Table 2.

Impact with cotton rolls

	Deep		Open
	Mean	SD	Mean	SD
Beginning of the treatment	4,258	451	3,971	380
Before surgical intervention 1	3,997	424	3,614	402
Before surgical intervention 2	4,100	583	3,702	390
After surgical intervention 1	2,100	284	2,082	367
After surgical intervention 2	2,702	250	2,641	300
End of the treatment	5,605	501	5,504	480

Values are expressed in microvolts.