Odontogenesis (Part 2)

tooth germs
adjacent

Topic: Developmental Stages

The development of the _____ _____ is initiated, and the cells continue to proliferate faster than the ______ cells

tooth enamel

Topic: Tooth Bud Stage

What is the main function of the certain epithelial cells of the tooth bud? To form the….

epithelial cells of the tooth bud

Topic: Tooth Bud Stage

What is critical for a normal tooth development

columnar
polygonal

Topic: Tooth Bud Stage

In the bud stage enamel organ consists of peripherally located low _______ cells and centrally located ______ cells

mesenchyme
mitosis

Topic: Tooth Bud Stage

Cells of the tooth bud and surrounding ______ undergo _____

neural crest
ectomesenchymal
condense

Topic: Tooth Bud Stage

Cells of the tooth bud and surrounding mesenchyme undergo mitosis results in:

Migration of ____ ___ cells into the _______ cells surrounding the tooth bud and ____

mitosis

Division of somatic cells

Dental papilla

Topic: Tooth Bud Stage

The area of ECTOMESENCHYMAL CONDENSATION immediately subjacent to the enamel organ

ectomesenchymal condensation

Topic: Tooth Bud Stage

Dental papilla, the area of ________ ______ immediately subjacent to the enamel organ

Dentin and Pulp

Topic: Tooth Bud Stage

Cells in the Dental Papilla will form: ____ and ___

Dental sac

Topic: Tooth Bud Stage

What is the condensed ECTOMESENCHYME that surrounds the TOOTH BUD and the DENTAL PAPILLA

tooth bud
dental papilla

Topic: Tooth Bud Stage

Dental Sac, condensed ECTOMESENCHYME that surrounds the ____ ___ and the ____ ____

cap and bell

Topic: Tooth Bud Stage

Both the dental papilla and the dental sac become more well defined as the enamel organ grows into the ___ and ____ stages

cementum and periodontal ligament

Cells in the Dental Sac will form: _____ and ______ ______

Dental organ/Enamel organ
Dental papilla
Dental sac/Dental follicle

What are the three parts of the Tooth Bud?

oral epithelium
enamel

Topic: Parts of the Tooth bud

Dental organ/Enamel organ

• Derived from:

• Produces:

mesenchyme
pulp and dentin

Topic: Parts of the Tooth bud

Dental papilla

• Derived from:

• Produces:

mesenchyme
cementum and periodontal ligament

Topic: Parts of the Tooth bud

Dental sac/Dental follicle

• Derived from:

• Produces:

Ameloblast

Topic: Tooth Bud
What is the correct answer?
Dental organ/Enamel organ
A. Ameloblast
B. Odontoblast
C. Cementoblast

Odontoblast

Topic: Tooth Bud

What is the correct answer?
Dental papilla

A. Ameloblast
B. Odontoblast
C. Cementoblast

Cementoblast

Topic: Tooth Bud

What is the correct answer?
Dental sac/Dental follicle

A. Ameloblast
B. Odontoblast
C. Cementoblast

ectoderm

Topic: Tooth Bud

What is the correct answer?
Dental organ/Enamel organ:

Ectoderm or Ectomesenchyme

Ectomesenchyme

Topic: Tooth Bud

What is the correct answer?
Dental papilla:

Ectoderm or Ectomesenchyme

Ectomesenchyme

Topic: Tooth Bud

What is the correct answer?
Dental sac/Dental follicle:

Ectoderm or Ectomesenchyme

ENGKKK MALI KASI DI KA NAG PAALAM

ANO YUNG BONE BETWEEN THE TWO HEARTS?

A - root of tooth
B – dentin
C – predentin
D – epithelial diaphragm
E – outer dental epithelium
F – epithelial rests
G – odontoblasts

Formation of the Epithelial Diaphragm

Identify each letter

Histodifferentiation or bell stage (early bell stage)

what stage is when the invagination of the epithelium deepens and its margin continue to grow, the enamel organ assumes a ___ _____

membrana performativa

Dental Papilla

The basement membrane that separated the enamel organ and the dental papilla, just prior to dentin formation called ______ ________

denser and more fibrous dental sac

what is important in the formation of cementum and periodontal ligament?

sac
ectomesenchyme

Dental ___:

