Tooth Morphology

Question 1

Where is the lingual crest of curvature for all teeth?

Answer 1

in the cervical third

Question 2

Which of the following junctions can be seen on an intact tooth held in your hand?

a. cementodentinal
b. dentinoenamel
c. cementoenamel
d. enamelopulpal
e. cementopulpal

Answer 2

c.

Question 3

Which of the following statements is/are true regarding ALL incisors?

a. When viewed from F, crowns are shorter I-G than wide M-D.
b. When viewed from F, crowns are more convex in the M than on the D sides.
c. When viewed from proximal, incisors have a cervical line that is concave, curving apically.
d. When viewed from incisal, crowns have a facial outline (curve) that is broader and less curved than the lingual outline.
e. When viewed from facial, crowns are wider at the cervical line than at the proximal contact area.

Answer 3

d. When viewed from incisal, crowns have a facial outline (curve) that is broader and less curved than the lingual outline.

Question 4

What ridges make up the transverse ridge of most premolars?

a. buccal and lingual oblique ridges
b. buccal and lingual triangular ridges
c. mesial and distal marginal ridges
d. buccal and lingual cusp slopes or cusp arms
e. buccal and lingual cervical ridges

Answer 4

b. buccal and lingual triangular ridges

Question 5

Posterior teeth in the permanent dentition include which teeth?

Answer 5

Premolars and molars.

Question 6

Which tooth surface(s) face(s) the lips or cheeks?

a. facial
b. distal
c. buccal
d. occlusal
e. labial

Answer 6

a. facial
c. buccal
e. labial

Question 7

Which pairs of teeth have a mesial surface touching a mesial surface?

a. 25 and 26
b. 16 and 17
c. 7 and 8
d. 1 and 32
e. 8 and 9

Answer 7

e. 8 and 9

Question 8

When viewing tooth No. 8 from the distal view, it can be divided into thirds from the incisal to the cervical and from the facial to the lingual. Which third is NOT possible to see from the distal view?

a. facial
b. cervical
c. middle
d. mesial
e. incisal

Answer 8

d. mesial

Question 9

If you were observing the faciolingual dimension of a tooth, what surface(s) could you be viewing?

a. mesial
b. occlusal
c. proximal
d. labial
e. distal

Answer 9

a. mesial
b. occlusal
c. proximal
e. distal

Question 10

If the root-to-crown ratio of a maxillary molar (No. 14) is 1.72 and that of another molar, No. 16, is 1.49, which tooth has the longest root relative to its shorter crown?

a. No 14
b. No 16
c. More information required to answer question.

Answer 10

a. No 14

Question 11

Which of the following bumps or ridges is NOT likely to be found on a maxillary premolar?

a. oblique ridge
b. cingulum
c. mesial marginal ridge
d. transverse ridge
e. triangular ridge

Answer 11

a. oblique ridge

b. cingulum

Question 12

Which ridge(s) surround the perimeter of the occlusal surface (occlusal table) of a two-cusped premolar?

a. mesial marginal ridge
b. distal marginal ridge
c. mesial cusp ridge of the buccal cusp
d. distal cusp ridge of the lingual cusp
e. transverse ridge

Answer 12

a. mesial marginal ridge
b. distal marginal ridge
c. mesial cusp ridge of the buccal cusp
d. distal cusp ridge of the lingual cusp

Question 13

When viewed from the proximal, what is the location of the greatest bulge (crest of curvature or height of contour) on the facial surface of all teeth?

Answer 13

cervical third

Question 14

Which space(s) contain(s) the part of the gingiva known as the interdental papilla?

a. buccal embrasure
b. occlusal embrasure
c. lingual embrasure
d. cervical embrasure
e. interproximal space

Answer 14

d. cervical embrasure

e. interproximal space

Question 15

How many developmental lobes form a premolar with two cusps (one buccal cusp and one lingual cusp)?

