Chp 6 Part 2 Tooth development and eruption

  1. Tooth development begins in the _____ and proceeds to the _____
    • crown
    • root
  2. The inner enamel epithelium (IEE) will grow even more columnar and differentiate into
    preameloblasts
  3. During the differentiation to preameloblast what is happened in the cells
    the nucleus in each cell moves away from the center of the cell to a position farthest away from the basement membrane
  4. After the IEE differentiates into ______ the _____ of the dental papilla are induced by the _____ to become ______
    • preameloblasts
    • outer cells
    • preameloblasts
    • odontoblast
  5. The odontoblast begin _______ which is the ______ in their side of the basement membrane
    • dentinogenesis
    • apposition of dentin matrix, or predentin
  6. What happens to the basement membrane after the odontoblast differentiates
    it disintegrates
  7. The _______ of the basement membrane causes the ______ and the _____ to come in direct contact with each other inducing the preameloblast to differentiate into ______
    • disintegration
    • preameloblasts
    • predentin
    • ameloblast
  8. The ameloblast begin ______ which is the _____
    • amelogenesis
    • apposition of enamel matrix
  9. The enamel matrix is secreted from _______ which is a _______ that faces the ______
    • Tome's process
    • tapered portion of each ameloblast
    • defunct basement membrane
  10. With the enamel matrix in contact with the _______ mineralization of the _______ occurs forming the ________
    • predentin
    • disintegrating basement membrane
    • dentinoenamel junction, DEJ
  11. The odontoblasts will leave attached cellular extensions in the length of the predentin called
    odontoblastic process
  12. Each odontoblastic process is contained in a mineralized cylinder called the
    dentinal tubule
  13. After the formation of the dentinoenamel junction, DEJ what happens to the cells in either side
    They retreat away
  14. The cell bodies of the odontoblast will
    remain within the pulp tissue
  15. The cell bodies of the ameloblast will
    will be involved in the tooth eruption and mineralization process but will be lost after eruption
  16. Local enamel dysplasia may result from
    trauma or infection of a small group of ameloblasts
  17. The structure responsible for root development is
    the cervical loop
  18. The cervical loop is the _____ and consist of the ______ and ______ only
    • most cervical portion of the enamel organ
    • IEE
    • OEE
  19. The function of Hertwig’s root sheath is
    to shape the roots and induce dentin formation in the root area
  20. Explain the absence of enamel in the root
    The root sheath induces odontoblastic differentiation but does not induce formation of ameloblasts because it is lacking the intermediate layers of the stellate reticulum and stratum intermedium
  21. When root dentin formation is completed the entire length of Hertwig’s root sheath
    disintegrates
  22. After the disintegration of the root sheath, its cells may become the
    epithelial rests of Malassez
  23. What happens to the epithelial rests of Malassez cells in the future
    These groups of epithelial cells become located in the mature periodontal ligament and can develop into cysts in the future
  24. Misplaced ameloblasts can migrate to the root area causing enamel to be abnormally formed on the root surface forming
    enamel pearls
  25. The apposition of cementum, or cementogenesis, in the root area also occurs when
    Hertwig’s root sheath disintegrates
  26. The disintegration of the Hertwig’s root sheath allows
    undifferentiated cells of the dental sac to come into contact with newly formed surface of the root dentin
  27. Contact of the dental sac cells with the dentin surface induces these cells to become immature
    cementoblasts
  28. Cementoblasts become mature
    cementocytes
  29. Many cementoblasts may become _____ by the cementum they produce
    entrapped
  30. As a result of apposition of cementum over the dentin the ________ is formed
    dentinocemental junction
  31. concrescence
    • the union of the roots of two or more teeth through the cementum
    • due to excess cementum formation
  32. The mesenchyme from the dental sac begins to form
    the periodontal ligament (PDL)
  33. The formation of the PDL involves
    forming collagen fibers that are immediately organized into the fiber bundles of the PDL
  34. The end of the collagen fibers in the PDL inserts into
    the outer portion of the cementum and the surrounding alveolar bone in order to support the tooth
  35. What is dilaceration and what does it result from
    • crown angulation in a formed tooth
    • distortion of Hertwig’s root sheath due to injury or pressure
  36. After enamel apposition ceases in the crown area of each primary or permanent tooth, the ameloblasts place an acellular
    dental cuticle or primary cuticle on the new enamel surface
  37. What is the reduced enamel epithelium (REE).
    • Compressed layers of the enamel cells
    • Outerenamel epithelium
    • Stellate reticulum
    • Stratum intermedium
  38. If a dentigerous cyst appears on an erupting tooth, it is called an
    eruption cyst
  39. Image Upload 1
    eruption cyst
  40. Where does the dentigerous cyst form
    around the crown of a nonerupted impacted or developing tooth, most commonly the third molars
  41. dentigerous cyst or follicular cyst
    An odontogenic cyst that forms from the REE after the crown has completely formed and matured
  42. What is Nasmyth’s membrane and what does it consist of
    • A residue that may form on newly erupted teeth of both dentitions that may leave the teeth extrinsically stained
    • the fused tissue of the REE and oral epithelium as well as the dental cuticle.
  43. The succedaneous permanent tooth erupts into the oral cavity in a position ________ to the roots of the shedding primary tooth
    lingual
  44. The permanent maxillary incisors erupts into the oral cavity in a position more ______
    facial
  45. During the eruption process as the REE and the oral epithelium touch they _______ which causes a release of _____ from the ____ that leaves an _______
    • fuse
    • enzymes
    • REE
    • epithelial tunnel
  46. As a primary tooth actively erupts into the oral cavity, the coronal portion of the reduced enamel epithelium ______ leaving the ______ portion still attached to the _____
    • peels back off the crown
    • cervical
    • neck of the tooth
  47. The REE that remains near the CEJ after the tooth erupts then serves as the ________which creates a ______ between the tissue and tooth surface
    • initial junctional epithelium of the tooth
    • seal
  48. The initial junctional epithelium is later replaced by a _______ as the ______ is formed
    • definitive junctional epithelium
    • root
  49. During the process of primary tooth loss what is the function of the osteoclasts
    absorb the alveolar bone between the exfoliating and erupting teeth
  50. During the process of primary tooth loss what is the function of the odontoclasts
    cause resorption of portions of the primary tooth’s root of dentin and cementum as well as small portions of the enamel crown
Author
haitianwifey
ID
323393
Card Set
Chp 6 Part 2 Tooth development and eruption
Description
Chp 6 Part 2 Tooth development and eruption
Updated