scholarly journals Biomechanical properties of the rectovaginal fascia. Is it really a fascia?

2011 ◽  
Vol 25 (1) ◽  
pp. 11
Author(s):  
Karin Glavind ◽  
Janus Bo Jespersen ◽  
Mikkel Seyer-Hansen
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Mechanical Testing ◽  
Biomechanical Properties ◽  
Abdominal Hysterectomy ◽  
Collagen Content ◽  
Significant Difference ◽  
Testing And Measurement ◽  
Abdominal Fascia

<em>Background</em>. The aim of this study was to find out whether the rectovaginal fascia was really a true fascia by comparing the mechanical properties and collagen content of the rectovaginal fascia in women operated for rectoceles to the abdominal fascia in patients having an abdominal hysterectomy. <em>Materials and Methods</em>. Thirty patients were included. During operation for rectocele or hysterectomy a biopsy measuring 8 x 15 mm was taken from the rectovaginal fascia or abdominal fascia. Mechanical testing and measurement of collagen content was performed. <em>Results</em>. A significant difference in mechanical strength of the tissue was found. If, however, the strength was corrected for collagen content there was no difference between the two groups. <em>Conclusion</em>. The quality of collagen was comparable in the two groups. This adds further evidence to the existence of a distinct rectovaginal fascia.

Chemical Composition and Mechanical Properties of Bio-Derived Compact Bone Scaffolds

2006 ◽  
Vol 309-311 ◽  
pp. 891-894 ◽  
Author(s):  
Ting Wu Qin ◽  
Zhi Ming Yang ◽  
Xiang Tao Mo ◽  
Jing Cong Luo ◽  
Li Deng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heavy Metal ◽  
Chemical Composition ◽  
Compact Bone ◽  
Biomechanical Properties ◽  
Collagen Protein ◽  
Significant Difference ◽  
Calcium Phosphorus ◽  
And Control ◽  
Physical And Chemical

To compare the chemical composition and mechanical properties of the bio-derived compact bone scaffold (BDCBS) with the normal compact bone in human. Human compact bone were harvested and divided into control and experimental group. For the latter, BDCBS was prepared with physical and chemical methods. The major components (calcium, phosphorus, collagen protein) and heavy metal contents of the two groups were determined with biochemical assay. Histological examinations were performed to investigate the structure. Cylindroids from the normal compact bone and the BDCBS (6 in each group) were tested under compression. There was no significant difference between the two groups for major components. In addition, there were a few amounts of heavy metal components in BDCBS and control. Histological examinations confirmed the acellular structure in the BDCBS. Results from mechanical testing showed the compressive strength, elastic modulus and ultimate strain (193MPa, 13.76GPa, and 2.3%) of the BDCBS were a bit lower than those (205MPa, 15.67GPa, and 2.5% respectively) of control, but the differences were not statistically significant. In conclusion, there are almost the same matrix structure and composition with similar biomechanical properties between the BDCBS and the control. These results may underscore the potential of the BDCBS in tissue engineering bone.

Changes in the biomechanical properties of skin and aorta induced by corticotrophin treatment

1980 ◽  
Vol 94 (1) ◽  
pp. 132-137 ◽  
Author(s):  
H. Oxlund
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Connective Tissue ◽  
Thoracic Aorta ◽  
Aortic Wall ◽  
Biomechanical Properties ◽  
Elastic Stiffness ◽  
Collagen Content ◽  
Dorsal Skin ◽  
Biophysical Properties

Abstract. The work presented here is an investigation of the effect of elevated levels of corticosteroids on the biophysical properties of skin, aorta and muscle tendon. Rats were given corticotrophin injections for 10, 30 and 60 days to elevate the level of plasma endogenous corticosteroids. The corticotrophin treatments did not change the water or collagen content of specimens from dorsal skin, thoracic aorta and peroneal muscle tendons, tested mechanically. Changes became evident after longer treatment times. For both skin and aorta, the tensile strength, elastic stiffness and failure energy were increased after 60 days of treatment. The corticotrophin treatment did not influence the mechanical properties of muscle tendons. Complete reversibility of changes in the mechanical properties induced by 30 days of corticotrophin treatment was found after an additional period of 30 days of saline injections. This study indicates that an increased level of plasma corticosteroids elicited by corticotrophin treatment may increase the stiffness of the connective tissue of the organism. In the aorta this results in loss of capacitive function with increased haemodynamic strain on the aortic wall.

