Results 251 to 260 of about 114,321,802 (286)

A Comparison of Torque Forces Used to Apply Intermaxillary Fixation Screws

Journal of Oral and Maxillofacial Surgery, 2015
When establishing intermaxillary fixation (IMF) using bone screws, fracture of a screw is a potential complication. This study was conducted to investigate the forces that arise at bone screw insertion and to determine safety margins between torque for manually tightened insertion and torque until breakage for 3 different IMF screw systems, which could
Bins, A., Baart, J.A., Forouzanfar, T., van Loon, J.J.W.A.   +3 more
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Moments and Forces During Pedicle Screw Insertion

Spine, 1998
Moments and forces during pedicle screw insertion were measured in vivo and in vitro and were correlated to several parameters of the screw-bone interface.To compare the in vitro and in vivo screw insertion loads and to relate these measurements to bone mineral density, pedicle size, and other screw parameters (material, diameter).The in vitro screw ...
Bühler DW, Berlemann U, Oxland TR, Nolte LP   +3 more
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Dynamic Simulation of Bearing Forces in Screw Compressors

Advanced Energy Systems, 1997
Abstract In most current investigations on bearing forces in screw compressors, the supports at the bearings are basically treated as ideal, simply supported boundary conditions [Adams and Soedel, 1995; Qin and Adams, 1996; You et al, 1994].
Glynn P. Adams, Zhaohui Qin
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[Measurements of the transfer of force by bone screws].

Deutsche zahnarztliche Zeitschrift, 1980
Bone screws normally used for functionally stable osteosynthesis were subjected to marginal torque in a limited number of cadaver mandibles. Since the various manufacturers differ considerably in lead, form of thread, and relation of external and internal diameters, the experiments appeared to us to be revealing in terms of the practical application ...
F, Schmid, B, Dirr
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Biodegradable Interference Screw Fixation Exhibits Pull-Out Force and Stiffness Similar to Titanium Screws

The American Journal of Sports Medicine, 1998
Recently, increased interest in biodegradable interference screws for bone-tendon-bone graft fixation has led to numerous screws becoming available. The implants are made from different polymers and have different designs, which might influence their mechanical properties.
A, Weiler, H J, Windhagen, M J, Raschke, A, Laumeyer, R F, Hoffmann   +4 more
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Undertapping of Lumbar Pedicle Screws Can Result in Tapping With a Pitch That Differs From That of the Screw, Which Decreases Screw Pullout Force

Spine, 2015
Survey of spine surgeons and biomechanical comparison of screw pullout forces.To investigate what may be a suboptimal practice regularly occurring in spine surgery.In order for a tap to function in its intended manner, the pitch of the tap should be the same as the pitch of the screw. Undertapping has been shown to increase the pullout force of pedicle
Daniel D, Bohl, Bryce A, Basques, Nicholas S, Golinvaux, Jason O, Toy, Erika A, Matheis, Brandon S, Bucklen, Jonathan N, Grauer   +6 more
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The attractive and repulsive forces on a lattice screw dislocation

Journal of Applied Physics, 1977
The properties of a lattice screw dislocation in a crystal in the form of a strip or a circular cylinder or an infinite crystal with a circualr hole or in a composite crystal composed of a soft matrix surrounded by a rigid second phase are determined. It is shown that the misfit stress field in the lattice is altered due to the image stress field. Some
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Extrusion forces of resorbable tacks and titanium screws in laryngeal chondrosynthesis

European Archives of Oto-Rhino-Laryngology, 2006
Laryngotracheal trauma, partial laryngectomy and phonosurgery may necessitate reconstruction of the cartilaginous skeleton to ensure the quality of respiration and voice. The present report focuses on initial experience gained with a new resorbable material for plates and tacks that allows chondrosynthesis of the laryngeal skeleton. A comparison of the
Norbert H, Kleinsasser, Peter J, Wild, J Carmelo, Pérez Alvarez, Till O, Seidler, Christian, Schurr, Katrin, Froelich, Tamás, Hacki, Ferdinand, Hofstaedter, Matthias A, Graf, Rudolf, Hagen   +9 more
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The Influence of the Insertion Technique on the Pullout Force of Pedicle Screws

Spine, 2010
The pullout strength of a typical pedicle screw was evaluated experimentally for different screw insertion techniques. OBJECTIVE.: To conclude whether the self-tapping insertion technique is indeed the optimum one for self-tapping screws, with respect to the pullout strength.It is reported in the literature that the size of the pilot-hole significantly
Chatzistergos, Panagiotis E., Sapkas, George, Kourkoulis, Stavros K.   +2 more
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Force on a screw dislocation in a multiphase laminated structure

Mathematics and Mechanics of Solids, 2013
The force on a screw dislocation in a multiphase laminated elastic structure is determined, both as an infinite integral and as a sum of multiple image terms. When the dislocation is near an interface, it is found that dislocation mobility is largely dependent on the ratio of the rigidities of the adjacent materials, and the perpendicular distance of ...
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