Table 3.

A comparison of monthly retraction rates of the two techniques

	PAS Mean (mm) ± SD	DS Mean (mm) ± SD	p value
T0–T1	0.53±0.26	0.66±0.28	0.050a
T1–T2	0.58±0.30	0.71±0.35	0.101a
T2–T3	0.44±0.20	0.72±0.39	0.000b**
Total	1.57±0.69	2.09±0.84	0.006a*

PAS power arm sliding, DS direct sliding

*p <0.05, **p <0.01

^aIndependent sample t-test

^bMann-Whitney U test