• Concomitant with the development of the enamel organ and dental papilla

• There is a marginal condensation in the _________ surrounding the enamel organ and dental papilla

inner enamel epithelium
stratum intermedium
stellate reticulum
outer enamel epithelium

what are the types of epithelial cells that can be distinguished on bell stage of enamel organ? (x4)

inner enamel epithelium

Topic: Types of epithelial cells on bell stage of enamel organ

Consists of single layer of cells that differentiate prior to amelogenesis into tall columnar cells called ameloblasts

amelogenesis
ameloblasts

Topic: Types of epithelial cells on bell stage of enamel organ

Inner enamel epithelium, consists of single layer of cells that differentiate prior to ______ into tall columnar cells called ______

amelobasts

what do you call an epithelial cells from which tooth enamel is formed

4-5
40
mesenchymal
dental papilla

Topic: Types of epithelial cells on bell stage of enamel organ

Inner enamel epithelium
- These cells are ? - ? micrometers (um) in diameter and about _?_ (um) high
- The cells exert an organizing influence on underlying ________ cells in the ____ _____

stratum intermedium

Topic: Types of epithelial cells on bell stage of enamel organ

Few layers of squamous cells located between enamel epithelium and stellate reticulum

stratum intermedium

Topic: Types of epithelial cells on bell stage of enamel organ

what layer seems to be essential to enamel formation and is absent in the part of the tooth germ that outlines the root portions of the tooth

cap stage

what is characterized by shallow invagination on the deep surface of the bud

cap stage

As the tooth bud continues to PROLIFERATE ,it DOES NOT expand uniformly into a larger sphere,

• INSTEAD, unequal growth in different parts of the tooth bud leads to ____ _____

outer enamel epithelium
inner enamel epithelium
stallate reticulum (enamel pulp)

what are the layers of cells seen in early cap stage? (x3)

outer enamel epithelium

Topic: Layers of cells seen in early cap stage

peripheral cells of the cap stage, cuboidal in shape that cover the convexity of the cap

cuboidal

Topic: Layers of cells seen in early cap stage

Outer enamel epithelium of the cap stage,
what covers the convexity of the cap?

inner enamel epithelium

Topic: Layers of cells seen in early cap stage

are the columnar cells in the concavity of the cap

stellate reticulum

Topic: Layers of cells seen in early cap stage

Polygonal cells located in the center of the enamel organ, between the outer and inner enamel epithelia, begin to separate as more INTERCELLULAR FLUID is produced and form the ______ ______

between the outer and inner enamel epithelia

Topic: Layers of cells seen in early cap stage

The polygonal cells of the stellate reticulum (enamel pulp) is located where?

intercellular fluid
stellate reticulum

Topic: Layers of cells seen in early cap stage

Stellate reticulum (enamel pulp):
Polygonal cells located in the center of the enamel organ, between the outer and inner enamel epithelia, begin to separate as more __________ _____ is produced and form the ______ ______

enamel knot
enamel cord

What are the accessory or temporary structures during cap stage?

enamel knot

Topic: Accessory or temporary structures during cap stage

cells in the center of the enamel organ that projects in part toward the underlying dental papilla, so that the center of the epithelial invagination shows a KNOBLIKE ENLARGEMENT

act as a reservoir of diving cells for the growing enamel organ

Topic: Accessory or temporary structures during cap stage

what is the function of the enamel knot and enamel cord?

enamel cord

Topic: Accessory or temporary structures during cap stage

A VERTICAL extension of the enamel knot

disappear
formation

Topic: Accessory or temporary structures during cap stage

ENAMEL KNOT and ENAMEL CORD are TEMPORARY STRUCTURES that ______ before the enamel ______ begins

enamel organ
enamel knot
dental follicle
denta papilla
bone

Label the picture

Histodifferentiation or Bell Stage (early bell stage)

What stage does the invagination of the epithelium DEEPENS and its MARGINS CONTINUE TO GROW?

dentinoenamel junction

Topic: Processes during Bell Stage

The boundary between inner enamel epithelium and odontoblast outline the future ________ ______

odontoblast

connective tissue cells that develop into dentin

Hertwig’s epithelial root sheath

Topic: Processes during Bell Stage

Cervical portion of the enamel organ gives rise to what?

Ameloblasts
Odontoblasts

Topic: Processes during Bell Stage

continuation of histodifferentiation
is where ______ and ______ are defined

crown

Topic: Processes during Bell Stage

Beginning of morphodifferentiation
- Tooth _____ assumes its final shape

startum intermedium

Topic: Types of Epithelial Cells during Bell Stage

what type of epithelial cells is absent in portion of the tooth that OUTLINES THE ROOT PORTIONS of the tooth

intercellular fluid

Topic: Types of Epithelial Cells during Bell Stage

In stellate reticulum it expands further and is mainly increased amount of ______ _____

star
processes

Topic: Types of Epithelial Cells during Bell Stage

Stellate reticulum:
SHAPE: ____ shaped, with long _______

squamous

Topic: Types of Epithelial Cells during Bell Stage

stratum intermedium has few layers of _____ cells

outer enamel epithelium

Topic: Types of Epithelial Cells during Bell Stage

→ SHAPE: flattened cells to a low cuboidal form (LOW CUBOIDAL)
→ laid in FOLDS during:

• End of the bell stage

• Preparatory to and during the

  formation of enamel

capillary loops

Topic: Types of Epithelial Cells during Bell Stage

Outer enamel epithelium:
→ BETWEEN THE FOLDS: papillae that contains ________ _____ form

capillary loops

Topic: Types of Epithelial Cells during Bell Stage

Outer enamel epithelium:

