DH 1350 quiz 5 chap 6 root development

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anatomy2012
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283501
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DH 1350 quiz 5 chap 6 root development
Updated:
2014-09-22 17:52:12
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quiz chapt part II
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root development
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  1. The earliest sign of human tooth development is found in the anterior mandibular region at the embryonic age of about
    5 to 6 weeks
  2. Which embryonic structure is specifically responsible for the development of the root
    cervical loop
  3. Hertwig's epithelial root
    sheath (HERS) may be described as
    Part of the cervical loop that functions to shape the root(s) and induce root dentin formation.
  4. Hertwig's epithelial root sheath (HERS)
    is entirely composed of:
    inner and outer enamel epithelium
  5. The cervical loop is the most cervical part of the _______ , a bilayer rim that consists only of ____ and ______
    • enamel organ
    • inner enamel epithelium
    • outer enamel epithelium
  6. Epithelial rests of Malassez may be described as
    • A network of cells in the periodontal ligament composed of the remains
    • of the inner and outer enamel epithelium
  7. When HERS disintegrates and allows undifferentiaed cells of the dental sac to contact the newly formed surface of root dentin, the dental sac cells are induced to become immature ________
    cementoblasts
  8. Which of the following is compressed during tooth development to form the reduced enamel epithelium
    enamel organ
  9. If a tooth has two roots, how many horizontal epithelial extensions or flaps will be involved in its root formation
    two
  10. Which of the following statements
    concerning active eruption of a permanent succedaneous tooth is CORRECT?

    The tooth
    erupts when the root is completed.

    The shedding of the associated primary
    tooth is intermittent.

    The first junctional epithelium is from the surrounding dental sac.

    The tooth actively erupts as gingival recession occurs.
    The shedding of the associated primary tooth is intermittent
  11. Match each dental anomaly listed with
    its description.

    Dwarf roots
    Concrescence
    Dilaceration
    Mulberry molars
    Gemination
    Dens in dente
    define
  12. Tooth eruption begins at the time the:

    First dentin is produce

    The tooth root is completed

    The tooth root begins to form

    The hard
    tissues of the tooth have been mineralized
    the tooth root begins to form
  13. The normal events which finally result
    in the shedding of a deciduous maxiallary molar tooth are:

    The deciduous tooth roots undergo a continuous, very slow resorption owing to the
    presence of the developing permanent molar

     The deciduous tooth roots are resorged one a a time, beginning ususally with the with the mesiobuccal root; the developing permananet tooth which will replace the deciduous molar is first seen starting to form after the deciduous root resorptin begins, and it promotes additional resorption

    The deciduous tooth roots resorb rapidly the tooth loosens and is exfoiated exposing the fully formed but uncalcified corwn of the permanent tooth.
      
    The deciduous tooth roots are slowly resorbed for a time; then for a brief period there is additonal formation of cementum and adjacent bone, resulting in reattachment of the periodontal ligament fibers and a tightening of the tooth in the bone; this is
    followed by root resorption; alternating wresorption and appostion take palse
    before the tooth finally loses it attachment
    • The deciduous tooth roots are slowly resorbed for a time; then for a
    • brief period there is additonal formation of cementum and adjacent bone,
    • resulting in reattachment of the periodontal ligament fibers and a tightening of the tooth in the bone; this isfollowed by root resorption; alternating wresorption and appostion take palsebefore the tooth finally loses it attachment
  14. In the development of a
    permanent tooth, the time that the root formation is completed is about
    one to four years after the tooth emerges
  15. The enamel organs of all tooth germs develop from the dental lamina. In the development of certain permanent teeth, the enamel organ arises from the dental lamina lingual to the developing tooth germ of certain primary teeth. The permanent teeth of which this true are
    all incisors, canines, and premolars
  16. The enamel organs of all tooth germs develop from the dental lamina. In the development of certain permanent teeth, the enamel organ arises from the distal end of the dental lamina distal to the last primary tooth in the arch. The permanent teeth of which this true are
    all permanent molars
  17. The diagram below depicts the conditions in the oral cavity before the process of tooth eruption begins.
    Label the parts A, B, C, D,  and E accordingly:

    oral epithelium
    enamel
    dentin
    reduced enamel epithelium
    REE
    enzymes
    • oral epithelium
    • enamel
    • dentin
    • reduced enamel epithelium REE
    • enzymes
  18. A residue on newly erupted teeth of both dentitions that may leave teeth extrinsically stained, and is the residue of the REE, oral epithelium, and cuticle placed by the ameloblasts is:
    nasmyth membrane
  19. Which portion of the tooth germ is the primary source of the periodontal ligament

    dental follicle/dental sac

    Herwig's epithelial root sheath

    stratum intermedium

    central cells of dental papilla

    outer cells of the dental papilla
    dental follicle/dental sac

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