Answer 15

4 lobes

Question 16

Which of the following grooves radiate out from the central fossa in a mandibular second molar?

a. central
b. mesiobuccal
c. distobuccal
d. lingual
e. buccal

Answer 16

a. central
d. lingual
e. buccal

Question 17

Which cusp is the largest and longest on a mandibular second molar?

a. Mesiobuccal
b. Distobuccal
c. Mesiolingual
d. Distolingual
e. Distal

Answer 17

c. mesiolingual

Question 18

Which cusp may be absent on a mandibular first or third molar?

a. Mesiobuccal
b. Distobuccal
c. Mesiolingual
d. Distolingual
e. Distal

Answer 18

e. distal

Question 19

When a distal cusp is absent form a mandibular first or third molar, which groove(s) would not be present?

a. Buccal
b. Lingual
c. Mesiobuccal
d. Distobuccal
e. Lingual

Answer 19

c. mesiobuccal

d. distobuccal

Question 20

Which fossae are found on a mandibular first molar?

a. mesial triangular
b. distal triangular
c. buccal
d. lingual
e. central

Answer 20

a. mesial triangular
b. distal triangular
e. central

Question 21

Which developmental groove connects with the lingual groove running in the same direction on a mandibular second molar?

a. Meisobuccal
b. Distobuccal
c. Buccal
d. Mesiolingual
e. Distolingual

Answer 21

c. buccal

Question 22

From which view is only one root visible on a mandibular first molar?

a. mesial
b. distal
c. buccal
d. lingual
e. apical

Answer 22

a. mesial

Question 23

Which root may occasionally be divided or bifurcated on a mandibular first molar?

a. Buccal
b. Lingual
c. Mesial
d. Distal
e. Mesiobuccal

Answer 23

c. mesial

Question 24

Which cusp triangular ridge does not meet to form a transverse ridge on a five-cusp first molar?

a. mesiobuccal
b. distobuccal
c. mesiolingual
d. distolingual
e. distal

Answer 24

e. distal

Question 25

Which ridges form the boundaries of the mesial triangular fossa of a mandibular molar? a. Triangular ridge of MB cusp b. Triangular ridge of ML cusp c. Mesial marginal ridge d. Buccal cusp ridge of mesiobuccal cusp e. Lingual cusp ridge of mesiolingual cusp

Answer 25

a. triangular ridge of MB cusp b. triangular ridge of ML cusp c. mesial marginal ridge

Question 26

Which two pairs of triangular ridges make up or joint to form the two transverse ridges on a mandibular second molar?

Answer 26

MB and ML plus DB and DL

Question 27

List in sequential order the longest to shortest cusps on the mandibular first molar.

Answer 27

ML > DL > MB > DB > D

Question 28

Which three grooves radiate out from the central fossa in a maxillary first molar? a. central b. distolingual c. transverse groove of oblique ridge (when present) d. buccal e. lingual

Answer 28

a. central c. transverse groove of oblique ridge (when present) d. buccal

Question 29

Which cusp on a maxillary first molar has two ridges: one that forms part of a transverse ridge and the other that forms part of an oblique ridge?

Answer 29

ML

Question 30

Which cusp is the largest and longest on a maxillary second molar?

Answer 30

ML

Question 31

Which cusp is most likely to be absent on a maxillary second molar?

Answer 31

DL

Question 32

When the DL cusp is absent on a maxillary second molar, which groove(s) would not be present? a. Central b. buccal c. distal oblique d. lingual

Answer 32

c. distal oblique | d. lingual

Question 33

Of the four fossae on a maxillary first molar, which is the largest? a. Mesial triangular b. Distal triangular c. Central d. Distal

Answer 33

c. central

Question 34

From which view are only two roots visible on a maxillary first molar? a. Mesial b. Distal c. Buccal d. Lingual

Answer 34

a. mesial

Question 35

Which grooves are likely to radiate out of the mesial triangular fossa on the maxillary first molar? a. Mesiobuccal fossa groove b. Mesiolingual fossa groove c. Mesial marginal ridge groove (when present) d. central e. buccal

