Results 251 to 260 of about 17,578 (277)
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Pullout Performance of Self-Tapping Medical Screws
Journal of Biomechanical Engineering, 2011This study investigates the effect of the pilot hole size, implant depth, synthetic bone density, and screw size on the pullout strength of the self-tapping screw using analytical, finite element, and experimental methodologies. Stress distribution and failure propagation mode around the implant thread zone are also investigated.
Zhijun, Wu +2 more
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Self-Drilling and Self-Tapping Screws
Journal of Craniofacial Surgery, 2010The aim of the current study was to compare self-drilling and self-tapping screws with regard to bone contact and the production of bone debris using scanning electron microscopy.Three New Zealand rabbit calvariae were used. Self-tapping and self-drilling screws were inserted into the outer surface of the skull with and without saline solution ...
Juliana Gonçalves, Goelzer +5 more
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Group effects in axially loaded self-tapping screw connections
Engineering Structures, 2022Abstract Connections using self-tapping screws are frequently used in modern timber construction, with screws often assembled in groups to resist large loads. Load carrying capacity and stiffness are maximized when screws are loaded parallel to the screw axis in withdrawal.
Tom Joyce, Ying Hei Chui
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1999
The invention pertains to a screw produced by cold rolling, designed to be screwed into plastic material, and having a self tapping thread, the fillets (3) of which are formed, in a sectional view, like a knife blade. The fillet flank surface (6, 8) features an inward curve (5) in its central third and forms an outer thread flank angle ( alpha ) of ...
EJOT VERBINDUNGSTECH GMBH & CO +2 more
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The invention pertains to a screw produced by cold rolling, designed to be screwed into plastic material, and having a self tapping thread, the fillets (3) of which are formed, in a sectional view, like a knife blade. The fillet flank surface (6, 8) features an inward curve (5) in its central third and forms an outer thread flank angle ( alpha ) of ...
EJOT VERBINDUNGSTECH GMBH & CO +2 more
openaire +2 more sources
[Research on Self-tapping Performance Test of Self-tapping Bone Screws].
Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation, 2022To study the self-tapping performance test method of self-tapping bone screws based on the YY/T 1505 standard.With reference to the method of YY/T 1505, various factors affecting the self-tapping force test was optimised, and the self-tapping force judgment method was improved.The experimental results showed that the self-tapping force obtained by the ...
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Pullout Strength of Self-Tapping Screws Inserted to Different Depths
Journal of Orthopaedic Trauma, 2005The purpose of this study was to determine whether the depth of insertion through the far cortex of self-tapping screws significantly affects pullout strength.Fifty, Synthes, 3.5-mm, self-tapping screws were inserted into synthetic bone blocks and divided into 5 groups. Group 1 had screws with their tips inserted 1 mm short of the far cortex.
Robert, Berkowitz +2 more
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Clinical Orthopaedics and Related Research, 1981
The heads of self-tapping and non-self-tapping screws in dog femurs were exposed to a cyclic shearing force of 110 N for 200 loading cycles. This cyclic shear loading created a decrease in pull-out strength for both screw types of approximately 11% (p less than 0.01).
C T, Vangsness +2 more
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The heads of self-tapping and non-self-tapping screws in dog femurs were exposed to a cyclic shearing force of 110 N for 200 loading cycles. This cyclic shear loading created a decrease in pull-out strength for both screw types of approximately 11% (p less than 0.01).
C T, Vangsness +2 more
openaire +2 more sources
Self-Tapping Screw Performance in Aluminum-Steel Joints
Volume 2: Advanced Manufacturing, 2016Over the last few decades, lightweight material joints including plastics, aluminum, magnesium and various composites have been widely used in many mechanical and structural applications such as automotive, aircraft and so on, for their high strength-to-weight ratio and the significant improvement for the fuel economy and energy efficiency.
Zhijun Wu +3 more
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Analysis of the osseous/metal interface of drill free screws and self-tapping screws
Journal of Cranio-Maxillofacial Surgery, 2001Aim: A comparison of metal/osseous interface and bone remodelling after insertion of different types of titanium bone screws in vivo. Material: Samples of five of each of the following bone screw types were inserted into the anterior wall of the frontal sinus of five Göttingen minipigs: self-tapping micro- (1.5 mm) and miniscrews (2.0 mm) or drill free
W, Heidemann, H, Terheyden, K L, Gerlach
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Theoretical modelling of the self-tapping screw fastening process
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2001The results of a theoretical study of the self-tapping screw insertion process are presented. Fundamental concepts of engineering mechanics are employed to analyse the axial torque required to complete a general self-tapping screw insertion operation.
Seneviratne, L D +3 more
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