Cephalometric analysis of surgical changes (T1-T0) of the MR group and LR group
| Measurements | MR group | LR group | Sig. | ||
|---|---|---|---|---|---|
| Mean | SD | Mean | SD | ||
| Mandibular anterior and posterior measurements | |||||
| S-perp to Pog (mm) | –11.58 | 3.20 | –10.43 | 4.36 | NS |
| S-perp to Me (mm) | –12.19 | 3.46 | –10.60 | 4.94 | NS |
| Mn body length (mm) | –7.04 | 4.75 | –7.75 | 4.18 | NS |
| SNB (°) | –5.91 | 1.29 | –4.99 | 1.66 | NS |
| AB to Mn plane angle (°) | 12.67 | 2.42 | 9.04 | 2.67 | 0.002 |
| Angular measurements | |||||
| Articular angle (°) | 4.36 | 3.88 | 1.52 | 1.80 | 0.026 |
| Gonial angle (°) | –1.94 | 6.18 | 1.94 | 5.20 | NS |
| FMA (°) | 2.36 | 3.23 | 3.38 | 4.83 | NS |
| Vertical measurements | |||||
| FH to Pog (mm) | –0.02 | 2.69 | 1.59 | 2.47 | NS |
| FH to Me (mm) | 0.16 | 2.37 | –0.86 | 2.16 | NS |
| Post. facial height (mm) | –0.31 | 2.29 | –0.44 | 4.49 | NS |
| Ant. facial height (mm) | –0.29 | 2.13 | 0.94 | 2.30 | NS |
| Dental measurements | |||||
| U1 to FH (°) | –0.72 | 1.81 | –1.46 | 3.57 | NS |
| IMPA (°) | –2.83 | 4.74 | –1.81 | 3.06 | NS |
| FH to U occlusal plane (°) | 0.07 | 1.45 | –0.06 | 2.11 | NS |
| FH to L occlusal plane (°) | 2.73 | 6.52 | 2.37 | 6.31 | NS |
| FH to U1 (mm) | 0.02 | 0.84 | 0.46 | 1.31 | NS |
| FH to U6 (mm) | –0.04 | 0.91 | 0.50 | 1.02 | NS |
(T1: 1 month after surgery, T0: presurgical, MR: more relapsed, LR: less relapsed, SD: standard deviation, FH: Frankfort horizontal, Sig.: significant in the independent t -test, NS: not significant, S-perp: a line perpendiculat to FH plane through Sella, FMA: Frankfort-mandibular plane angle, Post.: posterior, Ant.: anterior, IMPA: incisor mandibular plane angle)