Mechanical Strength of Scaphoid Fixation

1996 ◽  
Vol 21 (1) ◽  
pp. 99-102 ◽  
Author(s):  
M. L. NEWPORT ◽  
C. D. WILLIAMS ◽  
W. D. BRADLEY
Keyword(s):  
Mechanical Strength ◽  
Failure Mode ◽  
Biomechanical Properties ◽  
Failure Strength ◽  
Cannulated Screws ◽  
Compression Screw ◽  
Universal Compression ◽  
Significant Difference ◽  
Ultimate Failure ◽  
Cantilever Bending

We have investigated five devices suitable for scaphoid fixation (ASIF 2.7 mm and 3.5 mm cannulated screws, Herbert, Herbert-Whipple, and Howmedica Universal Compression Screw). The biomechanical properties tested were compression and resistance to cantilever bending. There was no statistically significant difference in compression between devices. There were significant differences in resistance to cantilever bending, with the Howmedica screw being strongest in both failure mode and in ultimate failure strength.

Effect of Porosity on Mechanical Properties of Ti-5Al-2.5Sn ELI Alloy from Atomized Powder

2015 ◽  
Vol 817 ◽  
pp. 587-592 ◽  
Author(s):  
Lei Xu ◽  
Rui Peng Guo ◽  
Rui Yang
Keyword(s):  
Mechanical Properties ◽  
Hot Isostatic Pressing ◽  
Cryogenic Temperatures ◽  
Significant Difference ◽  
Complex Shapes ◽  
Near Net Shape ◽  
Net Shape Forming ◽  
Near Net Shaping ◽  
Net Shaping

Ti-5Al-2.5Sn ELI alloy is a typical α titanium, which is widely used at cryogenic temperatures. Hot isostatic pressing (HIPing) is a common technology to fabricate powder metallurgy (P/M) titanium alloys and components. Porosity control is very crucial for P/M alloys during application, and porosity will deteriorate mechanical properties of P/M alloys. In this study, porosity caused by HIPing process has been investigated. Effects of porosity on metallurgy quality of P/M Ti-5Al-2.5Sn ELI alloy have been accessed. The results showed that when porosity levels was less than 0.6%, no significant difference was found comparing with full dense P/M Ti-5Al-2.5Sn ELI alloy. Near-net-shape forming processes of P/M titanium alloy parts ware studied. By using metal capsules and metal internal tooling, near-net-shaping of P/M parts with complex shapes was demonstrated.

BIOMECHANICAL PROPERTIES OF MESHES FOLLOWING IMPLANTATION IN THE RAT ABDOMINAL WALL MODEL

2016 ◽  
Vol 16 (03) ◽  
pp. 1650036
Author(s):  
NATASHA UDPA ◽  
SHAMA IYER ◽  
SEAN P. MCDONOUGH ◽  
YINGXIN GAO
Keyword(s):  
Mechanical Strength ◽  
Abdominal Wall ◽  
Polypropylene Mesh ◽  
Biomechanical Properties ◽  
Uniaxial Tensile ◽  
Collagen Deposition ◽  
Collagen Types ◽  
Wall Model ◽  
Uniaxial Tensile Testing ◽  
Significant Difference

The objective of our study was to (1) evaluate mesh strength and collagen incorporation after 4 and 12 weeks of implantation in a rat abdominal wall model and (2) determine the relationship between collagen deposition and mechanical strength of a chitosan-coated polypropylene mesh. We implanted 0.5% chitosan-coated polypropylene mesh (PPM), collagen-coated PPM (PelvitexTM; C.R. Bard), and PPM (Avaulta Solo[Formula: see text]; C.R. Bard) using a rat abdominal defect model. Mechanical properties were determined from uniaxial tensile testing and collagen deposition of each mesh was evaluated 4 and 12 weeks post-implantation. We found that after implantation, the neo tissue of Ch-PPM is stiffer than the commercially available meshes. We also observed no significant difference in the ratio of collagen types I/III between mesh samples at 4 weeks or 12 weeks. We found no relationship between the ratio of collagen types I/III and the mechanical strength of mesh samples after implantation. The increased stiffness with chitosan coating could be due to increased muscle tissue ingrowth.

