Question 215 · LDEK · Fixed appliances
There are two methods of palatal expansion: RPE (rapid palatal expansion) and SPE (slow palatal expansion). Select answers correct for SPE:
1) it allows for activating the device at the rate of 0.5-1 mm a day;
2) it allows for activating the device at the rate of 1 mm a week;
3) active treatment lasts for about 3 months;
4) active treatment lasts for 2-3 weeks;
5) suture opening rate is more physiological, similar to the rate at which new bone is forming.
2) it allows for activating the device at the rate of 1 mm a week;
3) active treatment lasts for about 3 months;
4) active treatment lasts for 2-3 weeks;
5) suture opening rate is more physiological, similar to the rate at which new bone is forming.
- A. 1,4,5.
- B. 2,3,5.
- C. 2,4.
- D. 1,4.
- E. 1,3.
Hint
Compare the activation rate and duration of slow versus rapid protocols, and think whether bone formation in the suture can keep pace.
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