Chapter 6 Tooth Development Stages

Front 1

Odontogenesis

Back 1

process of tooth development

Front 2

Dentition

Back 2

used to describe the natural teeth in the jaws

Front 3

there are 2 dentitions which are

Back 3

primary and permanent

Front 4

odontogensis takes place in stages which occur in what fashion

Back 4

sequential

Front 5

odontogensis begins between what weeks of the prenatal development

Back 5

sixth and seventh week

Front 6

stages of tooth development

Back 6

bud stage, cap stage, and the bell stage

Front 7

apposition stage

Back 7

is the formation of the partially mineralized dental tissue types such as enamel, dentin and cementum. then finally reaches the maturation stage

Front 8

physiological processes

Back 8

induction

proliferation

differentiation

morphogensis

maturation

Front 9

first stage of tooth development is

Back 9

initiation stage

Front 10

initiation stage

Back 10

involves the physiologic process of induction which is an active interaction between the embryologic tissue types

Front 11

at the beginning of the ________ week. the embryos stomodeum is lined by __________

Back 11

sixth week

ectoderm

Front 12

the outer part of the ectoderm gives rise to the

Back 12

oral epithelium

Front 13

oral epithelium

Back 13

consists of 2 horseshoe shaped bands of tissue at the surface of the stomodeum, one band for each future arch

Front 14

deep to the forming oral epithelium is a type of mesenchyme called

Back 14

ectomesenchyme- derived from NCC's

Front 15

structure that separates the oral epithelium and the ectomesenchyme is the

Back 15

basement membrane

Front 16

dental lamina

Back 16

during seventh week. oral epithelium grows deeper into ectomesenchyme and produces this layer

Front 17

anodontia

Back 17

initiation stage disturbance.

lack of initiation within the dental lamina result in absence of single tooth or multiple teeth

Front 18

anodontia can be associated with the syndrome _____

Back 18

ectodermal dysplasia

Front 19

supernumerary teeth

Back 19

one or more extra teeth

Front 20

bud stage

Back 20

begins at eighth week.

extensive proliferation of dental lamina

Front 21

at the end of the proliferation process both the future maxillary and mandibular arch with have _____ buds

Back 21

10

Front 22

macrodontia

Back 22

abnormally large teeth

Front 23

microdontia

Back 23

abnormally small teeth

Front 24

cap stage

Back 24

ninth and tenth week.

tooth germ forms

morphogenesis is the predominant process during the cap stage, this process forms a cap shape of the enamel organ

Front 25

enamel organ

Back 25

deepest part of each tooth bud

Front 26

dental papilla

Back 26

mass within the concavity of the cap of the enamel organ.

this produces the future dentin and pulp.

basement membrane still exists but is now between enamel organ and dental papilla, then this later forms into dentinoenamel junction

Front 27

dental sac

Back 27

surrounds the outside of the cap of the enamel organ.

produces periodontium

Front 28

tooth germ is what 3 things combined

Back 28

enamel organ, dental sac, dental papilla

Front 29

nonsuccedanous

Back 29

have no primary predecessors, or no teeth that were in the position before it

Front 30

during the cap stage, the enamel organ may abnormally be turned inside out resulting in

Back 30

dens in dente

Front 31

gemination

Back 31

occurs as single tooth germs that tries unsuccessfully to divide into 2 tooth germs, which results in a large SINGLE ROOTED tooth w enlarged pulp cavity.

exhibits "twinning" but only has one root

Front 32

fusion

Back 32

results from the union of 2 adjacent tooth germs.

leads to macrodontic tooth

SHOWS 2 PULP CAVITIES

Front 33

tubercles

Back 33

small round enamel extensions forming extra cusps

Front 34

bell stage

Back 34

eleventh and 12th week

ongoing process of proliferation differentiation and morphogenesis.

during this 4 different types of cells are now found within the enamel organ

Front 35

4 different types of cells found during bell stage are

Back 35

outer enamel epithelium (OEE)-outer cuboidal cells. serves as protective barrier

stellate reticulum-star shaped cells

stratum intermedium- flat cells

IEE- columnar cells. turns into ameloblasts

Front 36

ameloblasts

Back 36

enamel secreting cells

Front 37

dental papilla goes through histodifferentiation to now consist of 2 types of tissues

Back 37

outer cells of the dental papilla and central cells of dental papilla

Front 38

outer cells of dental papilla turn into

Back 38

odontoblasts

Front 39

central cells of dental papilla turn into

Back 39

primordium of the pulp

Front 40

apposition stage

Back 40

enamel, dentin and cementum are secreted in layers.

then secreted as a matrix.

Front 41

preameloblasts

Back 41

innermost cells grow even more columnar as they elongate and differentiate after the formation of IEE

Front 42

cellular repolarization

Back 42

movement of the nuclei in each IEE cell occurs during

Front 43

dentinogenesis

Back 43

appositional growth of dentin matrix

Front 44

amelogensis

Back 44

appositional growth of enamel matrix

Front 45

tomes process

Back 45

angled distal part of each ameloblast that faces the basement membrane

Front 46

dentinoenamel junction

Back 46

the inner junction between the dentin and the enamel tissue,

mineralization of the basement membrane

Front 47

odontoblastic process

Back 47

odontoblasts leave attached cellular extensions in length of predentin

Front 48

dentinal tubule

Back 48

odontoblastic process is contained in a mineralized cylinder

Front 49

enamel dysplasia

Back 49

faulty development of enamel. factor that interferes with metabolic processes of ameloblast.

Front 50

local enamel dysplasia

Back 50

may result from trauma or infection occurring to small group of ameloblasts

Front 51

systemic enamel dysplasia

Back 51

involves large numbers of ameloblasts.

may result from traumatic birth

systemic infections

nutritional deficiencies

dental fluorosis

Front 52

enamel hypoplasia

Back 52

results from a reduction in the quantity of enamel matrix.

the teeth then appear with pitting and grooves in the enamel surface

Front 53

hutchinson incisors

Back 53

crown w a screwdriver shape that is wide cervically and narrow incisally

Front 54

mulberry molars

Back 54

have enamel tubercles on cusps on occlusal surfaces

Front 55

enamel hypocalcification

Back 55

results in reduction in the QUALITY of the enamel maturation.

teeth appear more opaque, yellow or browner

Front 56

turner spot

Back 56

single affected area or white sparkle spot is called

Front 57

dental fluorosis

Back 57

ingestion of excess amounts of fluoride

Front 58

dentin dysplasia

Back 58

faulty development of dentin.

can result from interference w metabolic processes of odontoblasts during dentinogenesis

Front 59

dentinogenesis imperfecta

Back 59

type of dentin dysplasia

this results in blue/gray or brown teeth with an opalescent sheen