نتایج جستجو برای: dowel

تعداد نتایج: 406  

Journal: :Journal of prosthodontics : official journal of the American College of Prosthodontists 2010
Jylan El Guindy Manar Y Fouda

PURPOSE The aim of this study was to assess the role of obturating systems, dowel materials, and adhesive techniques on the resistance to fracture of endodontically treated teeth. MATERIAL AND METHODS Eighty maxillary central incisors were selected and randomly divided into two groups according to the obturating system (n = 40); group I: gutta-percha and Roeko sealer; group II: RealSeal. Both...

Journal: :Journal of motor behavior 1988
S A Wallace D L Weeks

Three experiments were conducted to investigate the control of the manipulation (i.e., finger-thumb aperture) and transportation (i.e., wrist velocity) components in prehensile movement (Jeannerod, 1981, 1984). In all experiments, subjects were seated and instructed to grasp a dowel mounted on a joystick following a discrete movement over a set distance. Thus, the amount of dowel movement follo...

Journal: :Veterinary and comparative orthopaedics and traumatology : V.C.O.T 2011
J Yu C E DeCamp R Rooks

OBJECTIVES A retrospective approach was used to detail and evaluate a 'dowel' pinning technique in distal radial fractures in miniature and toy breed dogs. METHODS Medical records and radiographs from 2003-2009 of miniature and toy breed dog radial fractures were examined. Sixty cases were divided into two groups: 51 radial fractures repaired with a 'dowel' pinning and external skeletal fixat...

2000
Adrian Mischler Helmut Prion Frank Lam

This paper details tests on steel-wood-steel connections with thin dowels carried out at the University of British Columbia in Vancouver, Canada. Connections configurations were selected in such a way that the influence of the main parameters such as dowel slenderness ratio, dowel strength, fastener spacing and end distance and the number of dowels could be studied. An important issue of the pa...

Journal: :Experimental brain research 1991
Y Paulignan M Jeannerod C MacKenzie R Marteniuk

1. Subjects were instructed to reach and grasp cylindrical objects, using a precision grip. The objects were two concentric dowels made of translucent material placed at 35 cm from the subject. The inner ("small") dowel was 10 cm high and 1.5 cm in diameter. The outer ("large") dowel was 6 cm high and 6 cm in diameter. Prehension movements were monitored using a Selspot system. The displacement...

Journal: :Journal of prosthodontics : official journal of the American College of Prosthodontists 2009
Carlos José Soares Carolina Guimaraes Castro Paulo César Freitas Santos Filho Paulo Vinícius Soares Denildo Magalhaes Luis Roberto Marcondes Martins

PURPOSE The degree of stress generated in the endodontically treated and restored tooth can be influenced by the composition and configuration of the dowels used for the restoration. Using two-dimensional (2D) finite element analysis (FEA), this study tested the hypothesis that the characterization of the stress distribution can be influenced by which evaluation method is employed: protrusion l...

2012
Nadia Z. Fahmy

Statement of problem: A dowel is essential to retain the core in case of severe tooth destruction. However, the placement of a dowel and core may actually weaken teeth and affect their failure pattern depending on their material properties and stress transfer. Purpose: The present study compared the fracture resistance and failure pattern of endodontically treated premolars with different amoun...

2005
Sean Duffy Susan Levine

Two experiments tested the ability of 4and 8-year-old children to encode the extent of a target dowel and later discriminate between the target and a foil having a novel extent. By manipulating the heights of containers in which we presented the stimuli we tested whether children used the relation between the dowels and containers for encoding extent. We found that 8-year-olds encoded extent wi...

Journal: :Journal of prosthodontics : official journal of the American College of Prosthodontists 2010
Brian J Rasimick Jeffrey Wan Barry L Musikant Allan S Deutsch

PURPOSE Previous clinical studies indicated loss of retention between dowel and tooth was a major cause of failure for passive endodontic dowels. Advances in luting cement technology may have improved the retention of dowels. The purpose of this systematic review was to determine the clinical failure modes for dowel/core/crown restorations luted using resin-based cements that are either self-et...

2015
Michael Dorn Karin de Borst Josef Eberhardsteiner

Dowel-type connections are commonly used in timber engineering for a large range of structural applications. The current generation of design rules is largely based on empiricism and testing and lacks in many parts a stringent mechanical foundation. This often blocks an optimized use of the connections, which is essential for the design of economically efficient structures. Moreover, it severel...

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