DH 1350 Quiz 11 chapter 12

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anatomy2012
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DH 1350 Quiz 11 chapter 12
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2014-11-15 23:14:43
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DH 1350 quiz 11 chapter 12
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DH 1350 quiz 11 chapter 12
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  1. Enamel develops from which of the following embryonic tissues?

    ectoderm
    ectomesenchyme
    mesoderm
    endoderm
    Both ectoderm and ectomesenchyme
    Both ectomesenchyme and mesoderm
    ectoderm
  2. After the ameloblasts are finished with both enamel apposition and maturation, they  become part of the reduced enamel
    [Blank].
    epithelium
  3. Enamel matrix is first formed in the _____ part of the tooth near the forming DEJ.
    incisal/occlusal
  4. Enamel _____ are the crystalline structural unit of enamel.
    rods
  5. Enamel matrix is produced by the ___ cells.
    ameloblast
  6. Which of the following describes a pronounced band due to the trauma of birth present on the cross section of both enamel and dentin?

    line of Retzius
    imbrication line of von Ebner
    neonatal line
    contour line of Owen
    perikymata
    neonatal line
  7. Which of the following cell types is NOT renewable during the lifetime of the tooth?

    ameloblasts
    odontoblasts
    odontoclasts
    cementoblasts
    ameloblasts
  8. What is the chemical formula for the
    crystalline structure of mature enamel?

    Ca12(PO4)6(OH)2

    Ca10(PO5)5(OH)2

    Ca8(PO5)2(OH)2

    Ca10(PO4)6(OH)2
    Ca10(PO4)6(OH)2
  9. The crystalline structural unit of enamel, is cylindrical in longitudinal section with an average diameter of: 

    25 microns
    4 microns
    0.25 millimeter
    1 micron
    4 microns
  10. Demineralization of the enamel occurs when the oral pH is less than: 

    5.5
    6.0
    6.5
    7.0
    5.5
  11. In the fissures on the occlusal surfaces of  teeth, the rods of the enamel are oriented so their positon is approximately:

    Parallel to the DEJ

    Perpendicualr to the walls of the fissure

    Perpendicular to the DEJ

    Circular, around the curvature of the fissure and parallel to its exposed surface
    Perpendicualr to the walls of the fissure
  12. Match the following terms with their  descriptors:

    Lines of Retzius
    perikymata
    neonatal line
    imbrication lines

    accentuated increment lines in enamel due to trauma of birth

    incremental lines associated with the cyclical secretion of enamel

    the raised scale like pattern of the outer enamel layer

    the grooves between the scale like of the outer enamel layer
    incremental lines associated with the cyclical secretion of enamel

    the grooves between the scale like of the outer enamel layer

    accentuated increment lines in enamel due to trauma of birth

    the raised scale like pattern of the outer enamel layer
  13. In the following microscopic view of a transverse section of tooth enamel, the white arrow is indicating what feature of mature enamel _____ ?

    The black arrow is pointing to what other feature of mature enamel ___ ?
     (figure 12-11 in text)
    • enamel tufts
    • enamel Lamella
  14. The Hunter-Schreger light to dark bands seen in certain sections of enamel, as seen under a microscope by reflected light, are a result of:
     
    Branching of dentinal tubles

    Enamel rods bending to the right or left at a slightly different angle to adjacent enamel rod groups

    A nutritional deficiency during the period of tooth development

    Hypercalcification of the interprismatic region between the enamel rods
    Enamel rods bending to the right or left at a slightly different angle to adjacent enamel rod groups
  15. [Blank] is the loss of enamel due to tooth to tooth contact associated with mastication or parafunctional habits.
    attrition
  16. Enamel lost through
    demineralization/decalcification caused by the waste products of cariogenic bacteria, is defined as [Blank].
    caries
  17. [Blank] is the loss of enamel caused by excessive contact with some sort of non-tooth structure such as a  toothbrush, abrasive toothpaste, or hair/bobby pins.
    abrasion
  18. Enamel lost in deep narrow "V" shaped notches in the cervical areas of a tooth or teeth, as a result of excessive tensile and compressive forces associated with
    parafunctional habits is defined as [Blank].
    abfraction
  19. When enamel is lost through chemical means (usually acid, not involving bacteria) this condition is defined as [Blank].
    erosion
  20. Acid etching is a dental procedure intended to chemicaly remove organic portions in the interprismatic regions of enamel to open gaps for sealant material to flow into and adhere to the tooth surface with a [Blank] attachment or bond.
    microscopic mechanical
  21. The area of tooth enamel where most stain collects and therefore is the area where whitening or bleaching of the teeth is most active is the:

    Enamel rods
    Interprismatic regions
    Perikymata
    Enamel spindles
    Interprismatic regions
  22. MORE THAN ONE ANSWER

    The use of systemic and topical fluorides contribute to the increased caries resistance of tooth enamel by which of the following actions:

    Covering the deepened pit and groove patterns on the occlusal surfaces of teeth

    Altering the morphology of teeth

    Directly remineralizing enamel

    Interferring with the microbial production of acids
    • Altering the morphology of teeth
    • Directly remineralizing enamel
    • Interferring with the microbial production of acids
  23. Why should dental care NOT be based upon perceptions of dental pain?

    Furthermore, what armamentatium should dental professionals employ in their attempts to both prevent and diagnose dental caries?
    • If you have caries in only the enamel it doesn't cause pain because the enamel has no nerves within it.  The pain only occurs when the deep layers of dentin and the pulp
    • tissue are involved.  The dental professional should emphasize the importance of follow up visits due to the above reason.  Decay can be
    • caught early before the pain develops and more damage is done.

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