Table 1.

Mean and standard deviations, in percentage, of newly formed bone in cranial vault defects, in rats, following polypropylene barrier positioning, according to the guided regeneration technique used and time

Technique	Time (days)		Mean
	30	90
Control	5.0 (1.2)	17.9 (1.1)	11.5 (6.9) A
Without coaptation	4.3 (1.3)	20.3 (1.7)	12.3 (8.6) A
With coaptation	9.7 (3.8)	34.0 (6.0)	21.9 (13.7) B
Mean	6.3 (3.3) a	24.1 (8.1) b	–

SD in brackets. Means followed by different upper case letters indicate a significant difference between techniques, regardless of time. Mean followed by different lowercase letters indicate a significant difference between times, regardless of technique. SD – Standard deviation