Terms Of Orientation

Question 1

Portion of the tooth that is covered with enamel and projects from the tissues in which the root is fixed

Answer 1

Crown

Question 2

Difference between anatomical and clinical crown

Answer 2

Anatomical: part of the tooth covered by enamel
Clinical: part of the crown of a tooth that is visible in the oral cavity; varies with level of gingival margin around tooth

Question 3

Portion of a tooth that is embedded in the alveolus and covered by cementum

Answer 3

Root

Question 4

Difference between the anatomical and clinical root

Answer 4

Anatomical: part of tooth that is covered with cementum
Clinical: part of the tooth that is not visible in the mouth

Question 5

Unworn surface formed by the junction of the labial and lingual surfaces of anterior teeth

Answer 5

Incisal ridge

Question 6

Surface formed on the incisal ridge after wear has taken place

Answer 6

Incisal surface

Question 7

Edge formed by junction of axial surfaces and incisal surfaces of anterior teeth

Answer 7

Incisal edge
Labia-
Lingo-
Mesio-
Disto-

Question 8

Surface of teeth facing towards adjoining teeth in the same dental arch

Answer 8

Proximal

Question 9

Pertaining to the neck

Answer 9

Cervical

Question 10

Touching of two surfaces of adjacent teeth

Answer 10

Proximal contact

Question 11

Point on the proximal surface of a tooth, which touches an adjacent tooth

Answer 11

Contact point

Question 12

Area of contact caused by the proximal attrition of one tooth with that of another in the same dental arch

Answer 12

Contact area

Question 13

Imaginary line/angle formed by the junction of two crown surfaces

Answer 13

Line angle

Question 14

Point which is the junction of three crown surfaces

Answer 14

Point angle

Question 15

Root termination/tip

Answer 15

Apex

Question 16

How many roots do anterior teeth have?

Answer 16

One

Question 17

Two roots

Answer 17

Bifurcation

Question 18

Three roots

Answer 18

Trifurcation

Question 19

Small rounded projection found on the crowns of teeth
Extra formation of enamel
Not normal/typical

Answer 19

Tubercle

Question 20

Where is the most likely location to find a tubercle?

Answer 20

Lingual surface of maxillary anterior teeth

Question 21

Lingual prominence of enamel on anterior teeth, rising incisally from the cervical line in varying proportions

Answer 21

Cingulum

Question 22

One of the three rounded prominences on the incisal ridge of a newly erupted unworn incisor

Answer 22

Mamelon

Question 23

Pronounced point/elevation on/near masticating surface of the crown of a tooth

Answer 23

Cusp

Question 24

Ridge/elevation of enamel on the mesial and distal margin of the occlusal surfaces of premolars and molars, and the lingual surfaces on incisors and canines

Answer 24

Marginal ridge

Question 25

Ridge running from the point of a cusp toward the central portion of the occlusal surface of a posterior tooth Named after the cusp to which they belong

Answer 25

Triangular ridge

Question 26

Ridge formed by two triangular ridges, which join to form a continuous elevation of enamel across the occlusal surface of some posterior teeth

Answer 26

Transverse ridge

Question 27

Ridge running obliquely across the occlusal surface of the maxillary molars Formed by the union of the triangular ridge of the disto-buccal cusp with the distal cusp ridge of the mesio-lingual cusp

Answer 27

Oblique ridge

Question 28

Elevation of enamel running from the point of a cusp toward the proximal surface

Answer 28

Cusp ridge

Question 29

Any prominent ridge of enamel immediately adjacent to the cervical line

Answer 29

Cervical ridge

Question 30

Elevation of enamel on the axial surfaces of a tooth running from the point of a cusp or the incisal edge toward the cervical line Usually applied to facial or lingual surfaces

Answer 30

Developmental ridge

Question 31

Round or angular depression occurring mostly on the lingual surfaces of the anterior teeth and on the occlusal surfaces of premolars and molars

Answer 31

Fossa

Question 32

V-shaped channel or depression on the occlusal surface of a tooth formed by the inclines of adjacent cusps or ridges which meet at an angle cervically

Answer 32

Sulcus

Question 33

Groove on a tooth formed during the appositional growth of enamel, dentin, and cementum Denotes the coalescence of the primary parts, of lobes of the crown of a tooth

Answer 33

Developmental groove (primary)

Question 34

An auxiliary groove, which branches from the developmental groove Location not related to the junction of primary tooth parts

Answer 34

Supplemental groove (secondary)

Question 35

Cleft/crevice in a tooth surface thought to result from the imperfect fusion of the enamel of adjoining cusps/lobes

Answer 35

Fissure

Question 36

Sharp pointed depression at the base of a fossa in the enamel of a tooth Usually occurs at the junction of two or more developmental grooves and at the end of grooves on the axial surfaces

Answer 36

Pit

Question 37

Plane that extends antero-posteriorly and medio-laterally | Perpendicular to the capital and coronal planes

Answer 37

Horizontal plane

Question 38

Vertical plane that extends medio-laterally and superio-inferiorly Parallel to coronal suture of skill Perpendicular to horizontal and sagittal planes

Answer 38

Coronal plane

Question 39

Vertical plane extending antero-posteriorly and superio-inferiorly Parallel to sagittal suture of skull Perpendicular to horizontal and coronal planes

Answer 39

Sagittal plane

Question 40

Most anterior line of mid-sagittal plane

Answer 40

Median line | Midline

Question 41

How are line angles named?

Answer 41

Names of two adjoining crown surfaces Proximal named first (mesial, distal) Occlusal/incisal always last

Question 42

How are point angles named?

Answer 42

Takes name of the three crown surfaces Proximal first - mesial/distal Axial second - buccal/labial/facial/lingual Occlusal or incisal last

Question 43

What helps define the embrasure?

Answer 43

Line and point angles

Question 44

How many roots to anterior teeth normally have?

Answer 44

One

Question 45

How many roots do posterior teeth mostly have?

Answer 45

Multiple - 2 or 3

Question 46

Most likely location for tubercles?

Answer 46

Lingual surface of maxillary anterior teeth

Question 47

Which teeth have a cingulum?

Answer 47

Anterior teeth

Question 48

Which teeth have cusps? How many?

Answer 48

Incisors - 0 Premolars - 2-3 Molars - 4 or more

Question 49

Which teeth have marginal ridges?

Answer 49

All

Question 50

Which teeth have transverse ridges?

Answer 50

Some posterior teeth

Question 51

Which teeth have oblique ridges?

Answer 51

Maxillary molars

Question 52

Which teeth have cusp ridges?

Answer 52

Only those teeth with cusps | Canines, premolars, molars

Question 53

Which teeth have a fossa?

Answer 53

All

Question 54

Which teeth have a lingual fossa?

Answer 54

Anterior teeth

Question 55

Which teeth have triangular fossa?

Answer 55

Premolars and molars

Question 56

Which teeth have a central fossa?

Answer 56

Molars

Question 57

Which teeth have a sulcus?

Answer 57

Premolars and molars