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Dhaval Lekhadia – One of the best experts on this subject based on the ideXlab platform.

  • treatment of skeletal class ii with underlying angle s class i bimaxillary dentoalveolar protrusion and software surgery simulation for advancement genioplasty a case report
    Imperial journal of interdisciplinary research, 2017
    Co-Authors: Dhaval Lekhadia

    Abstract:

    A 19 year old female patient presented with proclined upper and lower incisors. Also she presented with a reduced soft tissue chin thickness and a retrogenia. First premolar extraction was planned to reduce the proclination of incisors. The patient had a vertical growth pattern and convex profile thus making it a case of critical anchorage. Implant being the first choice of option was rejected by the patient. Thus two stage retraction was chosen wherein canine were retracted in the first stage followed by incisor retraction. Lacebacks were continued throughout the initial levelling and Alignment Phase. Active lacebacks were chosen instead of passive lacebacks which helped walk the canine distally. For retraction of incisors TAD springs were used on a continuous 0.019×0.025” SS wire.  After space closure, mobile software was used to simulate advancement genioplasty.

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  • Treatment of Skeletal Class II with underlying Angle’s Class I bimaxillary dentoalveolar protrusion and software Surgery Simulation for Advancement Genioplasty: A Case Report.
    Imperial journal of interdisciplinary research, 2017
    Co-Authors: Dhaval Lekhadia

    Abstract:

    A 19 year old female patient presented with proclined upper and lower incisors. Also she presented with a reduced soft tissue chin thickness and a retrogenia. First premolar extraction was planned to reduce the proclination of incisors. The patient had a vertical growth pattern and convex profile thus making it a case of critical anchorage. Implant being the first choice of option was rejected by the patient. Thus two stage retraction was chosen wherein canine were retracted in the first stage followed by incisor retraction. Lacebacks were continued throughout the initial levelling and Alignment Phase. Active lacebacks were chosen instead of passive lacebacks which helped walk the canine distally. For retraction of incisors TAD springs were used on a continuous 0.019×0.025” SS wire.  After space closure, mobile software was used to simulate advancement genioplasty.

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H.-p. Bantleon – One of the best experts on this subject based on the ideXlab platform.

  • Deformation and Deactivation Characteristics of Nickel-Titanium Wires During the Alignment Phase
    , 2010
    Co-Authors: B. C. Pseiner, J. Bantleon, J. W. Freudenthaler, H.-p. Bantleon

    Abstract:

    An ideal levelling wire should be capable of mov-ing teeth with light continuous forces for a couple of weeks. This laboratory study compared the performance of currently available nickel-tita-nium (Ni-Ti) wires regarding possible permanent deformation and their force-deflection charac-ter-istics during the Alignment Phase. Ni-Ti wires -obtained from 4 manufacturers (3M Unitek, Ormco, Forestadent, GAC) were studied in a static test-ing device simulating a dental arch with mal-positioned teeth. The deflection ranged from 1 to 6 mm. Permanent deformation was studied by scanning the tested wires after thermocycling of one day, 14 and 28 days. Force measurements for all tested 0.014″-wires were performed at 37 °C by simulating a 3 tooth relationship deflect-ing the wire according to the previous experiment. An electronic measuring device recorded the force level at every 0.1 mm-step during the grad-ual levelling. No measureable permanent deformation was detected in any of the tested rum;Ni-Ti wires. However, 3 of 5 Damon™ -CuNiTi specimens were fractured after the 4-week period. All pseudoelastic wires exhibited a martensitic plateau (except Nitinol Classic) in a range between 70 and 150 cN, whereas Sentalloy® showed a plateau between 20 and 80 cN. Statistically significant differences (p < 0.05) in forces were observed among the wires. With modern pseudoelastic Ni-Ti wires (0.014″), no permanent deformation is to be expected in the Alignment Phase; hence, the clinician is able to select suit-able wires delivering low forces.

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  • Practical Use and Clinical Relevance of Binding
    , 2007
    Co-Authors: K. Schwarz, A. G. Crismani, N. Strobl, H.-p. Bantleon

    Abstract:

    During the Alignment Phase binding of the archwire is counteracting tooth movement. The higher the angle between bracketslot and wire the greater the elastic deformation hindering sliding of the tooth. For a buccaly blocked out canine the model of a three-bracket-relationship shows horizontally active forces opening up the space for the canine without the use of additional elements like open coil springs or elastic chains.

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  • Praktischer Nutzen und klinische Relevanz des Binding-Effektes
    , 2007
    Co-Authors: K. Schwarz, A. G. Crismani, N. Strobl, H.-p. Bantleon

    Abstract:

    Eine Komponente der einer Zahnbewegung entgegenwirkenden Kraft stellt das so genannte Binding dar. Dabei handelt es sich um eine durch zunehmende Angulation des Zahnes hervorgerufene elastische Deformation des Drahtes. Die freie Gleitbewegung des Bogens durch den Bracketslot wird dadurch erschwert. Im Falle einer vorliegenden Drei-Bracket-Beziehung zeichnet sich dieser Klemmeffekt durch die dabei generierten horizontalen und somit luckenoffnenden Kraftkomponenten aus. Klinisch bedeutet dies fur den Kieferorthopaden die Vermeidung von zusatzlichen luckenoffnenden Hilfselementen wie Druckfedern oder elastischen Ketten. During the Alignment Phase binding of the archwire is counteracting tooth movement. The higher the angle between bracketslot and wire the greater the elastic deformation hindering sliding of the tooth. For a buccaly blocked out canine the model of a three-bracket-relationship shows horizontally active forces opening up the space for the canine without the use of additional elements like open coil springs or elastic chains.

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Eric Parent – One of the best experts on this subject based on the ideXlab platform.

  • Development and Evaluation of CT-to-3D Ultrasound Image Registration Algorithm in Vertebral Phantoms for Spine Surgery
    Annals of Biomedical Engineering, 2020
    Co-Authors: Andrew Chan, Brendan Coutts, Eric Parent

    Abstract:

    Posterior spinal fusion surgery requires careful insertion of screws into the spine to avoid neurologic injury. While current systems use CT-scans, three-dimensional ultrasound (3DUS) could provide guidance by reconstructing the vertebral surface, and then registering a pre-operative vertebral model to that surface for localization. The aim of this study was to evaluate the accuracy and processing time of a custom CT-3DUS registration algorithm. A phantom human vertebra was 3D-printed and scanned with a motion capture-based 3D ultrasound (3DUS) system. Image registration was performed that included a pre-Alignment Phase using vertebral symmetry information, and then comparing Gaussian pyramid intensity-based registration with iterative-closest-point registration for final transformations. Image registration was performed 192 times while surgical registration between CT and real-world position was performed 84 times. The accuracy of image registration (CT-to-3DUS) was 0.3 ± 0.2 mm and 0.9 ± 0.8° completed in 13.3 ± 2.9 s. The surgical navigation accuracy (CT model to real-world position) of the system was 1.2 ± 0.5 mm and 2.2 ± 2.0° completed in 16.2 ± 3.0 s. Both meet accuracy thresholds of 

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