tooth development Flashcards
primary teeth start appearing around age of
6 months
complete primary dentition by
2.5 to 3 years
mixed dentition has primary and permenant teeth from ages
6-13 years
histological stages of tooth development
intiation proliferation differentiation apposition calcification eruption attrition
dental lamina
membrane band containing organs of future teeth
and corresponds to future arch arrangement
Outer enamel epithelium (OEE): (2)
outermost part of structure
DIRECT continuation of basal layer of epithelium
Inner enamel epithelium (IEE):
cells which outline the concavity in the deepest part
stellate reticulum
cells in the middle of (IEE) and (OEE)
differentiation occurs because of the appearance of x which also encourage cell growth
specialized germ cells
Odontoblasts: encourage cell growth to form x
• Ameloblasts: encourage cell growth to form x
• Cementoblasts: encourage cell growth to form root covering x
• Fibroblasts: encourage cell growth to form the x and x
• Osteoblasts: encourage cell growth to form x
dentin enamel cementum periodontal ligament and pulp alveolar bone
The entire primary dentition is initiated between week x and x of embryonic
development
6 and 8
The successional permanent teeth are initiated between week x in utero and
x months after birth, and the permanent molars between week x in utero
and x years of age
week 20
10 months
week 20
5 years
20 teeth in the x. They begin
erupting into the oral cavity at approx x and are all fully erupted
by x
remaining as the sole dentition until x
primary dentition
6 months
2.5 to 3 years
5 years
which teeth do not have pre cursors
permanent molars
formation of dentine begins around
week 18
when does root formation begin
after dentinogenesis and amelogenesis
Summary of tooth formation
Origins
Components
of the tooth
germ
Cells of the
tooth germ
Products
phases of eruption
pre-eruptive tooth movement
eruptive tooth movement
post eruptive tooth movement
pre eruptive movement
caused by primary and permanent tooth germs in jaw tissue before they erupt
eruptive tooth movement
caused by tooth moving its position in jaw bone to occlusion position
posteruptive tooth movment
maintaining position of erupted tooth in occlusion while jaws grow
a fibrous connective tissue strand that overlies successional teeth and connects them to the lamina propria of the overlying oral mucosa
gubernacular
cord