The _____ ____ provides rich, nutritional supply for the INTENSE METABOLLIC ACTIVITY

A – cervical loop
B – stellate reticulum
C – enamel septum
D – inner dental epithelium
E – stratum intermedium
F – dental lamina
G – outer dental epithelium
H – dental papilla

Label the picture from A-H

epithelial diaphragm

Prior to beginning of root formation, root sheath forms the ______ _____

CEJ

Topic: Hertwig’s epithelial root sheath and root formation

Development of the root begins after the enamel and dentin formation has REACHED THE FUTURE ___

calcified

Topic: Hertwig’s epithelial root sheath and root formation

Development of the root begins when the outline of the crown has been established BUT BEFORE the full crown is ______

enamel organ

Topic: Hertwig’s epithelial root sheath and root formation

plays an important part in root development and forms the Hertwig’s epithelial root sheath (HERS)

moulds the shape of the roots

initiates radicular dentin formation

Topic: Hertwig’s epithelial root sheath and root formation

functions of Hertwig’s epithelial root sheath

cervical loop

Topic: Hertwig’s epithelial root sheath and root formation

_____ ____ is where the outer and inner enamel epithelium come together and where the cells continue to divide until the tooth crown attains its FULL SIZE

zone of reflexion

Topic: Hertwig’s epithelial root sheath and root formation

what is the other term for cervical loop?

epithelial diaphragm

Topic: Hertwig’s epithelial root sheath and root formation

HERS bend sharply inward in order to form a plane known as ______ _____

apical boundary

Topic: Hertwig’s epithelial root sheath and root formation

HERS bend sharply inward in order to establish the ______ _________ of the dental papilla

guide the shape and number of the roots

Topic: Hertwig’s epithelial root sheath and root formation

function of HERS and Epithelial diaphragm

vertical epithelial root sheath

Topic: Determination of Number of Roots

what continues to grow longer, forming root LENGTH

horizontal epithelial diaphragm

Topic: Determination of Number of Roots

what continues to grow inward toward the midline of the tooth

- this inward growth will determine the number of roots

mono rooted

Topic: Determination of Number of Roots

what happens when the circumference grows EVENLY

bi rooted

Topic: Determination of Number of Roots

what happens when 2 areas opposite one another grows INWARD more rapidly and meet

- it will separate into 2 columns of root formation

tri rooted

Topic: Determination of Number of Roots

forms when 3 areas grow INWARD

multirooted teeth

Topic: Determination of Number of Roots

what do you call when the point where the epithelial diaphragm meet is the FURCATION/TRIFURCATION of the tooth

rest of malassez

what happens when HERS loses its structural continuity and close relation to the surface of the root and its remnants persists as an epithelial network of strands

periodontal ligament of erupted teeth

where is the rest of malassez located

morphodifferentation

basic form and relative size of future tooth is established by differential growth

Dentino enamel junction and dentino cement junction

In morphodifferentation what are the characteristic for each type of tooth, acts as blueprint pattern

morphodifferentation

Disturbances in _______ may affect form and size of tooth without impairing the function of amloblast and odontoblast

apposition

→ deposition of the matrix of the hard dental structures and has layer-like deposition of extracellular matrix

→ is the FULFILLMENT OF PLANS OUTLINE at the stages of histodifferentiation and morpho differentiation

calcification period

During what period is when the process by which organic tissue (matrix formed during apposition), becomes HARDENED

- By a deposit of CALCIUM or any mineral salts within its substance

eruption peiod

During what period is when the process through which the FORMING TOOTH comes into and tries to MAINTAIN OCCLUSION
→ continues throughout the LIFETIME of the tooth

Fusion

→ UNION of 2 separate tooth germs
→ if the contact occurs BEFORE CALCIFICATION:

- The 2 teeth may be completely united to form a SINGLE LARGE TOOTH

dens evanginatus

→ An ACCESSORY CUSP OR GLOBULE of enamel
→ LOCATION: Between the buccal and lingual cusps of premolars (unilaterally/bilaterally)
→ ALSO CALLED:
- Leong’s premolar
- Evaginated odontome
- Occlusal tuebrculated premolar
- Occlusal enamel pearl

hutchinson’s teeth

→ congenital
→ hypoplasia
→ involves permanent INCISORS (notched incisor) and FIRST MOLAR (mulberry molar)

enameloma

→ small island of enamel
→ LOCATION; usually found on the root surface, close to CEJ

hawk billed tooth

angulation or sharp bend/curve in the root or crown of a formed tooth

Fusion
Dens Evanginatus
Hutchinson’s teeth

developmental anomalies of the crown (x3)

Enamel pearls/enamel drops/enameloma
Dilaceration or hawk billed tooth

developmental anomalies of the root

dentino enamel junction and dentino cement junction

what are the characteristic for each type of tooth, acts as a blueprint pattern

inner epithelium and outer epithelium

Hertwig’s epithelial root sheaths consist of what?

notched incisors

Topic: Hutchinson’s teeth

what do you call if it involves permanent incisors