TABLE 1.
Comparison of mandibular displacement (T1–T0) in Herbst appliance and Comparison groups (t test and ANCOVAa). Cranial base superimposition.
| ROI | Coordinates | Groups | Mean | SD | Mean difference | CI 95% | T test P value | F Groups | F SNGoGn | |
|---|---|---|---|---|---|---|---|---|---|---|
| Pogonion | X | Herbst | −0.37 | 0.65 | −0.29 | −0.85 | 0.25 | .279 | 2.056 | 0.073 |
| Comparison | −0.08 | 0.46 | ||||||||
| Y | Herbst | 2.20 | 1.31 | 1.66 | 0.74 | 2.60 | .001** | 14.396** | 0.088 | |
| Comparison | 0.54 | 1.34 | ||||||||
| Z | Herbst | 2.37 | 1.60 | 0.90 | −0.21 | 2.03 | .110 | 2.134 | 1.897 | |
| Comparison | 1.47 | 1.64 | ||||||||
| 3D | Herbst | 3.68 | 1.55 | 1.46 | 0.42 | 2.49 | .007** | 8.052** | 1.833 | |
| Comparison | 2.22 | 0.43 | ||||||||
|
| ||||||||||
| Mandible | Pitch | Herbst | 0.06 | 0.60 | 0.35 | −0.20 | 0.90 | .207 | 1.853 | 0.926 |
| Comparison | −0.29 | 0.95 | ||||||||
Pitch is defined as clockwise and/or counterclockwise rotation in a lateral view.
Entries in bold highlight the comparison in which significant difference was found.
a
ANCOVA indicates analysis of covariance; SD, standard deviation; CI 95%, confidence interval of 95%; X, mesial-lateral; Y, anterior-posterior; Z superior-inferior; (+), rightward, forward, downward, clockwise rotation; (−), leftward, backward, upward, counterclockwise rotation.
*
P<.05;
**
P<.01.