Nbde Dental Anatomy T-Terms

Front 1

The _____ of a sulcus meet in a developmental groove or extend outward to the cusp tips.

Back 1

Inclines

Front 2

irregular depression or concavity

Back 2

Fossa

Front 3

Small pinpoint depressions located at the junction of developmental grooves or at terminals of those grooves

Back 3

Pits

Front 4

A narrow channel or crevice sometimes deep formed at the depth of a developmental groove.

Back 4

Fissure

Front 5

Triangular shaped spaces located between the proximal surfaces of adjacent teeth. Diverge buccally, cervically, lingually, and occlusally from the contact area.

Back 5

Embrasures

Front 6

Why must embrasures be symmetrical?

Back 6

For esthetics and function

Front 7

What are the three functions of an embrasure?

Back 7

1. Function as spillways for food to move away from the gingiva
2. Teeth more self-cleansing
3. Protect and stimulate the gingiva

Front 8

Why are lingual embrasures larger than facial embrasures?

Back 8

Most teeth are narrower on lingual and contacts are toward the facial

Front 9

What can the loss of a proximal contact lead to?

Back 9

Periodontal disease, malocclusion, food impaction, or drifting of teeth

Front 10

If you see mamelons in an older patient what is their most likely malocclusion?

Back 10

Ant. Open bite

Front 11

How many groups do mamelons develop in?

Back 11

Groups of 3

Front 12

When mamelons develop in anterior teeth where do they develop from?

Back 12

Originate from four lobes

Front 13

Why is it that mamelons are so noticable on emergence?

Back 13

Made of pure enamel with no dentin layer underneath.

Front 14

Why do mamelons appear to be a different shade from the rest of the tooth?

Back 14

They are translucent

Front 15

Sharply defined, shallow, linear depressions

Back 15

Developmental Grooves

Front 16

Separate lobes or cusps of teeth and mark the boundaries between adjacent cusps and other major divisional parts of the tooth

Back 16

Developmental grooves

Front 17

Where are pits located?

Back 17

Junction of developmental grooves

Front 18

Small, less distinct, irregularly placed grooves. Do not demarcate major divisional parts of a tooth.

Back 18

Supplemental grooves

Front 19

The portion of the gingiva that fills the interproximal space?

Back 19

Interdental space

Front 20

What is the shape of the interproximal space?

Back 20

Triangular

Front 21

Occlusal (incisal boarder) at which the gingiva meets the tooth.

Back 21

Gingival Margin

Front 22

The collar of tissue that is not attached to the tooth or alveolar bone. Surrounds the root of each tooth from the gingival margin to form the collar of space or gingival crevice or sulcus.

Back 22

Free gingiva

Front 23

Band or zone of gray light or coral pink keratinized masticatory mucosa that is firmly bound down to the underlying bone.

Back 23

Attached gingiva

Front 24

What layers are on either side of the attached gingiva?

Back 24

Free Gingiva and Alveolar Mucosa

Front 25

What ridge is unique to only permanent max. molars?

Back 25

Oblique ridge

Front 26

The oblique ridge of Max. molars is formed by what?

Back 26

Distal cusp ridge of mesiolingual cusp and triangular cusp ridge of the distobuccal cusp
Forms distal boundary of central fossa

Front 27

Runs cervico-incisally in approx. the center of the labial surface of canines

Back 27

Labial ridge

Front 28

Runs cervico-occlusally in approx. the center of the buccal suface of premolars

Back 28

Buccal ridge
More pronounced on first premolars

Front 29

Ridge running mesiodistally on cervical third of buccal surface of the crown. Found on all primary teeth and permanent molars

Back 29

Cervical ridge

Front 30

Located on the mesial and distal boarder of the lingual surface of incisors and canines

Back 30

Marginal ridge

Front 31

Located on mesial and distal boarder of the occlusal surface on post. teeth.

Back 31

Marginal ridge

Front 32

Ridge that projects from the cusp tip to the central groove. Found on post. teeth.

Back 32

Triangular ridge

Front 33

Formed by the union of the lingual triangular ridge of a buccal cusp and a buccal triangular ridge of a lingual cusp. Runs from the buccal surface to the lingual surface across occlusal surface of most post. teeth.

Back 33

Transverse ridge

Front 34

Any union of two triangular ridges produces a single ridge called what?

Back 34

Transverse ridge

Front 35

Descend from the cusps of molars and premolars toward the central part of the occlusal surface.

