quiz on lecture 6 Flashcards
dental tissues pulp, dentin, and cementum are specialized forms of what major tissue type?
connective tissue
epithelial components becomes the enamel ______
organ
mouth epithelium and enamel comes from
ectoderm
derived from neural crest cells and forms the dental papilla
mesenchyme
derived from ectoderm and forms the enamel organ
oral epithelium
the oral epithelium grows deeper into the mesenchyme =
dental lamina(filled with oral epithelium)
shaping of the tooth
morphodifferentiation
cells differentiation into specific tissue forming cells
cytodifferentiation
enamel forming cells
ameloblasts
cementum forming cells
cementoblast
dentin forming cells
odontoblasts
pulp forming cells
fibroblasts
oral epithelium and the underlying mesenchyme are responsible for shaping a tooth, also called what
induction(1st stage)
extensive proliferation of the dental lamina into buds. the condensed area of mesenchymal cells are continuous with the oral epithelium
bud stage
the connection between the two layers(bud stage) is referred to as the
dental lamina(filled with oral epithelium)
the epithelial tissue gains a concave surface(enamel organ); a portion of the mesenchyme deep to the buds has condensed into a mass within the concavity
cap stage
(cap stage) the inner mass of mesenchyme is now called ____
dental papilla
the dental papilla helps form the
dentin and pulp for inner portion of tooth
the cementum, PDL and alveolar bone are formed from
dental follicle/sac
the area around the dental papilla is
dental follicle /sac
the enamel organ + dental papilla + dental follicle=
tooth germ(cap stage)
in the bell stage, what are the organized layers of the enamel organ (4 cell types)
OEE, IEE, stellate reticulum, stratum intermedium
in the bell stage, the dental papilla are divided into inner and outer cells =
inner cells, outer cells
inner cells will form
pulp
outer cells(aka peripheral cells) will differentiate into
odontoblasts(dentin)
replaces primary teeth, something that permanent molars are NOT
succedaneous
an overlapping period between primary and permanent dentition
mixed dentition
resorbs bone
osteoclasts
layering matrix; cells have differentiated into tissue forming cells. matrizes are all secreted
appositionally
with maturation, these tissues fully
mineralize
under cytodifferentiation, epithelial components become the enamel organ which is organized into 4 distinct layers
oee, iee, stratum intermedium, stellate reticulum
what do the four layers of the enamel organ do?
all help produce enamel
the outer cuboidal cells of the enamel organ
oee
the innermost, tall, columnar cells of the enamel organ on the concave side
iee
what will the iee of the enamel organ become?
will become the future enamel producing cells, the ameloblasts(preameloblasts)
compressed cells that lie on top of the iee
stratum intermedium
star shaped cells that fill the bulk of the enamel organ
stellate reticulum
the mesenchymal components become subdivided into:
dental follicle, dental papilla
surrounds the developing tooth germ and provides cells that will form the cementum, PDL, and alveolar bone
dental follicle
condensed mesenchyme located on the concavity side of the enamel organ
dental papilla
the outer cells(peripheral) will differentiate into dentin forming cells called
odontoblasts
the center of the dental papilla (inner cells) will become the:
pulp
between the oral epithelium and the mesenchyme. the mesenchyme instructs the epithelium to grow down into the mesenchyme and shape the tooth
1st interaction between epithelium and mesenchyme
the 1st interaction is also called
initiation stage
given by the cells of the IEE (preameloblasts) to the outer (peripheral) cells of the dental papilla to differentiate into odontoblasts to begin the deposition of dentin
2nd interaction
as soon as odontoblasts begin to deposit dentin, preameloblasts become true-secreting ameloblasts and begin the deposition of enamel
3rd interaction
occurs with the development of root dentin and cementum
4th interaction
when does dentinogenesis begin(which interaction)
2nd interaction
where dentin meets enamel
dentinoenamel junction (DEJ)
tome’s process does what
secretes enamel matrix
cells continue to make dentin how often?
as needed throughout life
daily cycles of secretion and mineralization create what? (associated with dentinogenesis)
incremental lines called lines of von ebner
each ameloblast has a secretory process, called what
tome’s process
what is the structure responsible for root development
cervical loop(oee and iee meet)
