Developmental Abnormalities

Question 1

Supernumerary Teeth

Answer 1

Single -> anterior posterior maxilla

Multiple -> posterior mandible

Question 2

Cleidocranial dysplasia

Answer 2

Have more teeth, missing clavicle

Delayed suture closing

Question 3

Gardners

Answer 3

Lots of osteomas and enostoses, coolon polyposis

Extra teeth

Question 4

Hypodontia

Answer 4

Failure of development of tooth derm

Ectodermal dysplasia (conical teeth) associated w. this

Question 5

Macrodontia

Answer 5

Enlargement of one tooth or group of teeth

Pituitary gigantism affects (young children)

Question 6

Microdontia

Answer 6

One or group of teeth

Happens in pituitary dwarfism and down syndrome

Question 7

Transposition

Answer 7

Teeth get out of order (canines and 1st premolars)

Question 8

Fusion

Answer 8

Union of adjacent tooth germs partially/totally

Less teeth present in arch

Most common in maxillary/mandibular anterior

Question 9

Concrescence

Answer 9

Teeth roots are fused via cementum

Question 10

Gemination

Answer 10

Single tooth bud divides partially or totally

Whole extra tooth or really big tooth

Question 11

Taurodontism

Answer 11

Clinically normal

Elongated pulp chambers and short roots

Amelogenesis imperfecta and down syndrome

Question 12

Dilaceration

Answer 12

Sahrp bend in crown or root

Maxillary premolars

Question 13

Dens in Dente

Answer 13

Infolding of enamel surface into pulp chamber

At cingulum

Question 14

Den invaginatus

Answer 14

Incisal edge

Question 15

Dilated odontome

Answer 15

Donut shaped tooth

Question 16

Dens evaginatus

Answer 16

Outpouching of enamel organ w/ a dentin core and pulpal horn

Occlusal surface of premolars/molars

Question 17

Enamel Pearls

Answer 17

Dentin core that form below CEJ

Molars

Can predispose to periodontal dz

Question 18

Talon Cusps

Answer 18

Hyperplasia of cingula

Maxillary or mandibular incisors

Question 19

Turner’s hypoplasia

Answer 19

Enamel defect in permanent tooth caused by injury to its predecessor

Question 20

Congenital Syphilis

Answer 20

Enamel and dentin hypoplasia in permanent incisors and first molars

Hutchinsons incisor
Mulberry Molars

Question 21

Regional Odontodysplasia

Answer 21

Ghost shell teeth.

Localized arrest in tooth development resulting in hypoplasia/hypocalcification

Question 22

Amelogenesis Imperfecta

Answer 22

Discolored, thin, pitted enamel that has same density as dentin or no enamel

Question 23

Dentinogenesis Imperfecta

Answer 23

Blue to brown teeth that have bulbous crowns w/ cervical restrictions
No pulp chambers

Question 24

Dentin Dysplasia

Answer 24

Radicular = roots of teeth, short malformed

Coronal = normal crowns w/ large thistle shaped pulp chambers and pulp stones

Question 25

Attrition

Answer 25

Physiologic wearing of teeth, flattened and thin cusps

Question 26

Abrasion

Answer 26

non-physiologic wear from foreign substances like floss

Question 27

Erosion

Answer 27

Wear of teeth from chemical action, smooth shiny depressions from acidic stuff

Question 28

Secondary Dentin

Answer 28

Dentin deposition due to aging or caries, shrinks pulp chambers

Question 29

Hypercementosis

Answer 29

excessive cementum deposition on teeth roots

Lamina dura and pdl space is normal