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. 2024 Feb 26;24:278. doi: 10.1186/s12903-024-04027-w

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