Developmental Abnormalities of Teeth

Question 1

Opacities – ______ thickness

Answer 1

normal thickness

Question 2

Hypoplasia – ______ thickness

Answer 2

reduced

Question 3

Bilaterally symmetric, horizontal zones of

hypoplasia

Answer 3

Febrile illness

Question 4

Inflammation
Trauma
Periapical pathosis of primary tooth affects
underlying permanent tooth
Trauma to primary tooth affects underlying
permanent tooth

Answer 4

Turner’s tooth

Question 5

Excessive fluoride during enamel 
development produces hypomineralized, 
white chalky areas
The enamel matrix protein amelogenin is 
retained 
Increased caries resistance

Answer 5

Dental fluorsis

Question 6

Hutchinson’s incisors

Mulberry molars

Answer 6

Congenital syphyllis

Question 7

_____ root resorption - begins in dental pulp

Answer 7

Internal

Question 8

_____ root resorption- begins in periodontal ligament

Answer 8

External

Question 9

Begins in pulp
Usually asymptomatic
Granulation tissue may cause pink tooth
(IRR)

Answer 9

Pink tooth of mumery

Question 10

Begins in periodontal ligament
Usually asymptomatic
Trauma, inflammation, cysts, neoplasms,
idiopathic

Answer 10

ERR

Question 11

A type of external resorption that may 
resemble internal resorption
Begins in cervical PDL area and extends 
into tooth
Often occurs rapidly

Answer 11

Invasive Cervical Resoprtion

Question 12

Eruption ceases before emergence
Soft tissue impaction – may communicate
with the oral environment
Bony impaction

Answer 12

Impaction

Question 13

Fusion with alveolar bone
Cessation of eruption after emergence
Retained primary teeth “submerged” teeth

Answer 13

Ankylosis

Question 14

Teeth present at birth, or in first 30 days of
life
Mandibular incisors most frequent
Prematurely-erupted deciduous teeth not
pre-deciduous supernumerary teeth
Retain, if stable; remove, if danger of
aspiration

Answer 14

Natal

Question 14

Teeth present at birth, or in first 30 days of
life
Mandibular incisors most frequent
Prematurely-erupted deciduous teeth not
pre-deciduous supernumerary teeth
Retain, if stable; remove, if danger of
aspiration

Answer 14

Natal teeth

Question 15

Many Syndromes
X-linked inheritance
Defective epidermal structures –
hypodontia, hypotrichosis, hypohidrosis

Answer 15

Ectodermal Dysplasia

Question 16

What are the 3 teeth that are most commonly missing in hypodontia?

Answer 16

 Third molars
 Second premolars
 Maxillary lateral incisors

Question 17

What are the 2 teeth that are least commonly missing in hypodontia?

Answer 17

Maxillary central incisors

First molars

Question 18

What 3 locations are most common for supernumeraries?

Answer 18

Anterior Maxilla – incisors
Posterior Maxilla – fourth molars
Mandibular premolars

Question 19

Autosomal dominant, many cases are new 
mutations
Intestinal polyposis with 100% malignant 
transformation
Osteomas and jaw bone densities
Supernumerary teeth

Answer 19

Gardner syndrome

Question 20

Generalized - rare
 Pituitary giantism
 Hemifacial hyperplasia
Localized – also rare
 Mandibular third molars

Answer 20

Macrodontia

Question 21

Generalized - rare
 Pituitary dwarfism
 Trisomy 21 (Down 
Syndrome)
Localized - common
 Maxillary lateral incisor
 Third molars

Answer 21

Microdontia

Question 22

Count the teeth
Affected tooth counts as one
Tooth count is normal
- 1 pulp chamber

Answer 22

Gemination

Question 23

Count teeth
Affected tooth counts as one
Tooth count reveals a missing tooth
- 2 pulp chambers

Answer 23

Fusion

Question 24

2 teeth that are joined together via cementum

Answer 24

Concrescence

Question 25

Deep surface invagination lined by enamel

Answer 25

Dens-In-Dente | Dens invaginatus

Question 26

Ectopic deposition of enamel usually found near furcations

Answer 26

Enamel pearl

Question 27

What is a cause of generalized hypercementosis?

Answer 27

Paget's disease of bone

Question 28

An angulation or bend in a tooth root caused by displacement of the tooth germ The remainder of the tooth forms at abnormal angle

Answer 28

Dilaceration

Question 29

What 3 teeth are most commonly possessing supernumerary roots?

Answer 29

``` Permanent molars - third molars Mandibular cuspids Mandibular premolars ```

Question 30

A group of hereditary diseases involving defective enamel formation  Fourteen subtypes based on the clinical phenotype and pedigree

Answer 30

Amelogenesis

Question 31

 Inadequate deposition

Answer 31

Hypoplastic

Question 32

 No significant mineralization

Answer 32

Hypocalcified

Question 33

 Normal enamel matrix, defect in maturation

Answer 33

Hypomaturation

Question 34

Taurodontism can be seen in accordance with _____

Answer 34

AI

Question 35

``` Autosomal dominant Defective formation of dentin May be associated with osteogenesis imperfecta -Opalescent teeth - Abnormally soft dentin ```

Answer 35

DI

Question 36

``` Opalescent teeth Abnormally soft dentin Cervical constriction, producing bulbous appearing crowns with thin roots Obliteration of the pulp spaces ```

Answer 36

Dentinogenesis imperfecta

Question 37

In DI, The dentin immediately adjacent to the enamel is _______

Answer 37

normal

Question 38

``` T/F: In DI, In the remainder of the dentin, the tubules are disoriented, irregular and widely-spaced ```

Answer 38

True

Question 39

What type of DI is seen with Osteogenesis imperfecta?

Answer 39

DI Type 1

Question 40

What type of DI is seen with Hereditary opalescent dentin? | -No hereditary component

Answer 40

Type 2 DI

Question 41

What type of DI is seen with shell teeth (brandywine)

Answer 41

Type 3 DI

Question 42

Dentinogenesis Imperfecta, Type I Bone fractures Blue Sclerae

Answer 42

Osteogenesis Imperfecta

Question 43

Type ___ dentin dysplasia is radicular

Answer 43

Type 1 Dentin dysplasia

Question 44

Type ___ dentin dysplasia is coronal

Answer 44

Type 2 dentin dysplasia

Question 45

Autosomal dominant Pulpal obliteration with chevron-shaped pulp chambers Short roots (rootless teeth) “w-shaped” Periapical radiolucencies without any obvious cause

Answer 45

Dentin dysplasia Type 1 Radicular

Question 46

``` Autosomal dominant Normal root length “Thistle-tube” pulp chambers Pulp stones in most teeth ```

Answer 46

Dentin dysplasia type 2 (coronal)

Question 47

A localized developmental abnormality that involves enamel, dentin and pulp Not hereditary – idiopathic, possibly due to an alteration in vascular supply May affect deciduous or permanent teeth, with a predominance in the anterior area -Usually affects several contiguous teeth in a region (Pathognomonic) Produces ghost teeth - pale, whispy images of teeth with extremely thin enamel and dentin surrounding large radiolucent pulp

Answer 47

Regional odontoplasia

Question 48

A recently recognized developmental disorder involving both the teeth and bone of posterior maxilla  Unilateral expansion of posterior maxillary alveolar process with gingival enlargement  Variable absence of one or both premolars and primary molar anomalies  Delayed eruption of adjacent teeth  Bone exhibits granular, radiopaque appearance

Answer 48

Segmental Odontomaxillary Dysplasia