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Ove A. Peters - One of the best experts on this subject based on the ideXlab platform.

  • effect of canal preparation with trushape and vortex rotary instruments on three dimensional geometry of oval root canals
    Australian Endodontic Journal, 2018
    Co-Authors: Ana Arias, Frank Paqué, Stephanie Shyn, Sarah Murphy, Ove A. Peters
    Abstract:

    The purpose of this study was to assess the geometry of non-round root canals after preparation with TRUShape (a novel instrument with s-shaped longitudinal design) in comparison to conventional rotary instrumentation using micro-computed tomography. Twenty distal root canals of mandibular molars were randomly distributed in two groups to be shaped with either TRUShape or Vortex rotaries. Percentages of unprepared surface and volume of dentin removal for the entire canal and for the apical 4 mm were calculated. Canal transportation and the structure Model Index (SMI) were assessed. Data were compared with Student t-tests. Shaping with both techniques resulted in similar prepared surface and volume of dentin removed, as well as the extent of canal transportation. The SMI shape factor was significantly lower for TRUShape preparations (P = 0.04) suggesting less rounding during rotary preparation. Although both instruments were suitable for the preparation of oval canals, TRUShape appeared to better conform to the original ribbon-shaped anatomy.

  • effects of root canal preparation on apical geometry assessed by micro computed tomography
    Journal of Endodontics, 2009
    Co-Authors: Frank Paqué, Daniel Ganahl, Ove A. Peters
    Abstract:

    Introduction: Previous micro–computed tomography analyses of root canal preparation provided data that were usually averaged over canal length. The aim of this study was to compare preparation effects on apical root canal geometry. Methods: Sixty extracted maxillary molars (180 canals) used in prior studies were reevaluated for analyses of the apical 4 mm. Teeth were scanned by using micro–computed tomography before and after canal shaping with FlexMaster, GTRotary, Lightspeed, ProFile, ProTaper, instruments or nickel-titanium K-files for hand instrumentation. Apical preparation was to a size #40 in mesiobuccal and distobuccal and #45 in palatal canals except for GT (#20) and ProTaper (#25 in mesiobuccal and distobuccal and #30 in palatal canals, respectively). Data for canal volume changes, the structure Model Index (quantifying canal cross sections), and untreated surface area were con

  • Effects of Root Canal Preparation on Apical Geometry Assessed by Micro–Computed Tomography
    Journal of Endodontics, 2009
    Co-Authors: Frank Paqué, Daniel Ganahl, Ove A. Peters
    Abstract:

    Introduction: Previous micro–computed tomography analyses of root canal preparation provided data that were usually averaged over canal length. The aim of this study was to compare preparation effects on apical root canal geometry. Methods: Sixty extracted maxillary molars (180 canals) used in prior studies were reevaluated for analyses of the apical 4 mm. Teeth were scanned by using micro–computed tomography before and after canal shaping with FlexMaster, GTRotary, Lightspeed, ProFile, ProTaper, instruments or nickel-titanium K-files for hand instrumentation. Apical preparation was to a size #40 in mesiobuccal and distobuccal and #45 in palatal canals except for GT (#20) and ProTaper (#25 in mesiobuccal and distobuccal and #30 in palatal canals, respectively). Data for canal volume changes, the structure Model Index (quantifying canal cross sections), and untreated surface area were con

Frank Paqué - One of the best experts on this subject based on the ideXlab platform.

  • effect of canal preparation with trushape and vortex rotary instruments on three dimensional geometry of oval root canals
    Australian Endodontic Journal, 2018
    Co-Authors: Ana Arias, Frank Paqué, Stephanie Shyn, Sarah Murphy, Ove A. Peters
    Abstract:

    The purpose of this study was to assess the geometry of non-round root canals after preparation with TRUShape (a novel instrument with s-shaped longitudinal design) in comparison to conventional rotary instrumentation using micro-computed tomography. Twenty distal root canals of mandibular molars were randomly distributed in two groups to be shaped with either TRUShape or Vortex rotaries. Percentages of unprepared surface and volume of dentin removal for the entire canal and for the apical 4 mm were calculated. Canal transportation and the structure Model Index (SMI) were assessed. Data were compared with Student t-tests. Shaping with both techniques resulted in similar prepared surface and volume of dentin removed, as well as the extent of canal transportation. The SMI shape factor was significantly lower for TRUShape preparations (P = 0.04) suggesting less rounding during rotary preparation. Although both instruments were suitable for the preparation of oval canals, TRUShape appeared to better conform to the original ribbon-shaped anatomy.

