Deck 9: Tooth Morphology

Question 1

Place the teeth in the correct order from the midline backward.
1) Lateral
2) Molars
3) Centrals
4) Cuspids
5) Premolars

A) 1, 2, 3, 4, 5
B) 3, 1, 4, 5, 2
C) 2, 5, 4, 1, 3
D) 2, 4, 5, 3, 1

Answer 1

3, 1, 4, 5, 2

Question 2

All deciduous teeth are usually fully erupted by the age of ____________.

A) 1 year
B) 2 years
C) 3 years
D) 6 years

Answer 2

3 years

Question 3

The period of mixed dentition is ______ years.

A) 2 to 3
B) 2 to 6
C) 6 to 12
D) 12 to 21

Answer 3

6 to 12

Question 4

The first permanent tooth usually erupts at age ____________.

A) 6 months
B) 6 years
C) 12 years
D) 21 years

Question 5

Usually by age ____, all the deciduous teeth have exfoliated.

A) 3
B) 6
C) 12
D) 21

Question 6

The clinical crown is defined as the portion of the tooth ____________.

A) covered with enamel
B) covered with cementum
C) visible in the mouth
D) visible on a radiograph

Question 7

The root and the crown are divided by the cervical line.

Question 8

A person's first tooth usually erupts at about age ____________.

A) 6 months
B) 12 months
C) 24 months
D) 6 years

Question 9

The adult dentition has on average how many permanent teeth?

A) 5
B) 16
C) 32
D) 20

Question 10

The first permanent teeth to erupt are the ____________.

A) mandibular centrals
B) mandibular first molars
C) maxillary cuspids
D) maxillary centrals

Question 11

Which permanent teeth are not succedaneous?

A) Centrals
B) Cuspids
C) Premolars
D) Molars

Question 12

The first molars erupt before the cuspids.

Question 13

On the mandibular cuspid, the mesial cusp slope is longer than the distal cusp slope.

Question 14

The oral cavity contains how many quadrants?

A) One
B) Two
C) Three
D) Four

Question 15

The study of the structure and form of the teeth is ____________.

A) tooth morphology
B) embryology
C) histology
D) none of the above

Question 16

Deciduous teeth have large pulp chambers; greater care should be given during a coronal polish so as not to overheat the tooth.

Question 17

All teeth have how may surfaces?

A) Two
B) Three
C) Four
D) Five

Question 18

The anterior teeth are from ____________.

A) lateral to lateral
B) cuspid to cuspid
C) first premolar to first premolar
D) maxillary to mandibular

Question 19

In the permanent dentition, the wisdom teeth can also be referred to as the third molar.

Question 20

How many teeth are found in each arch in the deciduous dentition?

A) 5
B) 8
C) 10
D) 20

Question 21

The elevated area of enamel that forms the mesial and distal borders of each tooth is the _______ ridge.

A) transverse
B) triangular
C) oblique
D) marginal

Question 22

Which premolar is often considered for removal for orthodontic treatment?

A) Maxillary first
B) Maxillary second
C) Mandibular first
D) Mandibular second

Question 23

Which tooth has the longest root in the maxillary arch?

A) Central
B) First molar
C) Cuspid
D) Lateral

Question 24

Which teeth are sometimes congenitally missing?

A) Maxillary centrals
B) Mandibular centrals
C) Maxillary cuspids
D) Maxillary laterals

Question 25

Which teeth are often called the "cornerstone of the mouth"?

A) Centrals
B) First molars
C) Cuspids
D) Laterals

Question 26

The tooth surface that is on the cheek side of the posterior teeth is ____________.

A) buccal
B) lingual
C) mesial
D) distal

Question 27

Which premolar has two roots?

A) Maxillary first
B) Maxillary second
C) Mandibular first
D) Mandibular second

Question 28

The tooth that contains the cusp of Carabelli is the ____________.

A) maxillary third molar
B) maxillary first molar
C) mandibular first molar
D) none of the above

Question 29

Which teeth play an important role in speech?

A) Molars
B) Cuspids
C) Incisors
D) Premolars

Question 30

An elevation of enamel that descends from the cusp into the middle area of the occlusal surface is the _________ ridge.

