Methods: 23 randomly selected surgical-orthodontic patients’ pre-treatment, progress and post-surgical lateral cephalometric radiographs (without surgical splint) and the prediction tracings were selected from the OSU database. Cephalometric measurements of horizontal and vertical positions of upper and lower incisors and skeletal bases were made. The following landmarks were used: Upper and lower incisor tip and apex, point "B", porion, orbitale, gonion (Go), gnathion (Gn), Frankfort’s Horizontal (FH) and Vertical reference plane (Vert). Cephalometric points "A", anterior nasal spine and posterior nasal spine were not included, due to changes occurring during the surgical procedure. Pearson correlation coefficients (r), 95% confidence intervals (LCB.95, UCB.95), R2 and level of significance (p values) were calculated for the relation between each of the actual outcomes and the predictions as shown in the table.
Results:
|
Orthodontic Predictions |
Surgical Predictions |
|||||
|
Variables |
r |
LCB.95 |
UCB.95 |
r |
LCB.95 |
UCB.95 |
|
U1 to FH (°) |
0.84* |
0.63 |
0.92 |
0.86* |
0.67 |
0.93 |
|
U1 to VERT (mm) |
0.94* |
0.84 |
0.97 |
0.79* |
0.54 |
0.89 |
|
L1 to FH (°) |
0.84* |
0.63 |
0.92 |
0.86* |
0.68 |
0.93 |
|
L1 to VERT (mm) |
0.85* |
0.65 |
0.92 |
0.82* |
0.59 |
0.91 |
|
"B" PT to FH (mm) |
0.92* |
0.81 |
0.96 |
0.78* |
0.53 |
0.89 |
|
"B" PT to VERT (mm) |
0.95* |
0.88 |
0.98 |
0.85* |
0.65 |
0.92 |
|
GO-GN to VERT (°) |
0.98* |
0.94 |
0.99 |
0.89* |
0.74 |
0.95 |
* indicates p values <.0001
Conclusions: 1) Modest to strong agreement was found between the orthodontic predictions and outcomes. 2) Surgical predictions showed slightly lower correlation. 3) Cephalometric prediction of surgical-orthodontic treatment outcome is valid.