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báo cáo khoa học: " Control of mandibular incisors with the combined Herbst and completely customized lingual appliance - a pilot study"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Control of mandibular incisors with the combined Herbst and completely customized lingual appliance - a pilot study | Wiechmann et al. Head Face Medicine 2010 6 3 http www.head-face-med.eom content 6 1 3 HEAD FACE MEDICINE RESEARCH Open Access Control of mandibular incisors with the combined Herbst and completely customized lingual appliance - a pilot study Dirk Wiechmann13 Rainer Schwestka-Polly23 Hans Pancherz33 Ariane Hohoff4 3 4 Abstract Background The traditional Herbst appliance induces mandibular incisor proclination independent of the anchorage system used. The dental effects of the Herbst appliance as an element of a completely customized lingual orthodontic LO appliance Incognito 3 M has not been analyzed yet and the aim of this paper was to measure the effect of mandibular incisor proclination using this Herbst-LO device. Methods Retrospective study. Inclusion criteria a Class II 5 mm molar relationship b Herbst appliance 9 months in situ and c finished active treatment. Incisor position was measured on digital models before treatment on the digital target setup and on digital models obtained at the day of debonding. All measurements were performed by one investigator. Results Twelve patients 8 females 4 males out of 632 cases treated with a lingual appliance were included in the study. The measurement error computed with Dahlberg s formula was 0.2 . Seven cases had planned target setup mandibular incisor uprighting ccr and five cases had proclination clockwise rotation . There was no statistical difference p 0.05 between planned incisor rotations of the target setup and achieved incisor rotations at the day of debonding. The overall mean difference was 2.2 1.0 . Conclusions The Incognito-Herbst combination is the first Herbst device with full control over mandibular incisor movement. Using this system anchorage loss or anchorage gain is independent of the Herbst treatment. It depends only on the planned tooth position of the individual target setup. Background Treatment using Herbst telescopes can be expected to have different effects. For instance 87 of overjet .