Extraoral low-level laser therapy can decrease pain but not edema and trismus after surgical extraction of impacted mandibular third molars: a randomized, placebo-controlled clinical trial

Table 2 Mean amount of mouth opening in the two groups at different time points

Time	Laser		Placebo		P value
Time	Std. deviation	Mean	Std. deviation	Mean	P value
Before surgery	0.27	5.15	0.34	5.01	0.618
Immediately after surgery	0.18	4.78	0.44	4.59	0.510
After 2 days	0.16	3.94	0.25	3.22	0.011
After 7 days	0.18	4.67	0.14	4.09	0.027

ISSN: 1472-6831