Table 2.
Comparison of Twin Block appliance and Herbst appliance in the treatment of Class II malocclusion in children
| Indicators | Outcomes | WMD (95% CI) | P | I2 |
|---|---|---|---|---|
| Maxillary skeletal changes | ||||
| SNA change | Hebst VS Twin Block | |||
| Overall | -0.19 (-0.48, 0.11) | 0.219 | 0.0 | |
| Sensitivity analysis | -0.19 (-0.48, 0.11) | |||
| Mandibular skeletal changes | ||||
| SNB change | Hebst VS Twin Block | |||
| Overall | 0.26 (-0.54, 1.07) | 0.524 | 90.5 | |
| Sensitivity analysis | 0.26 (-0.54, 1.07) | |||
| Go-Gn change | Hebst VS Twin Block | |||
| Overall | 1.44 (0.93, 1.96) | < 0.001 | 0.0 | |
| Sensitivity analysis | 1.44 (0.93, 1.96) | |||
| Co-Gn change | Hebst VS Twin Block | |||
| Overall | 0.16 (-0.88, 1.19) | 0.766 | 71.7 | |
| Sensitivity analysis | 0.16 (-0.88, 1.19) | |||
| Interdental | ||||
| Overjet change | Hebst VS Twin Block | |||
| Overall | 1.11 (-0.18, 2.41) | 0.091 | 81.2 | |
| Sensitivity analysis | 1.11 (-0.18, 2.41) | |||
| Overbite change | Hebst VS Twin Block | |||
| Overall | 0.13 (-0.42, 0.69) | 0.639 | 33.0 | |
| Sensitivity analysis | 0.13 (-0.42, 0.69) | |||
| Interincisal angle | Hebst VS Twin Block | |||
| Overall | -3.59 (-7.66, 0.49) | 0.085 | 0.0 | |
| Sensitivity analysis | -3.59 (-7.66, 0.49) | |||
| Molar relationship change | Hebst VS Twin Block | |||
| Overall | 0.79 (0.28, 1.29) | 0.002 | 0.0 | |
| Sensitivity analysis | 0.796 (0.28, 1.29) | |||
| Maxillary/Mandibular | ||||
| ANB change | Hebst VS Twin Block | |||
| Overall | -0.48 (-1.69, 0.74) | 0.442 | 95.8 | |
| Sensitivity analysis | -0.48 (-1.69, 0.74) | |||
| Vertical skeletal | ||||
| N-Me change | Hebst VS Twin Block | |||
| Overall | -0.90 (-1.99, 0.19) | 0.106 | 0.0 | |
| Sensitivity analysis | -0.90 (-1.99, 0.19) | |||
| ANS-Me change | Hebst VS Twin Block | |||
| Overall | -0.85 (-2.19, 0.49) | 0.212 | 70.4 | |
| Sensitivity analysis | -0.85 (-2.19, 0.49) | |||
| S-Go change | Hebst VS Twin Block | |||
| Overall | -1.23 (-2.08, -0.38) | 0.005 | 48.3 | |
| Sensitivity analysis | -1.23 (-2.08, -0.38) | |||
| Co-Go change | Hebst VS Twin Block | |||
| Overall | -0.53 (-1.73, 0.66) | 0.380 | 78.9 | |
| Sensitivity analysis | -0.53 (-1.73, 0.66) | |||
| Soft tissue | ||||
| Nasolabial angle change | Hebst VS Twin Block | |||
| Overall | -1.34 (-5.53, 2.85) | 0.531 | 65.3 | |
| Sensitivity analysis | -1.34 (-5.53,2.85) | |||
| SN-GoGn change | Hebst VS Twin Block | |||
| Overall | 0.07 (-0.47, 0.61) | 0.793 | 0.0 | |
| Sensitivity analysis | 0.07 (-0.47, 0.61) | |||
| N-Sn-Pog change | Hebst VS Twin Block | |||
| Overall | -1.89 (-3.12, -0.66) | 0.003 | 0.0 | |
| Sensitivity analysis | -1.89 (-3.12, -0.66) | |||
| N-Prn-Pog change | Hebst VS Twin Block | |||
| Overall | -0.95 (-1.94, 0.05) | 0.062 | 0.0 | |
| Sensitivity analysis | -0.95 (-1.94, 0.05) | |||
| Lower facial height ratio change | Hebst VS Twin Block | |||
| Overall | 0.03 (-0.03, 0.08) | 0.343 | 0.0 | |
| Sensitivity analysis | 0.03 (-0.03, 0.08) | |||
| Maxillary dentoalveolar | ||||
| U1 to SN change | Hebst VS Twin Block | |||
| Overall | 3.34 (2.25, 4.43) | < 0.001 | 75.7 | |
| Sensitivity analysis | 3.34 (2.25, 4.43) | |||
| U1 to palatal plane change | Hebst VS Twin Block | |||
| Overall | -0.16 (-1.12, 0.81) | 0.751 | 72.7 | |
| Sensitivity analysis | -0.16 (-1.12, 0.81) | |||
| U6 to palatal plane change | Hebst VS Twin Block | |||
| Overall | -0.36 (-1.20, 0.48) | 0.402 | 76.6 | |
| Sensitivity analysis | -0.36 (-1.20, 0.48) | |||
| Mandibular dentoalveolar | ||||
| L1 to MP change (°) | Hebst VS Twin Block | |||
| Overall | 2.64 (2.09, 3.19) | < 0.001 | 0.0 | |
| Sensitivity analysis | 2.64 (2.09, 3.19) | |||
| L1 to MP change (mm) | Hebst VS Twin Block | |||
| Overall | 0.76 (0.22, 1.31) | 0.006 | 0.0 | |
| Sensitivity analysis | 0.76 (0.22, 1.31) | |||
| L6 to MP change (mm) | Hebst VS Twin Block | |||
| Overall | -0.36 (-1.36, 0.64) | 0.482 | 61.8 | |
| Sensitivity analysis | -0.36 (-1.36, 0.64) | |||
WMD weighted mean difference, CI confidence interval, SNA Sella-Nasion-point A, SNB Sella-Nasion-point B, Go-Gn mandibular body length, Co-Gn effective mandibular length, N-Me Nasion-submental point, ANS-Me anterior nasal spine-submental point, S-Go Sella-Gonion, Co-Go ramus length, ANB point A-Nasion-point B, SN-GoGn hyperdivergent mandibular growth, N -Sn-Pog convexity angle, N-Prn-Pog total facial convexity angle, U1 to SN Sella-Nasion plane angle, MP mandibular plane