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Radiographic Interpretation > Dental Abnormalities > Flashcards

Dental Abnormalities Flashcards

1
Q

Hyperodontia

A

Teeth in excess of the normal
complement

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2
Q
  • Maxillary incisors -
A

mesiodens

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3
Q
  • Maxillary fourth molars
    (2)
A
  • distodens,
  • paramolars
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4
Q
  • Mandibular fourth molars
    (2)
A
  • distodens,
  • paramolars
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5
Q

Hyperdontia - multiple teeth
Most common in — area

A

premolar

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6
Q

Syndromes with multiple teeth
(2)

A
  • Cleidocranial Dysplasia
  • Gardner
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7
Q

Cleidocranial Dysplasia
(2)

A
  • Frontal & parietal bossing
  • Clavicular aplasia
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8
Q

Gardner Syndrome
(5)

A
  • Autosomal dominant
  • Multiple osteomas including the jaws
  • Colorectal polyps with malignant potential
  • Multiple supernumerary teeth
  • Lesions of skin (cutaneous epidermoid cysts
    and fibromas)
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9
Q

Problems with
Supernumeraries
(2)

A
  • Affect eruption of normal complement of
    teeth
  • Cystic degeneration of follicular
    epithelium
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10
Q

Hypodontia

A

less than the normal tooth
complement of an existing dentition;
permanent or deciduous
less than one or more of an existing
dentition; permanent or deciduous

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11
Q

Anodontia

A

congenital absence of all teeth

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12
Q
  • Anodontia –
A

agenesis of all teeth

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13
Q
  • Oligodontia –
A

congenital lack of > 6
permanent teeth, excluding third molars

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14
Q
  • Hypodontia –
A

less than one or more of
an existing dentition; permanent or
deciduous

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15
Q

TYPES
(3)

A
  1. Acquired
  2. Syndromal
  3. Reduction phenomenon
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16
Q
  1. Reduction phenomenon
    (4)
A
  • Third Molar Agenesis
  • Maxillary Lateral Incisors
  • Microdontia
  • Isolated Agenesis
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17
Q

Hypodontia
less than the normal tooth
complement of an existing dentition
Most common

A

Acquired

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18
Q

Syndromes with missing teeth
~— syndromes

A

150

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19
Q

Syndromes with missing teeth
(5)

A
  • ectodermal dysplasia
  • oligodontia-colorectal cancer syndrome
  • ectodermal dysplasia with oligodontia-
    colorectal cancer syndrome
  • otodental dysplasia – associated with
    deafness
  • Rieger Syndrome – associated with
    deafness
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20
Q
  • oligodontia-
A

colorectal cancer syndrome

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21
Q
  • ectodermal dysplasia with oligodontia-
A

colorectal cancer syndrome

22
Q
  • otodental dysplasia –
A

associated with
deafness

23
Q
  • Rieger Syndrome –
A

associated with
deafness

24
Q

Reduction Phenomenon
(3)

A
  • Hypodontia not associated with other
    multiple system congenital syndrome
  • Seen with third molars and maxillary
    lateral incisors
  • Evolutionary trend ?
25
Q

Third molar hypodontia
Woolf, 1971
* Incidence of 1 – 4 missing is;

A

10-25%

26
Q

Third molar hypodontia
Hellman 1936
* Incidence of 1 – 4 missing is…

A

29.6%

27
Q

1 missing …
2 missing…
3 missing…
4 missing…

A

8.9%
10.0%
4.4%
6.3%

28
Q

Agenesis of Maxillary Lateral Incisor
AMLI
(3)

A
  • Uni/bilateral reduction, i.e., peg lateral
    maxillary inmcosor
  • Uni/bilateral agenesis
  • a variable manifestation hypodontia
29
Q

Non-Third molar hypodontia
* Graber 1978 -
* Jorgenson 1980 –

A

1.6 –9.6% (median 5.6%)
6.0-7.0%

30
Q

skipped
Anomalies (other)

A
  • Macrodonts
  • Dilaceration
  • Supernumerary roots
  • Non-carious loss of tooth structure – erosion
  • Attrition
    -abrasion
  • Taurodont
  • Dens Invaginatus
  • Talon Cusp
  • Drift vs. Migration
  • Impacted Teeth
31
Q

Macrodont

A

Bulky Incisor or Double tooth
phenomenon

32
Q

Dilaceration
(3)

A
  • Abnormal angulation
    or bend in the root
    (and occasionally
    the crown) of a tooth
  • Some related to
    trauma during
    odontogenesis
  • idiopathic
33
Q

Supernumerary Roots

A
  • Extra roots above
    the complement
    of roots classically
    described for the
    dentition
34
Q

Supernumerary Roots
* Significant for

  • Appear to be
    excellent
A

endodontic or
exodontic
considerations

prosthodontic
abutments

35
Q

Li Root of Mandibular First
Molars
* —% incidence in
Asians in a Chinese
population (Hong
Kong and Taiwan)
* —% in native
North American
populations

A

20
10-12

36
Q

Attrition –

A

physiologic wear of teeth

37
Q

Abrasion –

A

mechanical wear of teeth

38
Q

Erosion –

A

chemical wear of teeth

39
Q

Taurodont
(2)

A
  • Idiopathic developmental
    disorder of odonogenesis
    causing elongation of the
    pulp chamber (aka apical
    displacement of the
    pulpal floor) and shorter
    root appendages
  • failure of Hertwig’s
    epithelial sheath
    diaphragm to invaginate
    at the proper horizontal
    level, resulting in a tooth
    with short root, enlarged
    body, an enlarged pulp
    and normal dentin
40
Q

Taurodont
* Treatment complications if

A

endodontic
treatment or extractions are needed

41
Q

Dens Invaginatus
Dens in Dente
* —% incidence
* Primarily seen in

A

0.04 – 10
lateral incisors but
also centrals,
premoalrs, centrals,
canines…..

42
Q

Dens Invaginatus
Dens in Dente
* Type I –
* Type II –
* Type III –

A

coronal
extends
apical to CEJ
extends
through root
perforating to apex

43
Q

Dens Invaginatus
Dens in DenteTreatment –

A

restore the coronal pit

44
Q

Drift

A

movement of erupted teeth

45
Q

Migration

A

movement of unerupted teeth

46
Q

Impacted Teeth -Descriptors
I. a. Full impaction –
II. b. Partial impaction - <

A

bony vs soft tissue
full eruption

47
Q

skipped
Orientation

A
  • Vertical
  • Inverted
  • Mesioangular
  • Distoangular
  • Horizontal
  • Inverted Mesioangular
  • Inverted Distoangular
48
Q

Needed to evaluate
(2)

A
  • prognosis
  • surgical management
49
Q

Problems with Supernumeraries and Impacted Teeth
(2)

A
  • Affect eruption of normal complement of
    teeth
  • Cystic degeneration of follicular
    epithelium
50
Q

enameloma

A

ectopic globule of enamel formation located on the root surface
aka enamel pearl

51
Q

dentinoma (2)

A

may result from proliferation of connective tissue and hertwigs epithelial root sheath cells
epithelial remnants induce undifferentiated connective tissue cells to transform into odontoblasts that produce dentin

Radiographic Interpretation (13 decks)

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