Answer 35

a. mesialbuccal fossa groove b. mesiallingual fossa groove c. mesial marginal ridge groove (when present) d. central

Question 36

Which two cusps have the ridges that make up or joint to form the oblique ridge on a maxillary molar? a. MB b. DB c. ML d. DL e. Cusp of Carabelli

Answer 36

b. DB | c. ML

Question 37

Which two cusps have a triangular ridge that make up or join to form a transverse (not oblique) ridge on most maxillary molars? a. MB b. DB c. ML d. DL e. Cusp of Carabelli

Answer 37

a. MB | c. ML

Question 38

List in sequential order the largest to smallest cusp area on the maxillary first molar (occlusal view).

Answer 38

ML > MB > DB > DL > cusp of Carabelli (if present)

Question 39

Which tooth junctions are NOT normally visible on a handheld intact tooth? a. Cementoenamel junction b. Dentinoenamel junction c. Dentinocemental junction d. Dentiopupal junction

Answer 39

b, c, d

Question 40

Consider: maxillary central incisor, maxillary canine, and mandibular canine. This tooth exhibits less cervical line curvature on the distal aspect than on the mesial aspect.

Answer 40

all: maxillary central incisor, maxillary canine, mandibular canine

Question 41

Consider: maxillary central incisor, maxillary canine, and mandibular canine. The cingulum is centered mesiodistally.

Answer 41

maxillary canine

Question 42

Consider: maxillary central incisor, maxillary canine, and mandibular canine. There is an almost continuous crown-root outline on the mesial surface of this tooth.

Answer 42

mandibular canine

Question 43

Consider: maxillary central incisor, maxillary canine, and mandibular canine. The mesial contact area is located more incisally than the distal contact area on the same tooth.

Answer 43

all: maxillary central incisor, maxillary canine, mandibular canine

Question 44

Consider: maxillary central incisor, maxillary canine, and mandibular canine. The cusp tip is positioned lingual to the mid-root axis line from the proximal view.

Answer 44

mandibular canine

Question 45

Consider: maxillary central incisor, maxillary canine, and mandibular canine. Mamelons could be observed on this tooth.

Answer 45

maxillary central incisor

Question 46

Consider: maxillary central incisor, maxillary canine, and mandibular canine. On which tooth is the cusp angle most acute?

Answer 46

maxillary canine

Question 47

Consider: maxillary central incisor, maxillary canine, and mandibular canine. The mesiodistal width of this tooth is greater than it labiolingual width.

Answer 47

maxillary central incisor

Question 48

Consider: maxillary central incisor, maxillary canine, and mandibular canine. The mesial and distal marginal ridges are aligned more vertically than horizontally on the lingual surface.

Answer 48

all: maxillary central incisor, maxillary canine, mandibular canine

Question 49

``` Consider: maxillary central incisor, maxillary canine, and mandibular canine. The teeth (tooth) develop(s) from 4 lobes. ```

Answer 49

all: maxillary central incisor, maxillary canine, mandibular canine

Question 50

``` Consider: maxillary central incisor, maxillary canine, and mandibular canine. The teeth (tooth) develops(s) from 3 lobes. ```

Answer 50

none - not: maxillary central incisor, maxillary canine, mandibular canine

Question 51

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Mesial cusp ridge of the buccal cusp is longer than the distal cusp ridge.

Answer 51

maxillary first premolar

Question 52

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Has a nonfunctioning lingual cusp.

Answer 52

mandibular first premolar

Question 53

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Two premolars that most frequently have a groove crossing the mesial marginal ridge or one groove just lingual to it.

Answer 53

maxillary first premolar, mandibular first premolar

Question 54

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Has a depression in the cervical one third of the mesial side of the crown and root.

Answer 54

maxillary first premolar

Question 55

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Maxillary premolar that has the longer sharper buccal cusp.

