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Dentoskeletal effects during Herbst-Multibracket appliance treatment: a comparison of lingual and labial approaches
Niko C Bock1, Sabine Ruf2, Dirk Wiechmann3
1*Department of Orthodontics, University of Giessen.
Objectives:
To analyse and compare the effects during Herbst treatment (Tx) when combined with lingual (completely customized) or labial (straight-wire) multibracket appliances (MBA).
Subjects And Methods:
18 Class II division 1 patients (Overjet ≥ 5mm, Class II molar relationship ≥ 0.5 cusp width bilaterally or 1 cusp width unilaterally, median age 16.0 years) treated with lingual (completely customized) MBA in combination with a Herbst appliance were matched (sagittal molar relationship and skeletal maturity) to 18 Class II division 1 Herbst patients treated with labial (straight-wire) MBA. Lateral cephalograms from before, during and after all active Tx were analysed using the SO-analysis and standard cephalometric variables.
Results:
During the Herbst phase (LINGUAL: mean = 13.9 months, LABIAL: mean = 8.5 months) smaller average Overjet and molar relationship changes were seen in the LINGUAL (5.3mm/4.4mm) than in the LABIAL (8.0mm/5.9mm) group. This was due to the fact that the LABIAL patients were treated to overcorrected sagittal relationships. During the total Tx period (Herbst + MBA; LINGUAL: mean = 3.1 years, LABIAL: mean = 1.9 years) the average amounts of Overjet and molar relationship changes were similar in both groups (LINGUAL: 4.0mm/3.3mm, LABIAL: 5.1mm/3.7mm). Overjet correction was achieved by 45% (LINGUAL) and 37% (LABIAL) skeletal changes; the respective amounts for molar relationship correction were 55% (LINGUAL) and 51% (LABIAL).
Conclusion:
For most variables, similar effects occurred during Herbst Tx whether combined with lingual (completely customized) or labial (straight-wire) MBA.
