Table 2. Most commonly used retention appliance according to type of malocclusion (prevalence (P) n (%) and years of clinical experience (E) of orthodontists (median (interquartile range)).
| Maxilla | Mandible | |||||
|---|---|---|---|---|---|---|
| Bonded | Removable | Combination | Bonded | Removable | Combination | |
| Extraction | P 8 (8.7%)a E 2.5 (0.25-8.5) |
33 (35.9%)b 9 (3-19.5) |
51 (55.4%)b 7 (3-14) |
17 (18.5%)a 9 (4.5-17.5) |
30 (32.6%)ab 4.5 (0.75-21) |
45 (48.9%)b 7 (3-10.5) |
| Spacing | P 23 (25%)a E 8 (1-19) |
25 (27.2%)ab 9 (1-21) |
44 (47.8%)b 5 (4-11.5) |
32 (34.8%)ab 8.5 (4-19) |
20 (21.7%)a 7 (0.25-23.75) |
40 (43.5%)b 5 (3.25-9) |
| Frontal expansion | P 5 (5.4%)a E 9 (5-14) |
54 (58.7%)b 7.5 (1-17.25) |
33 (35.9%)b 7 (4-16.5) |
16 (17.4%)a 10.5 (5.5-18.25) |
40 (43.5%)b 7.5 (1.25-17) |
36 (39.1%)b 4.5 (3-9.75) |
| Lateral expansion | P 1 (1.1%)a E 1 |
60 (65.2%)b 6.5 (1-15.5) |
31 (33.7%)c 7 (4-13) |
8 (8.7%)a 11.5 (7.25-18.25) |
55 (59.8%)b 5 (1-17) |
29 (31.5%)c 7 (3.5-13) |
| Impacted canines | P 15 (16.3%)a E 9 (2-20) |
44 (47.8%)b 7 (1-15.5) |
33 (35.9%)b 7 (4-13) |
24 (26.1%) 8.5 (5.5-19) |
41 (44.6%) 5 (1-18.5) |
27 (29.3%) 5 (3-9) |
| Rotated teeth | P 20 (21.7%)a E 9.5 (1-19.75)ab |
19 (20.7%)a 14 (5-26)b |
53 (57.6%)b 5 (3-9.5)a |
31 (33.7%)ab 8 (2-19)ab |
15 (16.3%)a 19 (4-27)b |
46 (50%)b 2.75 (4-9)a |
| Open bite | P 18 (19.6%)a E 8.5 (4-17.5) |
31 (33.7%)ab 9 (1-23) |
43 (46.7%)b 5 (3-12) |
27 (29.3%) 9 (5-19) |
23 (25%) 3 (1-24) |
42 (45.7%) 6 (3-12.5) |
*values that share the same superscript letters in each jaw do not differ significantly at p<0.05 according to χ2-test for prevalence (P) and Kruskal-Wallis and Mann-Whitney test with Bonferroni correction for years of clinical experience (E).