Terminology in Tooth Morphology

Question 1

Name of sets of teeth and what that is called

Answer 1

Primary and permanent dentition

Diphyodont

Question 2

When do primary teeth begin to form?

Answer 2

prenatally about 14 weeks in utero

Question 3

What does the primary dentition consist of?

Answer 3

10 teeth in the maxilla and 10 teeth in the mandible

Question 4

Primary teeth: what is in each quadrant?

Answer 4

5 teeth: two incisors, one canine, and two molars

Question 5

Generally, when do the first primary teeth emerge in the oral cavity and which teeth are they?

Answer 5

at the mean age of 8 months (6-12 months)

they are usually mandibular central incisors

Question 6

What are the last primary teeth to emerge and when do they emerge?

Answer 6

maxillary second molars at the mean age of 28 +/- 4 months

Question 7

When do the first permanent teeth start to erupt?

What is usually the first?

What is another common first permanent tooth to erupt?

Answer 7

6 years

permanent mandibular first molars

permanent mandibular incisors

Question 8

Mixed dentition period

Answer 8

primary and permanent teeth

Question 9

When does permanent dentition period start (age)? And with what tooth replacement?

Answer 9

Approximately 12 years old

Begins when the second molars start to erupt and the primary molars are being replaced by the permanent premolars

Question 10

When is the eruption of the permanent dentition usually completed (inlcuding roots)? (except for the third molar)

Answer 10

14-15 years old

Question 11

When are the thirs molars usually completed?

Answer 11

18 to 25 years old

Question 12

What are the quadrants divided by?

Answer 12

Midsagittal line

Question 13

Zsigmondy/Palmer tooth numbering system for permanent teeth

Answer 13

Question 14

Zsigmondy/Palmer tooth numbering system for primary teeth

Answer 14

Question 15

A two digit system

Answer 15

Question 16

What do we use?

Answer 16

Question 17

Clinical crown

Answer 17

the part of the tooth that can be seen in the oral cavity

Question 18

Clinical root

Answer 18

the part of the tooth that is covered by the gingiva (gum)

Question 19

Anatomical crown

Answer 19

part of the crown that is covered with the enamel

Question 20

Anatomical root

Answer 20

part that is covered by cementum

Question 21

CEJ

Answer 21

cementoenamel junction

divides anatomical root from anatomical crown

Question 22

Tip of the root

Answer 22

Apex of root

Question 23

Apical foramen

Answer 23

the opening at the root apex where the pulp enters/exits

Question 24

Tooth tissues

Answer 24

• Enamel
• Dentin
• Cementum-covers root
• Pulp
  
  • First three are hard tissues, the pulp is soft tissue
  • the primary fxn of the pulp is to form the dentin of the tooth
  • As we age, pulp becomes smaller

Question 25

Identify CEJ, DEJ, periodontal ligament, bone, bony septum, gingiva

Answer 25

Question 26

Pulp horn

Answer 26

The projections in the roof of the
pulp chamber correspond to the
major cusps or lobes

Question 27

Pulp chamber

Answer 27

The crown portion of a tooth that
contains the pulp tissues

Question 28

Root canal

Answer 28

The root portion of the
tooth that contains the pulp
tissue

Question 29

Supplemental canal

Answer 29

Question 30

Furcation

Answer 30

The area of the multi-rooted tooth where the root divides.

Question 31

Root trunk

Answer 31

the area
of the root between
the CEJ and the
furcation.

Question 32

Alveolar process

Answer 32

The alveolar process
is the portion of the jaw
serving as support for
the tooth

Question 33

Alveolus

Answer 33

The bone of the tooth
socket is called the
alveolus (plural: alveoli).

Question 34

Proximal

Answer 34

towards the adjacent teeth

Question 35

mesial

Answer 35

towards the midline

Question 36

distal

Answer 36

away from the midline

Question 37

facial

Answer 37

towards the face

Question 38

labial

Answer 38

towards the lip (anterior teeth)

Question 39

buccal

Answer 39

towards the cheek (posterior teeth)

Question 40

lingual

Answer 40

towards the tongue

Question 41

palatal

Answer 41

towards the palate

Question 42

occlusal

Answer 42

the chewing surface/ the surface that
comes in contact with the opposing tooth (posterior)

Question 43

incisal

Answer 43

the cutting surface (anterior)

Question 44

radicular

Answer 44

of, relating to, or occurring at the root of
a tooth

Question 45

coronal

Answer 45

of, relating to, or occurring at the crown of
a tooth

Question 46

Height of contour

Answer 46

is a concept used in aspects of restorative
dentistry and means the most prominent part of a tooth

Question 47

Measuring with Boley Gauge

Answer 47

2.7mm

Question 48

Dividing teeth into thirds

Answer 48

Question 49

Lobe

Answer 49

A lobe is one of the primary sections of formation in the development of the crown. Cusps, cingulum and mamelons are representative of lobes.

Question 50

Tubercle

Answer 50

A tubercle is an elevation on the crown produced by an extra formation of enamel. We usually use this term when there is a deviation from the typical form.

Question 51

Line angles

Answer 51

• formed by the junction of 2 surfaces
• name is 2 descriptive surfaces

Question 52

Point angles

Answer 52

are formed when three surfaces join

name using 3 descriptive surfaces

Question 53

Embrasures

Answer 53

• spillways that are found between the two adjacent teeth.
• The examples of embrasures are facial, lingual, occlusal/ incisal embrasures and cervical/gingival embrasures.
• All embrasures are “empty” triangular spaces surrounding the proximal contact, except the cervical or gingival embrasure.
• The cervical or gingival embrasure contains part of the gingiva that is called the Interdental papilla (IDP).
• The embrasures serve 2 purposes;
  
  • 1. Provide a spillway for food
  • 2. Prevent food form being forced into the contact areas.