Deformation of the orthodontic bracket upon wire engagement may result in torque dissipation within the bracket rather than transmission to the tooth and its supporting structures. The purpose of this study was: 1) quantify the amount of torque expression and 2) quantify any deformation as a result of such increasing torque expression. Digital image correlation is an accurate means of analyzing an orthodontic bracket's structural response to an applied moment of force created through archwire rotation in vitro. A sample of 30 Orthos and 30 OrthosTi brackets were tested with custom software using a novel application of digital image correlation. OrthosTi brackets produce significantly greater amounts of torque from 48 to 24 returning to a neutral position. Titanium brackets exhibit greater variance in torque expression but less variance in deformation. Orthos stainless steel brackets exhibit significantly greater amounts of bracket slot deformation in comparison to the OrthosTi. / Orthodontics

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Der Begriff von Orthos Logos ist zentral für die ethische Lehre Aristoteles’. In der Literatur ist jedoch umstritten, was der Inhalt von OL ist. Das genaue Wesen von OL liegt immer noch im Dunkel. Ziel meiner Dissertation ist es, den Beitrag von OL für Aristoteles’ Ethik zu erforschen. Dabei soll vor allem erläutert werden, was OL ist bzw. was OL leisten kann. Auf dieser Untersuchung basierend versuche ich, eine ausführliche bzw. in sich konsistente Interpretation der wichtigen Bestandteile der Nicomachischen Ethik zu liefern. Ich werde dafür argumentieren, dass OL als der praktische Syllogismus selbst aufzufassen ist, der die moralischen Subjekte darüber informiert, was sie tun sollen bzw. weswegen sie gerade dies und nicht etwas anderes tun sollen. Sofern ein hinsichtlich der Moralität noch lernender Mensch den Syllogismus nicht vollständig begreift, ist es allerdings möglich, dass OL diesem Menschen etwas anderes zu sein scheint. / The notion of the orthos logos (abbr. OL) is vital and decisive for Aristotle’s ethical project. The question of what OL really means is a vigorously debated issue. But what the OL exactly is still remains ambiguous and obscure. The purpose of my dissertation is to inquire into the philosophical contribution of the OL in Aristotle’s Ethics. To fulfil this goal, it is essentially to determine what the OL is and what the OL can do. Through this inquiry I seek to present a comprehensive and consistent reading of important parts of Aristotle’s Nicomachean Ethics. I will argue that the OL is the practical syllogism per se, which could tell moral people what should they do and why should they do this or that. But it could also appear to be something else for moral learners, since they are not capable of fully understanding the syllogism yet.