List
The
primitive oral cavity is also known as the  
Stomodeum
The
epithelial lining of the primitive oral cavity is best described as   
Stratified
squamous epithelium
The
buccopharyngeal membrane is formed by  
Oral
ectoderm and endoderm of foregut
The
buccopharyngeal membrane ruptures & the primitive oral cavity establishes
a connection with the foregut at about the 
27th
day of gestation
The
dental lamina forms when the human embryo is 
6
weeks old
The
dental lamina serves as a primodium for the 
Ectodermal
portion of teeth. It serves as a primodium for the ectodermal portion of the
deciduous teeth.
The
development of the 1st permanent molar is initiated at 
4th
month intrauterine life 
The
development of the 2nd permanent molar is initiated at 
1st
yr after birth
The
bud of non-successional permanent teeth develops from lamina due to  
Distal
proliferation. Or as a distal extension of the dental lamina. Sometimes this
distal extension extend deep in to the ramus causing the development of teeth
(especially third molars) in the ramus.
The
bud of successional permanent teeth develops from lamina due to  
Lingual
proliferation.  Or as a lingual
extension of the free end of the dental lamina opposite to the enamel organ
of each deciduous teeth.
The
development of successional lamina extends from  
Fifth
month intrauterine life  to 10 months
of age
The
activity of the dental lamina extends over a period of at least  
5years
The
vestibular lamina is located _________ to the dental lamina  
Buccal
The
lip furrow band is also known as  
Vestibular
lamina
The
first deciduous tooth bud to be formed is in the  
Anterior
maxilla
The
development stages of teeth are named after the shape of  
Epithelial
component
In
bud stage of teeth development, enamel organ consists of   
Peripheral
low columnar cells & central polygonal cells
The
local grouping of ectomesenchymal cells that fails to produce extracellular
substances and not separated from each other in and around the enamel organ
is referred to as the  
Condensation.
Induction is the ability to induce changes or differentiation. Maturation is
the cells attaining the features and characteristics it was designed to show
and differentiation is the ability of a group of developing cells to change
from one group to other with new characteristics under some influence.
The
area of ectomesenchymal condensation sub adjacent (below) to enamel organ
is  
Dental
papilla
The
condensed ectomesenchyme that surrounds the tooth bud is the  
Dental
sac
The
dental papilla will give rise to  
Pulp
and dentin. By the inductive effect of the inner enamel epithelium, the
superficial ectomesenchymal cells of dental papilla differentiate in to
odontoblasts that form the dentin. 
The
dental sac will give rise to  
Cementum
and periodontal ligament. Once the epithelial root sheath of Hertwig is
broken the newly formed radicular or root dentin is exposed and exerts an
inductive influence on the dental sac or follicle cells to form the
cementoblast and the periodontal ligament.
Cap
stage is the stage where the enamel organ undergoes 
Proliferation.
Unequal proliferation and enlargement of the enamel organ and tooth bud is a
characteristic feature of the stage. The type and place of proliferation
depends upon the type of teeth.
In
cap stage of teeth development, the inner enamel epithelium is  
Tall
columnar and in concavity
In
cap stage of teeth development, the outer enamel epithelium is 
Cuboidal
and in convexity
During
odontogenesis, the layer which has a cushion like consistency & gives
support to the delicate enamel forming cells is the 
Stellate
reticulum
Parts
of tooth bud
Epithelium
and central cell
Parts
of enamel organ
Inner
and outer enamel epithelium, stellate reticulum and stratum intermedium
The
enamel pulp of the enamel organ is also called  
Stellate
reticulum
Stellate
reticulum in bell stage of odontogenesis is rich in   
Albumin.
Inner dental epithelium demonstrates high quantities of glycogen, Stratum
intermedium is rich in alkaline phosphatase and capillaries do not come
inside this epithelial part of the tooth bud. The cells of stellate reticulum
are formed by the fluid accumulation between the polygonal cells of the tooth
bud. They assume a branched reticular form and rich in albumin content
turning them mucoid or mucinous. This gives a cushioning effect as well as to
serve for increased nutritional demand latter.
Structure
in enamel organ that does not disappear before enamel formation begins is
Enamel
cord and Enamel knot
A
localized, transient epithelial thickening of inner enamel epithelium in bell
stage of odontogenesis is  
Enamel
knot
A
localized, linear, transient epithelial thickening of inner enamel epithelium
extending to outer enamel epithelium in bell stage of odontogenesis is  
Enamel
cord. It is also known as the enamel septum that divides the tooth in to two
halves and is reported to be involved in the determination of the initial
position of the first cusp to be formed and by cusp pattern by differential
cell division. Enamel niche is an artifact created by the plane of section,
where it creates an illusion of a tooth germ having a double attachment by a
double strand.
The
layer of cells which have been demonstrated to have a high degree of
