Chp 6 Part 1 Tooth development and eruption

  1. After the initiation of odontogenesis the stages of tooth development include
    • bud stage
    • the cap stage
    • the bell stage
    • and the maturation stage
  2. What happens in the apposition phase of tooth development
    formation and maturation of the enamel, dentin and cementum
  3. Initiation->Bud->Cap->Bell->?
  4. The initial teeth for both dentitions develop in the ______ followed later by _____ and then _____
    • mandibular anteriors
    • maxillary anteriors
    • posteriorly in mandibular/maxillary
  5. The primary teeth develop during both the _____ and _____ period
    • embryonic
    • fetal
  6. Most of the permanent dentition is formed during the
    fetal period
  7. The first signs of tooth development are seen during the
    6th to 7th week.
  8. The thickened oral epithelium is known as the
    dental lamina
  9. The initiation stage, involves the process of
  10. Induction is
    the interaction between embryonic cells of the mesenchyme and the ectoderm
  11. All the teeth and their associated tissues develop from both
    ectoderm and mesenchyme, with influence by the neural crest cells
  12. The basement membrane
    An important acellular structure separates the oral epithelium and the mesenchyme (connective tissue) in the stomodeum
  13. Beginning in the 8th week, the oral epithelium grows deeper into the mesenchyme and is induced to produce a layer called
    dental lamina
  14. Lack of initiation results in the absence of ______ called ______
    • a single tooth or multiple teeth
    • anodontia
  15. The areas most commonly affected with supernumerary teeth are
    • Maxillary centrals (Mesiodens)
    • Distal to the maxillary 3rd molars (distomolar)
    • Premolar region (perimolar)
  16. The bud stage and occurs at the beginning of the
    8th week
  17. The tooth germ is developed from
    • the buds from the dental lamina and
    • mesenchyme
  18. What is the only growth occurring in the bud stage
  19. Mishaped permanent third molar
    Peg molar
  20. The cap stage occurs between the ____ and _____ weeks
    9th and 10th
  21. What growth is occurring in the cap stage of tooth development
    Proliferation differentiation and morphogenesis
  22. From these processes of proliferation, differentiation and morphogenesis in the cap stage, a depression occurs in the deepest part of each tooth bud of the dental lamina and forms
    a cap or enamel organ
  23. Enamel is a product of what germ layer
  24. Inner mass of mesenchyme deep to the bud
    dental papilla
  25. The dental papilla will give rise to the
    future dentin and pulp tissue
  26. The basement membrane between the enamel organ and the dental papilla is the site for the future
    dentinoenamel junction (DEJ).
  27. The remaining mesenchyme surrounding the outside of the cap or enamel organ condenses into
    the dental sac, or dental follicle
  28. The dental sac will give rise to
    periodontium, consisting of cementum, periodontal ligament and alveolar bone
  29. The tooth germ consist of what three structures
    • enamel organ
    • dental papilla
    • dental sac
  30. In what week has initiation started for the anterior teeth in the permanent dentition
    10th week
  31. succedaneous teeth
    Permanent teeth which replace primary teeth
  32. During the cap stage if the enamel organ  abnormally invaginates into the dental papilla it will result in
    dens in dente, or dens invaginatus
  33. ______ usually leaves  the tooth with a deep lingual pit
    • dens in dente
    • may appear as "a tooth within a tooth"
  34. If a single tooth germ tries unsuccessfully to divide into 2 tooth germs it will result in
  35. The union of two adjacent tooth germs resulting in large, falsely macrodontic tooth is called
  36. The bell stage occurs during weeks ____ and ____
    11th and 12th
  37. During the ____ stage differentiation occurs resulting in __ different cell types in the enamel organ
    • bell
    • 4
  38. What are the four different cell types in the enamel organ
  39. What kind of cells are in the outer enamel epithelium and what is it's purpose
    • Cuboidal
    • It will serve as a protective barrier for the rest of the enamel organ during enamel production
  40. What kind of cells are in the inner enamel epithelium and what does it give rise to
    • columnar
    • IEE will differentiate into enamel-secreting cells, ameloblasts
  41. The more outer ______ consisting of _____ shaped cells forming a ______ help _____
    • stellate reticulum
    • star
    • network
    • support the production of enamel
  42. The more inner ______ consisting of a compressed layer of _______ shaped cells help _______
    • stratum intermedium
    • flat to cuboidal
    • support the production of enamel
  43. At the ____ stage, the dental papilla will undergo differentiation and form what two layers
    • Bell
    • outer cells & central cells of the dental papilla
  44. In the future, the outer cells of the dental papilla will differentiate into
    dentin-secreting cells, odontoblasts
  45. In the future, the central cells are the
    premordium of the pulp
  46. What happens during the apposition stage
    during which the enamel, dentin and cementum are secreted in successive layers
  47. During apposition the _____, _______ and ______  are initially secreted as _____ which is ____
    • enamel, dentin and cementum
    • matrix
    • extracellular substance that is partially calcified and serves as a framework for later calcification
  48. When the dental tissues subsequently fully mineralize occurs in what stage
Card Set
Chp 6 Part 1 Tooth development and eruption
Chp 6 Part 1 Tooth development and eruption