Table 4.
Summary of studies characteristics and results of the included studies assessing OBB.
| Reference | Sample | Outcomesa | Results | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Baseline G1 | ΔG1b | Baseline G2 | ΔG2b | ΔG1 − ΔG2 | P-valuec | ||||
| Group 1 | Group 2 | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | ||||
| Defraia et al. (14) | OBB | Untreated | Overbite (mm) | NA | 2.7 (2.6) | NA | 1.2 (2.0) | 1.5 | P < 0.05 |
| n = 24 | n = 23 | MPA (°) | −1.1 (3.2) | −0.3 (1.4) | −0.8 | NS | |||
| 13♀/11♂ | 10♀/13♂ | FH.PP (°) | 0.2 (2.7) | −1.0 (1.7) | 1.2 | NS | |||
| 9.2 yrs | 9.1 yrs | PP.MP (°) | −1.2 (1.8) | 0.7 (2.7) | −1.9 | P < 0.05 | |||
| OP: 33 months | |||||||||
| Cozza et al. (12) | OBB | QH-Crib | Overbite (mm)1 | NA | 2.7 (2.6) | NA | 4.6 (2.1) | −1.9 | P < 0.05 |
| n = 20 | n = 21 | MPA (°) | −1.1 (3.2) | −0.9 (1.9) | −0.2 | NS | |||
| 9♀/11♂ | 15♀/6♂ | FH.PP (°) | 0.2 (2.7) | 1.1 (2.2) | −0.9 | NS | |||
| 8.3±0.8 yrs | 8.4±1.2 yrs | PP.MP (°) | −1.2 (1.8) | −2.0 (2.4) | 0.8 | NS | |||
| OP: 30 months | OP: 31 months | ||||||||
| Freeman et al. (15) | OBB + HPH | Untreated | Overbite (mm) | 1.3 (3.2) | 1.0 (2.7) | 0.9 (3.2) | 1.2 (2.0) | −0.2 | NS |
| n = 24 | n = 23 | MPA (°) | 30.1 (4.5) | 0.3 (1.5) | 29.4 (3.0) | −0.3 (1.4) | 0.6 | NS | |
| 13♀/11♂ | 13♀/10♂ | FH.PP (°) | 1.9 (3.4) | −1.9 (2.1) | 1.5 (2.6) | −1.0 (1.7) | −0.9 | NS | |
| 8.7±1.1 yrs | 8.2±1.0 yrs | ||||||||
| OP: 40 months | OP: 33 months | ||||||||
| Weinbach and Smith (37) | OBB + HPH | OBB | Overbite (mm) | NA | 2.0 (2.6) | NA | 1.0 (2.5) | 1.0 | NS |
| n = 13 | n = 26 | SN.PP (°) | 0.4 (1.9) | 0.2 (2.1) | 0.2 | NS | |||
| 12♀/27♂ | SN.MP (°) | −0.8 (2.1) | −0.5 (2.0) | −0.3 | NS | ||||
| 10 (7.0–12.9) yrs | NSGn (°) | −0.5 (1.4) | −0.2 (1.4) | −0.3 | NS | ||||
| OP: 20 months | |||||||||
SD, standard-deviation; ♀, female; ♂, male; yrs, years; G1, group 1; G2, group 2; NS, non-significant; OP, observation period; NA, not available; HPH, high-pull headgear; QH-Crib, quad-helix associated with crib; OBB, open bite bionator; ΔG1, difference between final and baseline measurements for group 1; ΔG2, difference between final and baseline measurements for group 2; ΔG1 − ΔG2, difference between changes observed for groups 1 and 2.
aPre-treatment statistically significant (P < 0.05) differences on bold font, and absence of pre-treatment comparison on italic font.
bStatistically significant (P < 0.05) changes on bold font, and absence of intra-group comparison on italic font.
cConcerning ΔG1 − ΔG2.