A) transverse
B) triangular
C) oblique
D) marginal

Question 31

The union of two triangular ridges that produces one ridge across the occlusal surface is the ________ ridge.

A) transverse
B) occlusal
C) oblique
D) marginal

Question 32

The opening in the apical portion of each root is the ____________.

A) buccal groove
B) cingulum
C) apex
D) apical foramen

Question 33

The smallest permanent tooth in the dentition is the ____________.

A) maxillary third molar
B) mandibular central
C) mandibular lateral
D) mandibular third molar

Question 34

The dividing point of a multirooted tooth is the ____________.

A) grooves
B) furcation
C) fossa
D) cingulum

Question 35

Three bulges on the incisal edges of newly erupted centrals are the ____________.

A) mamelons
B) lingual grooves
C) fossae
D) cingula

Question 36

The elevated area of enamel that extends obliquely across the tooth is the ________ ridge.

A) transverse
B) triangular
C) oblique
D) marginal

Question 37

The shallow rounded or angular depression found on tooth surfaces is the ____________.

A) buccal groove
B) lingual groove
C) fossa
D) cingulum

Question 38

The tooth surface that is on the tongue side is the ____________.

A) facial
B) lingual
C) mesial
D) distal

Question 39

The convex area on the lingual surfaces of the anterior teeth is the ____________.

A) buccal groove
B) lingual groove
C) lingual fossa
D) cingulum

Question 40

If a tooth has two roots, it is considered ____________.

A) bifurcated
B) trifurcated
C) concave
D) none of the above

Question 42

A tooth that has the characteristics of a buccal cusp and two lingual cusps is termed ____________.

A) bifurcate
B) bicanineate
C) tricanineate
D) trifurcate

Question 43

Identify the tooth in the illustration above.

A) Maxillary central
B) Maxillary lateral
C) Mandibular central
D) None of the above

Question 44

On the tooth, the ____________ refers to where the proximal side of two teeth come together and touch (mesial of one and distal of the other).

A) incisal
B) furcation
C) contact
D) gingival-third

Question 45

Identify the tooth in the illustration above.

A) Maxillary second premolar
B) Maxillary first molar
C) Maxillary first premolar
D) None of the above

Question 46

Identify the tooth in the illustration above.

A) Maxillary central
B) Mandibular lateral
C) Mandibular central
D) None of the above

Question 47

Identify the tooth in the illustration above.

A) Maxillary first molar
B) Maxillary second molar
C) Mandibular first molar
D) Mandibular second molar

Question 48

Which tooth has a nonfunctioning lingual cusp?

A) Mandibular first premolar
B) Mandibular second premolar
C) Mandibular first molar
D) Mandibular second molar

Question 49

A space or gap between the teeth is called a ____________.

A) fissure
B) diastoma
C) pit
D) bifurcation

Question 50

____________ is a linear depression forming a groove that extends from the middle of the buccal surface to the occlusal surface of the tooth.

A) Incisal-third
B) Developmental groove
C) Buccal groove
D) Cingulum

Question 51

Identify the tooth in the illustration above.

A) Maxillary central
B) Maxillary lateral
C) Mandibular central
D) None of the above

Question 52

The teeth in the permanent dentition that are farthest from the midline are the  ____________.

A) canines
B) first and second premolars
C) first and second molars
D) wisdom teeth

Question 53

Identify the tooth in the illustration above.

A) Mandibular second molar
B) Maxillary second molar
C) Mandibular first molar
D) Maxillary first molar

Question 54

____________ is a developmental groove where decay often initiates this imperfect union.

A) Fossa
B) Cusp of Carabelli
C) Fissure
D) Embrasure

Question 55

The tooth that appears to have four equally sized cusps is the

A) Mandibular first premolar
B) Mandibular second premolar
C) Mandibular first molar
D) Mandibular second molar

Question 56

Which tooth has two pulp canals in one of its roots?

A) Mandibular first premolar
B) Mandibular second premolar
C) Mandibular first molar
D) Mandibular second molar

Question 57

Identify the tooth in the illustration above.

A) Mandibular first molar
B) Mandibular second molar
C) Mandibular third molar
D) None of the above