  with sharper ---- than mesial root

Distal root has continuous taper with sharper apex than mesial root

85

from occlusal view of mand M1

pentagon outline shape

86

tf mand m1

Wider mesiodistally than buccolingually

T

87

which side of Mand M1 is wider mesiodistally 

buccal 

88

which side of Mand M1 is widest buccolingually

mesial

89

cusp slopes and 2 marginal ridges of mand M1

border Occlusal table

90

which side of Mand M1 is more visible from occlusal

buccal or lingual

buccal

91

arrange the following cusps in terms of size of Mand M1 from occlusal

MB

DL

DB

D

ML

MB>ML>DL>DB>D)

92

Inner ----- ridges of cusps shown from occlusal of Mand M1

Inner triangular ridges of cusps shown from occlusal of Mand M1

93

name the three fosa visible from occlusal of MAnd M1

centrall 

distal

mesial

94

which fossa of mand M1 contain central pit 

central fossa

95

shallow pits of mand m1 onf occlusal view

mesial and distal triangular fossae

96

from occlusal view of Mand M1 name the types of grooves

MB DB

central

lingual

97

tf Occlusal view; mesial marginal grove wider than distal marginal groove of mand M1

t

98

from the occlusal view of mand M1 which side does the crown converge

lingually

99

from occlusal view of mand m1

which side of mand m1 shows straighter outline with little

taper; mesial or distal

mesial

100

T

cervical cross section of mand m1

Wider mesiodistally than buccolingually

T

101

cross section of mand M1

root trunk 

contain facial and lingual depressions

102

roots of mand m1

mesial 

has two pulp canals (B and L)

103

D root of mand m1

one pulp canal but often two (B and L)

104

tf only mesial root of mand m1

wider buccolingually than mesiodistally

both mesial and distal

105

longitudinal grooves

developmental depression of mand m1 on mesial and distal surface of mesial and distal roots

106

tf

Mand M1 Mesial root broader and slightly longer than distal root

t

107

mesial root of mand m1

projects mesially from CEJ to middle third of root,

then curves slightly to the distal;

108

mand m1 distal root

distal root smaller; projects distally

109

mand m2 buccal aspct

Smaller than M1, larger than M3

110

tf from buccal aspect of mand m2 crown and is shorter than m1

T

111

buccla grove of mand m2 (buccal aspect0

separates MB and DB cusps

112

tf MB cusp > DB cusp of mand m2

T

113

tf buccal aspect of mand m2 has a buccal pit

F

nill

114

tf from buccal view of mand m2 

all 3 cusp visible

F

all 4

115

buccal view of mand m2

----- groove and ---- in line with each other

Buccal groove and bifurcation in line with each other

116

tf huge curvature in mand m2 CEJ from buccal view

F

no curvature , straight

117

from buccal view of mand m2

which side is roudned 

mesial or distal 

distal

118

which contact of mand m2 (buccal veiw)

closer to junction of middle and occlusal thirds

mesial or distal

Mesial contact closer to junction of middle and occlusal thirds

119

tf 

mand m2 Roots closer together and show greater distal inclination

T

120

which root is longer from buccal view of mand M2

mesial or distal view

mesial root

121

lingual aspect of mand m2

Crown shorter than M1 and narrower mesiodistally

122

equal in length mesiodistally (mand m2)

Lingual width mesiodistally almost equal to buccal width 

123

taper to lingual

lingual aspect of mand m2

124

name the 2 prominent cusp visible of mand m2 from lingual aspect

ML and DL

125

tf from lingual aspect of mand m2

DL cusp > ML cusp

F

ML>DL

126

tf lingual cusp of mand m2 are sharper than buccal cusp

T

127

Lingual ----- groove in line with -----

of mand m2(lingual view)

Lingual developmental groove in line with bifurcation

of mand m2(lingual view)

128

tf root trunk is longer on buccal aspect than lingual aspect of mand m2

 

F

lingual aspect

129

mesial aspect of mand m2

Crown outline similar to M1 (rhomboidal or parallelogram

130

tf mand m2 has narrower occlusal table than m1 (mesial veiw)

T

131

short and shallow

mesial marginal ridge of mand m2

(mesial veiw)

132

mand m2

ML cusp---- than MB cusp

mand m2

ML cusp taller than MB cusp

133

from mesial view

which cusp more centered over root

MB or Ml cusp

MB cusp

134

Buccal cervical ridge of mand m2 ---- pronounced than M1

Buccal cervical ridge of mand m2 less pronounced than M1

135

Mesial contact of mand m2 closer to ---- of middle and occlusal thirds(mesial view)

Mesial contact of mand m2 closer to junction of middle and occlusal thirds

136

which height of contour of MAnd M2  is more occlusally positioned

lingual or buccal ?