  • effects of root canal preparation on apical geometry assessed by micro computed tomography
    Journal of Endodontics, 2009
    Co-Authors: Frank Paqué, Daniel Ganahl, Ove A. Peters
    Abstract:

    Introduction: Previous micro–computed tomography analyses of root canal preparation provided data that were usually averaged over canal length. The aim of this study was to compare preparation effects on apical root canal geometry. Methods: Sixty extracted maxillary molars (180 canals) used in prior studies were reevaluated for analyses of the apical 4 mm. Teeth were scanned by using micro–computed tomography before and after canal shaping with FlexMaster, GTRotary, Lightspeed, ProFile, ProTaper, instruments or nickel-titanium K-files for hand instrumentation. Apical preparation was to a size #40 in mesiobuccal and distobuccal and #45 in palatal canals except for GT (#20) and ProTaper (#25 in mesiobuccal and distobuccal and #30 in palatal canals, respectively). Data for canal volume changes, the structure Model Index (quantifying canal cross sections), and untreated surface area were con

  • Effects of Root Canal Preparation on Apical Geometry Assessed by Micro–Computed Tomography
    Journal of Endodontics, 2009
    Co-Authors: Frank Paqué, Daniel Ganahl, Ove A. Peters
    Abstract:

    Introduction: Previous micro–computed tomography analyses of root canal preparation provided data that were usually averaged over canal length. The aim of this study was to compare preparation effects on apical root canal geometry. Methods: Sixty extracted maxillary molars (180 canals) used in prior studies were reevaluated for analyses of the apical 4 mm. Teeth were scanned by using micro–computed tomography before and after canal shaping with FlexMaster, GTRotary, Lightspeed, ProFile, ProTaper, instruments or nickel-titanium K-files for hand instrumentation. Apical preparation was to a size #40 in mesiobuccal and distobuccal and #45 in palatal canals except for GT (#20) and ProTaper (#25 in mesiobuccal and distobuccal and #30 in palatal canals, respectively). Data for canal volume changes, the structure Model Index (quantifying canal cross sections), and untreated surface area were con

James W Derby - One of the best experts on this subject based on the ideXlab platform.

  • Mathematical Model and Energy Efficiency Analysis of a Scroll-type Air Motor
    2010
    Co-Authors: Li Yang, Jihong Wang, Stephen Mangan, James W Derby
    Abstract:

    Abstract—The paper presents a simplified mathematical Model for a scroll-type air motor. Through air power/energy analysis, it has shown that a scroll-type air motor with a properly specified structure and suitable pressure of compressed air supply is able to achieve high energy efficiency and satisfies air power requirement. The features of a scroll-type air motor in geometry, mechanical structure, and pneumatic power transmission are studied in the paper. Differential geometry is used as the mathematical tool to parameterise the scroll. In this study, Matlab Symbolic Math Toolbox is found very efficient in finding analytic expressions of scroll chamber volumes and generalised torques. State shifting is employed to solve the dynamic system equations numerically. Energy efficiency of the scroll-type air motor is analysed based on the mathematical Model. Index Terms — Energy efficiency, scroll-type air motors, pneumatic actuators, mathematical Modeling. I

  • Energy Efficiency Analysis of a Scroll-type Air Motor Based on a Simplified Mathematical Model
    2009
    Co-Authors: Li Yang, Jihong Wang, Stephen Mangan, James W Derby
    Abstract:

    Abstract—The paper presents a simplified mathematical Model for a scroll-type air motor. Through air power/energy analysis, it has shown that a scroll-type air motor with a properly specified structure and suitable pressure of compressed air supply is able to achieve high energy efficiency and satisfies air power requirement. The features of a scroll-type air motor in geometry, mechanical structure, and pneumatic power transmission are studied in the paper. Differential geometry is used as the mathematical tool to parameterise the scroll. In this study, Matlab Symbolic Math Toolbox is found very efficient in finding analytic expressions of scroll chamber volumes and generalised torques. State shifting is employed to solve the dynamic system equations numerically. Energy efficiency of a scroll-type air motor is analysed based on the mathematical Model. Index Terms — Energy efficiency, scroll-type air motors, pneumatic actuators, mathematical Modeling. I

Graziela Bianchi Leoni - One of the best experts on this subject based on the ideXlab platform.

