For first year dental student, i got this from the internet.. Hope this can help u guys understand more about the tooth development.. Btw, good luck for minitest OB tomorrow.. No sacrifice, no victory!
Difference between primary and permanent teethprincesoni3954
The presentation features the basic difference between primary and permanent dentition. The differences are tabulated under the headings of crown, roor and pulp.
Amelogenesis is the formation of enamel. During amelogenesis, the ameloblast (enamel-forming cells) undergo various stages i.e the life cycle of ameloblast.
For more content check out my blog: www.rkharitha.wordpress.com "a little about everything dental"
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Radiographic Assessment of the Prevalence of Pulp Stones in Malaysians
Kannan et al.
JOE — Volume 41, Number 3, March 2015
Pulp stones are discrete calcified bodies found in the dental pulp.
They have calcium phosphorous ratios similar to dentin and can be seen in healthy, diseased, or even unerupted teeth
Radiographically, pulp stones appear as radiopaque structures in the pulp space that frequently act as an impediment during endodontic treatment
THEORIES OF ERUPTION
ERUPTION SEQUENCE
PHYSIOLOGY OF TOOTH ERUPTION
CELLULAR BASIS
MOLECULAR BASIS
PRODUCTION OF OSTEOCLAST
ANOMOLIES OF TOOTH ERUPTION
A Brief Description about the development of teeth. Understanding the process of tooth development is of particular importance for the dentist; as developmental disturbances may occur at any stage of this process resulting in different types of tooth anomalies.
Tooth development can be classified either based on morphology or histology
Morphological stages:
Bud stage
Cap stage
Bell stage:
* Early
* Advanced
Physiological stages:
Initiation
Proliferation
Histodifferentiation
Morphodifferentiation
Apposition
Difference between primary and permanent teethprincesoni3954
The presentation features the basic difference between primary and permanent dentition. The differences are tabulated under the headings of crown, roor and pulp.
Amelogenesis is the formation of enamel. During amelogenesis, the ameloblast (enamel-forming cells) undergo various stages i.e the life cycle of ameloblast.
For more content check out my blog: www.rkharitha.wordpress.com "a little about everything dental"
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Radiographic Assessment of the Prevalence of Pulp Stones in Malaysians
Kannan et al.
JOE — Volume 41, Number 3, March 2015
Pulp stones are discrete calcified bodies found in the dental pulp.
They have calcium phosphorous ratios similar to dentin and can be seen in healthy, diseased, or even unerupted teeth
Radiographically, pulp stones appear as radiopaque structures in the pulp space that frequently act as an impediment during endodontic treatment
THEORIES OF ERUPTION
ERUPTION SEQUENCE
PHYSIOLOGY OF TOOTH ERUPTION
CELLULAR BASIS
MOLECULAR BASIS
PRODUCTION OF OSTEOCLAST
ANOMOLIES OF TOOTH ERUPTION
A Brief Description about the development of teeth. Understanding the process of tooth development is of particular importance for the dentist; as developmental disturbances may occur at any stage of this process resulting in different types of tooth anomalies.
Tooth development can be classified either based on morphology or histology
Morphological stages:
Bud stage
Cap stage
Bell stage:
* Early
* Advanced
Physiological stages:
Initiation
Proliferation
Histodifferentiation
Morphodifferentiation
Apposition
BE UPDATE TO IT,, AS IT IS 3 years back from 2017
Kindly mail me if you feel, needy of this presentation
you can find my mail id @ slide share,,, if not mail me @
sukesh3567@gmail.com.
Good luck
The initiation of tooth development begins at 37 days of development
with formation of a continuous horseshoe-band of thickened epithelium
in the location of upper and lower jaws – Primary Epithelial Band
Dental lamina appears as a thickening
of the oral epithelium adjacent to
condensation of ectomesenchyme
20 areas of enlargement or knobs
appear, which will form tooth buds
for the 20 primary teeth
Not all will appear at the same time.
The first to develop are those of the
anterior mandible region
At this early stage the tooth buds
have already determined their crown morphology
Successional lamina: lamina from
which permanent teeth develop
The dental lamina begins to function
at 6th prenatal week and continues to
15th year of birth (3rd molar)
Tooth development is a continuous process, however can be
divided into 3 stages:
1. Bud Stage
2. Cap Stage
3. Bell Stage
4. Hertwigs epithelial root sheath and root formation
The bud stage is represented by the first epithelial incursion into the ectomesenchyme of the jaw.
The epithelial cells show little if any change in shape or function.
The supporting ectomesenchymal cells are packed closely beneath and around the epithelial bud. As the epithelial bud continues to proliferate into the ectomesenchyme, cellular density increases immediately adjacent to the epithelial outgrowth.
This process is classically referred to as a condensation of the ectomesenchyme.
The epithelium of the dental lamina separated from the underlying ectomesenchyme by basement membrane.
