tooth development Flashcards
teeth are derived from
primary epithelial band
primary epithelial band gives rise to
- dental lamina
2. vestibular lamina
what supports the primary epi band
ectomesenchyme
teeth come from
dental lamina
space between cheek and teeth come from
vestibular lamina
bud structure form on
dental lamina
invasion of the epithelium into ectomesenchyme
bud stage
histodifferentiation begins at what stage
cap stage
what structures can you see during cap stage
- enamel organ
- dental papilla
- dental follicle
what forms the enamel of the tooth
enamel organ
the condensed ectom cells become
dental papilla
what forms the dentin and pulp
dental papilla
what does the dental follicle do
limits dental papilla and surrounds dental organ
supporting tissues of tooth come from
dental follicle
layers from dental papilla inward during bell stage
dental papilla, inner enamel epi, stratum intermedium, stellate reticulum
inner enamel epithelium is
columnar shaped cells
what new structure is present at bell stage (region where IEE and OEE meet)
cervical loops
cervical loops become what
roots
is there hard tissue formation in bell stage
no
what is in the center of the enamel organ
stellate reticulum
what two structures make enamel
stratum intermedium and inner enamel epithelium
separates enamel organ from dental papilla (acellular zone filled with collagen fibrils)
basal lamina
where do the first secreted enamel matrix proteins accumulate
acellular zone
what happens to dental lamina during bell stage
fragmentation
acellular zone becomes
dentinoenamel junction
inner enamel epi becomes
ameloblasts (enamel)
dental papilla becomes
- odontoblasts (dentin)
- fibroblasts +
undiff mesench cells (pulp)
dental follicle becomes
cementoblasts (cementum), fibroblasts (PDL), osteoblasts (alveolar bone)
what processes occur during crown stage
dentinogenesis and amelogenesis
what causes elimination of the acellular zone
dentinogenesis
cervical loop becomes
hertwig’s epithelial root sheath (HERS)
what does Hertwig’s epi root sheath do
induce differentiation of odontoblasts from mesenchymal cells at periphery of pulp
*makes root dentin
hertwig’s eventually becomes
epithelial cell rests of Malassez
what connects the remnants of the dental lamina to the overlying oral mucosa
gubernacular cord
what resorbs the bone over the erupting tooth and the roots of the deciduous tooth
osteoclasts, odontoclasts
how does the tooth erupt
through the gubernacular canals