Answer 55

maxillary first premolar

Question 56

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Largest maxillary premolar.

Answer 56

maxillary first premolar

Question 57

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Mandibular premolar with the longest and sharpest buccal cusp.

Answer 57

mandibular first premolar

Question 58

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Maxillary premolar that is most symmetrical (occlusal view).

Answer 58

a. maxillary second premolar | b. Two premolars without a central groove. mandibular first premolar, mandibular second premolar (three-cusp type)

Question 59

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Crowns tipped lingually with respect to the root axis line (proximal view).

Answer 59

mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type).

Question 60

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). From buccal view, crown is tipped distally from the root axis.

Answer 60

mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type).

Question 61

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Mesial marginal ridge is more cervically located than its distal marginal ridge.

Answer 61

mandibular first premolar

Question 62

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Has no transverse ridge.

Answer 62

mandibular second premolar (three-cusp type)

Question 63

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Has the longer central groove.

Answer 63

maxillary first premolar

Question 64

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Has two major cusps almost the same size and length.

Answer 64

maxillary second premolar

Question 65

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Has a central fossa.

Answer 65

mandibular second premolar (three-cusp type)

Question 66

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Premolars with only two fossae: both are triangular fossae.

Answer 66

maxillary first premolar, maxillary second premolar

Question 67

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Has a central fossa and two triangular fossae.

Answer 67

mandibular second premolar (three-cusp type)

Question 68

Consider: maxillary first premolar, maxillary second premolar, mandibular first premolar, mandibular second premolar (two-cusp type), mandibular second premolar (three-cusp type). Has a lingual groove.

Answer 68

mandibular second premolar (three-cusp type)

Question 69

For each molar, name the correct geometric shape for its occlusal outline. a. trapezoid b. parallelogram (rhomboid) c. heart-shaped or triangular d. pentagon

Answer 69

B Maxillary first molar B Maxillary second molar (four-cusp type) C Maxillary second molar (three-cusp type) D Mandibular first molar A Mandibular second molar

Question 70

Consider the incisors. | M-D dimension of crown is larger than the labiolingual dimension?

Answer 70

both maxillary incisors

Question 71

Consider the incisors. | The incisal ridge exhibits a distolingual twist?

Answer 71

maxillary central, mandibular lateral

Question 72

Consider the incisors. | The root is very narrow M-D with M and D root depressions.

Answer 72

both mandibular incisors

Question 73

Consider the incisors. | The incisal edge is positioned more to the lingual of the root axis line?

Answer 73

both mandibular incisors

Question 74

Consider the incisors. | The distal proximal height of contour is more cervical than the mesial height of contour.

Answer 74

all BUT mandibular central incisors

Question 75

Consider the incisors. | This tooth has the widest (M-D) incisor crown.

Answer 75

maxillary central incisor

Question 76

Consider the incisors. | This tooth has the shortest root relative to its crown.

Answer 76

maxillary central incisor

Question 77

Consider the incisors. | This tooth is the most symmetrical incisor.

Answer 77

mandibular central incisor

Question 78

Consider the incisors. | This tooth has the largest curvature of the mesial cervical line.

Answer 78

maxillary central incisor

Question 79

Consider the incisors. | This tooth has the narrowest incisor crown (M-D).

Answer 79

mandibular central incisor

Question 80

Which of the following permanent tooth crowns are likely to be wider mesiodistally than faciolingually? a. 13 b. 3 c. 27 d. 23 e. 8

Answer 80

e

Question 81

When viewed from the facial, which of the following permanent teeth has a mesial cusp ridge longer than its distal cusp ridge? a. maxillary first premolar b. maxillary second premolar c. mandibular first premolar d. mandibular second premolar e. maxillary canine

Answer 81

a

Question 82

Which of the following statements is applicable to both the maxillary first premolar and the mandibular second premolar? a. One root is present. b. The number of cusps is relatively constant. c. The crown is concave on its mesial surface. d. The root is extremely concave on the mesial surface. e. The lingual cusp is lower in height than the facial cusp.

