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Dirk Wiechmann


Dirk Wiechmann

Prof. Wiechmann received the recognition as a specialist in orthodontics in 1997, since then he has been in private practice in Bad Essen, Germany, the largest lingual practice in the world with about 1000 lingual patients in active treatment.

In 2011 he received his PhD in orthodontics. He became a professor in orthodontics at the Hannover Medical School in 2013. Prof. Wiechmann received the Doctor Honoris Causa from the University of Montpellier, France in 2016.

His scientific and clinical work in the field of lingual orthodontics was recognized by many awards including the “prix d’honeur” of the French Federation of Orthodontics.

The focus of his scientific and clinical research is excellence in lingual orthodontics.

Summary of Speech
Class II correction by maxillary en masse distalization using a completely customized lingual appliance and a novel mini-screw anchorage concept- preliminary results

Background: The aim of the study was to evaluate the efficacy of a novel en masse distalization method in the maxillary arch in combination with a completely customized lingual appliance (CCLA; WIN, DW-Lingual Systems, Germany). Therefore, we tested the null-hypothesis of a significant deviation from an Angle-Class I canine relationship and a normal overjet defined by an individual target set-up after dentoalveolar compensation in Angle Class II subjects.
Methods: This retrospective study included 23 patients, (m/f 3/20, mean age 29.6 years (min/max, 13.6/50.9 years)), with inclusion criteria of an Angle Class II occlusion of more than half a cusp prior to en masse distalization and treatment completed consecutively with a CCLA in combination with a mini-screw (MS) anchorage for uni- or bilateral maxillary distalization (12 bilateral situations, totalling 35). Plaster casts taken prior to (T0) and following CCLA treatment (T3) were compared with the treatment plan / set-up (TxP, with a Class I canine relationship and a normal overjet as the treatment objective). MSs were placed following levelling and aligning (T1) and removed at the end of en masse distalization at T2. Statistical analysis was carried out using Schuirmann’s TOST [two one-sided tests] equivalence test, based on a one-sample t-test with α=0.025 on each side (total α=0.05).
Results: 97% of planned correction of the canine relationship was achieved (mean 3.6 of 3.7 mm) and also 97% of the planned overjet correction (mean 3.1 of 3.2 mm), with a statistically significant equivalence (p<0.0001) for canine relationship and overjet between the individual treatment plan (set-up) and the final outcome. Adverse effects were limited to the loss of n=2 of 35 mini-screws. However, in each instance, the treatment was completed, as scheduled, without replacing them. Accordingly, the null-hypothesis was rejected.
Conclusion: The technique presented allows for a predictable correction of an Angle-Class II malocclusion via dento-alveolar compensation with maxillary en masse distalization.