tooth morphology

Question 1

how many teeth are in the Primary Dentition

Answer 1

20 teeth, 5 in each quadrant

Question 2

how many teeth are in the secondary dentition

Answer 2

32 teeth, 8 in each quadrant

Question 3

cusp

Answer 3

The pointed or rounded part of a tooth’s biting surface.

Question 4

Marginal ridges

Answer 4

A linear, rounded border of enamel that
forms the mesial and distal margins of
anterior teeth.
• Mesial and distal borders of occlusal
surfaces on posterior teeth.

Question 5

cingulum

Answer 5

• A “U”- or “W” -shaped ridge at the base
of the palatal surface of the crown of the
upper incisors and canine teeth

Question 6

pit

Answer 6

a small indentation in the crown of the

tooth

Question 7

fissures

Answer 7

A deep furrow, cleft, or groove.
• A normal groove or furrow on the
surface of a tooth, that may divide it into
different parts.
• A developmental break or fault in the
enamel of a tooth

Question 8

groove

Answer 8

• any furrow or channel on a bodily

structure or part

Question 9

cervical margin

Answer 9

The slightly constricted part of a tooth,
between the crown and the root.
• The point at which enamel meets
cementum.

Question 10

What “tip” will help you identify

left from right?

Answer 10

Mesio incisal angle is
sharp
• Disto incisal angle is
rounded (upper left)

Question 11

Smallest tooth in the primary dentition

Answer 11

lower central primary incisors

Question 12

Upper surface called…

Lower surface called…

Answer 12

palatal

lingual

Question 13

Upper first primary molar

Answer 13

Three roots-two buccal and one palatal

Pronounced bulge on mesial side of buccal surface-molar tubercle of Zuckerkandl

Question 14

lower first primary molar

Answer 14

Molar tubercle of Zuckerkandl present on buccal
surface over the mesial root
• Four cusps- buccal cusps compressed
labiolingually with no clear separation between
them
• Mesiobuccal cusp largest
• Tooth is longer mesiodistally than labiolingually
• Two roots flattened mesiodistally

Question 15

lower second

primary molar

Answer 15

• Occlusal outline rectangular
• Five cusps-3 buccal 2 lingual
• Buccal cusps approx. equal in size
• Two divergent roots

Question 16

upper central secondary

incisors (5)

Answer 16

• Single root
• Shape of crown
• Large palatal cingulum
• Cingulum pit
• Marginal ridges on concave palatal surface

Question 17

upper lateral secondary incisors

Answer 17

• Similar to central incisor but crown is smaller
• Single root
• Incisal edge
• small palatal cingulum
• More concave than central incisor
• A pit may be present-foramen caecum incisivum
• Marginal ridges

Question 18

lower central secondary incisors

Answer 18

Smallest tooth in the secondary dentition
• Smooth featureless lingual surface
• Cingulum less developed - marginal ridge less prominent
• The root surface has a distinct groove along the length

Question 19

upper secondary canine?

Answer 19

Single root - longest rooted tooth

• Conical crown with pronounced cervical
bulge and pointed cusp
• Distal slope longer than mesial slope
• Cingulum on palatal surface

Question 20

upper first premolar

Answer 20

Two roots
• Two cusps
• Canine fossa on the mesial surface
• Fissure shape on the occlusal surface

Question 21

lower premolar

Answer 21

One root

• Occlusal surface- two cusps, two fossae

Question 22

secondary molar?

Answer 22

Three roots
• Occlusal surface- four
cusps
• Cusp of Carabelli