pISSN 2234-7518
eISSN 2005-372X

Table. 2.

Comparison of dentoskeletal variables

Variable Group 1(n = 19) Group 2(n = 25) Group 3(n = 13) Group 4(n = 49) Group 5(n = 34) p-value
Horizontal skeletal relationships
Sella-Nasion-A point angle (°) 82.0 ± 2.8 81.6 ± 3.2 82.5 ± 3.6 81.5 ± 3.3 81.8 ± 3.0 0.742
Sella-Nasion-B point angle (°) 81.0 ± 4.0 76.6 ± 3.4 76.0 ± 3.4 73.7 ± 3.3 74.2 ± 4.1 < 0.001**
N-perpendicular to point A (mm) 1.7 ± 2.9 2.3 ± 3.3 2.7 ± 1.6 1.7 ± 3.4 2.0 ± 3.6 0.846
N-perpendicular to pogonion (mm) 1.2 ± 10.1 −6.1 ± 6.9 −9.9 ± 4.2 −14.6 ± 8.7 −14.0 ± 9.9 < 0.001**
A point-Nasion-B point angle (°) 1.0 ± 3.6 5.0 ± 2.7 6.6 ± 1.4 7.8 ± 2.6 7.6 ± 2.7 < 0.001**
Vertical skeletal relationships
Frankfort horizontal plane to mandibularplane angle (°) 27.4 ± 5.4 29.4 ± 6.3 33.9 ± 5.7 35.3 ± 6.3 36.2 ± 7.4 < 0.001**
Maxillomandibular plane angle (°) 27.1 ± 5.8 28.9 ± 5.9 34.0 ± 4.8 34.4 ± 6.0 35.8 ± 6.6 < 0.001**
Anterior facial height (mm) 138.4 ± 5.9 138.2 ± 5.6 138.4 ± 6.0 137.3 ± 6.2 137.9 ± 6.9 0.649
Posterior facial height (mm) 89.4 ± 6.7 86.9 ± 6.3 83.0 ± 6.2 80.5 ± 6.0 80.6 ± 6.7 < 0.001**
Facial height ratio (%) 64.7 ± 4.9 63.0 ± 4.7 60.0 ± 5.0 58.7 ± 4.0 58.5 ± 5.2 < 0.001**
Mandibular relationships
Ramus height (mm) 55.3 ± 5.5 51.5 ± 6.0 48.0 ± 4.9 46.5 ± 5.3 46.3 ± 5.4 < 0.001**
Ramus inclination (°) 94.4 ± 5.4 97.0 ± 5.2 98.3 ± 7.3 103.3 ± 5.8 101.0 ± 5.4 < 0.001**
Mandibular body length (mm) 82.0 ± 4.9 79.6 ± 4.5 78.1 ± 3.5 76.8 ± 5.6 75.9 ± 5.0 < 0.001**
Total mandibular body length (mm) 121.5 ± 7.0 116.2 ± 6.8 113.5 ± 3.7 109.2 ± 6.7 109.6 ± 5.8 < 0.001**
Mandibular body length ratio (%) 115.5 ± 7.4 111.8 ± 6.8 110.2 ± 6.7 108.2 ± 8.1 106.8 ± 7.7 0.002*
Gonial angle (°) 122.4 ± 7.1 122.7 ± 5.7 125.4 ± 7.5 122.0 ± 6.0 125.1 ± 6.4 0.178
Dental relationships
Maxillary incisor to Sella-Nasion plane (°) 110.1 ± 6.9 105.9 ± 9.3 106.3 ± 4.5 105.5 ± 9.1 106.0 ± 9.0 0.350
Maxillary incisor to Frankfort horizontalplane angle (°) 119.5 ± 6.7 116.2 ± 8.6 116.1 ± 4.5 115.4 ± 8.5 115.8 ± 8.6 0.306
Mandibular incisor to Frankfort horizontalplane angle (°) 62.2 ± 11.7 54.7 ± 7.0 52.6 ± 6.2 46.9 ± 7.6 47.1 ± 7.1 < 0.001**
Mandibular incisor to mandibular plane angle (°) 90.4 ± 11.8 95.9 ± 6.9 93.5 ± 6.5 97.8 ± 6.8 96.8 ± 5.9 0.001*
Interincisal angle (°) 122.7 ± 11.8 118.5 ± 13.2 116.5 ± 8.5 111.5 ± 10.1 111.2 ± 11.0 0.006*
Overbite (mm) 0.3 ± 1.3 −0.2 ± 3.5 −1.1 ± 3.4 −1.4 ± 3.6 −1.2 ± 3.6 0.407
Overjet (mm) 0.8 ± 2.5 4.8 ± 2.2 5.5 ± 2.0 6.6 ± 2.4 5.9 ± 2.9 < 0.001**

Values are presented as mean ± standard deviation.

Group 1, patients with bilateral normal disk positions; Group 2, patients with bilateral anterior disk displacement with reduction; Group 3, patients with bilateral rotational disk displacement with reduction; Group 4, patients with bilateral anterior disk displacement without reduction; Group 5, patients with bilateral rotational disk displacement without reduction.

The p-values were analyzed using the Kruskal–Wallis test at a significance level of p < 0.05.

*p < 0.05, **p < 0.001.

Korean J Orthod 2021;51:105~114 https://doi.org/10.4041/kjod.2021.51.2.105
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