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ODONTOGENESIS
Dr. Brian E. Esporlas
Stages in the life cycle of a
tooth
1. Growth
Physiologic process
a.  Initiation
b.  Prolifiration
c.  Histodifferentiation
d.  Morphodifferentiation
e.  Apposition
2. Calcification
3. Eruption
4. apposition
3 developmental process before
function
   Grow
   Calcify
   Erupt

   Unlike kidney and heart.. Afte growth ..
    Function
   Unlike bone… growth and calcify… function
Initiation stage
   6th weeks intra
    uterine life: first sign
    of tooth
    development
   Dental lamina:
    represent the first
    sign of tooth
    development. This
    is the GERMINAL
    BAND OF
    EPITHELIUM
Function of dental lamina
   Initiate the development of the whole
    deciduous dentition
   Initiate the development of the succedenuous
    teeth, by proliferation of bud from enamel
    organ
   Initiates the development of the accesional
    teeth from the distal extention of the dental
    lamina
Vestibular lamina
   After the dental
    lamina, the
    vestibular lamina will
    arise as another
    ectodermal
    thickening, but
    anterior to the dental
    lamina.
   Then this will split to
    form the vestibular
    groove the future
    vestibule.
Bud stage
   At certain point on DL
    representing the location of
    10 manibular and 10
    maxillary deciduous teeth
    cells multiply still more rapidly
    and form a knob like
    projections oward the
    mesoderm
   Down ward growth creating
    dental sac, dental papila and
    dental organ
   For the mandibular anterior
    6th to 7 weeks
   Max anterior 7th to 7 ½ week
   Deciduous molars 8th week
Cap stage
   The epithelial bud
    will continue to
    proliferate and
    expand latrally
   Defferent part of the
    bud will show
    unequal growth
    leading to the
    formation of a cap
    stage dental organ(
    with invagination)
3 layers of cap stage
 Outer dental epithelium
 Inner dental epithelium

 Stellate reticullum
  (enamel pulp,
 Filled with mucoid fluid
  rich in albumin)
Star shape cell
 During late cap stage

 Stratum intermedium :
  flat cell between inner
  dental epithelium and
  stalate reticulum.
   Enamel knot: bud like enlargement , germinal
    center for the demand of cell growth of tooth
   Enamel cord: vertical extension of the enamel
    knot that maintain the cap shape dental organ
   Enamel naval: attachment of enamel cord to
    outer dental epithelium
Bell stage
   .Dental lamina
    2.Dental sac or follicle
    3.Outer dental
    epithelium
    4.Stellate reticulum
    5.Inner dental
    epithelium
    6.Dental papilla
    7.Enamel cord
    8.Enamel navel
    9.Blood vessel
    10.Enamel niche
    11.Successional
    dental lamina
Dental papilla
   The invaginated part of
    the dental organ is
    occupied by
    condensation of
    mesenchymal tissues.
   Peripheral cells (
    cuboidal – columnar)
    differentiates into
    odontoblast through the
    stimulation of the cell of
    the IEE
   ODONTOBLAST –
    formtive cell of dentin
   Central part will be the
    pulp
Membrana preformativa
   Former basement
    membrane
    (separating the
    dental papilla from
    the IDE
   FUTURE dentino
    enamel junction
Tooth germ and dental sac
    During bell stage, the mesodermal tissue
     arround the enamel orgarn and the dental
     papilla differentiates into connective tissue
     capsule, dental sac.
    As a resulth 3 tooth germs are developed.
a.    Dental organ – will give rise to enamel tissue
b.    Dental papilla – give rise to dentin and pulp
c.    Dental sac – give rise to cementum, pdl and
      alveolar bone.
Dental organ
   Give rise to enamel
   Play an active role in the formation of dentin
   Play a role in formation of root via HERS or
    hertwig’s epithelial root sheath. (from the
    junction of the IDE and ODE)
   Produces enamel cuticle: last product of
    ameloblast
   Remain as epithelial attachment of the neck of
    the toth after the tooth has erupted
histodifferentiation
   Peripheral cells of the inner dental epithelium
    differentiates into ameloblast (formative cells
    of enamel)
   With the influence of the ameloblast, the
    formative layer of dentin known as the
    ODONTOBLAST are formed from the cells of
    the periphery of the dental papill
Morphodifferentiation
   The shape and form of the crown is determine
    by the membrana preformativa
Fate of dental lamina
   The remnant should be calcified and be
    resorbed by osteoclast because it has no
    function
   But, some group of epithelial cells may persist
    to stay (called gland of serres) and
    differentiates into ENAMEL
    MASS, SUPERNUMERARY
    TEETH, TUMORS OR CYST (
    ameloblastoma)

