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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. 397 - Implants
Locator retention: does variation in number and configuration matter?

Self-Instruction Exercise No. 397
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Exercise No. 397
Subject Code: 690

The 15 questions for this exercise are based on the article Locator retention: does variation in number and configuration matter? on pages 37-40. This exercise was developed by Kim Capehart, DDS, MBA, PhD(c), in association with the General Dentistry Self-Instruction Committee.

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

  • understand the effects of resilient attachments for implant-retained mandibular overdentures;
  • recognize the importance of using implant-retained overdentures; and
  • learn the retentive strengths that result from variations in the number of implants and attachments.

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

  1. The number of patients with at least 1 edentulous arch is expected to reach 38 million by ________.

    A. 2018
    B. 2020
    C. 2022
    D. 2024

  2. What is the minimum number of implants needed in the mandibular arch to maintain the standard of care for edentulous patients?

    A. 1
    B. 2
    C. 3
    D. 4

  3. Implant-retained complete dentures are not recognized by third-party payers. However, the number of patients choosing this prosthetic is increasing.

    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.

  4. The load rate on the mandibular denture over the resilient attachments was ____ mm/min.

    A. 45.8
    B. 50.8
    C. 55.8
    D. 60.8

  5. Prior to testing, the Locators were soaked in _________ for 24 hours.

    A. deionized water
    B. chlorhexidine
    C. glutaraldehyde
    D. ethanol

  6. Absolute retentive strength and percent decrease in retentive strength were analyzed using _________ models.

    A. multilevel
    B. random effects
    C. fixed effects
    D. linear mixed

  7. The statistical model used to select the most appropriate covariance structure was the __________ information criterion.

    A. Akaike
    B. deviance
    C. focused
    D. Hannan-Quinn

  8. The mean retentive strength stabilized after the ______ pull for all 4 configurations.

    A. 5th
    B. 7th
    C. 9th
    D. 11th

  9. Which configuration had the highest retentive strength after 20 pulls?

    A. T1-6
    B. T1346
    C. T2345
    D. T25

  10. All of the following pairs of configurations showed significant differences in overall retentive strength except one. Which is the exception?

    A. T1-6; T1346
    B. T1346; T2345
    C. T2345; T25
    D. T25; T1-6

  11. On average, all configurations lost between ____% and ____% of their original retentive strength after the 2nd pull.

    A. 2; 5
    B. 6; 9
    C. 10; 13
    D. 14; 17

  12. Which configuration exhibited the smallest overall percent decline in retentive strength?

    A. T1-6
    B. T1346
    C. T2345
    D. T25

  13. Configuration T1346 exhibited the greatest overall percent decrease in retentive strength at ____%.

    A. 17.3
    B. 22.3
    C. 27.3
    D. 32.3

  14. A force of ____ N is needed to remove an implant-retained complete removable dental prosthesis that has 6 Locators.

    A. 476
    B. 576
    C. 676
    D. 776

  15. What was the retentive strength of T25 on the 20th pull?

    A. 179.9
    B. 189.9
    C. 199.9
    D. 209.9


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