Effects of green tea on the shear bond strength of orthodontic brackets after in-office vital bleaching

Self-Instruction Exercise No. 387
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Exercise No. 387
Subject Code: 781
Tooth Whitening/Bleaching

The 15 questions for this exercise are based on the article, Effects of green tea on the shear bond strength of orthodontic brackets after in-office vital bleaching, on pages 72-75. This exercise was developed by Charles Martello, DDS, MAGD, in association with the General Dentistry Self-Instruction committee.

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

  • recognize the effects of hydrogen peroxide (HP) bleaching;
  • identify the method an antioxidant employs to neutralize HP; and
  • understand the clinical benefits of green tea (GT) as an antioxidant.

Answers for this exercise must be received by April 30, 2017.

  1. All of the following contributes to shear bond strength (SBS) of bleached enamel except one. Which is the exception?

    A. use of an antioxidant
    B. residual oxygen
    C. sufficient resin tags
    D. resin polymerization

  2. What is the minimum wait time (hours) between an in-office bleaching procedure and orthodontic bracket bonding?

    A. 4
    B. 8
    C. 12
    D. 24

  3. Application of GT immediately after bleaching will ____________________.

    A. decrease sensitivity
    B. restore SBS
    C. inhibit resin tags
    D. enhance peroxide concentration

  4. Sample size was determined using the data from the study by__________.

    A. Fernandes et al
    B. Haywood & Heymann
    C. Patusco et al
    D. Kimyai et al

  5. This study utilized 72 ____________.

    A. human incisors
    B. bovine molars
    C. human molars
    D. bovine incisors

  6. Tooth specimens were embedded __________ in standardized molds, and each ______ surface was pumiced.

    A. vertically; buccal
    B. horizontally; facial
    C. vertically; lingual
    D. horizontally; occlusal

  7. Which specimen groups received bleaching treatment to simulate in-office bleaching?

    A. 1-3
    B. 2-4
    C. 3-5
    D. 4-6

  8. Specimens in groups 3 and 4 were treated with an antioxidant for _____ minutes.

    A. 15
    B. 30
    C. 45
    D. 60

  9. Which adhesive remnant index (ARI) score is defined as “more than half of the adhesive left on the tooth”?

    A. 0
    B. 1
    C. 2
    D. 3

  10. Which statistical test was employed to compare the experimental groups to the negative and positive control groups?

    A. Tukey
    B. Kolmogorov-Smirnov
    C. Kruskal-Wallis
    D. Dunnett

  11. This study demonstrated the ability of GT to restore the SBS of bleached enamel to metallic brackets immediately after bleaching with 35% HP. The study hypothesis was rejected.

    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.

  12. Residual peroxide reduces SBS of an orthodontic bracket bonded to enamel by ______________.

    A. cultivating resin tags
    B. impeding polymerization
    C. creating calcium bridges
    D. decreasing phenolic concentration

  13. Which chemical reaction is involved in the bleaching process?

    A. redox
    B. addition
    C. condensation
    D. hydrolysis

  14. GT gel is processed from the _______of Camellia sinensis, which is rich in _________.

    A. stems; phenolic compounds
    B. buds; flavonoids
    C. branches; polyphenols
    D. leaves; ascorbates

  15. Which experimental group, prior to bracket placement, received bleaching and treatment with 10% GT?

    A. 3
    B. 4
    C. 5
    D. 6


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

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