root formation

• root formation

  • beginning of root formation at the cervical loop area with its epithelial root sheath and epithelial diaphragm
  • 3 months of age
  • amelogenesis is finished kaya may enamel na
• hertwig's epithelial root sheath


  arise from the junction of IEE and OEE along the margins of dental organ
• epithelial diaphragm

  future apex of the root, remains fixed during development of the root

  horizontal plate
• hertwig's epithelial root sheath


  junction of IEE and OEE
• cervical loop


  meet of IEE and OEE
• cementoblast


  produce cementum
• the epithelial sheath will induce odontoblast that will form more matrix. sa pag form ng more matrix masisira si hertwig's. pag nasira papasok ang mga cell from dental follicle to come in contact with root dentin. pag nagcontact magdidifferentiate into cementoblast that will produce cementum.
• epithelial rest of malassez


  remnants of hertwigs
• the root sheath cells induce odontoblasts to form root dentin and then they degenerate allowing folicular cells to becomes cementoblast that align next to the dentin and form cementum
• reduce enamel epithelium REE

  • ree and oral epithelium will fuse to form solid mass then it will thicken to form the canal kaya pag nagerupt yung tooth hindi madugo
• anadontia


  absence of initiation stage
• supernumerary teeth


  hyperactivity of dental lamina
• peg shaped teeth


  absence of cusp or formation of extra cusps

  disturbance during morphodifferentiation
• enamel hypoplasia & dentin hypoplasia


  disturbance during apposition
• apposition


  desposition of matrix