Bud stage is characterized by rounded, localized growth of
epithelium surrounded by proliferating mesenchymal cells,which are packed closely beneath and around the epithelial buds
The transition from bud to cap marks the onset of morphologic differences between tooth germs that give rise to different types of teeth.
Differential cellular division in the epithelial bud initiates a change in shape so that now the epithelial outgrowth assumes a more complex outline with a flattened internal portion along which the mesenchymal condensation densifies.
As the tooth bud grows larger, it drags along with it part of the dental lamina; thus from that point on, the developing tooth is tethered to the dental lamina by an extension called the lateral lamina.
At this early stage of tooth development, identifying the formative elements of the tooth and its supporting tissues is already possible.
The epithelial outgrowth, which superficially resembles a cap sitting on a ball of condensed ectomesenchyme , is still referred to widely as the dental organ but actually should be called the enamel organ, because it eventually will form the enamel of the tooth. Henceforth, the term enamel organ is used.
Condensation of the ectomesenchyme immediately subjacent to the tooth bud caused by lack of extracellular matrix secretion by the cells thus preventing separation.
Upload By : Ahmed Ali Abbas
Babylon University College of Dentistry
download this file from Website on google theoptimalsmile.wix.com/dentistry
Oral histology
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The early development of tooth from six week of prenatal life. Description of different stages- bud,cap and bell stage and amelogenesis, dentinogenesis. Description of root development.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
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Introduction to AI for Nonprofits with Tapp NetworkTechSoup
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
1. Development of Teeth
Dr. Khaldoun Darwich
Specialist in Oral and Maxillo-Facial Surgery – Hamburg University
PhD – Hamburg University
Academic Teacher - Department of OMF Surgery in Damascus University
Instructor and Academic Advisor in IUST
2. Overview
Initiation of Tooth
development
Stages of tooth
development
Development of the
dental papilla
Dentinogenesis
Amelogenesis
Crown Maturation
Development of the
Tooth Root
Development of
supporting structures
3.
4.
5. Each of us began life as a single cell, a zygote.
The zygote produces a ball of cells (the morula)
which in turn produces the Human embryo.
However, the actual development of Teeth starts
at approximately 6-7 weeks after conception.
6.
7. In the human 20 primary and 32
permanent teeth develop from the
interaction of the oral epithelial cells and
the underlying mesenchymal cells .
8. Each tooth develops through three successive
early stages :
1. Bud stage.
2. Cap stage.
3. Bell stage.
9. During these early stages the tooth germs
grow and expand and the cells that are to
form the hard tissues of the teeth
differentiate.
Differentiation takes place in the bell
stage setting the stage for enamel and
dentin formation
10. As the crowns are formed and
mineralized the roots of the teeth begin
to form
After the roots calcify the supporting
tissues of the teeth (the cementum,
periodontal ligament, and alveolar bone)
begin to develop
Subsequently the completed tooth crown
erupts into the oral cavity
11. Root formation and cementogenesis
continue until a functional tooth and its
supporting structures are fully
developed
12.
13. Developmentally missing permanent
teeth can be a result of a genetic
abnormality.
When fewer than 6 teeth are missing it is
termed Hypodontia
When more than 6 teeth are missing it is
oligodontia
15. Teeth develop from 2 types of cells:
1- oral epithelial cells form the enamel organ
2- mesenchymal cells form the dental papilla
in addition the neural crest cells contribute to
tooth development
16. The first sign of tooth formation is the
development of dental lamina rising from the
oral epithelium
18. The Dental lamina develops into a sheet of
epithelial cells that pushes into the underlying
mesenchyme around the perimeter of both the
maxillary and mandibular jaws .
19.
20. At the leading edge of the lamina 20 areas of
enlargement appear which form tooth buds for
the 20 primary teeth .
After primary teeth develop from the buds the
leading edge of the lamina continues to grow to
develop the permanent teeth , which succeed
the 20 primary teeth . This part of the lamina is
called the successional lamina
21.
22. The lamina continues posteriorly into the
elongating jaw and from it come the posterior
teeth , which form behind the primary teeth .
In this manner 20 of the permanent teeth
replace the 20 primary teeth and 12 posterior
permanent molars develop behind the primary
dentition
The last teeth to develop are the 3rd molars ,
which develop about 15 years after birth
23. The lamina continues posteriorly into the
elongating jaw and from it come the posterior
teeth , which form behind the primary teeth .
In this manner 20 of the permanent teeth
replace the 20 primary teeth and 12 posterior
permanent molars develop behind the primary
dentition
The last teeth to develop are the 3rd molars ,
which develop about 15 years after birth
24. the primary teeth and permanent molars form
from the general lamina
The anterior permanent teeth which succeed the
primary teeth form from the successional lamina
The initiating dental lamina that forms both the
successional and general lamina begins to
function in the 6th prenatal week and continues
to function until the 15th year producing all 52
teeth
25. Each tooth develops through three successive
early stages :
1. Bud stage.
2. Cap stage.
3. Bell stage.
Each stage is defined according to the shape of
the epithelial enamel organ which is a part of the
developing tooth
26. Is a rounded localized growth of epithelial cells
surrounded by proliferating mesenchymal cells.