Answer 82

e.

Question 83

Which permanent premolar has a triangular occlusal table and a diamond shape occlusal outline?

Answer 83

mandibular first

Question 84

Which of the following permanent anterior teeth has the largest crown-root ratio? a. maxillary central b. maxillary lateral c. mandibular central d. maxillary canine

Answer 84

d

Question 85

When viewing from a proximal view, the incisal edge of the maxillary central incisor is: a. following midroot axis b. facial of midroot axis c. lingual of midroot axis d. none of the above

Answer 85

b

Question 86

Which of the following permanent teeth is more likely to have five cusps? a. mandibular 2nd premolar b. mandibular 1st molar c. mandibular 2nd molar d. maxillary 2nd molar e. none of the above

Answer 86

b

Question 87

Permanent mandibular molars are distinguished from permanent maxillary molars in that most permanent mandibular molars have: a. two roots, one buccal and one lingual b. crowns that are broader faciolingually than mesiodistally c. lingual cusps almost equal in size d. crow axis inclined toward the facial e. a fifth (cusp of carabelli) on ML cusp

Answer 87

c

Question 88

Which of the following group of teeth have oblique ridges? a. maxillary premolars b. maxillary molars c. mandibular premolars d. mandibular molars e. canines

Answer 88

b

Question 89

Which of the following statements is true about the roots of the maxillary first molar? a. the MB root is wide mesiodistally. b. the lingual root is the shortest c. the MB root is wide faciolingually. d. none of the above.

Answer 89

c

Question 90

The roots of maxillary molars are...

Answer 90

lingual, mesiobuccal, and distobuccal

Question 91

Which secondary (adult) maxillary tooth has the mesial cusp ridge of its buccal cusp longer than the distal cusp ridge? a. maxillary first premolar b. maxillary second premolar c. maxillary canine d. mandibular first premolar e. mandibular second premolar

Answer 91

a

Question 92

Which anterior teeth are wider mesiodistally than incisocervically? a. primary central incisors b. primary canines c. secondary central incisors d. secondary canines e. Both the primary central incisors and the secondary central incisors

Answer 92

a

Question 93

Which cusp is the smallest cusp on maxillary molars? a. mesiobuccal b. distobuccal c. mesiolingual d. distolingual e. distal

Answer 93

d

Question 94

Which two teeth exhibit a mesial cusp ridge of the facial cusp longer than the distal cusp ridge? a. permanent maxillary first premolar and permanent (secondary) mandibular first premolar b. permanent (secondary) mandibular first premolar and primary canine c. permanent (secondary) mandibular first premolar and primary mandibular first molar d. primary maxillary first molar and primary mandibular first molar e. primary maxillary canine and permanent (secondary) maxillary first premolar.

Answer 94

e

Question 95

Which is the largest cusp on maxillary first molars? a. mesiobuccal b. distobuccal c. mesiolingual d. distolingual e. distal

Answer 95

C

Question 96

Which of the following traits can be used to distinguish maxillary first molars from maxillary second molars? a. the maxillary first molars have roots that are less spread out b. the maxillary first molars have furcation locations that are father from the cervical line c. only the maxillary first molars are narrower (mesiodistally) on their lingual half than on their buccal half d. only the maxillary first molars have an oblique ridge e. only the maxillary first molars are likely to have five cusps

Answer 96

E

Question 97

Which characteristic applies to ALL types of premolars? a. have two cusps b. have a buccal cusp with the mesial cusp ridge shorter than the distal cusp ridge c. have the mesial proximal contact area located more occlusally than the distal contact area d. have only two occlusal pits (mesial and distal) e. have the buccal crest of curvature more cervical than the lingual crest of curvature

Answer 97

E

Question 98

Which trait is true of BOTH mandibular first AND second molars? a. both have a distal cusp b. both have three roots c. both have a mesiobuccal groove d. both have a central groove running from mesial to distal pit e. both have buccal cusps longer than lingual cusps

