TOOTH MORPHOLOGY

Question 1

This is the portion of the tooth covered with enamel

Answer 1

Crown

Question 2

This is the portion of the tooth covered with
cementum, it can be mono-rooted, bi-rooted (2),
multi-rooted (3 roots).

Answer 2

Root

Question 3

What are the 4 major tissues of the tooth?

Answer 3

Enamel, dentin, pulp, and cementum

Question 4

What are the hard tissues of the tooth?

Answer 4

Enamel, dentin, and cementum

Question 5

What is the soft tissue of the tooth?

Answer 5

Pulp

Question 6

This is the white, protective external surface layer of the anatomic crown; it is highly calcified or mineralized; the hardest substance in the body; it develops from the enamel organ(ectoderm); a product of specialized epithelial cells called ameloblasts

Answer 6

Enamel

Question 7

This is the hard yellowish tissue underlying the
enamel and cementum; it makes up the major bulk of the inner portion of each tooth crown and root; it develops from the embryonic dental papilla
(mesoderm); the cells that form this are called
odontoblast

Answer 7

Dentin

Question 8

What are the two junctions?

Answer 8

Cementodentinal junction and Dentinoenamel junction

Question 9

It is the inner surface of the enamel
cap where enamel joins dentin

Answer 9

Dentinoenamel junction

Question 10

This is the inner surface of cementum where cementum joins dentin

Answer 10

Cementodentinal junction

Question 11

This is the dull yellow external layer of the tooth
root; it is very thin, especially next to the cervical
line; it develops from the dental sac (mesoderm); it is produced by cells called cementoblasts

Answer 11

Cementum

Question 12

This separates the enamel of the crown from
the cementum of the anatomic root, this junction is also known as the cervical line, denoting that it surrounds the neck or cervix of the tooth.

Answer 12

Cementoenamel junction

Question 13

This is the soft tissue in the cavity or space in the
center of the crown and root called the pulp cavity; it develops from the dental papilla (mesoderm)

Answer 13

Pulp

Question 14

This is the cavity which contains the coronal pulp

Answer 14

Pulp chamber

Question 15

This is located in the crown area

Answer 15

Coronal pulp

Question 16

This contains the radicular pulp

Answer 16

Root canal

Question 17

This is the pulp in the root area

Answer 17

Radicular pulp

Question 18

This is the anatomic area at the tip/end of the root.

Answer 18

Apex

Question 19

This is the opening at the apex of the root of a tooth, through which the nerve and blood vessels that supply the dental pulp pass.

Answer 19

Apical foramen

Question 20

This is that part of the tooth normally covered by an enamel layer.

Answer 20

Anatomic crown

Question 21

This refers specifically to the amount of tooth visible in the oral cavity

Answer 21

Clinical crown

Question 22

This is defined as the supporting tissues of the teeth in the mouth, including surrounding alveolar bone, the gingiva, the periodontal ligament, and the outer, cementum layer of the tooth roots.

Answer 22

Periodontium

Question 23

This is the portion of the upper (maxillary) or lower (mandibular) bones that surrounds the roots of the teeth.

Answer 23

Alveolar bone

Question 24

This is the part of the soft tissue in the mouth that covers the alveolar bone of the jaws.

Answer 24

Gingiva

Question 25

This is firmly bound to the underlying alveolar bone; the portion of the gingiva extending from the gingival margin to the alveolar mucosa

Answer 25

Attached gingiva

Question 26

A collar of thin gingiva that surrounds each tooth; it is not attached.

Answer 26

Free gingiva/Marginal gingiva

Question 27

This is part of the collar of free gingiva that extends between the teeth.

Answer 27

Interdental/Interproximal papilla

Question 28

This is a very thin ligament composed of many tissue fibers that attach the outer layer of the tooth root to the thin layer of dense alveolar bone surrounding each tooth.

Answer 28

Periodontal ligament

Question 29

This is a pyramidal elevation, or peak, located on the occlusal surfaces of molars and premolars, and on the incisal edges of canines.

Answer 29

Cusps

Question 30

This is a small elevation on some portion of the crown produced by an extra formation of enamel.

Answer 30

Tubercle

Question 31

This is the inclined surfaces or slopes that converge toward the cusp tip to form an angle.

