Question 168 · LDEK · Functional appliances
Indicate the rules for the application of activators in distocclusions:
1) construction bite is taken;
2) upper labial bow is always active;
3) the guiding planes are created by removing acrylic from the anterior surface of lateral maxillary teeth and from the posterior side of mandibular teeth;
4) the guiding planes are created by removing acrylic from the posterior surface of maxillary teeth and in the mandible - from the anterior surface of lower lateral teeth;
5) labial bow is used only to remove tension created by the upper lip.
The correct answer is:
2) upper labial bow is always active;
3) the guiding planes are created by removing acrylic from the anterior surface of lateral maxillary teeth and from the posterior side of mandibular teeth;
4) the guiding planes are created by removing acrylic from the posterior surface of maxillary teeth and in the mandible - from the anterior surface of lower lateral teeth;
5) labial bow is used only to remove tension created by the upper lip.
The correct answer is:
- A. 1,2,3.
- B. 1,3.
- C. 1,4.
- D. 1,4,5.
- E. 1,2.
Hint
In Class II the upper buccal teeth should be guided distally and the lower ones mesially; decide which tooth surfaces the acrylic must contact.
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