Comparative study of the fluorescence intensity of dental composites and human teeth submitted to artificial aging

Self-Instruction Exercise No. 343
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Exercise No. 343
Subject Code: 017
Dental Materials

The 15 questions for this exercise are based on the article, Comparative study of the fluorescence intensity of dental composites and human teeth submitted to artificial aging, on pages 37-41. This exercise was developed by Daniel S. Geare, DMD, in association with the General Dentistry Self-Instruction committee.

Reading the article and successfully completing the exercise will enable you to understand:

  • how artificial aging affects composite fluorescence;
  • the difference in fluorescence between composite brands; and
  • the physical nature of fluorescence.

Answers for this exercise must be received by December 31, 2014.
  1. Fluorescence is defined as the

    A. reflection of visible light.
    B. absorption of UV light.
    C. absorption of visible light.
    D. reflection of UV light.

  2. Natural teeth appear whiter in the daylight due to light in the _____________ spectrum.

    A. red
    B. yellow
    C. green
    D. blue

  3. Fluorescence is achieved in porcelains by incorporating _____________ that has/have fluorescent properties.

    A. oxides
    B. alumina
    C. silicones
    D. glass

  4. Thermocycling is a technique that utilizes UV light and variable temperatures. Accelerated aging utilizes successive water immersion at variable temperatures.

    A. Both statements are true.
    B. The first statement is true; the second is false.
    C. The first statement is false; the second is true.
    D. Both statements are false.

  5. The fluorescent intensity values used in this study were _____________ nm.

    A. 200-300
    B. 300-500
    C. 400-600
    D. 500-800

  6. The highest level of fluorescence of the tested materials included all of the following except one. Which is the exception?

    A. Esthet.X
    B. 4 Seasons
    C. Filtek
    D. Vit-l-escence

  7. The highest degradation of fluorescence occurred with which product after thermocycling?

    A. Charisma
    B. Opallis
    C. Durafil
    D. Esthet.X

  8. Water sorption and solubility of resins are a function of all of the following except one. Which is the exception?

    A. degree of polymerization
    B. composition of monomers
    C. size of filler particles
    D. mix of the oxides

  9. Fluorescence of natural teeth is primarily attributed to

    A. metallo-oxides.
    B. fluorides.
    C. organic matrices.
    D. hydroxyapatite.

  10. The composite that increased in fluorescence intensity after accelerated aging was

    A. Esthet.X.
    B. Vit-l-escence.
    C. Opallis.
    D. Filtek.

  11. One of the identified luminophores in composite resins is

    A. yttrium oxide.
    B. zinc orthosilicate.
    C. ytterbium trifluoride.
    D. ruthenium bipyridine.

  12. The composite that showed fluorescence most similar to teeth was

    A. Opallis.
    B. Esthet.X.
    C. Vit-l-escence.
    D. Charisma.

  13. Thermocycling was performed at _______ cycles/______°C.

    A. 400/55
    B. 2000/5
    C. 2000/24
    D. 4500/5

  14. The fluorescence intensity measure in untested natural teeth was _______nm.

    A. 489.25
    B. 376.08
    C. 254.43
    D. 232.99

  15. After thermocycling, the material that maintained the highest level of fluorescence was

    A. Esthet.X.
    B. Vit-l-escence.
    C. Charisma.
    D. Filtek.

Evaluation
Please respond to the statements below, using the following scale:
1 Poor; 2 Below average; 3 Average; 4 Above average; 5 Excellent
Practicality of the content 1 2 3 4 5
Benefit to your clinical practice 1 2 3 4 5
Quality of illustrations 1 2 3 4 5
Clarity of objectives 1 2 3 4 5
Clarity of exercise questions 1 2 3 4 5
Relevance of exercise questions 1 2 3 4 5
 
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