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Oral Radiology and Pathology Midterm I > Lecture 6 - Developmental Abnormalities > Flashcards

Lecture 6 - Developmental Abnormalities Flashcards

1
Q

Impacted

A

Will not erupt

Usually blocked by bone

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2
Q

Unerupted

A

Hasn’t erupted

Not blocked

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3
Q

Transposition

A

Tooth position switch with another
Not common
Max. canine/bicuspid is most commmon

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4
Q

Supernumerary teeth

A

Extra teeth
Result of excess dental lamina
More common in permanent dentition than primary
Can cause: misalignment, root resorption, dentigerous cysts
1-4% of population
> Asians, Native Americans
2:1 Male

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5
Q

Supplemental tooth

A

Supernumerary tooth that is morphologically normal

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6
Q

Mesiodens

A

Supernumerary tooth b/t maxillary central incisors
Most common supernumerary tooth
Usually palatal

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7
Q

Peridens

A

Supernumerary tooth in premolar area

Mandibular peridens is second most common supernumerary

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8
Q

Distodens

A

Supernumerary tooth in molar area

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9
Q

Ddx associated with Supernumerary tooth

A 
Cleidocranial dysplasia
Pykodysostosis
Gardner’s syndrome
• Osteoma’s
• Supernumeraries
• Impacted teeth
• Colon polyps/cancer
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10
Q

Common missing teeth

A

Third molars most common

Lateral and mandibular second bicuspid second most common

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11
Q

Ddx associated with missing teeth

A

Ectodermal dysplasia

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12
Q

Microdont/Peg lateral

A

Small tooth
Generally only in maxilla
Fully-formed/normal anatomy

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13
Q

Megadont/Macrodont

A

Big tooth

Fully-formed/normal anatomy

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14
Q

Fusion

A

Missing tooth fused w/ existing tooth
Complete or incompletely fused roots and/or crowns
Pt will have one less tooth

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15
Q

Gemination

A

Two teeth develop from one tooth bud
Will not be missing a tooth
Partial or complete division through crown and root

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16
Q

Concrescence

A

Teeth joined by excess cementum
Max. 3rd molars
Rare

17
Q

Taurodont

A

Huge pulp chambers
Body of tooth and pulp chamber enlarged vertically at the expense of the roots
Caused by failure or late invagination of Hertwig’s epithelial root sheath

18
Q

Dilaceration

A

Abnormal angulation or sharp bend of the root or tooth
Due to trauma when tooth is forming
Most often max. premolars

19
Q

Tooth within a tooth

A

Dens invaginatis < dens in dente < dilated odontome (most “severe”)
Max. lateral incisor is most common

20
Q

Dens evaginatus/Leong’s premolar

A

Extra cusp
Pulp of tooth may extend too
Mand. premolar is most common
May need root canal if breaks off

21
Q

Enamel pearl

A

Pearl of enamel where it shouldn’t be
Most common on max. molars
Usually in furcation of molars from Hertwig’s epithelial root sheath

22
Q

Enamel hypoplasia

A

Tooth enamel is hard, but thin and not enough

23
Q

Amelogenesis imperfecta

A

Abnormal formation of enamel
Malfunction of ameloblastin, enamelin, tuftelin, and amelogenin
Teeth abnormally yellow, brown, or grey
Caries and hypersensitivity

24
Q

Dentin dysplasia Type 1

A 
Radicular
Absence of pulp chamber
Normal clinical crown morphology/color
Short, blunted roots
AD
25
Q

Dentin dysplasia Type 2

A

Coronal
Primary dentition similar to Type 2 DI
Permanent dentition has abnormal pulp morphology and pulp stones
AD

26
Q

Dentinogenesis imperfecta

A

Discolored teeth, blue-grey or yellow-brown
Opalescent
Enamel usually chips off

27
Q

DI Type 1

A

Associated with OI
Absence of pulp chamber/canals
Bell-shaped crown
Short, blunted roots

28
Q

DI Type 2

A

Hereditary opalescent dentin
Not associated w/ other disorders
Absence of pulp chamber/canals
Abnormal crown/root morphology

29
Q

DI Type 3

A 
Rarest form of DI
"Shell teeth"
Large pulp chambers, thin dentin, thin enamel
Bell shaped crown
Diminished root structure
30
Q

Hypophosphatasia

A

Can’t remineralize bone b/c of phosphatase deficiency in osteoblasts and chondrocytes
Clinical appearance like rickets:
Apical lesions without caries
- Aplasia, hypoplasia, or dysplasia of dental cementum
- Premature loss of deciduous teeth
- “shell teeth” = enlarged pulp chambers and root canals

31
Q

Hypercementosis

A 
Excessive buildup of normal cementum on roots
“PIG ON TAP”
- Paget’s disease
- Idiopathic
- Gigantism
- Occlusal trauma
- Non-functional Tooth trauma
- Acromegaly
- Periapical granuloma
32
Q

Pulp Stones

A

Calcified masses in pulp chamber
No clinical significance, makes endo harder
Ddx: calculus, enamel pearl

Oral Radiology and Pathology Midterm I (10 decks)

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