Primary Dentition

Question 1

How many primary teeth are in total?

How are they lettered or numbered?

Answer 1

20 (10 in each arch),
LETTERED

Question 2

Teeth start to form at _________ in utero

Answer 2

4-6 weeks in utero

Question 3

Calcification: begins approx ______________ in utero:

Answer 3

4-5 months in utero

Question 4

At Birth, are teeth visible? How about the tooth buds?

Answer 4

At Birth, no teeth are visible; however, tooth buds may be noted on radiographs*

Question 5

Date of eruption for max and mand central incisrors:

Answer 5

6-10 months

Question 6

Eruption:
Max later incisor

Answer 6

8-13 months

Question 7

Eruption:
mand lateral incisors

Answer 7

10-16 months

Question 8

max and mand first morlars (first year molars) erupption date

Answer 8

18-14 months

Question 9

maxillary canines eruption

Answer 9

16-22 months

Question 10

mandibular canine eruption

Answer 10

17-23 months

Question 11

max and mandibular second molars (second year molars)

Answer 11

23-33 months

Question 12

By Five (5) years of age, there is separation of teeth, usually the **anterior teeth **due to the:

Answer 12

growth of the Maxilla and to accommodate the larger Permanent teeth.

Question 13

By Six (6) years of age, the ________________ erupt, with this occurrence we see the beginning of the Mixed Dentition Stage, usually lasting until : ___________________

Answer 13

By Six (6) years of age, the Permanent First Molars erupt, with this occurrence we see the beginning of the Mixed Dentition Stage, usually lasting until Twelve (12) years of age.

Question 14

Permanent Anterior Teeth Erupt _______ to Primary Anterior Teeth

Answer 14

LINGUAL

Question 15

Permanent Posterior Teeth erupt_____________ are of Primary teeth.

Answer 15

Erupt apical (beneath), in the furcation

Question 16

Primary teeth (roots) resorb; their roots are completed approximately ________________ years after eruption, then they resorb.

Answer 16

1 - 2 years

Question 17

Do primary incisors have mamelons?
How about permanent incisors?

Answer 17

Primary Incisors have NO mamelons; Permanent Incisors DO!

Question 18

Do primary teeth have premolars?

Answer 18

no

Question 19

• Primary Molars are replaced by

Answer 19

the Permanent Premolar teeth.

Question 20

Primary teeth are (smaller/larger?) and (whiter/darker?) that permenant teeth?

Answer 20

Primary teeth are smaller and whiter (less calcified than permanent teeth)

Question 21

Are the crowns of primary teeth narrower or wider M-D compared to their crown lengths?

Answer 21

Crowns of Primary Teeth are WIDER M-D compared to their crown lengths.

Primary teeth crowns are more “squatty” (disproportionally shorter and thicker)

Question 22

Roots of Primary Molars are _____________________beyond the crown to accommodate the Permanent Premolar Teeth.

Answer 22

longer, slender, and flare

Question 23

Primary teeth have prominent _________ ridges or bulges on anterior teeth labially and lingually, producing a construction at the cervix of the tooth.

Answer 23

cervical ridges!!

Question 24

are primary molars narrow or wider at the cervix?

Answer 24

Primary Molars are narrow at the cervix (constricted at the cervix).

Question 25

Prominent ________________________ cervical ridges on the maxillary and mandibular first primary molars.

Answer 25

buccal cervical ridges

Question 26

Primary teeth have a (narrow/wider) occlusal table in part due to:

Answer 26

narrow occlusal table due to a flat slanted surface above the cervical bulge.

Question 27

Occlusion:
* ______________________ and the ______________________ contact only one tooth in the opposing arch.
* Relations change with growth, no ________________ occlusal relationships.
* Spaces or diastemas develop particularly in the ____________________ region.
* Primary teeth wear on the __________&__________ (the primary teeth are less well calcified than the
permanent teeth).
* The first permanent molar stabilizes the occlusion at _________________ of age.

Answer 27

Occlusion:
* **Mandibular centrals and the maxillary second primary molars **contact only one tooth in the opposing arch.
* Relations change with growth, no static occlusal relationships.
* Spaces or diastemas develop particularly in the anterior region.
* Primary teeth wear on the incisal and occlusal (the primary teeth are less well calcified than the
permanent teeth).
* The first permanent molar stabilizes the occlusion at six years of age.

Question 28

• Primary teeth may have **Primate spaces **(A & B as pictured above).

These spaces originally were to accommodate the ______________ or ________________

• maxillary:
• mandibular:

Answer 28

long canines or primates

Maxillary: Mesial to the Canine Mandibular:Distal to the Canine

Question 29

the difference between the combined mesiodistal widths of the deciduous cuspids and molars and their successors is called:

Answer 29

**Leeway Space

*Specifically, the size differential between the Primary Canine, Primary First Molar and Primary Second Molar, and the Permanent Canine, First Molar, and Second Molar. Usually, the sum of the Primary Tooth Widths is greater than that of their permanent successors. *

Question 30

which arch has more leeway space?

Answer 30

mandibular arch

Question 31

There is a greater mesiodistal width of the Mandibular Primary Molars by ________________, allowing more of a mesial shift of the permanent molars.

Answer 31

2.1mm

Question 32

Primary teeth characteristics image

Answer 32

Question 33

Diagram of Enamel Rods: primary vs permenant teeth

Answer 33

• Primary teeth: Slope Occlusally from DEJ
• Permanent Teeth: Slope Cervically from DEJ

Question 34

Primary Maxillary Central Incisor

• Greater ________________width than crown height
• ____________________ has thick appearance
• Single, Conical Root, ________________ Root Canal
• Pulp has _____________ horns

Answer 34

• Greater M-D width than crown height
• Proximal has thick appearance
• Single, Conical Root, One Root Canal
• Pulp has 2 or 3 pulp horns

Question 35

Primary Maxillary Lateral Incisor

• (Narrower/wider?) M-D width than central incisor
• which length is greater, Cervicoincisal or mesiodistal width?
• Distoincisal angle much more ____________ than central incisor
• Pulp cavity has cervical constriction with ____________root canal and _________ pulp horns (M & D)

Answer 35

• Narrower M-D width than central incisor
• Cervicoincisal length greater than mesiodistal width
• Distoincisal angle much more rounded than central incisor
• Pulp cavity has cervical constriction with 1 root canal and 2 pulp horns (M & D)

Question 36

Primary Maxillary Canine

• ____________________ in all aspects of the anterior teeth.
• Widest primary tooth ____________________ and wider M-D than _________________________
• More constriction at the ____________________surfaces are more (convex /concave?) than incisors
• Mesial and Distal contacts at the ________ level
• Longer ____________cusp slope
  * how mnay roots, root canal and pulp horns?

Answer 36

• Bulkier in all aspects of the anterior teeth.
• Widest primary tooth Labiolingually and wider M-D than** Primary Maxillary Central Incisor.**
• More constriction at the **cervical and mesial and distal surfaces **are more convex than incisors
• Mesial and Distal contacts at the same level
• Longer mesial cusp slope
  * Single root, single root canal, no pulp horns