Table 2 Occlusal characteristics (overjet, increased overjet, overbite, anterior open bite, primary canine relationship, posterior crossbite) in all children according to group
From: Occlusal characteristics in 3-year-old children – results of a birth cohort study
All children n = 377 | Group I (norm) n = 44 | Group II (pacifier) n = 304 | Group III (thumb) n = 16 | Group IV (other) n = 13 | |
|---|---|---|---|---|---|
Overjet | |||||
Mean overjet ± SD (mm) | 2.4 ± 0.8 | 1.2 ± 0.2 | 2.6 ± 0.7 | 3.3 ± 0.4 | 1.3 ± 0.6 |
Increased overjet N (%) | 155 (41.2) | 0 (0.0) | 138 (45.4) | 16 (100.0) | 1 (7.7) |
Mean ± SD | 3.2 ± 0.3 | – | 3.2 ± 0.3 | 3.3 ± 0.4 | 3.6 ± 0.0 |
Overbite | |||||
Mean overbite ± SD (mm) | 0.8 ± 1.2 | 1.4 ± 0.2 | 0.8 ± 1.2 | −0.3 ± 2.1 | 1.3 ± 0.1 |
Anterior open bite N (%) | 41 (10.9) | 0 (0.0) | 35 (11.5) | 6 (37.5) | 0 (0.0) |
Mean ± SD | 2.2 ± 1.4 | – | 3.4 ± 1.9 | −2.6 ± 1.7 | – |
≤ \( {\scriptscriptstyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.} \) overlap N (%) | 212 (56.2) | 21 (47.7) | 174 (57.2) | 10 (62.5) | 7 (53.8) |
\( {\scriptscriptstyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$3$}\right.} \) to \( {\scriptscriptstyle \raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$3$}\right.} \) overlap N (%) | 123 (32.6) | 23 (52.3) | 95 (31.3) | 0 (0.0) | 5 (38.5) |
> \( {\scriptscriptstyle \raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$3$}\right.} \) overlap N (%) | 1 (0.3) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (7.7) |
Primary canine relationship | |||||
Class I N (%) | 223 (59.2) | 44 (100.0) | 162 (53.3) | 5 (31.2) | 12 (92.3) |
Class II N (%) | 154 (40.8) | 0 (0.0) | 142 (46.7) | 11 (68.8) | 1 (7.7) |
Class III N (%) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
Posterior crossbite | |||||
Unilateral N (%) | 13 (3.4) | 0 (0.0) | 12 (3.9) | 1 (6.2) | 0 (0.0) |
Bilateral N (%) | – | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |