Deck 2: The Tooth: Functions and Terms

Question 1

All of the following formations are depressions EXCEPT one. Which one is the EXCEPTION?

A) Fossa
B) Marginal ridge
C) Developmental groove
D) Lingual pit
E) All of the above are depressions.

Answer 1

B
A ridge is an elevated portion of a tooth that runs in a line and is named for the specific location in which it occurs. Specifically, marginal ridges are the rounded borders of enamel that form the mesial and distal elevated shoulders of the occlusal surfaces of posterior teeth as well as the mesial and distal shoulders of the lingual surfaces of anterior teeth. Fossas, grooves, and pits are depressed formations within the tooth. They are also described as concavities, indented areas, or simply concave structures. A fossa is broadly defined as a depression or concavity. Developmental grooves are shallow, depressed lines that separate primary parts of the crown or root. A pit is a pinhole evident within a fossa or anywhere on a tooth. A lingual pit occurs on the lingual surface of a tooth.

Question 2

Which dental tissue is composed of 70% inorganic and 30% organic matter?

A) Dentin
B) Enamel
C) Cementum
D) Bone

Answer 2

A
The chemical composition of dentin is 70% inorganic and 30% organic matter and water. Dentin is softer than enamel but harder than cementum or bone. Dentin, the tissue forming the greatest bulk of the tooth, is yellow in color and elastic in nature. It is wrapped in an envelope of enamel covering the crown and an envelope of cementum covering the tooth.

Question 3

In the illustration below, structure "a" represents the

A) Distal marginal ridge
B) Mesial marginal ridge
C) Lingual fossa
D) Lingual groove

Answer 3

C
Structure "a" in the illustration is the lingual fossa. A fossa is a depression, concavity, or an area on the tooth that is indented. Fossae are named for their location; the fossa represented in the question is a lingual fossa. Structures "b," "c," and "d," respectively, are the mesial marginal ridge; the lingual groove; and the distal marginal ridge.

Question 4

Each of the following teeth is developed from four lobes EXCEPT one. Which one is the EXCEPTION?

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

Question 5

In a partially erupted tooth, the visible portion is called the clinical crown. The anatomic crown is not yet fully formed.

A) Both statements are true.
B) The first statement is true; the second is false.
C) The first statement is false; the second is true.
D) Both statements are false.

Question 6

Each of the following terms refers to an "in-between" surface EXCEPT one. Which one is the EXCEPTION?

A) Facial
B) Mesial
C) Distal
D) Proximal

Question 7

The prominence on the cervical third of the lingual aspect of anterior teeth is called the

A) Cervical line
B) Lingual ridge
C) Marginal ridge
D) Cingulum
E) Lingual cusp

Question 8

The CEJ is where the enamel meets the

A) Dentin
B) Junction
C) Cementum
D) Cervical third

Question 9

The sensation of pain is felt in which part of the tooth?

A) Enamel
B) Dentin
C) Cementum
D) Pulp

Question 10

In the illustration below, structure "b" is the

A) Distal marginal ridge
B) Mesial marginal ridge
C) Lingual fossa
D) Lingual groove

Question 11

The function of both incisors and premolars is to cut food. The function of molars is to cut, grind, and chew food.

A) Both statements are true.
B) The first statement is true; the second statement is false.
C) The first statement is false; the second statement is true.
D) Both statements are false.

Question 12

Which of the following is an example of a line angle?

A) Mesiolabioincisal
B) Buccolingual
C) Mesiodistal
D) Labioincisal
E) Inciso-occlusal

Question 13

The tooth surface facing the lip is called the mesial surface. The corresponding surface facing the cheek is called the distal surface.

A) Both statements are true.
B) The first statement is true; the second statement is false.
C) The first statement is false; the second statement is true.
D) Both statements are false.

Question 14

Which structure separates primary parts of a crown or root?

A) Marginal ridge
B) Developmental groove
C) Developmental pit
D) Transverse ridge
E) Both b and c

Question 15

The hard yellow tissue that makes up the bulk of the tooth is called the

A) Enamel
B) Dentin
C) Cementum
D) Pulp

Question 16

In the illustration below, structure "c" is the

A) Distal marginal ridge
B) Mesial marginal ridge
C) Lingual fossa
D) Lingual groove

Question 17

None of the following tissues have the ability to regenerate EXCEPT one. Which one is the EXCEPTION?

A) Enamel
B) Dentin
C) Pulp
D) Periodontal ligament

Question 18

The dental tissue that most resembles bone is

A) Cementum
B) Dentin
C) Enamel
D) None of the above

Question 19

How many surfaces does a posterior tooth have?

A) 2
B) 3
C) 4
D) 5
E) 6

Question 20

Pulp canals

A) Are located in the crown portion
B) Have hornlike projections
C) Occupy the root portion
D) Occupy both the crown and root portion

Question 21

The part of the tooth that shows when someone opens their mouth is the anatomic crown.

Question 22

The pulp is composed of which of the following tissues (select all that apply)?

A) Lymph tissue
B) Connective tissue
C) Nerve tissue
D) Odontoblasts
E) Alveolus

Question 23

In the illustration below, structure "d" is the

A) Distal marginal ridge
B) Mesial marginal ridge
C) Lingual fossa
D) Lingual groove

Question 24

All anterior teeth have cusps.

Question 25

In the following illustration, structure "a" refers to a fossa, which is a convexity or bulge on a tooth. Structure "b" refers to a ridge, which is a concavity or depression within a tooth.

A) Both statements are true.
B) The first statement is true; the second statement is false.
C) The first statement is false; the second statement is true.
D) Both statement are false.

Question 26

Which of the following structures represent a concavity or depression within the surface of a tooth (select all that apply)?

A) Pit
B) Fossa
C) Tubercle
D) Cusp
E) Groove

Question 27

Roots of molars can be bifurcated or trifurcated.

Question 28

Mesio-occlusodistal is a location of a point angle.

Question 29

Cellular cementum has the ability to reproduce itself.