Table 1.

Mean dimensional changes (µ) in open- tray and closed- tray methods

Methods	Open Tray	Closed Tray	P.value
Groups
A (n=31)	143 ± 41.7	123 ± 35.1	p< 0.02
B (n=31)	144 ± 42.6	129 ± 35.5	p< 0.07
C (n=31)	143 ± 44.4	128 ± 38.1	p< 0.09
D (n=31)	145 ± 46	131 ± 36.6	p< 0.2
E (n=31)	142 ± 44.6	132 ± 38.9	p< 0.2
F (n=31)	144 ± 42.7	131 ± 38.2	p< 0.2