Question 69 · LDEK · Fixed appliances
Slow Palatal Expansion (SPE) device is activated at the rate of:
- A. 0.1-0.3 mm / day.
- B. 0.2-0.4 mm / day.
- C. 0.3-0.5 mm / day.
- D. 1.0 mm / week.
- E. 2.0 mm / week.
Hint
Slow expansion uses light forces over months; compare its weekly rate with the daily turns used in rapid expansion.
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