Developmental Abnormalities of Teeth Flashcards

1
Q

Opacities – ______ thickness

A

normal thickness

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2
Q

Hypoplasia – ______ thickness

A

reduced

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3
Q

Bilaterally symmetric, horizontal zones of

hypoplasia

A

Febrile illness

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4
Q

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

A

Turner’s tooth

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5
Q
Excessive fluoride during enamel 
development produces hypomineralized, 
white chalky areas
The enamel matrix protein amelogenin is 
retained 
Increased caries resistance
A

Dental fluorsis

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6
Q

Hutchinson’s incisors

Mulberry molars

A

Congenital syphyllis

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7
Q

_____ root resorption - begins in dental pulp

A

Internal

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8
Q

_____ root resorption- begins in periodontal ligament

A

External

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9
Q

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

A

Pink tooth of mumery

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10
Q

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

A

ERR

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11
Q
A type of external resorption that may 
resemble internal resorption
Begins in cervical PDL area and extends 
into tooth
Often occurs rapidly
A

Invasive Cervical Resoprtion

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12
Q

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

A

Impaction

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13
Q

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

A

Ankylosis

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14
Q

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

A

Natal

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14
Q

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

A

Natal teeth

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15
Q

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

A

Ectodermal Dysplasia

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16
Q

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

A

 Third molars
 Second premolars
 Maxillary lateral incisors

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17
Q

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

A

Maxillary central incisors

First molars

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18
Q

What 3 locations are most common for supernumeraries?

A

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

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19
Q
Autosomal dominant, many cases are new 
mutations
Intestinal polyposis with 100% malignant 
transformation
Osteomas and jaw bone densities
Supernumerary teeth
A

Gardner syndrome

20
Q
Generalized - rare
 Pituitary giantism
 Hemifacial hyperplasia
Localized – also rare
 Mandibular third molars
A

Macrodontia

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

Microdontia

22
Q

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

A

Gemination

23
Q

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

A

Fusion

24
Q

2 teeth that are joined together via cementum

A

Concrescence

25
Q

Deep surface invagination lined by enamel

A

Dens-In-Dente

Dens invaginatus

26
Q

Ectopic deposition of enamel usually found near furcations

A

Enamel pearl

27
Q

What is a cause of generalized hypercementosis?

A

Paget’s disease of bone

28
Q

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

A

Dilaceration

29
Q

What 3 teeth are most commonly possessing supernumerary roots?

A
Permanent molars 
- third molars
Mandibular 
cuspids
Mandibular 
premolars
30
Q

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

A

Amelogenesis

31
Q

 Inadequate deposition

A

Hypoplastic

32
Q

 No significant mineralization

A

Hypocalcified

33
Q

 Normal enamel matrix, defect in maturation

A

Hypomaturation

34
Q

Taurodontism can be seen in accordance with _____

A

AI

35
Q
Autosomal 
dominant
Defective 
formation of 
dentin 
May be associated 
with osteogenesis
imperfecta
-Opalescent teeth
- Abnormally soft dentin
A

DI

36
Q
Opalescent teeth
Abnormally soft dentin
Cervical constriction, producing bulbous 
appearing crowns with thin roots
Obliteration of the pulp spaces
A

Dentinogenesis imperfecta

37
Q

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

A

normal

38
Q
T/F: In DI, In the remainder of 
the dentin, the 
tubules are 
disoriented, irregular 
and widely-spaced
A

True

39
Q

What type of DI is seen with Osteogenesis imperfecta?

A

DI Type 1

40
Q

What type of DI is seen with Hereditary opalescent dentin?

-No hereditary component

A

Type 2 DI

41
Q

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

A

Type 3 DI

42
Q

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

A

Osteogenesis Imperfecta

43
Q

Type ___ dentin dysplasia is radicular

A

Type 1 Dentin dysplasia

44
Q

Type ___ dentin dysplasia is coronal

A

Type 2 dentin dysplasia

45
Q

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

A

Dentin dysplasia Type 1 Radicular

46
Q
Autosomal 
dominant
Normal root 
length
“Thistle-tube”
pulp chambers
Pulp stones in 
most teeth
A

Dentin dysplasia type 2 (coronal)

47
Q

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

A

Regional odontoplasia

48
Q

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

A

Segmental Odontomaxillary Dysplasia