Optimum pure intrusion of a mandibular canine with the segmented arch in lingual orthodontics

Bio-medical Materials and Engineering
Abhishek M ThoteSunita Shrivastava

Abstract

Approximately 50% patients with a deep bite possess anatomically extruded mandibular canines. The objective of this study was to specify an optimum toe (Θ) of the vertical segment of a cantilever from the distal aspect to achieve pure intrusion of a mandibular canine with the segmented arch in lingual orthodontics (LiO). The geometrical model of a mandibular canine was developed to compute the required values of Θ (positive values - toe-in, negative values - toe-out). Different positions of the cantilever attachment on the lingual bracket top (occlusal) surface were considered according to different heights (h) from the cusp of a canine i.e. 2, 3, 4 and 5 mm in each case of horizontal distance (x) from canine surface i.e. 2 and 3 mm. In x=2mm case, the required values of Θ at h=2,3,4 and 5mm were -5°, 0°, +6° and +11° respectively. While, in x=3mm case, the required values of Θ at h=2,3,4 and 5mm were 0°, +5°, +12° and +17° respectively. In finite element analysis (FEA), the computed values of Θ were verified by displaying the results of a mandibular canine movement in the form of vectors of nodal displacements along with undeformed and deformed models. In the cases of x=2mm and 3mm, no toe angles were required at heights h=3mm...Continue Reading

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Jan 15, 2016·Computers in Biology and Medicine·Abhishek M ThoteSunita Shrivastava

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Citations

Sep 1, 2019·Materials·Gabriela Meyge de BritoDauro Douglas Oliveira

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