  • Effect of canal preparation with XP-endo Shaper and ProTaper Next on root canal geometry and dentin thickness of mandibular premolars with radicular grooves and two canals: a micro-CT study
    Clinical Oral Investigations, 2021
    Co-Authors: Nathália Mancioppi Cerqueira, Victoria Gabriela Louzada, Yara Teresinha Corrêa Silva-sousa, Walter Raucci-neto, Graziela Bianchi Leoni
    Abstract:

    Objectives This study aimed to evaluate the effects of different shaping protocols on the root canal geometry and remaining dentin thickness of mandibular premolars with radicular grooves (RG) and two canals by means of micro-CT. Materials and methods Mandibular premolars with RG and two canals were matched based on their similar morphological dimensions and assigned to 2 experimental groups according to the canal preparation ( n =8): XP-endo Shaper (XPS) and ProTaper Next (PTN) systems. Before and after preparation, morphometric measurements of the volume, surface area, structure Model Index, area, perimeter, roundness, major and minor diameters, as well as untouched canal walls, canal transportation, and dentin wall thickness were evaluated. Data were statistically compared within and between groups using the independent sample t test ( α =5%). Results XPS revealed less changes in volume, surface area, area, perimeter, and major and minor diameters ( P 0.05). XPS resulted in less apical canal transportation and a higher remaining dentin thickness toward the RG compared to PTN in lingual canals ( P

Daniel Ganahl - One of the best experts on this subject based on the ideXlab platform.

  • effects of root canal preparation on apical geometry assessed by micro computed tomography
    Journal of Endodontics, 2009
    Co-Authors: Frank Paqué, Daniel Ganahl, Ove A. Peters
    Abstract:

    Introduction: Previous micro–computed tomography analyses of root canal preparation provided data that were usually averaged over canal length. The aim of this study was to compare preparation effects on apical root canal geometry. Methods: Sixty extracted maxillary molars (180 canals) used in prior studies were reevaluated for analyses of the apical 4 mm. Teeth were scanned by using micro–computed tomography before and after canal shaping with FlexMaster, GTRotary, Lightspeed, ProFile, ProTaper, instruments or nickel-titanium K-files for hand instrumentation. Apical preparation was to a size #40 in mesiobuccal and distobuccal and #45 in palatal canals except for GT (#20) and ProTaper (#25 in mesiobuccal and distobuccal and #30 in palatal canals, respectively). Data for canal volume changes, the structure Model Index (quantifying canal cross sections), and untreated surface area were con

  • Effects of Root Canal Preparation on Apical Geometry Assessed by Micro–Computed Tomography
    Journal of Endodontics, 2009
    Co-Authors: Frank Paqué, Daniel Ganahl, Ove A. Peters
    Abstract:

    Introduction: Previous micro–computed tomography analyses of root canal preparation provided data that were usually averaged over canal length. The aim of this study was to compare preparation effects on apical root canal geometry. Methods: Sixty extracted maxillary molars (180 canals) used in prior studies were reevaluated for analyses of the apical 4 mm. Teeth were scanned by using micro–computed tomography before and after canal shaping with FlexMaster, GTRotary, Lightspeed, ProFile, ProTaper, instruments or nickel-titanium K-files for hand instrumentation. Apical preparation was to a size #40 in mesiobuccal and distobuccal and #45 in palatal canals except for GT (#20) and ProTaper (#25 in mesiobuccal and distobuccal and #30 in palatal canals, respectively). Data for canal volume changes, the structure Model Index (quantifying canal cross sections), and untreated surface area were con