27.
28. Gradually as the rounded epithelial bud
enlarges it gains a concave surface.
30. After further growth of the papilla and the enamel
organ the tooth reaches the morphodifferentiation
and histodifferentiation stage also known as the
bell stage.
At this stage the inner enamel epithelial cells are
characterized by the shape of the tooth they form
31. The cells of the enamel organ have differentiated
into the outer enamel epithelial cells which cover
the enamel organ , and inner enamel epithelial cells
which become the ameloblasts that form the
enamel of the tooth crown
Between the 2 cell layers are the stellate reticulum
cells, which are star shaped with processes attached
to each other
32. A fourth layer in the enamel organ is composed of
stratum intermedium cells , which lie adjacent to
the inner enamel epithelial cells. They assist the
ameloblast in the formation of enamel
The function of the outer enamel epithelial cells is
to organize a network of cappillaries that will bring
nutrition to the ameloblasts
35. Cells in the periphery of the dental papilla become
odontoblats (differentiate from mesenchymal cells)
These cells elongate and become columnar and
form a matrix of collagen fibers identified as
predentin which becomes dentin
When several increments of dentin have formed the
differentiated ameloblasts deposit an enamel
matrix
36. After the enamel organ is differentiated the dental
lamina begins to degenerate by undergoing lysis.
Cells interact through a system of effectors ,
modulators, and receptors called cell signaling.
37. Densley packed cells characterize the dental papilla
This is evident in the early bud stage during which cells
proliferate around the enlarging tooth buds at the leading
edge of the dental lamina
The papilla cells are significant in furthering enamel organ
bud formation into the cap and bell stage
Blood vessels (nutrition) appear early in the dental papilla
along with nerve fibers
Cellular changes result in formation of a hard shell around
the central papilla , as this occurs the papilla becomes the
dental pulp
40. As the odontoblasts elongate, a process develops at the
proximal end of the cell adjacent to the dentinoenamel
junction
Gradually the cell moves pulpward and the cell process
known as the odontoblast process elongates
Increments of dentin are formed along the dentinoenamel
junction
The dentinal matrix is first a meshwork of collagen fibers,
but within 24 hours it becomes calcified
It is called predentin before calcification and dentin after
calcification
The odontoblasts maintain their elongating processes in
dentinal tubules
42. The collagenous dentinal matrix is laid down in increments
like bone or enamel , which is indicative of a daily rhythm
for hard tissue formation
The site of initial formation is at the cusp tips
As the odontoblastic process elongates a tubule is
maintained in the dentin , and the matrix is formed around
this tubule
Dentinogenesis takes place in 2 phases . First is the collagen
matrix formation, followed by the deposition of calcium
phosphate (hydroxyapatite) crystals in the matrix .
44. Calcification :
The initial calcification appears as crystals that are in small
vesicles on the surface and within the collagen fibers
The crystals grow, spread and coalesce until the matrix is
completely calcified.
Only the newly formed band of dentinal matrix along the
pulpal border is uncalcified
Mineralization proceeds by an increase in mineral density
of the dentin
As each daily increment of predentin forms along the pulpal
boundary the adjacent peripheral increment of predentin
formed the previous day calcifies and becomes dentin
46. Ameloblasts begin enamel deposition after a few
micrometers of dentin have been deposited at the
dentinoenamel junction
At the bell stage cells of the inner enamel epithelium
differentiate, they elongate and are ready to become active
secretory ameloblasts.
47. the ameloblasts exhibit changes as they differntiate in 5
functional stages :
1- morphogenesis
2- organization and differentiation
3- secretion
4- maturation
5- protection
48. Short conical processes (Tomes’ processes) develop at the
apical end of the ameloblasts during the secretory stage
Junctional complexes called the terminal bar apparatus
appear at the junction of the cell bodies and tomes’
processes and maintain contact between adjacent cells
the first enamel deposited on the surface of the dentin
establishes the dentinoenamel junction
As the enamel matrix develops , it forms in continuous
rods from the dentinoenamel junction to the surface of
the enamel
50. When ameloblasts begin secretion , the overlying cells of
the stratum intermedium change in shape from spindle to
pyramidal .
Substances needed for enamel production arrive via the
blood vessels and pass through the stellate reticulum to
the stratum intermedium and ameloblasts
In this manner the protein amelogenin is produced.
Only a few ameloblasts at the tip of the cusps begin to
function initially
As the process proceeds more ameloblasts become active
and the increments of enamel matrix become more
prominent
51.
52.
53.
54. Is a genetic problem in which the enamel is poorly
developed and mineralized
It can be the result of cellular malfunction resulting in
defective enamel matrix formation