Gingival biotype: a review

Self-Instruction Exercise No. 331
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Exercise No. 331
Subject Code: 490

The 15 questions for this exercise are based on the article, “Gingival biotype: a review.” This exercise was developed by Merlin P. Ohmer, DDS, FAGD, in association with the General Dentistry Self-Instruction committee.

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

  • the concept of gingival biotypes;
  • how gingival biotype influences restorative dentistry; and
  • how gingival biotype influences surgical procedures.

Answers for this exercise must be received by June 30, 2014.

  1. _____________ gingival biotypes are the most sensitive to dental procedures.

    A. Normal
    B. Thin
    C. Thick
    D. Compromised

  2. Gingival biotype may influence all of the following except one. Which is the exception?

    A. Periodontal therapy
    B. Root coverage procedure
    C. Composite resin restoration
    D. Implant placement

  3. Approximately 33% of the population has a thick biotype. Approximately 33% of the population has a thin biotype.

    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 thin biotype has no predilection for sex. The thick biotype has a predilection for sex.

    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. Which two teeth typically have the thinnest gingiva?

    A. Maxillary canines and mandibular canines
    B. Maxillary canines and mandibular first premolars
    C. Maxillary canines and maxillary first premolars
    D. Maxillary first premolars and mandibular first premolars

  6. The gingival margin is affected by the _________ of the crown.

    A. convexity
    B. concavity
    C. diameter
    D. arc

  7. In a healthy periodontium, the alveolar crest is approximately ______ mm apical to the CEJ.

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

  8. Where is the ideal location for crown margins in patients with thin biotypes?

    A. Supragingivally
    B. At the gingival margin
    C. Subgingivally
    D. Does not matter

  9. In patients with thin biotypes, buccal plate fracture is ___________.

    A. more common
    B. less common
    C. not a factor
    D. rare

  10. A study has shown a _________ relationship between biotype and thickness of the lining of the maxillary sinus.

    A. positive
    B. negative
    C. neutral
    D. non-

  11. One of the most common events following single anterior implant placement is _________.

    A. infection
    B. recession
    C. interproximal bone loss
    D. bone regeneration

  12. In root coverage surgeries, a flap thickness of ______ mm resulted in more predictable outcomes.

    A. 0.1-0.3
    B. 0.4-0.7
    C. 0.8-1.2
    D. 1.3-1.6

  13. A simple way to evaluate flap thickness prior to surgery is to _____________.

    A. blow air in the sulcus
    B. use a periodontal probe
    C. use a caliper
    D. employ visual assessment

  14. A thick biotype has a thickness of at least ______ mm.

    A. 0.75
    B. 1.00
    C. 1.25
    D. 1.50

  15. _______________ is considered just as reliable as CBCT in measuring gingival thickness.

    A. A caliper
    B. A periodontal probe
    C. A visual inspection
    D. Air blown in the sulcus


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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