Research Article
Prevalence of Orthodontic Treatment Need and Occlusal Traits in Schoolchildren
Table 4
Prevalence of occlusal variables in the total sample (
) (male = 322/female = 321).
| | Occlusal variables | Male (%) | Female (%) | Total (%) | 95% confidence interval |
| | Class I | 160 (49.7) | 259 (80.7) | 419 (65.2) | 61.52–68.88 | | Class I—incisal relationship 1 | 132 | 202 | 334 (51.9) | 9.7–14.9 | | Class I—incisal relationship 2 | 21 | 57 | 78 (12.1) | 0.1–1.3 | | Class I—incisal relationship 3 | 3 | 0 | 3 (0.4) | 0.17–1.5 | | Class I—edge to edge | 4 | 0 | 4 (0.6) | | | Class II | 116 (36) | 39 (12.1) | 155 (24.1) | 21.8–27.6 | | Class II division 1 | 94 | 34 | 128 (19.9) |
16.9–23.2 | | Class II division 2 | 22 | 5 | 27 (4.2) | 2.8–6 | | Class III | 46 (14.3) | 23 (7.2) | 69 (10.7) | 8.31–13.09 | | Class III subdivision | 9 (2.8) | 33 (10.3) | 42 (6.5) | 4.7–8.7 | | Overjet | | | | | | Overjet > 4 mm | 91 (28.3) | 55 (17.1) | 146 (22.7) | 19.5–26.1 | | Overjet 0–4 mm | 183 (56.8) | 248 (77.3) | 431 (67) | 63.3–70.7 | | Overjet < 0 mm | 31 (9.6) | 7 (2.2) | 38 (5.9) | 4.2–8 | | Edge to edge | 17 (5.3) | 11 (3.4) | 28 (4.4) | 2.9–6.2 | | Overbite | | | | | | Overbite > 4 mm | 11 (3.4) | 13 (4) | 249 (3.7) | 2.4–5.5 | | Overbite 0–4 mm | 195 (60.6) | 253 (78.8) | 448 (69.7) | 66–73.2 | | Overbite < 0 mm | 116 (36) | 55 (17.1) | 171 (26.6) | 23.2–30.2 | | Crossbite | | | | | | Unilateral posterior crossbite (left) | 26 (8.1) | 26 (8.1) | 52 (8.1) | 6.1–10.5 | | Unilateral posterior crossbite (right) | 21 (6.5) | 25 (7.8) | 46 (7.1) | 5.2–9.4 | | Bilateral posterior crossbite | 29 (9) | 19 (5.9) | 48 (7.5) | 5.6–9.8 | | None | 246 (76.4) | 251 (78.2) | 497 (77.3) | 73.9–80.5 | | Crowding | | | | | | Upper | 28 (8.7) | 20 (6.2) | 48 (7.5) | 5.6–9.8 | | Lower | 103 (32) | 104 (32.4) | 207 (32.2) | 28.5–36 | | Both | 72 (22.3) | 76 (23.7) | 148 (23) | 19.8–26.5 | | None | 119 (37) | 121 (37.7) | 240 (37.3) | 33.6–41.2 | | Lip competency | | | | | | Competent | 281 (87.3) | 261 (81.3) | 542 (84.3) | 81.5–87.1 | | Incompetent | 41 (12.7) | 60 (18.7) | 101 (15.7) | 12.9–18.6 | | TMD | | | | | | Present (yes) | 44 (13.7) | 37 (11.5) | 81 (13.0) | 10.4–15.6 | | Absent (no) | 278 (86.3) | 284 (88.5) |
562 (87) 87 (87.0) | 84.4–89.6 | | Diastema | | | | | | 0 mm | 272 (84.5) | 277 (86.3) | 549 (85.4) | 82.7–88.1 | | 2 mm | 19 (5.9) | 28 (8.7) | 47 (7.3) | 5.3–9.3 | | 3 mm | 21 (6.5) | 8 (2.5) | 29 (4.5) | 2.9–6.1 | | 4 mm | 5 (1.6) | 3 (0.9) | 8 (1.2) | 0.4–2 | | 5 mm | 5 (1.6) | 5 (1.6) | 10 (1.6) | 0.63–2.57 |
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