Table 2 Comparison of surgical working time and mouth opening (mm) at baseline and day 3 between and within groups
|  | Group 1 n = 20 | Group 2 n = 20 | Group 3 n = 20 | Group 4 n = 20 | p value |
|---|---|---|---|---|---|
Surgical Working time | 15.9 ± 3.6 | 15.7 ± 3.5 | 23.2 ± 2.6 | 23.4 ± 2.5 | < 0.0001 |
Mouth opening (mm) | Â | Â | Â | Â | Â |
 Preoperative | 44.9 ± 6.5 | 45.4 ± 6.8 | 45.5 ± 5.9 | 45.1 ± 6.7 | 0.992 |
 Post-op Day 3 | 35.0 ± 5.2 | 39.4 ± 6.3 | 39.8 ± 5.5 | 40.8 ± 4.2 | 0.016 |
 Difference (Post-op Day 3 to preoperative) | 9.7 ± 4.5 | 5.6 ± 4.3 | 5.8 ± 4.5 | 5.0 ± 3.9 | 0.005 |
 pvalue | < 0.0001 | < 0.0001 | < 0.0001 | < 0.0001 |  |