RAPID EXPANSION
SLOW EXPANSION •
Results in major change occuring in basal structures of mandible and maxilla
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More than 5 ounces
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By use of this force the teeth alone are supposed to move
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Slow expanders like Quad Helix & W-Spring can transmit forces ranging from several ounces to 2 pounds.
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They can separate maxillae, particularly in the deciduous & mixed dentitions. Rate of separation varies from 0.4 to 1.1 mm / week • Intermolar width – 8mm • Requires 2 – 6 mons Skeletal changes – • 16 – 30% of total change and vary with age •
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Rate of separation varies from 0.2 to 0.5 mm / day Intermolar width – 10mm Requires 1- 4 weeks Skeletal changes – 50%
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