Answer 98

D

Question 99

Which adult mandibular tooth has its mesial and distal proximal contact areas at the same level incisocervically? a. first premolar b. canine c. lateral incisor d. central incisor e. second premolar

Answer 99

D

Question 100

When holding both an extracted maxillary and mandibular incisor from the same mouth, which trait will apply only to the mandibular incisor? a. The mesiodistal dimension is wider compared to the incisocervical length b. The lingual anatomy is more prominent (marginal ridges pronounced and fossa deeper) c. From the proximal view, the incisal edge is labial to, or centered on, the mid-root axis d. Wear facets slope lingually on the incisal edge (that is, facets are more evident on the lingual surface at the incisal edge as opposed to on the labial surface) e. The crown outlines mesially and distally are flatter

Answer 100

E

Question 101

Which tooth exhibits less cervical line curvature on the disal aspect than on the mesial aspect? a. Maxillary central incisor b. Mandibular canine c. Mandibular first premolar d. Maxillary first premolar e. None of these teeth have the cervical line curvature less on the distal aspect than on the mesial aspect

Answer 101

E

Question 102

When holding an extracted maxillary and mandibular premolar from the same mouth, which trait (if any) can be used to distinguish the maxillary premolar from the mandibular premolar? a. the occlusal outline of a maxillary premolar is more rectangular (considerably wider mesiodistally than faciolingually) b. Maxillary premolars have relatively short, sometimes functionless, lingual cusps c. Maxillary premolars tip considerably toward the lingual relative to the long axis of the root d. Maxillary premolars are most likely to have lingual or mesiolingual grooves e. All statements are incorrect

Answer 102

E

Question 103

Which premolar is likely to be wider mesiodistally in the lingual half versus in the facial half (that is, taper narrower from lingual to facial) a. Maxillary first premolar b. Maxillary second premolar c. Mandibular first premolar d. Mandibular second premolar (2-cusp type) e. Mandibular second premolar (3-cusp type)

Answer 103

E

Question 104

Which premolar usually has a mesial crown caviatation (depression) continuous with a mesial root cavitation? a. Maxillary first premolar b. Maxillary second premolar c. Mandibular first premolar d. Mandibular second premolar (2-cusp type) e. Mandibular second premolar (3-cusp type)

Answer 104

A

Question 105

Which trait(s) can be used to distinguish maxillary first molars from maxillary second molars? a. Maxillary first molars often have a cusp of Carabelli on the mesiolingual cusp b. Maxillary first molars have a short root trunk c. Maxillary first molars have a larger distolingual cusp d. Both a and b can be used to distinguish these molars e. Statements a, b and c can all be used to distinguish maxillary first from maxillary second molars

Answer 105

E

Question 106

Which trait CANNOT be used to distinguish the mesial from the distal surface on a mandibular molar? a. The distobuccal cusp is shorter than the mesiobuccal cusp b. If there are three buccal cusps, the distal cusp is shorter than the distobuccal cusp c. Mandibular molars are wider buccolingually in the mesial half compared to the distal half d. The buccal crest of curvature (height of contour) is more cervical than the lingual crest of curvature e. The longest cusp is the mesiolingual cusp.

Answer 106

D

Question 107

On incisors, the number of lobes on the facial surface (which is the same as the number of mamelons on the incisal surface) is:

Answer 107

three

Question 108

When holding both an extracted maxillary and mandibular incisor from the same mouth, which characteristic will apply only to the maxillary incisor? a. the mesiodistal dimension is narrower compared to the incisocervical length b. the lingual anatomy is more prominent (marginal ridges pronounced and fossa deeper) c. the incisal edge is lingual to, or centered on, the mid-root axis d. wear facets slope labially on the incisal edge (that is, facets are more evident on the labial surface at the incisal edge as opposed to on the lingual surface) e. proximal contact areas (crests of curvature) are closer to the incisal edge

