Table 3.

Means, SDs of Coronal and Gingival Extraction Space Widths and Rate of Space Closure in the Lower Arch for the 2 Studied Groups at Different Time Intervals^a

	Group 1 (Healed)		Group 2 (Recent)
	Extraction Space Width/ Coronal, Mean (SD)	Extraction Space Width/ Gingival, Mean (SD)	Extraction Space Width/ Coronal, Mean (SD)	Extraction Space Width/ Gingival, Mean (SD)
Time point
T1	4.42 (1.39)	4.66 (1.46)	6.78 (0.81)	7.12 (0.84)
T2	3.79 (1.38)	4.16 (1.49)	5.26 (1.23)	5.74 (1.21)
T3	3.11 (1.32)	3.54 (1.39)	4.50 (1.19)	5.07 (1.25)
T4	2.44 (1.40)	2.91 (1.42)	3.75 (1.26)	4.44 (1.28)
Rate of space closure/mo
T1–T4	0.66 (0.16)	0.58 (0.17)	1.01 (0.41)	0.89 (0.08)

^aSD indicates standard deviation.