Fracture rate dependency of an adhesive under dynamic loading

Background: Peripheral artery disease (PAD) affecting the femoropopliteal artery is treated by endovascular interventions [2, 5, 13] increasingly. Aim of the study was to evaluate mid-term efficacy and patency of long stents in the superficial femoral and popliteal artery. Patients and methods: Between September 2006 and September 2007 103 patients received 128 stents for endovascular treatment of femoropopliteal vascular stenosis or occlusion. Clinical and hemodynamic parameters were collected. Risk factors, popliteal involvement and TASC classification, were documented and evaluated. Results: Immediate outcome was satisfactory with a technical success rate of 100 %. After a mean follow-up period of 21 months, primary patency was 83.6 %. Potential risk factor analysis for restenosis and fracture demonstrated hypertension to have borderline significance (P = 0.06). In normotensive patients no restenosis occurred. Further pre-conditions, e.g. smoking, metabolic syndrome, age, gender and previous intervention did not show any influence on restenosis or stent fracture. TASC C and D lesion had similar patency rates compared to TASC A and B lesions. Most of the restenoses (13 out of 16) were observed within the first six months of follow-up. Six stent fracture were observed (4.7 %). Conclusions: Long stents had convincing results after endovascular treatment of the femoropopliteal PAD. The used stent was an efficacious endovascular tool for long athersclerotic lesions in the superficial femoral and popliteal artery. Fracture rate was low with an incidence of 4.7 %. Most restenoses occurred within the first six months so that careful follow-up would be necessary.

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MODES OF FAILURE OF MATERIALS UNDER THE DYNAMIC LOADING

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1988342 ◽

1988 ◽

Vol 49 (C3) ◽

pp. C3-295-C3-299

Author(s):

J. SUVOROVA

Keyword(s):

Dynamic Loading ◽

Modes Of Failure

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Male Osteoporosis

Osteologie/Osteology ◽

10.1055/s-0038-1630136 ◽

2013 ◽

Vol 22 (04) ◽

pp. 260-266 ◽

Cited By ~ 2

Author(s):

S. P. Tuck ◽

R. M. Francis ◽

B. C. Hanusch

Keyword(s):

Prostate Cancer ◽

Older Men ◽

Good Evidence ◽

Male Osteoporosis ◽

Fracture Rate ◽

Common Cause ◽

Increased Risk ◽

Osteoporosis In Men ◽

Considerable Morbidity ◽

Secondary Causes

SummaryMale osteoporosis is common and results in considerable morbidity and mortality. There are distinct differences in the normal aging of bone between the genders, which result in a lower fracture rate in men. Men who suffer from osteoporosis are much more likely than women to have secondary causes. The identification and treatment of these secondary causes, wherever possible, will result in substantial improvements in BMD. There is now evidence for use of many of the existing agents to treat osteoporosis in men. In younger hypogonadal men testosterone replacement is worth considering, but in older men especially the over sixties this is less effective and there is an increased risk of adverse cardiovascular and prostatic outcomes. Prostate cancer is an increasingly common cause, which is partially the result of the success of ADT. There is now good evidence for the use of bisphosphonates and denosumab in this group of patients. HIV, whilst not being specific to men, is an increasingly recognised cause of male osteoporosis. The reasons for this are multifactorial and some may well be attributable to the anti-retroviral therapy itself. There is emerging evidence of an increased fracture risk in HIV infected individuals. The bone loss can be prevented by the use of bisphosphonates.

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Response of an HMX Based Explosive to Dynamic Loading by the Hopkinson Split Bar Technique

Физика горения и взрыва ◽

10.15372/fgv20160414 ◽

2016 ◽

Keyword(s):

Dynamic Loading

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Reverse torque values of abutment screws after dynamic loading: The effects of sealant agents and the taper of conical connections

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-19-00228 ◽

2020 ◽

Author(s):

Arda Ozdiler ◽

suleyman dayan ◽

Burc Gencel ◽

Gulbahar Isık-Ozkol

Keyword(s):

Dynamic Loading ◽

Antibacterial Agent ◽

In Vitro Study ◽

Control Group ◽

Silicone Sealant ◽

Reverse Torque ◽

The Stability ◽

Torque Values ◽

Chlorhexidine Gel

This in vitro study evaluated the influence of taper angles on the internal conical connections of implant systems and of the application of chlorhexidine gel as an antibacterial agent or a polyvinyl siloxane (PVS) sealant on the reverse torque values of abutment screws after dynamic loading. The current study tested four implant systems with different taper angles (5.4°, 12°, 45°, and 60°). Specimens were divided into three groups: control (neither chlorhexidine gel filled nor silicone sealed), 2% chlorhexidine gel-filled or silicone-sealed group, and group subjected to a dynamic load of 50 N at 1 Hz for 500,000 cycles prior to reverse torque measurements. Quantitative positive correlation was observed between the taper angle degree and the percentage of tightening torque loss. However, this correlation was significant only for the 60° connection groups except in the group in which a sealant was applied ( p = 0.013 for the control group, p = 0.007 for the chlorhexidine group). Percentages of decrease in the torque values of the specimens with silicone sealant application were significantly higher compared with both the control and chlorhexidine groups ( p = 0.001, p = 0.002, p = 0.001, and p = 0.002, respectively, according to the increasing taper angles); the percentage of decrease in torque values due to chlorhexidine application was statistically insignificant when compared with the control group. The application of gel-form chlorhexidine as an antibacterial agent does not significantly affect the stability of the implant–abutment connection under dynamic loads. PVS sealants may cause screw loosening under functional loads.

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