Answer 108

b

Question 109

When holding an extracted maxillary and mandibular canine from the same mouth, which characteristic(s) can be used to distinguish the maxillary canine? a. the maxillary canine has a less prominent cingulum b. the mesial side of the maxillary canine crown and root is relatively straight c. the incisal edge of the maxillary canine is located to the center of the tooth d. the cusp of the maxillary canine is more pointed e. all of the above

Answer 109

D

Question 110

Which of the following characteristics is normally seen on ALL types of permanent incisors? a. the proximal view is pentagon shaped (5 sided outline) b. the crown is wider in a mesiodistal dimension than in a faciolingual dimension c. the root is over twice as long as the crown d. the cervical lines curve more on the distal surface than on the mesial surface e. facial and lingual crests of curvature are located in the cervical third

Answer 110

E

Question 111

Which of the following teeth has the most symmetrical crown? a. maxillary lateral incisor b. mandibular lateral incisor c. mandibular central incisor d. mandibular canine e. maxillary canine

Answer 111

C

Question 112

Which premolar usually has a mesial crown cavitation? a. maxillary first premolar b. maxillary second premolar c. mandibular first premolar d. mandibular second premolar (two cusp type) e. mandibular second premolar (three-cusp type)

Answer 112

A

Question 113

Which teeth are most likely to have a mesiolingual groove? a. mandibular second premolar b. maxillary second molar c. mandibular first molar d. maxillary first premolar e. mandibular first premolar

Answer 113

E

Question 114

The cusp of Carabelli is located on which cusp of the maxillary first molar?

Answer 114

mesiolingual cusp

Question 115

Which posterior tooth is least likely to have a longitudinal root depression on both the mesial and distal surfaces? a. mandibular second premolar b. maxillary second premolar c. mandibular first premolar d. maxillary first premolar e. mandibular first molar: mesial root

Answer 115

A

Question 116

Which of the following bumps or ridges is NOT likely to be found on a mandibular first molar? a. triangular ridge of the mesiolingual cusp b. mesial cusp ridge of the distal cusp c. mesial marginal ridge d. transverse ridge e. oblique ridge

Answer 116

E

Question 117

Which of the following cusps is missing on a three-cusp type of maxillary second molar? a. mesiolingual b. mesiobuccal c. distolingual d. distobuccal e. distal

Answer 117

C

Question 118

Which, if any, of these teeth exhibit more cervical line curvature on the mesial aspect than on the distal aspect? a. maxillary central incisor b. maxillary canine c. mandibular canine d. all of the the above e. none of the above

Answer 118

D

Question 119

Which trait describes a mandibular canine when compared to a maxillary canine? a. Incisal wear (faceting) is usually more lingual on the mandibular canine b. The lingual ridge is more prominent on the mandibular canine c. The crown is wider mesiodistally on the mandibular canine compared to the maxillary canine d. The mesial crown outline is in line with the root on the mandibular canine e. The cusp angle (before wear) is more acute (sharper) on the mandibular canine

Answer 119

D

Question 120

Which tooth is least likely to have a cavitation on both the mesial and distal surfaces? a. Maxillary central incisor b. Mandibular central incisor c. Mandibular lateral incisor d. Maxillary canine e. Mandibular canine

Answer 120

A

Question 121

Which best describes the mesial incisal cusp ridge on a mandibular canine? a. M cusp ridge is longer than the distal ridge b. M cusp ridge meets the distal cusp ridge to form a sharp cusp tip c. M cusp ridge is almost horizontal d. M cusp ridge is almost vertical e. M cusp ridge is in alignment with the mesial root surface

Answer 121

C

Question 122

When holding both any maxillary and mandibular incisor, which characteristic is most likely to apply to the mandibular incisor but not the maxillary incisor a. The cingulum is off center toward the distal on mandibular incisors b. The incisal edge is more likely to be labial to the mid-root axis line on mandibular incisors. c. The root is more likely to be straight than bent to the distal on mandibular incisors d. The crown has lingual ridges and fossa that are more prominent on mandibular incisors e. From the incisal view, the labiolingual dimension is greater than the mesiodistal dimension on mandibular incisors.