Answer 31

Cusp slopes/Cusp arms

Question 32

This is located on the mesial and distal border of the lingual surface and converge toward the cingulum.

Answer 32

Marginal ridges (anterior)

Question 33

This is located on the mesial and distal borders of the occlusal surface.

Answer 33

Marginal ridges (posterior)

Question 34

These are located on each major cusp of posterior teeth. Each triangular ridge extends from a cusp tip toward the depression (sulcus) in the middle of the occlusal surface faciolingually.

Answer 34

Triangular ridge

Question 35

This is when a triangular ridge from a facial cusp joins with a triangular ridge from an adjacent lingual cusp, the two ridges together form a longer ridge.

Answer 35

Transverse ridge

Question 36

This is found only on maxillary molars It crosses the occlusal surface obliquely and is made up of one ridge on the mesiolingual cusp joining with the triangular ridge of the distobuccal cusp.

Answer 36

Oblique ridge

Question 37

This is a subtle ridge running cervicoocclusally in the middle third of the buccal surface of premolars.

Answer 37

Buccal cusp ridge

Question 38

This runs cervicoincisally and can be very prominent on maxillary canines.

Answer 38

Labial ridge

Question 39

This is the outline of the entire tooth crown from the occlusal view.

Answer 39

Crown outline

Question 40

This is the outline of the smaller occlusal surface that is bounded by adjoining mesial and distal cusp ridges and marginal ridges that surround it.

Answer 40

Occlusal table

Question 41

This is the enlargement or bulge on the cervical third of the lingual surface of the crown on anterior teeth.

Answer 41

Cingulum

Question 42

This is found on the facial surface of permanent molars (and all primary teeth), the subtle ridge running mesiodistally in the cervical one third of the facial surface of a crown. It is most pronounced on the outline of the mesiobuccal cusp of mandibular second molars.

Answer 42

Cervical ridge

Question 43

These are three small tubercles or scallops, each formed from one of the three facial developmental lobes on the incisal edges of newly erupted incisors.

Answer 43

Mamelons

Question 44

These are the numerous, minute horizontal ridges on the enamel of newly erupted permanent teeth.

Answer 44

Perikymata

Question 45

This is where the nerves and blood vessels enter into the tooth pulp.

Answer 45

Apical foramen

Question 46

This is neck of the tooth is the slightly constricted region of union of the crown and the root.

Answer 46

Cervix

Question 47

This is the trunk base is the part of the root of a multi-rooted molar or tworooted premolar next to the cementoenamel junction that has not yet split

Answer 47

Root trunk

Question 48

This is the place on multirooted teeth where the root trunk divides into separate roots.

Answer 48

Furcation

Question 49

This is seen on two-rooted teeth.

Answer 49

Bifurcation

Question 50

This is seen on three-rooted teeth

Answer 50

Trifurcation

Question 51

This is the interradicular space is the region or space between two or more roots, apical to the place where the roots divide from the root trunk

Answer 51

Furcal region

Question 52

This is when the amount of curvature is greater on the mesial surface than on the distal surface of the same tooth

Answer 52

CEJ line

Question 53

These are found on molars and premolars on the occlusal surfaces mesial or distal to marginal ridges.

Answer 53

Triangular fossa

Question 54

These are the major, sharply defined narrow, linear depressions formed during tooth development and usually separating the lobes or major portions of a tooth.

Answer 54

Developmental grooves

Question 55

Tooth with longest crown.

Answer 55

Mandibular canine

Question 56

Tooth with longest crown (according to woefel research)

Answer 56

Maxillary incisor

Question 57

Longest tooth overall

Answer 57

Maxillary canine

Question 58

Widest tooth mesiodistally

Answer 58

Mandibular first molar

Question 59

Widest tooth buccolingually

Answer 59

Maxillary first molar

Question 60

Narrowest tooth mesiodistally

Answer 60

Mandibular central incisor

Question 61

This refers to the amount of tooth that is not visible since it is covered with gingiva.

Answer 61

Clinical root

Question 62

This is the part of a tooth covered by cementum.

Answer 62

Anatomic root

Question 63

This is the potential space between the free gingiva and the tooth

Answer 63

Gingival sulcus

Question 64

This cusp is only found at the maxillary first molars; this is a small additional cusp at the mesiopalatal line angle of maxillary first molars.

Answer 64

Cusp of carabelli