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Table 1 Comparison of pain variable in the three surgical techniques

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

Paired t test (P value) Conventional rotary instrument Laser Piezosurgery Pain
S.D Mean S.D Mean S.D Mean
  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