Chapter 2, 3, 8 Tooth, Curvatures, Structures (1)

Question 1

crown

Answer 1

part of the tooth covered with enamel

Question 2

root

Answer 2

portion of a tooth embedded in the alveolar process and covered with cementum

Question 3

enamel

Answer 3

hard, calcified tissue that covers the dentin of the crown of a tooth at eruption

Question 4

cementum

Answer 4

layer of bonelike tissue covering the root of the tooth

Question 5

cementoenamel junction (CEJ)

Answer 5

junction of enamel of the crown and and cementum of the root

Question 6

cervical line

Answer 6

line formed by the junction of the enamel and cementum on a tooth

Question 7

crown portion erupts through ___ and ___

Answer 7

bone and gingival tissue

Question 8

after eruption of a tooth it will never be covered with ____

Answer 8

gingiva

Question 9

gingiva

Answer 9

part of the gum tissue that immediately surrounds the teeth and alveolar bone

Question 10

anatomic crown

Answer 10

crown covered by enamel

Question 11

clinical crown

Answer 11

only part seen above the gingiva

Question 12

clinical root

Answer 12

part of the tooth embedded in the gingiva and socket

Question 13

eruption

Answer 13

movement of the tooth as it emerges through surrounding tissue so that the clinical crown gradually appears longer

Question 14

coronal area

Answer 14

crown area that is most incisal or occlusal

Question 15

cervical area

Answer 15

area that forms the junction of the crown and root

Question 16

apical area

Answer 16

ends at the terminal end of the root

Question 17

cervix

Answer 17

narrow region at the junction of the crown and root

Question 18

apex

Answer 18

endpoint or farthest tip as of the tooth root

Question 19

apical foramen

Answer 19

opening at or near the apex of a tooth root through which the blood and nerve supply of the pulp enters the tooth

Question 20

dental arch

Answer 20

all the teeth in either the maxillary or mandibular jaw that form an arch

Question 21

alveolar process

Answer 21

part of the bone in the maxillae and mandible that forms the sockets for the teeth

Question 22

alveolus

Answer 22

cavity or socket in the alveolar process in which the root of the tooth is held

Question 23

single root

Answer 23

root with one main branch

Question 24

multiple roots

Answer 24

root with more than one branch

Question 25

bifurcation

Answer 25

division into two parts or branches, as any two roots of a tooth

Question 26

trifurcation

Answer 26

division of three tooth roots at their point of junction with the root trunk

Question 27

furcal region

Answer 27

area between multirooted teeth

Question 28

The root-to-crown ratio is determined by dividing the length of ____ by the length of ____. How does this affect a tooth's resistance to displacement

Answer 28

The root-to-crown ratio is determined by dividing the length of the root by the length of the crown. Almost all teeth have longer roots than crowns, so the root-to-crown ratio is almost always 1 or higher than 1. The higher the root-to-crown ratio number, the more resistant the tooth will be to displacement.

Question 29

What is the difference between the alveolus and the alveolar process?

Answer 29

The alveolar process is the portion of alveolar bone that supports the teeth. The alveolus is the bony socket within the alveolar process where the tooth fits.

Question 30

four tooth tissues

Answer 30

enamel, dentin, cementum, and dental pulp

Question 31

hard tissues examples

Answer 31

enamel, dentin, cementum

Question 32

soft tissue examples

Answer 32

dental pulp

Question 33

describe enamel

Answer 33

Enamel is the most dense and hardest tissue in the human body. It is composed of 96% inorganic matter and 4% organic matter and water.

Question 34

Which tooth tissue composes the bulk of the tooth?

Answer 34

Dentin composes the bulk of the tooth because it makes up the majority of the crown and root portions.

Question 35

What is the percentage of inorganic material in enamel? In dentin? In cementum?

Answer 35

Enamel is composed of 96% inorganic matter and 4% organic matter and water. Dentin is made of 70% inorganic matter and 30% organic matter and water. Cementum is composed of 45% to 50% inorganic and 50% to 55% organic matter.

Question 36

incisors

Answer 36

cut

Question 37

canines

Answer 37

holding or grasping

Question 38

premolar

Answer 38

usually have at least two cusps rather than one incisal edge; grind

Question 39

molars

Answer 39

4 or more cusps; crushing

Question 40

anterior teeth have ____ surfaces

Answer 40

4 and a ridge

Question 41

posterior teeth have ____ surfaces

Answer 41

5

Question 42

anterior surfaces

Answer 42

mesial, distal, facial (or labial), and incisal surfaces, along with the lingual surface

Question 43

posterior surfaces

Answer 43

occlusal, distal, mesial, buccal, and lingual surfaces