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Fig. 2 | Head & Face Medicine

Fig. 2

From: Incorrect measurements and misleading conclusions in the article “Comparison of the efficacy of tooth alignment among lingual and labial brackets: an in vitro study”

Fig. 2

a An identical set up as in the study of Alobeid et al.: Acrylic resin model (Palavit G 4004; Heraeus Kulzer, Hanau, Germany) was fabricated from a duplicate of a Frasaco model (Frasaco, Tettnang, Germany) of a normal maxillary arch. The upper-right, central incisor was removed. The model was bonded with completely customized lingual brackets with a 0.018” slot size (Incognito, 3M Deutschland, Neuss, Germany). A 0.014” lingual NiTi arch-wire (RMO, Denver, USA) was inserted. As RMO only offers straight lingual arch-wires, these were used in the simulation. The stainless steel ligatures used were tied using a needle holder. The ligature was first tightened around the bracket wings and then loosened one turn, to allow free movement of the arch-wire. b The reference pin was placed at a distance of 2 mm from the arch-wire. c The simulation was carried out at an ambient temperature of 36C (sauna). A horizontal displacement of 2 mm was simulated. At the end of the displacement, the wire was stuck, because of friction and binding, and did not move back at all (correction = 0%). Alobeid et al. reported a correction of 0.6 mm, equal to 35%

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