Deciduous Teeth

Question 1

Active Eruption

Answer 1

Vertical movement of teeth

Question 2

Passive Eruption

Answer 2

Gingiva recedes, no actual vertical movement takes place as we age

Question 3

Is eruption of primary and permanent teeth into the oral cavity active eruption or passive eruption

Answer 3

ACTIVE

Question 4

Primary teeth are lighter or darker opacity of enamel???

Answer 4

lighter

Question 5

Pulp chambers of primary teeth are large or small compared to permanent teeth

Answer 5

large

Question 6

Pulp horns of primary teeth are closer or farther from the occlusal plan

Answer 6

closer

Question 7

Dentin is thinner or thicker in primary teeth

Answer 7

thinner

Question 8

Explain exfoliation, resorption and eruption

Answer 8

Exfoliation: shedding or eliminating
something from the surface of the body,
as in loss of teeth from jaw bone • Primary roots are resorbed • Permanent teeth move vertically as part of
active eruption, and the primary tooth
loosens • Sometimes, the primary teeth do not
loosen and extraction is required

Question 9

removal of
hard tissues
such as
bone,
enamel,
dentin or
cementum

Answer 9

Resorption

Question 10

replace resorbed portions of root

Answer 10

cementoblasts

odontoblast

Question 11

removal of the primary’s root
(dentin, cementum, and small portions of the
enamel crown)

Answer 11

odontoclasts

Question 12

absorb alveolar bone between the

primary and permanent teeth

Answer 12

osteoclasts

Question 13

Shedding and eruption is ____ with
osteoclasts and osteoblasts working to repair
bone as it resorbs

Answer 13

intermittent

Question 14

**Which of the following breaks down
the bone between the primary tooth
and the permanent tooth following it?

Answer 14

osteoclasts

Question 15

General characteristics of molars

Answer 15

-Second molars resemble permanent first

molars from same arch

Question 16

Maxillary Central Incisors

Answer 16

- Wider mesiodistally than
incisocervically
• Mesial and distal outlines
very rounded due to
cervical constriction
• Usually no developmental
depressions or imbrication
lines
• Large cingulum and well
developed marginal ridges

Question 17

Does the mandibular central incisor or maxillary central incisor have a centered cingulum and shallow fossa

Answer 17

mandibular central incisor

Question 18

-Wider than permanent 
• Very symmetrical 
• Prominent, centered
cingulum and shallow fossa
 • Single root with slight
concavity on mesial and
distal aspects 
• Mamelons may be present

Answer 18

Mandibular Central Incisors

Question 19

• Longer incisocervically
than mesiodistally
(opposite the central) 
• Incisal angles are very
bulbous 
• Root is longer in
comparison to crown
length and sharper
apex

Answer 19

Max Lateral Incisors

Question 20

how can you tell apart a primary central or lateral for maxillary

Answer 20

Incisal angles are very bulbous on the lateral incisors

Question 21

• Crown is very similar to
mandibular central, but
wider and longer 
• Cingulum is more
developed and offset to
distal 
• Incisal edge slopes distal • Distal Twist!!!!!
 • Distoincisal edge is more
rounded 
• Root may have a distal
curve at apical 1/3
 • Fossa is deeper

Answer 21

Mandibular lateral incisors

Question 22

How do you tell apart a mandibular vs maxillary lateral incisors primary

Answer 22

Mandibular lateral will have a cingulum more developed and offset to distal

• incisal edge slopes distal
• distal twist

Question 23

Maxillary Canines

Answer 23

• Mesial cusp slope is longer than distal-opposite #6 &
#11
• Cingulum, marginal ridges and lingual ridges are well
developed
• Lingual ridge runs from cusp tip to cingulum • Tubercle may be present (accessory cusp)
• Cusp tip is offset to the distal from incisal view
• Root is about twice as long as crown

Question 24

Mandibular Canines

Answer 24

• Labial surface is much flatter
than maxillary with very
shallow grooves 
• Distal cusp slope is much
longer 
• Less lingual anatomy with very
shallow fossa 
• Incisal view shows a tapering
to lingual 
• Root is long, narrow and
almost twice the length of
crown

Question 25

How could you tell apart a mandibular canine from a maxillary canine primary

Answer 25

mandibular canine will have a distal cusp slope much longer

Question 26

• Typically 4 cusps, but may
be missing distolingual (3)
 • Same root configuration as
permanent, but more flare
and thinner 
• Prominent transverse ridge

Answer 26

Maxillary First Molars

Question 27

***• Closely resembles the
permanent maxillary first
molar 
***• May have a tubercle of
Carabelli located on the
mesiolingual cusp 
• Crown and roots larger
than primary first
maxillary molar 
• Buccal cusps very similar in
size

Answer 27

Maxillary Second Molars

Question 28

• Prominent
mesiobuccal
cervical ridge

Belt tumor hanging over belt
- 4 cusps with mesial larger

Answer 28

Mandibular first molars

Question 29

• Closely resembles the
permanent mandibular
first molar because
it has 5 cusps

Answer 29

Mandibular Second Molars