Back 35

Triangular ridges

Front 36

What consists of cusps, ridges, and grooves and is bound mesiodistally by the marginal ridges and buccolingually by the cusp ridges.

Back 36

Occlusal surface

Front 37

Cutting edge or biting surface of the tooth.

Back 37

Incisal edge

Front 38

Part of the tooth covered by enamel.

Back 38

Anatomic crown

Front 39

What separates the anatomical crown and root?

Back 39

CEJ

Front 40

The part of the tooth that is visible in the oral cavity. May be smaller or larger than the anatomic version.

Back 40

Clinical crown

Front 41

What separates the clinical crown and root?

Back 41

Gingival Margin

Front 42

True/False
The clinical crown and root are may be composed of both enamel and cementum

Back 42

True

Front 43

Which of the premolars is characterized by development from five lobes?

Back 43

Mand. second premolar

Front 44

An area of the tooth germ where the cells are particularly active.

Back 44

Growth center (lobe)

Front 45

Primary centers of calcification and are primarily sections of formation in the development of the crown of a tooth.

Back 45

Growth centers (lobe)

Front 46

What are the lobes represented by?

Back 46

Cusps on post. teeth and mamelons and cingula on ant. teeth

Front 47

What are the lobes separated by?

Back 47

Developmental grooves

Front 48

What is unique about lobes of the ant. teeth?

Back 48

Less noticable and separated by developmental depressions

Front 49

How many lobes in ant. teeth?

Back 49

3 labial
1 lingual

Front 50

How many lobes in the premolars?

Back 50

3 buccal
1 Lingual
Except Mand. 2nd (3 buccal, 2 lingual)

Front 51

How many lobes does the first molars have?

Back 51

5 lobes = 5 cusps

Front 52

How many lobes do second molars have?

Back 52

4 lobes = 4 cusps

Front 53

How many lobes do third molars have?

Back 53

At least four = 1 per lobe
Variations

Front 54

What is the minimum number of lobes from which any tooth may develop?

Back 54

4

Front 55

What is an extra formation of enamel called?

Back 55

Tubercle

Front 56

What is the most common tubercle?

Back 56

Cusp of Carabelli

Front 57

Where is the cusp of carabelli located?

Back 57

lingual surface of the mesiolingual cusp of max. first molar

Front 58

True/False
It is not possible to have a tubcle similar to the cusp of carabelli on the second max. molar?

Back 58

False
It can have a tubercle that is similar to the cusp of carabelli

Front 59

An extra cusp, usually in the central groove or ridge of a posterior tooth and the cingulum area of the central and lateral incisors

Back 59

Dens evaginatus

Front 60

What is special about dens evaginatus in the ant. teeth?

Back 60

Talon shaped approaching the level of the incisal edge. Contains enamel, dentin and pulp tissue

Front 61

An elevation or mound of enamel (larger than a tubercle) found on the occlusal surface of molar and premolar teeth and on the incisal edge of canines.

Back 61

Cusp

Front 62

A bulbous elevation of enamel (larger than a tubercle) that constitues the lingual lobe of an anterior tooth. Found on the cervical third of the lingual surface

Back 62

Cingulum

Front 63

The number of point angles a tooth has is ...

Back 63

4

Front 64

Angle formed by the junction of three surfaces

Back 64

Point angle

Front 65

Angle formed by the junction of two surfaces

Back 65

Line Angle

Front 66

How many line angles are there in the posterior teeth?

Back 66

8

Front 67

How many line angles are there in ant. teeth?

Back 67

6
Mesioincisal and distoincisal line angels are considered non-existent

Front 68

Any linear elevation of the tooth is called what?

Back 68

Ridge

Front 69

What are the two ridges found on all teeth?

Back 69

Mesial and distal marginal ridges

Front 70

The marginal ridges are more prominent on the lingual surfaces of Max. Lateral/Central incisors?

Back 70

Max. Lateral incisors

Front 71

Allow chewed food to escape from the occlusal surface. Also mark hygienic factors of the mouth more effective by exposing tooth surfaces to oral fluids and mechanical cleansing of the tongue, lip, and cheeks

Back 71

Embrasures

Front 72

Where are the most pronounced developmental grooves usually associated?

Back 72

Embrasures between
Max. canines and first premolars
Mand. canines and first premolars

Front 73

What is the largest incisal/occlusal embrasure?

Back 73

Between Max. Canine and first premolar