Results 31 to 40 of about 130,441 (138)

The effect of screw channel angulation on removal torque values and likelihood of screw loosening in dental implant-retained single crowns: A systematic review of in-vitro studies

, 2022
Angulated screw channels have become a useful technique in correcting angulation problems in screw-retained implant crowns. However, there may be an increased risk of screw loosening in these restorations when compared to restorations with axial screw ...
Cindy Zhou
core   +1 more source

The Mismatch Between Bony Endplates and Grafted Bone Increases Screw Loosening Risk for OLIF Patients With ALSR Fixation Biomechanically

Frontiers in Bioengineering and Biotechnology, 2022
The mismatch between bony endplates (BEPs) and grafted bone (GB) triggers several complications biomechanically. However, no published study has identified whether this factor increases the risk of screw loosening by deteriorating the local stress levels.
Jing-Chi Li, Tian-Hang Xie, Zhuang Zhang, Zhe-Tao Song, Yue-Ming Song, Jian-Cheng Zeng   +5 more
doaj   +1 more source

Evaluation the loosening of abutment screws in fluid contamination: an in vitro study

Scientific Reports, 2022
Screw loosening is one of the most common clinical problems of dental implants. Research on the influencing factors of screw loosening is very important to prevent screw loosening.
Fei Sun, Wei Cheng, Bao-hong Zhao, Gui-Qiu Song, Zeng Lin   +4 more
doaj   +1 more source

New approaches to proven technology: Force control posterior thoracolumbar fusion with an innovative pedicle screw system

Interdisciplinary Neurosurgery, 2023
Objective: Despite continuous advancements, posterior thoracolumbar fusion with pedicle screw systems (PSS) has failed to reduce the rate of reoperation over recent decades.
Yasser Abdalla, Shefqet Hajdari
doaj   +1 more source

Longitudinal Study on Pre- and Post-Operation CT Imaging for Predicting Pedicle Screw Loosening in Patients with Lumbar Degenerative Disease

Therapeutics and Clinical Risk Management
Qian Zhang,1– 3,* Fanfan Zhao,2,* Yu Zhang,3 Xiangyang Gong1,2 1Medical College of Soochow University, Suzhou, People’s Republic of China; 2Department of Radiology, Zhejiang Provincial People’s Hospital (Affiliated People’s Hospital), Hangzhou ...
Zhang Q, Zhao F, Zhang Y, Gong X
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Opportunistic Osteoporosis Screening Reveals Low Bone Density in Patients With Screw Loosening After Lumbar Semi-Rigid Instrumentation: A Case-Control Study

Frontiers in Endocrinology, 2021
ObjectiveDecreased bone mineral density (BMD) impairs screw purchase in trabecular bone and can cause screw loosening following spinal instrumentation.
Maximilian T. Löffler, Maximilian T. Löffler, Nico Sollmann, Nico Sollmann, Nico Sollmann, Egon Burian, Amirhossein Bayat, Kaywan Aftahy, Thomas Baum, Bernhard Meyer, Yu-Mi Ryang, Yu-Mi Ryang, Jan S. Kirschke, Jan S. Kirschke   +13 more
doaj   +1 more source

Pedicle screw loosening: the value of radiological imagings and the identification of risk factors assessed by extraction torque during screw removal surgery

Journal of Orthopaedic Surgery and Research, 2019
Background context Pedicle screw loosening is a common complication after spine surgeries. Traditionally, it was assessed by radiological approaches, both X-ray and CT (computed tomography) scan, while reports using mechanical method to study screw ...
Xiaoliang Wu, Jiawei Shi, Jinyan Wu, Yongquan Cheng, Kaiwen Peng, Jianting Chen, Hui Jiang   +6 more
doaj   +1 more source

Table5_Deterioration of the fixation segment’s stress distribution and the strength reduction of screw holding position together cause screw loosening in ALSR fixed OLIF patients with poor BMD.DOC

, 2022
The vertebral body’s Hounsfield unit (HU) value can credibly reflect patients’ bone mineral density (BMD). Given that poor bone-screw integration initially triggers screw loosening and regional differences in BMD and strength in the vertebral body exist,
Jing-Chi Li (10019642), Tian-Hang Xie (13522654), Zhe-Tao Song (13522657), Yue-Ming Song (13522660), Jian-Cheng Zeng (13522663), Zhi-Qiang Yang (1811902)   +5 more
core   +1 more source

Table6_Deterioration of the fixation segment’s stress distribution and the strength reduction of screw holding position together cause screw loosening in ALSR fixed OLIF patients with poor BMD.DOC

, 2022
The vertebral body’s Hounsfield unit (HU) value can credibly reflect patients’ bone mineral density (BMD). Given that poor bone-screw integration initially triggers screw loosening and regional differences in BMD and strength in the vertebral body exist,
Jing-Chi Li (10019642), Tian-Hang Xie (13522654), Zhe-Tao Song (13522657), Yue-Ming Song (13522660), Jian-Cheng Zeng (13522663), Zhi-Qiang Yang (1811902)   +5 more
core   +1 more source

Screw-Related Complications After Instrumentation of the Osteoporotic Spine: A Systematic Literature Review With Meta-Analysis

Global Spine Journal, 2020
Study Design: Systematic literature review with meta-analysis. Objective: Osteoporosis is common in elderly patients, who frequently suffer from spinal fractures or degenerative diseases and often require surgical treatment with spinal instrumentation ...
Elke Rometsch MSc, Maarten Spruit MD, PhD, Jack E. Zigler MD, Venugopal K. Menon MD, Jean A. Ouellet MD, Christian Mazel MD, Prof Dr med, Roger Härtl MD, Kathrin Espinoza MSc, Frank Kandziora MD, PhD, Prof Dr med   +8 more
doaj   +1 more source