Answer 122

E

Question 123

Which statement is true regarding ALL incisor crowns a. When viewed from the facial, distoincisal angles are more square than mesioincisal angles b. When viewed from the facial, the crown gets wider from the contact areas toward the cervical line c. When viewed from the facial, outlines are wedged-shaped d. When viewed from the proximal, lingual outlines are "S" shaped e. D contact areas are more cervical than M contacts

Answer 123

D

Question 124

Which of the following characteristics is seen most of the time on ALL permanent incisors a. The proximal view is pentagon shaped b. The crown is wider (in a mesiodistal dimension) than long (in an incisogingival dimension) c. Marginal ridges are found on the lingual surface d. The distoincisal angle is more acute (sharper) than the mesioincial angle e. Facial and lingual crests of curvature are located in the middle third

Answer 124

C

Question 125

Which premolars are most likely to have three cusps and a lingual groove a. maxillary first only b. mandibular first only c. mandibular second only d. mandibular first and second e. all premolars are equally likely to have three cusps and a lingual groove

Answer 125

C

Question 126

Which two permanent molars are most likely to have five cusps? a. maxillary first and second molars b. mandibular first and second molars c. maxillary first and mandibular first molars d. mandibular second and maxillary second molars e. maxillary first and mandibular second molars

Answer 126

C

Question 127

Which of the following traits does NOT apply to the maxillary first premolar? a. it usually has a mesial marginal ridge groove b. it has a mesial crown depression c. it has a greater cervical line curvature on the mesial than on the distal d. the lingual cusp is “bent” toward the mesial e. the mesial proximal contact is located more cervically than is the distal proximal contact

Answer 127

E

Question 128

Which of the following characteristics is seen most of the time on ALL permanent incisors? a. the proximal view is pentagon shaped b. the crown is wider (in a mesiodistal dimension) than long (in an incisogingival dimension) c. the root is longer than the crown d. the distoincisal angle is more acute (sharper) than the mesioincisal angle e. facial and lingual crests of curvature are located in the middle third

Answer 128

C

Question 129

Which tooth is normally wider mesiodistally than faciolingually when viewed from the incisal view? a. maxillary canine b. mandibular lateral incisor c. mandibular central incisor d. mandibular canine e. maxillary central incisor

Answer 129

E

Question 130

Which tooth is most likely to have its mesial cusp ridge of the buccal cusp longer than the distal cusp ridge? a. maxillary first premolar b. maxillary second premolar c. mandibular first premolar d. mandibular second premolar e. maxillary canine

Answer 130

A

Question 131

Which of the following teeth is most likely to have mamelons? a. maxillary central incisor b. maxillary canine c. mandibular canine d. all of the above e. none of the above

Answer 131

A

Question 132

Which premolars that are most likely to have three cusps and a lingual groove? a. maxillary first b. mandibular first c. mandibular first d. mandibular second e. mandibular first and second

Answer 132

D

Question 133

What ridges are made up of two triangular cusp ridges a. marginal b. mesial cusp slope or ridge c. transverse ridge d. oblique ridge e. both c and d

Answer 133

E

Question 134

When viewed from the proximal surface, what is the location of the facial crest of curvature on all teeth a. in the occlusal third b. in the incisal third c. in the middle third d. in the cervical third e. in the proximal third

Answer 134

D

Question 135

When referring to maxillary tooth surfaces, what term is the same as lingual a. palatal b. apical c. mesial d. buccal e. labial

Answer 135

A

Question 136

Which of the following is NOT one of the four cusp ridges (of the gothic pyramid) on the buccal cusp of a premolar? a. marginal ridge b. distal cusp ridge c. mesial cusp ridge d. buccal cusp ridge e. triangular ridge

Answer 136

A