Table 4. Mean differences, SD, SE and paired t-test for comparison between conventional and digital tracing.
Measurements | Conventional tracing |
Digital tracing |
Difference |
P-value | ||
(mean ± SD) | (mean ± SD) | Mean | SD | SE | ||
Angular (°) | ||||||
SNA | 78.3 ± 3.3 | 79.3 ± 3.6 | −1.0 | 1.4 | 0.3 | 0.0001*** |
SNB | 76.2 ± 3.6 | 77.4 ± 3.6 | −1.2 | 1.2 | 0.2 | 0.0001*** |
ANB | 2.1 ± 3.4 | 1.9 ± 3.2 | 0.2 | 1.4 | 0.2 | 0.5 |
Angle of convexity | 4.1 ± 6.0 | 4.5 ± 6.3 | −0.4 | 1.3 | 0.2 | 0.09 |
SN-MP | 41.8 ± 6.5 | 42.4 ± 6.3 | −0.6 | 1.0 | 0.2 | 0.002** |
SN-PP | 8.3 ± 3.9 | 7.4 ± 3.8 | 0.9 | 0.9 | 0.2 | 0.0001*** |
PP-MP | 34.6 ± 6.6 | 35.7 ± 6.5 | −1.1 | 1.3 | 0.2 | 0.0001*** |
Gonial angle | 131.6 ± 6.3 | 132.5 ± 7.0 | −0.9 | 1.5 | 0.3 | 0.003** |
1/-SN | 103.9 ± 7.4 | 104.5 ± 7.0 | −0.6 | 1.1 | 0.2 | 0.006** |
/1-MP | 84.7 ± 7.8 | 84.1 ± 7.9 | 0.6 | 1.1 | 0.2 | 0.005** |
Linear (mm) | ||||||
Anterior cranial base (N-S) | 70.3 ± 4.3 | 70.1 ± 4.5 | 0.2 | 1.4 | 0.2 | 0.3 |
Mandibular length (Go-Gn) | 77.7 ± 4.5 | 80.0 ± 4.8 | −2.3 | 1.7 | 0.3 | 0.0001*** |
Maxillary length (ANS-PNS) | 50.9 ± 3.6 | 49.8 ± 4.0 | 1.1 | 2.2 | 0.4 | 0.01* |
Co-ANS | 87.9 ± 4.8 | 85.0 ± 4.7 | 2.9 | 2.5 | 0.5 | 0.0001*** |
Co-Gn | 118.8 ± 6.8 | 116.5 ± 7.3 | 2.3 | 1.9 | 0.4 | 0.0001*** |
LAFH (ANS-Me) | 74.1 ± 7.5 | 74.0 ± 7.1 | 0.1 | 1.5 | 0.3 | 0.6 |
ANS, anterior nasal spine; Co, condylion; Gn, gnathion; Go, gonion; LAFH, lower anterior facial height; Me, menton; MP, mandibular plane; N, nasion; PNS, posterior nasal spine; PP, palatal plane; S, sella; SD, standard deviation; SE, standard error
* p < 0.05, ** p < 0.01, *** p < 0.001