Lingual height of contour more occlusally positioned

137

mesial view of mand M2

Root narrower than M1 with sharper apex

138

distal view of mand m2

Distal marginal ridge more gingivally positioned than mesial

139

tf from distal view less occlusal table is visible than mesial view

F

more is visible

140

tf only 2 cusps of mand m2 are visible from distal view of mand m2

F

all 4

141

from distal view of mand m2

no distal cusp or DB groove

142

tf distal and mesial surface of mand m2 are same size

F

Distal surface is almost as large as mesial (but not quite)

143

distal contact area of mand m2

 more centered

144

narrower and poiitned tip

mand m2 (distal view)

145

root mand m2 (distal view)

uniformly convex

146

tf occusal view of mand m2 has a hexgonal shape

F

rectangular

147

from occlusal view of mand m2 which side is more rounded

distal or mesial

distal

148

arrange the cusps of mand m2 from large to small

MB

DB

DL

ML

MB>ML>DB>DL

149

which cusps of mand m2 are closer together

distal or mesial

(occlusal view)

mesial cusp

150

number of grooves of mand m2 and type

 

3

central

buccal 

lingual

151

types of fossa of mand m2 

Central fossa, mesial and distal triangular fossae

152

which fossa of mand m2 has deepest pits

Central fossa, mesial or distal triangular fossa

central

153

occlusal view of mand m2

Proximal contacts in middle 1/3

154

Mesial third of crown slightly ---- buccolingually than distal third

of mand m2 occlusal

Mesial third of crown slightly wider buccolingually than distal third

155

occlusal of mand m2

buccal third ----- mesiodistally than lingual third

buccal third wider mesiodistally than lingual third

156

roots of mand m2

Similar to M1 but usually shorter and closer together

157

tf roots of mand m2

are only separate

f

Occasionally may be partially or totally fused (with C-shaped canal) or further apart like M1

158

Wider mesiodistally than buccolingually

cevical cross section of mand m2

159

which side of mand m2 is wider buccolingually

mesial and distal

(mesial half wider buccolingually

160

2;1

# canals in mesia vs distal root of mand m2

161

bifurcation of mand m2

has Facial and lingual depressions ass. with it

162

c shaped canal of mand m2

The name comes from the appearance of the pulp chamber floor when viewed from above.

163

tf Mandibular Third Molar variable only in size

F in size and shape

164

congenitally missing

mand molar 3

165

can resemble m1 or m2

mand m3

166

tf crown and root of mand m3 is larger than m1 and m2

F

smaller

167

occlusal of mand m3 tapering occurs

to distal

168

MAnd m3 ;

Occlusal groove pattern variable with more ------

grooves

Occlusal groove pattern variable with more supplementary grooves

169

tf mand m3 is square shape

f

round shape

170

occlusal  of mand m3

has 4  cusps

171

mand m3 ; which half is wider  buccolingually

mesial or distal?

mesial half wider buccolingually

172

tf mand m3

crown; root= 1;1.5

t

1;1

173

Bulbous outline from proximal, with small occlusal table

mand m3

174

mand m3

cusp tips may be ----- together than M1 and M2

mand m3

cusp tips may be closer together than M1 and M2

175

tf mand m3 

Roots taper dramatically toward apex

T

176

short, fused, or compressed

roots of mand m3

177

distal inclination 

mand m3 roots

178

smallest and shortest of all mandibular molar roots

distal root of mand molar 3 

179

cervical cross section of mand m3

2 canals in mesial root 

1 canal in distal root

180

Root outline tapered toward the distal

mand m3 cervical cross section

181