Dental Anomalies 2

Question 1

What is amelogenesis imperfecta?

Answer 1

• Inherited genetic mutation. Isolated or syndromic
• Enamel is affected in all or nearly all teeth

Question 2

Which dentititon is affected by amelogenesis imperfecta?

Answer 2

• Affects primary and permanent dentition.

Question 3

What is type I amelogenesis imperfecta?

Answer 3

Hypoplastic type: Thinner but hard enamel.

Question 4

What is type II amelogenesis imperfecta?

Answer 4

Hypomaturation type: Relatively hard but colored (not translucent)

Question 5

What is type III amelogenesis imperfecta?

Answer 5

Hypomineralized or hypocalcified: Softer rough colored undermineralized enamel

Question 6

What is type IV amelogenesis imperfecta?

Answer 6

Hypoplastic – hypomature with Taurodontism

not as common as other types

Question 7

What are the characteristics of type I amelogenesis imperfecta?

Answer 7

• Quantitative enamel defect: Failure during enamel matrix secretory stage
• Generalized or localized, pits, striae, groove defects.
• Diffuse smooth, or rough.
• Teeth appear white to yellow-brown, small, and square shaped.
• Open contacts. “picket fence” appearance. Flat occlusal surface, low cusps
• Delayed eruption and increased impaction

Question 8

What type of amelogenesis imperfecta does this show?

Answer 8

type I: hypoplastic type

Question 9

How do the teeth appear in type I amelogenesis imperfecta?

Answer 9

• Teeth appear white to yellow-brown, small, and square shaped.
• Open contacts. “picket fence” appearance. Flat occlusal surface, low cusps

Question 10

What type of enamel defect is present for type I amelogenesis imperfecta?

Answer 10

quantitative

Question 11

What type of amelogenesis imperfecta does this show?

Answer 11

type I: hypoplastic type

Question 12

What does this show?

Answer 12

amelogenesis imperfecta type I: hypoplastic type

Question 13

What are the characteristics of type II amelogenesis imperfecta (hypomaturation)?

Answer 13

• Normal thickness of enamel. It is a
  qualitative defect.
• Soft enamel (as radiodense as dentin)
• Less translucid enamel: Cloudy white, yellow or brown color.
• hard and protective

Question 14

What type of enamel defect is present for type II amelogenesis imperfecta?

Answer 14

qualitative

Question 15

What type of amelogenesis imperfecta does this show?

Answer 15

type II: hypomaturation

Question 16

What does amelogenesis imperfecta type II: hypomaturation look like on a radiograph?

Answer 16

the enamel is the same density as the dentin (cannot easily tell them apart)

Question 17

What are the characteristics of type III amelogenesis imperfecta (hypomineralized)?

Answer 17

• Enamel of normal thickness but soft, porous and shedding easily from the dentin.
• Normal shape at eruption.
• These teeth are very sensitive even to physical contact with a toothbrush.
• Soft enamel: less dense than dentin in radiographs.
• Grossly worn teeth (to gingival level)
• The color of enamel can range from white to creamy yellow-brown.

Question 18

What type of enamel defect is present for type III amelogenesis imperfecta?

Answer 18

qualitative

Question 19

What type of amelogenesis imperfecta does this show?

Answer 19

type III: hypomineralization

Question 20

What type of amelogenesis imperfecta does this show?

Answer 20

type II: hypomaturation

Question 21

What are characteristics of dentinogenesis imperfecta?

Answer 21

• Amber-like translucency (yellow to blue-gray)
• Enamel separates easily from dentin (faulty DEJ)
• Accelerated attrition → Anterior open bite
• Cervical constriction → bulbous crown
• Short and slender roots
• Partial or complete obliteration of pulp chambers and canals
• Types I, II and III

Question 22

What dentition is more severely affected by dentinogenesis imperfecta?

Answer 22

primary dentition

Question 23

What dental anomaly is this?

Answer 23

dentinogenesis imperfecta

Question 24

What dental anomaly is this?

