Dietmar Segner

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An adequate analysis of the skeletal pattern is essential since a considerable amount of dental compensation can mask the severity of a malocclusion. Disagreement prevails over the standards that should be used to judge the individual values. The paper describes a method of analyzing the skeletal pattern of a patient on an individualized basis. Rather than(More)
The aim of this study was to investigate whether in the maxilla and in the mandible the structure of the anterior medial sagittal alveolar and basal bone is related to the overbite. A total of 460 untreated adult subjects were divided into four groups with either deep bite, normal overbite, end-to-end bite, or open bite and were compared. The overbite,(More)
In this study tools were developed to test and compare levelling archwires that the manufacturers claim to have superelastic properties. As the classic spring model and Hook's law cannot be applied, new parameters had to be found. It could be shown that three parameters are necessary to describe a superelastic archwire adequately: the distinctiveness of the(More)
Bonded retainers have become a very important retention appliance in orthodontic treatment. They are popular because they are considered reliable, independent of patient cooperation, highly efficient, easy to fabricate, and almost invisible. Of these traits, reliability is the subject of this clinical study. A total of 549 patients with retainers were(More)
In dieser experimentellen Untersuchung wurde die Haftfestigkeit von Metallbrackets auf gegossenen Prüfkörpern aus sechs verschiedenen Dentallegierungen gemessen. Die Haftfestigkeit der Brackets wurde in einer Instron-Zugmaschine geprüft. Es wird eine reproduzierbare Methode beschrieben, die den derzeitigen internationalen Empfehlungen zur Testung von(More)
This experimental study employed an Instron test machine to measure the bond strength of metal brackets to cast test specimens made of 6 different dental alloys. An easily replicated method for testing the shear bond strength is presented, which corresponds to the international recommendations for testing bond strength of orthodontic brackets. The study(More)
One hundred twenty bovine teeth were bonded with two types of metal brackets and a new ceramic bracket for comparison. Two different adhesives were used, a so-called no-mix and a paste/paste adhesive. The shear bond strength of the ceramic bracket was found to be superior for both adhesives. Bond failure with the ceramic bracket occurred predominantly in(More)
Recently archwire materials have become available which are claimed to be capable of exerting different force levels within one arch. Such orthodontic archwires are of importance because the forces they exert are supposed to be better adapted to different physiological force levels as required by teeth with different root surface areas. Undesired side(More)
The purpose of this study was to investigate the effect of friction on the bending stiffness of orthodontic beams. A theoretical and experimental model have been established where tensile and compressive forces are applied to an arch wire to simulate the effect of additional friction during activation and deactivation, respectively. The results show that(More)
Three hundred and fifty bovine teeth were bonded with a ceramic bracket using nine different materials. Five of the materials were composites used in conservative dentistry, two were light-curing orthodontic adhesive test materials, and two were chemically curing adhesives. Four of the materials were modified by dilution with resin. With the proper(More)