metabolic activity in bell stage of teeth development is the 
Stratum
intermedium. Well developed cytoplasmic organelles, high amounts of acid
mucopolysaccharides and glycogen deposits indicate the high metabolic
activity that is carried out in this layer.
The
inner enamel epithelium differentiates in to the ameloblasts in the 
Late
bell stage
The
organizing influence of the inner enamel epithelium on the surrounding
ectomesenchyme forms the 
Odontoblast.
The dentin and dentin matrix are secreted by the odontoblasts. Cementum is by
the inductive influence of radicular dentin on the cells of the dental
follicle or dental sac.
The
layer that is associated with enamel formation other than inner enamel
formation in bell stage of odontogenesis is the 
Stratum
intermedium. This layer is closely associated with enamel formation which
comes from the histological proof that it is absent in those part of tooth
germ that out lines the tooth germ but does not form the enamel.
During
the transition from bell to late bell stage of odontogenesis, expansion of
stellate reticulum occurs by accumulation of  
Accumulation
of fluids
Stellate
reticulum starts to collapse just before the  
Enamel
formation. It happens just before the enamel is formed. This event begins at
the height of cusp or incisal edge. This reason for this is debated. Older
view is that it occurs to reduce the distance between ameloblasts and the
capillaries near the outer enamel epithelium, as the nutrients cannot diffuse
the newly formed dentin and enamel. Now it is argued that the collapse is due
to the continuous differential cell division adjacent to the areas of the
cusp tip towards the outer enamel epithelium and is purely due to pushing
nature of the cells.
The
shape of outer enamel epithelium in bell stage of tooth development is   
Low
cuboidal. From the cuboidal shape in cap stage it flattens and forms folds on
its outer surface during the enamel formation bringing the much needed
nutritional supply closer to the ameloblasts, hence this functional
adaptation.
Membrana
preformitiva separates  
Enamel
organ and dental papilla. It is the basement membrane.
Membrana
preformitiva appears  
Prior
to dentin formation
The
organizing influence of the inner enamel epithelium on the surrounding
ectomesenchyme is evident in the  
Bell
stage. It is seen as a cuboidal cell that latter turn in to a columnar form
to produce the dentin.
Before
the formation of the dental tissues the fibers of the dental sac are arranged
in  
Circular
fashion, Just like a capsule
The
acellular zone of dental papilla in bell stage of odontogenesis contains
Aperiodic
fibrils. Though it is acellular few collagen like fibrils with out the periodic
banding is observed in this otherwise empty space.
The
epithelial remnants called the cell rests of Malassez are found in the  
Periodontal
ligament of erupted teeth      
Cell
rests of Malassez are the remnants of the   
Hertwig’s
epithelial root sheath
The
shape of a crown is primarily determined by the 
Cessation
of mitotic division. In the bell stage, the differential cessation of the
mitotic division of the inner enamel epithelial cells brings about the shape
of a crown.
The
number of blood capillaries in dental papilla increases during  
Histodifferentiation.
This occurs maximally at the initiation of crown stage of tooth formation.
Development
of root formation begins after the enamel and dentin deposition reaches
the   
Future
cementoenamel junction
Prior
to root formation, the Hertwig’s epithelial root sheath forms the  
Cervical
loop. Just prior to the root formation a bend at the area where inner and
outer enamel epithelium meets forms the epithelial diaphragm at the area of
future cementoenamel junction.
If
the continuity of the Hertwig’s epithelial root sheath is broken prior to
dentin formation, a defect in the pulp wall occurs with no  
Dentin
and cementum. Often seen in pulpal floor of furcation and is the cause of
accessory root canal formations. This defect is localized and often very
small.
The
proliferation of the cells of the epithelial diaphragm is accompanied by
proliferation of the cells of the connective tissue of the  
Pulp
Enamel
pearls are sometimes found in   
Furcation
area of roots of permanent molars. This occurs when the cells of the
Hertwig’s epithelial root sheath remain adherent to the radicular dentin and
becomes active to produce the enamel.
The
crown stage of tooth development begins with  
Dentin
deposition
As
a result of lack of initiation the tooth that is most commonly missing
is  
Upper
lateral incisor
Histodifferentiation
succeeds the stage of  
Proliferation
The
process of histodifferentiation reaches highest in the    
Bell
stage
An
important stage of morphodifferentiation in the crown, outlining the
future             dentinoenamel
junction is evident in
Advanced
bell stage
Morphodifferentiation
is impossible without  
Proliferation
Disturbances
in morphodifferentiation will not affect the  
Function
of ameloblasts. It may form supernumerary cusp or roots, twinning, loss of
cusps or roots and malformed teeth.
Apposition
is the physiologic process relating to the  
Formation
of enamel & dentin matrix

Which teeth of
the permanent dentition have no deciduous predecessors?

Molars 

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