Table 2 Positional changes in the distal segments after IVRO and positional changes in the distal segments according to setback magnitude.
From: Anterior relapse or posterior drift after intraoral vertical ramus osteotomy
All cases (n = 62) | |||||
|---|---|---|---|---|---|
Immediately after IVRO | 1 month postoperatively | 3 months postoperatively | 6 months postoperatively | 1 year postoperatively | |
Average | 0 | 2.6 | 3.2 | 3.2 | 2.1 |
SD | 3.7 | 2.9 | 3.0 | 3.0 | |
P-value | 2.7 × 10−5** | 6.9 × 10−10** | 6.2 × 10−9** | 9.7 × 10−5** | |
0 to ≤ 3 mm (n = 14) | |||||
Average | 0 | 1.8 | 3.5 | 4.8 | 3.3 |
SD | 2.0 | 2.9 | 3.3 | 2.1 | |
P-value | 7.8 × 10−3** | 6.6 × 10−5** | 5.8 × 10−4** | 5.4 × 10−4** | |
3 to ≤ 6 mm (n = 16) | |||||
Average | 0 | 4.0 | 5.5 | 3.7 | 2.1 |
SD | 4.0 | 2.1 | 2.5 | 2.1 | |
P-value | 2.0 × 10−2* | 6.2 × 10−6** | 2.1 × 10−3** | 2.4 × 10−2* | |
6 to ≤ 9 mm (n = 22) | |||||
Average | 0 | 3.6 | 3.3 | 3.2 | 1.9 |
SD | 5.1 | 3.2 | 2.4 | 1.7 | |
P-value | 6.0 × 10−2 | 4.1 × 10−3** | 2.1 × 10−3** | 2.4 × 10−2* | |
>9 mm (n = 10) | |||||
Average | 0 | 0.6 | 0.4 | 0.7 | −0.2 |
SD | 2.6 | 2.2 | 1.6 | 2 | |
P-value | 0.51 | 0.71 | 0.25 | 0.87 | |
