Table 3

Surface	Baseline	3 months	Gain in PH	P^a value	6 months	Gain in PH	P^a value
Mesial M (SD)	2.3 (0.48)	4.2 (0.91)	1.9 (0.87)	P = 0.005^b	3.8 (0.91)	1.5 (0.97)	P = 0.007^b
Distal M (SD)	2.3 (0.48)	4.3 (0.67)	2 (0.66)	P = 0.004^b	3.5 (0.70)	1.2 (0.78)	P = 0.01^b

^aTested between baseline and at 3 and 6 months.
^bSignificant, non-parametric Wilcoxon paired test.
M (SD) = mean (standard deviation).
PH = papillary height.