Effizienz kieferorthopädischer Therapie des Distalbisses (Angle Klasse II:1)

Abstract

Aim: To assess the efficiency of early and late Class II:1- treatment in the mixed and permanent dentition. Treatment efficiency was defined as a better result in a shorter treatment time.
Subjects and Methods: 204 patients with Class II:1 malocclusions treated in the early mixed (DS 2; n= 54), late mixed (DS 3; n= 104), and permanent dentition (DS 4; n= 46). The pre- and posttreatment dental casts were evaluated using the PAR Index.
Results: The duration of treatment decreased with progressing dental development: patients in the early mixed dentition (DS 2) were treated for 53 months, patients in the late mixed dentition (DS 3) for 36 months, and patients in the permanent dentition (DS 4) for 23 months. Patients treated exclusively with fixed appliances (Herbst- and/or multibracket) had a shorter treatment duration (21 i.e. 26 months) than patients treated with functional- or the combination of appliances (removable/ functional/ multibracket) (43 i.e. 49 months). The PAR-score-reduction (= improvement) increased with progressing dental development: DS 2- patients had a PAR- score- reduction of 61%, DS 3- patients of 68%, and DS 4- patients of 73%. Patients treated exclusively with fixed appliances (Herbst- and/or multibracket) had a greater PAR- score- reduction (74%) than patients treated with functional- or the combination of appliances (removable/ functional/ multibracket) (55% i.e. 68%).
Conclusion: Treatment of Class II:1 malocclusions was more efficient in the permanent dentition (late treatment) than in the mixed dentition (early treatment).