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Participants must answer at least 12 of 15 questions correctly (80%) to earn CE credit.

Note: Exercise 994 is a special edition of the Self-Instruction Exercises and is only available to those members/nonmembers who attended the 2017 Scientific Session in Las Vegas. If you submit exercise 994 but did not attend the Scientific Session, the exercise will not be processed and your payment will be returned.

AGD - Self-Instruction Exercise No. 398 - All Ceramic Crowns
Translucency and strength of high-translucency monolithic zirconium oxide materials

Self-Instruction Exercise No. 398
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Exercise No. 398
Subject Code: 784
All Ceramic Crowns

The 15 questions for this exercise are based on the article Translucency and strength of high-translucency monolithic zirconium oxide materials on pages 48-52. This exercise was developed by Charles Martello, DDS, MAGD, in association with the General Dentistry Self-Instruction Committee.

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

  • understand the determinants controlling esthetics in ceramic materials;
  • identify the inherent factors needed to deliver long-lasting restorations; and
  • recognize which ceramic system will address the ever-increasing esthetic demand for metal-free dentistry.

Answers for this exercise must be received by December 31, 2017.

  1. Which material exhibited significantly greater translucency at each evaluated thickness?

    A. inCoris TZI C
    B. BruxZir HT
    C. IPS e.max CAD HT
    D. Lava Plus

  2. In what year was the all-ceramic crown developed?

    A. 1886
    B. 1902
    C. 1974
    D. 2003

  3. Which of the following is a purely crystalline material?

    A. leucite
    B. feldspathic porcelain
    C. lithium disilicate
    D. alumina

  4. All of the following will decrease the fracture incidence of the veneered zirconium oxide crown except one. Which is the exception?

    A. nightguard appliance
    B. comparable thermal coefficients
    C. occlusal overloading
    D. adequate core design

  5. Kim et al concluded the yttria-stabilized tetragonal zirconia polycrystalline ceramic material can be made more translucent by ________________.

    A. varying production temperature
    B. decreasing sintering time
    C. increasing grain size
    D. color shading subsequent to heating

  6. BruxZir Shaded 16 is a series of zirconia blanks that _______________.

    A. match the VITA Classical shades
    B. require dipping and staining
    C. exhibit translucent pearlesence
    D. are preshaded layered zirconia

  7. Which material contains less aluminum, thus reportedly reducing light scattering and improving translucency?

    A. BruxZir Shaded 16
    B. Lava Plus
    C. BruxZir HT
    D. inCoris TZI C

  8. The objective of this study was to evaluate all of the following except one. Which is the exception?

    A. opacity range
    B. flexural modulus
    C. translucency parameter
    D. flexural strength

  9. BruxZir Shaded 16, inCoris TZI C, and IPS e.max CAD HT blocks were immersed in an A2 dye solution. Lava Plus specimens were placed in a Lava Plus zirconia dyeing liquid shade (A2) after sintering.

    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.

  10. A pilot study was conducted to determine initial specimen ___________.

    A. translucency
    B. flexural strength
    C. thickness
    D. opacity

  11. The beam specimens employed had a final length of ___ mm and width of ___ mm.

    A. 15.0; 4.0
    B. 13.0; 5.0
    C. 11.0; 6.0
    D. 9.0; 7.0

  12. Which of the following tested materials had a significantly lower flexural modulus?

    A. BruxZir HT
    B. inCoris TZI C
    C. BruxZir Shaded 16
    D. Lava Plus

  13. An esthetic restoration must mimic the transition between the higher _______ of dentin and the relative ________ of enamel.

    A. transparency; translucency
    B. opacity; translucency
    C. translucency; transparency
    D. transparency; opacity

  14. _______________ contributes to the relatively opaque nature of a zirconia restoration.

    A. Noncrystalline composition
    B. Size of the glass particles
    C. Greater light scattering
    D. Increased translucency

  15. Why has the clinical use of zirconia restorative materials greatly escalated in recent years compared to use of other ceramic materials?

    A. superior strength
    B. lower flexural moduli
    C. suspect laboratory marketing
    D. outstanding esthetics


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
Did this exercise achieve its objectives? Yes No
Did this article present new information? Yes No
How much time did it take you to complete this exercise? mins