Development and Eruption of the Primary and Permanent

Question 1

________; Anomalies of number occur during this phase
• Supernumerary teeth
• Congenital tooth absence

Answer 1

• Initiation:

Question 1

________; Anomalies of number occur during this phase
• Supernumerary teeth
• Congenital tooth absence

Answer 1

• Initiation:

Question 2

Are supernumerary teeth more common in males or females?

Answer 2

Males

Question 3

Syndromes with 
\_\_\_\_\_\_\_\_\_:
Apert Cleidocranial 
Dysplasia
Gardner 
syndrome
Crouzon's 
Disease
Down 
Syndrome
Hallerman-
Strief

Answer 3

supernumerary teeth

Question 4

Is hypodontia more common in primary or permanent teeth?

Answer 4

Permanent

Question 5

Conditions with _______:

```
Ectodermal Dysplasia
Crouzon’s
Achondroplasia
Chondroectodermal Dysplasia
Ellis-van Creveld
~~~

Answer 5

Hypodontia

Question 6

Conditions with \_\_\_\_\_\_\_:         
Ectodermal dysplasia
Chondroectodermal dysplasia
Hemifacial microsomia
Down syndrome
Crouzon's

Answer 6

Microdontia

Question 7

Conditions with:
• Hemifacial 
hypertrophy
• Crouzon's
• Otodental 
syndrome

Answer 7

Macrodontia

Question 8

\_\_\_\_\_\_\_\_\_:
incidence 0.5%, more 
in primary dentition
• Bifid crown with 
single root and pulp 
chamber
• Familial inheritance, 
may impede eruption 
of permanent tooth, 
dx by counting crowns

Answer 8

• Gemination –

Question 9

1-7.7% rare in African 
Americans, maxillary lateral 
most often, both dentitions, 
etiology is invagination of 
inner enamel epithelium, 
clinical significance is caries 
related

Answer 9

• Dens in dente (Invaginatus):

Question 10

• Incidence – 1-4%, caused by evagination of enamel
epithelium focal hyperplasia of pulp mesenchyme
• Significance – pulp tissue in cusp may complicate
restorations

Answer 10

Dents evaginatus – Talon Cusp

Question 11

Failure of proper invagination of 
Hertwig’s epithelial root sheath; 
incidence - .54-5.6%, higher in 
patients with hypophosphatemic 
rickets
Syndromes – Klinefelter, 
Trichodento-osseous, 
Orofacialdigital, Ectodermal 
dysplasia, Amelogenesis imperfecta 
Type IV, Down

Answer 11

Taurodontism

Question 12

• Usually due to trauma in
primary dentition
• Lamellar ichthyosis –
syndrome associated

Answer 12

Dilaceration

Question 13

• Inherited defect with multiple patterns such as X-linked, Autosomal dominant 
or recessive
• Incidence variable from 
1:14,000 to 1:4000
• 4 major types with 14 
subgroups
• Distinguished from other 
enamel defects because of inheritance and no syndrome or systemic 
disease

Answer 13

• Amelogenesis Imperfecta

Question 14

Heritable defect of predentin 
matrix;normal mantle dentin
Incidence 1:8000
Shields Type I – occurs with 
Osteogenesis Imperfecta
Shields Type  II – “opalescent dentin”, 
occurs alone, both dentitions affected
Shields Type III – most severe with 
several variants

Answer 14

Dentinogenesis

Question 15

Anomalies of __________:
• Dentin dysplasia – Shields type I and II
• Regional odontodysplasia – “ghost teeth”
• Other conditions associated with dentin abnormalities –
vit-D resistant Rickets, hypoparathyroidism, Albright’s,
Ehlers-Danlos, Epidermolysis Bullosa, Osteogenesis
imperfecta

Answer 15

Dentin

Apposition

Question 16

Anomalies of ________:
• Hypercementosis
• Hypophosphotasia:

Answer 16

Apposition -

Cementum

Question 17

_________– prevalence is 4-70%
from European studies
• Possible problem with ameloblast function after full
matrix completion
• May be associated with febrile illness, antibiotics,
nutritional deficiencies, preterm birth

Answer 17

• Hypomineralized first molars

Question 18

What is the pattern of eruption for primary teeth generally?

Answer 18

ABDCE

Question 19

• Mineralization begins at the ___ month of fetal

development

Answer 19

4th month (2nd trimester)

Question 20

• Epstein’s pearls –palatal
midline
• Self-limiting without
intervention

Answer 20

Inclusion cysts

Question 21

Buccal and lingual 
aspect of alveolus
Most likely ectopic 
mucous glands
No tx indicated

Answer 21

Bohn’s Nodules

Question 22

• Crest of the alveolus

* Remnants of dental lamina

Answer 22

Dental Lamina Cysts

Question 23

• Natal at birth/neonatal within 
first 30 days
• Most are actual primary tooth
• May be associated with 
syndrome
• May need to extract if 
aspiration risk or malformed

Answer 23

Natal/Neonatal

teeth

Question 24

• Traumatic ulceration
from feeding
• May need to treat
alleviate discomfort

Answer 24

Traumatic ulceration: Riga Fede disease

Question 25

• Bluish Swelling
• Asymptomatic
• Treatment is indicated 
when eating is impaired, 
or pain is present
• Cam be associated with 
primary or permanent 
teeth
• Take a radiograph to 
verify tooth position

Answer 25

Eruption Hematoma

Question 26

• Evaluate marginal ridges 
in the mouth and on the 
radiograph
• May need to intervene and 
remove the tooth
• Monitor with primary 1st
molars
• Be sure there is a successor

Answer 26

Ankylosed or submerged teeth

Question 27

Occurs when a tooth erupts outside of the typical path of eruption

Answer 27

Ectopic eruption

Question 28

• Somewhat 
controversial among 
practitioners
• Other professionals 
perform these 
procedures – ENT, 
Plastic surgeons, 
Pediatricians
• If low tethered frenum 
impacts nutrition and 
feeding and/or speech, 
surgical intervention 
may be needed

Answer 28

Frenectomy

Question 29

Eruption of the permanent ______ will usually close
the remaining spaces including a midline diastema
if less than approximately 1 mm.

Answer 29

canines