Results 71 to 80 of about 130,441 (138)

Computed tomography-derived Hounsfield unit mapping for pedicle screw planning in degenerative lumbar disease: a narrative review [PDF]

Asian Spine Journal
Pedicle screw loosening is a common and clinically significant complication of instrumented lumbar fusion and is reported in 15%–30% of screws in osteoporotic patients.
Shabir Ahmed Dhar, Reyaz Ahmed Dar, Tarsem Lal Motten, Tahir Ahmad Dar, Sabqat Farooq, Abdul Maajid, Asim Maqbool   +6 more
doaj   +1 more source

Sem and Fractography Analysis of Screw Thread Loosening in Dental Implants

, 2007
Biological and technical failures of implants have already been reported. Mechanical factors are certainly of importance in implant failures, even if their exact nature has not yet been established.
M. Quaranta, A. Scarano, A. Piattelli, T. Traini, M. Piattelli   +4 more
core   +1 more source

Bolt loosening evaluation method based on normalized screw root equivalent stress and loosening life curve

Scientific Reports
Bolts are subject to complex loads and prone to loosening failure in transverse random service environments. To establish a loosening life evaluation method applicable to different types of bolts, numerous bolt clamping-force recession curves were ...
Guangwu Yang, Han Zhao, Long Yang, Wenyang Shao, Shoune Xiao, Tao Zhu, Yuqing Yuan   +6 more
doaj   +1 more source

Analytical and Experimental Investigation of Self-Loosening of Preloaded Cap Screw Fasteners

, 2011
In an effort to establish a theoretical outline of a criterion for preventing the vibration-induced loosening of preloaded threaded fasteners, this paper provides an experimental and analytical insight into the effect of the initial bolt preload and the ...
Sayed Nassar, Xianjie Yang
core   +1 more source

Correlation Between Microleakage And Screw Loosening At Implant-Abutment Connection

, 2014
PURPOSE This study aimed to evaluate the correlation between microleakage and screw loosening at different types of implant-abutment connections and/or geometries measuring the torque values before and after the leakage tests. MATERIALS AND METHODS Three
Ayyildiz, Simel, Sahin, Cem
core   +2 more sources

TREATMENT OF SCREW LOOSENING IN THE SPINE

['UNSDG 3: Good Health and Well-being (https://sdgs.un.org/goals/goal3)']Viable, Healthy and Safe CommunitiesPedicle screws have been used in many surgeries including those treating issues such as spinal fractures, spinal tumors, and ...
Yacoub, Lana
core   +1 more source

A novel anti-loosening bolt looseness diagnosis of bolt connections using a vision-based technique

Scientific Reports
Bolt looseness detection is a common problem in engineering. Most vision-based detection techniques focus on diagnosing ordinary bolt looseness, i.e., the methods used for diagnosis are based only on the sidelines of nuts.
Jun Luo, Kaili Li, ChengQian Xie, Zhitao Yan, Feng Li, Xiaogang Jia, Yuanlai Wang   +6 more
doaj   +1 more source

Effects of Screw Fastening Sequence to Top Cover Loosening in Hard Disk Drive Assembly

, 2011
In hard disk drive assembly process, a number of small screws around the perimeter of the top cover are used to attach the top cover to the base. When one of the screws is fastened, screw loosening at the other screw heads can frequently be observed ...
Kampol Suknikhom, Surachate Chutima, Thoatsanope Kamnerdtong, Pattaramon Jongpradist   +3 more
core   +1 more source

Evaluation of screw pull-out from plate fixation of en bloc distal radius resection with ulnar reconstruction: Finite element analysis and comparison with experiments on Thiel cadavers

APL Bioengineering
Fractures of the distal radius often require surgical intervention, with plate fixation being a standard stabilization method. Screw loosening and pull-out propose significant complications, necessitating comprehensive understanding of fixation stability
Wares Chancharoen, Theingi Nwe, Saran Seehanam, Napawan Taradolpisut, Thewarid Berkband, Thanapon Chobpenthai, Chavin Jongwannasiri, Laphatrada Yurasakpong   +7 more
doaj   +1 more source

Impact of screw tip design on screw anchorage: mechanical testing and numerical simulation

Journal of Orthopaedic Surgery and Research
Background Screw loosening is a commonly reported issue following spinal screw fixation and can lead to various complications. The initial cause of screw loosening is biomechanical deterioration.
Shiming Xie, Liqiang Cui, Jinhui Liu, Peidong Qing, Jingchi Li   +4 more
doaj   +1 more source