Results 91 to 100 of about 4,946 (135)

Occipital Screw Pullout Strength

Spine, 1999
A three-group design with consistent pullout strength measures.To determine pullout strength of three fixation types (unicortical screws, bicortical screws, wires) and to investigate their correlation with respect to occipital morphology.A secured, multidirectional occipitocervical fusion requires internal fixation.
T R, Haher, A W, Yeung, S A, Caruso, A A, Merola, T, Shin, R I, Zipnick, J M, Gorup, C, Bono   +7 more
openaire   +2 more sources

Pullout strength of adaption screws in thyroid cartilage

American Journal of Otolaryngology, 1998
To determine the pullout strength of adaption screws in laryngeal cartilage and its relationship to drill hole and screw diameter.Screw pullout strength in human cadaver thyroid cartilage was measured using a load cell. Screw sizes of 1.3, 1.5, and 2.0 mm were tested using drill hole diameters of 0.76, 1.1, and 1.5 mm.Maximum pullout strength was ...
R L, Plant, E F, Pinczower
openaire   +2 more sources

Biomechanical Evaluation of the Pullout Strength of Cervical Screws

Journal of Spinal Disorders & Techniques, 2005
In the process of anterior cervical fusion, little is known about the biomechanics of anterior cervical screw pullout. In this study, three different aspects of cervical screw fixation were evaluated: self-tapping (ST) versus self-drilling (SD) screws, the effect of screw geometry (length, diameter, thread pitch), and the use of rescue screws.Nine ...
Bryan P, Conrad, Andrew G, Cordista, MaryBeth, Horodyski, Glenn R, Rechtine   +3 more
openaire   +2 more sources

A Comparison of Screw Insertion Torque and Pullout Strength

Journal of Orthopaedic Trauma, 2010
Pullout strength of screws is a parameter used to evaluate plate screw fixation strength. However, screw fixation strength may be more closely related to its ability to generate sufficient insertion because stable nonlocked plate-screw fracture fixation requires sufficient compression between plate and bone such that no motion occurs between the plate ...
William M, Ricci, Paul, Tornetta, Timothy, Petteys, Darin, Gerlach, Jacob, Cartner, Zakiyyah, Walker, Thomas A, Russell   +6 more
openaire   +2 more sources

Evaluation of Cyanoacrylate Augmentation of Transpedicular Screw Pullout Strength

Journal of Spinal Disorders & Techniques, 2005
Pedicle screw fixation of osteoporotic bone in the elderly is a challenge. Various augmentation methods have been studied by many authors. Although polymethylmethacrylate (PMMA) augmentation is believed to be a standard method, its usage is fraught with complications. Butyl-2-cyanoacrylate is an alternative to PMMA as it is bioresorbable, biocompatible,
Milcan, A, Zeren, ADALET, Ayan, I, Yilmaz, A, Kuyurtar, F, Sinmazcelik, TAMER, Zeren, MUZAFFER   +6 more
openaire   +3 more sources

Concrete Strength Based on Maturity and Pullout

Journal of Structural Engineering, 1984
An experimental investigation was undertaken to determine the effect of two curing environments on the development of relationships between pullout strength, compressive strength and the maturity of concrete. For the one batch of concrete used and the curing environments chosen, the following significant conclusions resulted from the investigation: (1)
Ronald L. Dilly, William B. Ledbetter
openaire   +1 more source

On In-Place Strength of Concrete and Pullout Tests

Cement, Concrete, and Aggregates, 1984
Abstract The current status of in-place strength evaluation of concrete is discussed. A literature survey regarding the controversy surrounding the assessment of concrete strength through field-cast laboratory-cured cylinder tests is presented.
M Yener, W-F Chen
openaire   +1 more source

Pullout strength of a biodegradable free form osteosynthesis plate

Journal of Cranio-Maxillofacial Surgery, 2010
The Inion(®) Free Form Plate is a newly designed biodegradable plate. After drilling through the plate and tapping, a biodegradable screw can be inserted, followed by removal of the screw head. As an alternative a countersink screw can be used. Aim of the study was to compare the mechanical properties of the 1.4 mm Free Form Plate with the 2.0 mm ...
Siegfried, Jank, Petteri, Väänänen, Frank R, Kloss, Janne T, Nurmi, Juha-Pekka, Nuutinen, Sanna, Jakonen, Harri, Happonen   +6 more
openaire   +2 more sources

Pullout Strengths of Cannulated and Noncannulated Cancellous Bone Screws

Clinical Orthopaedics and Related Research, 1997
The pullout strengths of large diameter cannulated and noncannulated cancellous screws were tested in a synthetic polyurethane foam. The foam was fabricated to have mechanical properties equivalent to human cancellous bone and was characterized by compression testing before screw pullout.
J D, Thompson, J B, Benjamin, J A, Szivek   +2 more
openaire   +2 more sources

Factors Affecting the Pullout Strength of Cancellous Bone Screws

Journal of Biomechanical Engineering, 1996
Screws placed into cancellous bone in orthopedic surgical applications, such as fixation of fractures of the femoral neck or the lumbar spine, can be subjected to high loads. Screw pullout is a possibility, especially if low density osteoporotic bone is encountered. The overall goal of this study was to determine how screw thread geometry, tapping, and
J R, Chapman, R M, Harrington, K M, Lee, P A, Anderson, A F, Tencer, D, Kowalski   +5 more
openaire   +2 more sources