Lecture Summary: Developmental Disorders

Question 1

macroglossia
____ tongue
can be _____ or _____

Answer 1

enlarged, acquired, developmental

Question 2

macroglossia developmental associations

Answer 2

neurofibromatosis, Down syndrome, congenital hypothyroidism

“cretinism”

Question 3

microglossia
___ tongue
can occur as part of _________

Answer 3

small, oromandibular-limb hypogenesis syndrome

Question 4

features of oromandibular-limb hypogenesis syndrome

Answer 4

hypodactyly (fewer fingers/toes than normal) and hypomelia

underdeveloped organs

Question 5

absence of one or more teeth

Answer 5

hypodontia

Question 6

oligodontia (absence of ___ teeth) is much more common than _____ (absence of all teeth)

Answer 6

some, anodontia

Question 7

hyperdontia definition

Answer 7

extra tooth (most common is just one extra tooth)

Question 8

microdontia definition

Answer 8

smaller than normal teeth. (most common: peg lateral, 3rd molar)

Question 9

macrodontia definition

Answer 9

larger than normal teeth

Question 10

one tooth bud gives rise to two crowns (number of teeth=___)

Answer 10

gemination, normal

Question 11

two tooth buds give rise to one tooth (number of teeth= ______)

Answer 11

fusion, decreased

Question 12

concrescence is when two teeth are connected by _____, most common in ____

Answer 12

cementum, Mx molars

Question 13

extra cusp on lingual surface of anterior tooth

Answer 13

talon cusp

Question 14

extra cusp on Mx molar

Answer 14

Cusp of Carabelli

Question 15

extra cusp on premolar/molar tooth

Answer 15

dens evaginatus

Question 16

are dens evaginatus prone to fracture?

Answer 16

yes, they are

Question 17

dens invaginatus

• invagination of _______ by enamel
• more common in ____
• _______: large invagination

Answer 17

• crown or root lined
• maxilla
• dens in dente