Polysomnographic analysis of bruxism

Self-Instruction Exercise No. 344
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Exercise No. 344
Subject Code: 737
Physical Evaluation

The 15 questions for this exercise are based on the article, Polysomnographic analysis of bruxism, on pages 56-60. This exercise was developed by Gustav Gates, DDS, MAGD, in association with the General Dentistry Self-Instruction committee.

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

  • define bruxism;
  • understand the use of polysonography in identifying bruxism; and
  • recognize the relationship of bruxism and sleep disorders.

Answers for this exercise must be received by December 31, 2014.
  1. The prevalence of bruxism in adults <59 years of age is ____%.

    A. 3
    B. 8
    C. 13
    D. 18

  2. Polysomnography uses all of the following muscles to identify sleep bruxism except one. Which is the exception?

    A. mentalis
    B. masseter
    C. buccinator
    D. temporalis

  3. According to Lavigne & Manzini, all of the following could be used to classify a patient with sleep bruxism except one. Which is the exception?

    A. history of grinding
    B. broken, unrestored tooth
    C. headaches in the temporal region
    D. difficulty opening mouth in the morning

  4. In this study, polysomnography confirmed the diagnosis of bruxism in ____ individuals.

    A. 4
    B. 6
    C. 8
    D. 12

  5. The PSGB group was awake _____ minutes more during the night than the non-PSGB group.

    A. 9.71
    B. 12.37
    C. 19.75
    D. 26.41

  6. Prior to initiating the polysomnography exam, the calibration of muscles is based on the maximal voluntary clenching of the teeth for _____ seconds.

    A. 15
    B. 45
    C. 60
    D. 75

  7. During which stage of sleep does bruxism predominately occur?

    A. REM
    B. NREM 1
    C. NREM 2
    D. NREM 3

  8. The REM stage accounts for approximately ____% of sleep.

    A. 10-15
    B. 20-25
    C. 30-35
    D. 40-45

  9. Total leg movement in relation to total sleep time for the PSGB was more than the non-PSGB in the REM phase. This contradicts the findings of Kato & Blanchet regarding bruxing and restless leg syndrome.

    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. It has been suggested that grinding in the ______ phase of sleep has the greatest destructive potential on the teeth.

    A. REM
    B. NREM 1
    C. NREM 2
    D. NREM 3

  11. The non-PSGB group had a mean leg movement index of _____ in REM sleep.

    A. 8.42
    B. 10.30
    C. 12.75
    D. 21.36

  12. Sleep bruxism is _____ times more frequent among smokers and individuals who use substances that affect the central nervous system.

    A. 0.7
    B. 1.9
    C. 2.8
    D. 3.2

  13. The frequency of the rhythmic mandibular movements during sleep is _______ times greater in individuals with bruxism than non-bruxers.

    A. 2
    B. 3
    C. 4
    D. 5

  14. Sleep bruxism may be accompanied by all of the following secondary risk factors except one. Which is the execption?

    A. gingival hyperplasia
    B. tooth decay
    C. occlusal trauma
    D. limited mandibular movement

  15. Twenty-five percent of children exhibit bruxism. 10% of adults >60 show signs of bruxism.

    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.

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

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