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Table 1 Treatment time for bonded maxillary expansion and U-bow activator therapy

From: Early treatment of posterior crossbite - a randomised clinical trial

Time(weeks)

Therapy

Total(n= 31)

Mean(SD)

Bonded hyrax

16.2 (0.6)

 

expansion period (n = 31)

3.2 (1.2)

 

retention period (n = 31)

12.6 (1.8)

U-bow activator

36.8 (5.4)

 

expansion period (n = 3)

5.9 (3.5)

 

retention period (n = 31)

36.1 (5.5)