Use of piezoelectric surgery and Er:YAG laser:which one is more effective during impacted third molar surgery?

Maxillofacial Plastic and Reconstructive Surgery

Table 1 Comparison of pain variable in the three surgical techniques

Paired t test (P value)	Conventional rotary instrument		Laser		Piezosurgery		Pain
Paired t test (P value)	S.D	Mean	S.D	Mean	S.D	Mean	Pain
	0	0	0	0	0	0	Before surgery
0.055	35.1	25.6	1.447	6.33	1.113	5.67	After surgery
0.531	37.2	5	1.352	3.40	1.082	3.20	Day 2 after surgery
0.546	99.2	41.3	0.704	1.07	0.704	0.93	Day 7 after surgery