Question 158 · LDEK · Fixed appliances
Which of the following statements concerning Quad-Helix appliance is true?
1) the appliance is cemented on the upper first premolars and upper first permanent molars;
2) orthopedic and orthodontic effects are exerted in early mixed dentition;
3) the appliance consists of four helices;
4) the outer arms extend to the palatal surfaces of the upper incisors;
5) dental arch can be expanded asymmetrically.
The correct answer is:
2) orthopedic and orthodontic effects are exerted in early mixed dentition;
3) the appliance consists of four helices;
4) the outer arms extend to the palatal surfaces of the upper incisors;
5) dental arch can be expanded asymmetrically.
The correct answer is:
- A. 1,2,3.
- B. 1,2,4.
- C. 1,2,5.
- D. 2,3,4.
- E. 2,3,5.
Hint
Check where the bands are placed, how many helices the appliance has and how far its outer arms reach.
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