Exam 1 - Teeth Developmental

Question 1

What is small/large teeth called?

Answer 1

• Small - microdontia
• Large - macrodontia

Question 2

What is it called when attempted division of tooth germ with incomplete formation of 2 teeth, usually a single root?

Answer 2

Gemination

Question 3

What is union of two tooth germs by dentin called? Often with individual roots

Answer 3

Fusion

Question 4

What is it called when teeth are joined by cementum (form of fusion)?

Answer 4

Concrescence

Question 5

What is the term for a bend or curve in tooth or root, possibly due to trauma, that may cause problems with extractions?

Answer 5

Dilacerations

Question 6

What is the term for invagination in enamel organ before calcification aka “tooth within a tooth”?

Answer 6

Dens-in-denta (Dens invaginatus)

Question 7

What are block-shaped teeth with large pulps called? Often associated with syndromes such as Klinefelter’s

Answer 7

Taurodontism

Question 8

What is an excess of enamel at bi or trifurcation of molars at CEJ?

Answer 8

Enamel pearl

Question 9

What is oligodontia/anodontia?

Answer 9

A few or no tooth development

Question 10

What are some common conditions that produce supernumerary teeth?

Answer 10

• Gardner’s syndrome
• Cleidocranial dysplasia (no clavicals)

Question 11

Describe Amelogenesis Imperfecta.

Answer 11

• Enamel
• Hereditary - autosomal dominant, recessive, sex-linked
• Produces - Hypoplasia, hypocalcification, hypomaturation

Question 12

How can you identify hereditary vs environmental amelogensis imperfecta?

Answer 12

• Hereditary
  
  • All teeth
  • Both dentitions
  • Family history
• Environment
  
  • Some teeth
  • One dentition
  • No family history

Question 13

What’s a common clinical sign of congenital syphilis?

Answer 13

• Hutchinson’s incisors
• Mulberry molars

Question 14

What causes Turner’s tooth?

Answer 14

Local infection or trauma

Question 15

How much fluoride would cause fluorosis?

Answer 15

> 1ppm

Question 16

What are some characteristics of dentinogensis imperfecta?

Answer 16

• Dominantly inherited genetic defect
• Both dentitions, all teeth
• Osteogenesis imperfecta
  
  • Brittle bones, blue sclera
• Teeth - gray to yellow-brown, enamel fractures from dentin, exposed dentin

Question 17

What’s the radiographic finding of dentinogenesis imperfecta?

Answer 17

• Obliteration of pulp chambers and canals +- attrition, -+root fractures

Question 18

What’s the treatment for dentinogensis imperfecta?

Answer 18

Crowns to prevent attrition

Question 19

Describe dentinal dysplasia.

Answer 19

• Autosomal dominant condition
• Pulp obliteration with abnormal dentin
• Defective roof formation
• Tendency for periapical pathology
• All teeth, both dentitions, appear normal

Question 20

What’s the radiographic finding with dentinal dysplasia?

Answer 20

• Obliteration of pulp
• Short underdeveloped roots
• Periapical radiolucencies

Question 21

Describe regional odontodysplasia?

Answer 21

• Ghost teeth
• Anomaly of unknown etiology
• Anomalous teeth often with very thin shell of enamel and dentin

Question 22

What do you call teeth that lack eruptive force?

Answer 22

Embedded teeth

Question 23

If generalized embedded teeth, what could be the cause?

Answer 23

Hypothyroidism

Question 24

What do you call teeth unerupted because of mechanical obstruction?

Answer 24

Impacted

Question 25

What are ankylosed teeth?

Answer 25

• Tooth roots fused to bone, often in primary teeth with underlying succedaneous permanent tooth missing
• Dinstinct percussion