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Stages of Tooth Development & Odontogenesis Explained

  • 2. Stages in the life cycle of a tooth 1. Growth Physiologic process a. Initiation b. Prolifiration c. Histodifferentiation d. Morphodifferentiation e. Apposition 2. Calcification 3. Eruption 4. apposition
  • 3. 3 developmental process before function  Grow  Calcify  Erupt  Unlike kidney and heart.. Afte growth .. Function  Unlike bone… growth and calcify… function
  • 4. Initiation stage  6th weeks intra uterine life: first sign of tooth development  Dental lamina: represent the first sign of tooth development. This is the GERMINAL BAND OF EPITHELIUM
  • 5. Function of dental lamina  Initiate the development of the whole deciduous dentition  Initiate the development of the succedenuous teeth, by proliferation of bud from enamel organ  Initiates the development of the accesional teeth from the distal extention of the dental lamina
  • 6. Vestibular lamina  After the dental lamina, the vestibular lamina will arise as another ectodermal thickening, but anterior to the dental lamina.  Then this will split to form the vestibular groove the future vestibule.
  • 7. Bud stage  At certain point on DL representing the location of 10 manibular and 10 maxillary deciduous teeth cells multiply still more rapidly and form a knob like projections oward the mesoderm  Down ward growth creating dental sac, dental papila and dental organ  For the mandibular anterior 6th to 7 weeks  Max anterior 7th to 7 ½ week  Deciduous molars 8th week
  • 8. Cap stage  The epithelial bud will continue to proliferate and expand latrally  Defferent part of the bud will show unequal growth leading to the formation of a cap stage dental organ( with invagination)
  • 9. 3 layers of cap stage  Outer dental epithelium  Inner dental epithelium  Stellate reticullum (enamel pulp,  Filled with mucoid fluid rich in albumin) Star shape cell  During late cap stage  Stratum intermedium : flat cell between inner dental epithelium and stalate reticulum.
  • 10. Enamel knot: bud like enlargement , germinal center for the demand of cell growth of tooth  Enamel cord: vertical extension of the enamel knot that maintain the cap shape dental organ  Enamel naval: attachment of enamel cord to outer dental epithelium
  • 11. Bell stage  .Dental lamina 2.Dental sac or follicle 3.Outer dental epithelium 4.Stellate reticulum 5.Inner dental epithelium 6.Dental papilla 7.Enamel cord 8.Enamel navel 9.Blood vessel 10.Enamel niche 11.Successional dental lamina
  • 12.
  • 13.
  • 14. Dental papilla  The invaginated part of the dental organ is occupied by condensation of mesenchymal tissues.  Peripheral cells ( cuboidal – columnar) differentiates into odontoblast through the stimulation of the cell of the IEE  ODONTOBLAST – formtive cell of dentin  Central part will be the pulp
  • 15. Membrana preformativa  Former basement membrane (separating the dental papilla from the IDE  FUTURE dentino enamel junction
  • 16. Tooth germ and dental sac  During bell stage, the mesodermal tissue arround the enamel orgarn and the dental papilla differentiates into connective tissue capsule, dental sac.  As a resulth 3 tooth germs are developed. a. Dental organ – will give rise to enamel tissue b. Dental papilla – give rise to dentin and pulp c. Dental sac – give rise to cementum, pdl and alveolar bone.
  • 17. Dental organ  Give rise to enamel  Play an active role in the formation of dentin  Play a role in formation of root via HERS or hertwig’s epithelial root sheath. (from the junction of the IDE and ODE)  Produces enamel cuticle: last product of ameloblast  Remain as epithelial attachment of the neck of the toth after the tooth has erupted
  • 18. histodifferentiation  Peripheral cells of the inner dental epithelium differentiates into ameloblast (formative cells of enamel)  With the influence of the ameloblast, the formative layer of dentin known as the ODONTOBLAST are formed from the cells of the periphery of the dental papill
  • 19. Morphodifferentiation  The shape and form of the crown is determine by the membrana preformativa
  • 20. Fate of dental lamina  The remnant should be calcified and be resorbed by osteoclast because it has no function  But, some group of epithelial cells may persist to stay (called gland of serres) and differentiates into ENAMEL MASS, SUPERNUMERARY TEETH, TUMORS OR CYST ( ameloblastoma)