Answer 24

dentinogenesis imperfecta

Question 25

What is type I dentinogenesis imperfecta?

Answer 25

* Associated with osteogenesis imperfecta * Mutation in collagen synthesis genes

Question 26

What is type II dentinogenesis imperfecta?

Answer 26

* No skeletal defects * Enlarged pulp chambers in primary teeth (occasional) --> eventually obliterated

Question 27

What is type III dentinogenesis imperfecta?

Answer 27

* Brandywine isolate * Found in people originating from southern Maryland * Enlarged pulp chambers (no obliteration) * Pulp exposure

Question 28

What dental anomaly is this?

Answer 28

dentinogenesis imperfecta

Question 29

What are examples of acquired abnormalities?

Answer 29

1) Attrition 2) Abrasion 3) Erosion 4) Third molar impaction

Question 30

What is attrition?

Answer 30

Physiologic wear of teeth

Question 31

What dental anomaly is this?

Answer 31

attrition

Question 32

What dental anomaly is this?

Answer 32

attrition

Question 33

What is abrasion?

Answer 33

Mechanical wear of teeth | caused by anything besides another tooth

Question 34

What dental anomaly is this?

Answer 34

abrasion

Question 35

What dental anomaly is this?

Answer 35

abrasion

Question 36

What is erosion?

Answer 36

Chemical wear of teeth

Question 37

What dental anomaly is this?

Answer 37

erosion

Question 38

What dental anomaly is this?

Answer 38

erosion

Question 39

What dental anomaly is this?

Answer 39

erosion

Question 40

What dental anomaly is this?

Answer 40

erosion

Question 41

What are the types of third molar impactions?

Answer 41

* I. Full impaction vs partial impaction * II. Orientation: – Vertical – Inverted – Mesioangular – Distoangular – Horizontal – Inverted mesioangular – Inverted distoangular

Question 42

What dental anomaly is this?

Answer 42

third molar impaction (distoangular)

Question 43

What dental anomaly is this?

Answer 43

third molar impaction (inverted and mesioangular)

Question 44

What dental anomaly is this?

Answer 44

third molar impaction (vertical and inverted)

Question 45

What dental anomaly is this?

Answer 45

third molar impaction (horizontal)

Question 46

What is the anomaly with this patient?

Answer 46

- supernumerary teeth

Question 47

Is there an anomaly?

Answer 47

No the patient is just turned

Question 48

What is the anomaly with this patient?

Answer 48

dens in dente type 1

Question 49

What is the anomaly with this patient?

Answer 49

ectodermal dysplasia (possibly)

Question 50

What is the anomaly with this patient?

Answer 50

- supernumerary teeth - distodens (4th molar)

Question 51

What is the anomaly with this patient?

Answer 51

amelogenesis imperfecta type 1

Question 52

What is the anomaly with this patient?

Answer 52

dentiogenesis imperfecta

Question 53

What is the anomaly with this patient?

Answer 53

curvature of the premolar root (laceration)

Question 54

What is the anomaly with this patient?

Answer 54

- curvature of the premolar root (laceration) - canine is moved (transposition)

Question 55

What is the anomaly with this patient?

Answer 55

- distodens (4th molar)

Question 56

What is the anomaly with this patient?

Answer 56

- supernumerary tooth (mesiodens)

Question 57

What is the anomaly with this patient?

Answer 57

gemination

Question 58

What is the anomaly with this patient?

Answer 58

amelogenesis imperfecta type 1

Question 59

What is the anomaly with this patient?

Answer 59

- dens invaginatus (on lateral incisor)

Question 60

What is the anomaly with this patient (another photo with the answer)?

Answer 60

- supernumerary teeth - dens in dente on premolars

Question 61

What is the anomaly with this patient?

Answer 61

- amelogenesis imperfecta type IV (hyperplastic) - taurodontism

Question 62

What is the anomaly with this patient?

Answer 62

- microdontia (3rd molars?)