Biomechanical changes of freezer-storaged and decellularized pig tracheal scaffoldings

2021 ◽  
pp. 088532822098566
Author(s):  
Jinping Wang ◽  
Haixiang Zhang ◽  
Yangmeng Feng ◽  
Yang Sun ◽  
Ruina Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Testing Machine ◽  
Biomechanical Properties ◽  
Universal Testing ◽  
Significant Difference ◽  
Group A ◽  
Biomechanical Changes ◽  
Group B ◽  
Group D

Background As an excellent xenotransplant, the pig trachea can be decellularized and cryopreserved to reduce its immunogenicity. However, few reports are found on the changes of its mechanical properties after cryopreservation and decellularization. Objective To evaluate the structure and biomechanical properties in pig tracheal scaffolds resulting from decellularized and cryopreserved. Material and methods Twenty-five pig tracheal segments were separated into five groups: untreated (group A), only decellularized (group B), only cryopreserved (group C), decellularized after cryopreserved (group D) and cryopreserved after decellularized (group E). Tracheal segments were subjected to uniaxial tension or compression using a universal testing machine to determine structural biomechanical changes. Results It showed that there was no statistically significant difference in the tensile strength of the trachea in each group. The compressive strength of group B, C and D were same as the group A ( P > 0.05), while the group E was lower than that of the group A ( P < 0.05). Conclusions and significance: The histological examination of the decellularization after cryopreservation shows that the removal of epithelial cells and submucosal cells is more thorough, and the biomechanical structure of the trachea is better preserved. This proved to be a new method to prepare xenotransplantation of trachea graft.

Biomechanical Properties of the Condyle Created by Osteodistraction

2008 ◽  
Vol 87 (5) ◽  
pp. 490-494 ◽  
Author(s):  
S. Zhu ◽  
J. Hu ◽  
S. Zou ◽  
K. Kakudo ◽  
M. Tsunokuma
Keyword(s):  
Mechanical Properties ◽  
Mechanical Testing ◽  
Cancellous Bone ◽  
Biomechanical Properties ◽  
Microcomputed Tomography ◽  
Histological Features ◽  
Reach Control ◽  
The Right ◽  
Functional Loading

A new condyle can be reconstructed by osteodistraction, but the biomechanical properties of the neocondyle remain unknown. This study examined the hypothesis that the biomechanical properties of neocondylar cancellous bone could reach control levels 24 weeks after its creation by osteodistraction. The right mandibular condyles were removed and reconstructed by osteo-distraction in 16 adult goats. Their contralateral condyles served as controls. Microstructural and mechanical properties were examined by microcomputed tomography and mechanical testing. At 24 weeks after distraction, the neocondyle grew larger in size, but the shape and histological features were similar to those of the controls. The cancellous bone of the neocondyle even appeared to be more dense and stiffer in comparison with the control condyle. The results of this study suggest that the neocondyle created by osteodistraction develops nearly normal biomechanical properties for functional loading by 24 weeks after creation.

THE EFFECT OF FREEZING ON BIOMECHANICAL PROPERTIES OF THE CARPAL TUNNEL SUBSYNOVIAL CONNECTIVE TISSUE

2015 ◽  
Vol 18 (04) ◽  
pp. 1550019 ◽  
Author(s):  
Anika Filius ◽  
Andrew Thoreson ◽  
Abhishek Dharan ◽  
Kristin Mara ◽  
Kai-Nan An ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Connective Tissue ◽  
Mechanical Testing ◽  
Carpal Tunnel ◽  
Repeated Measures ◽  
Damage Threshold ◽  
Biomechanical Properties ◽  
Fresh Frozen ◽  
Tunnel Syndrome ◽  
Subsynovial Connective Tissue

Biomechanical evaluation of the subsynovial connective tissue (SSCT) provides insight into the causes of carpal tunnel syndrome. Studies of carpal tunnel mechanics have been performed using fresh-frozen cadaver tissue. Freezing can affect mechanical properties of some tissues, but its effect on SSCT is unknown. A total of 16 rabbit paws were harvested from eight New Zealand rabbits and subjected to mechanical testing consisting of three repeated tendon excursions in sets of three different excursion magnitudes. One paw from each animal was unfrozen. The contralateral paw was frozen and thawed before testing. Force, energy and stiffness of the first cycle of each set were evaluated, as were ratios of the second to first cycle for each parameter. Two-factor ANOVA with repeated measures over both factors was performed. No significant interactions between factors were found. There were no significant differences between fresh and frozen paws for any parameters, though there were significant differences between excursion amplitudes. The damage threshold was not different between fresh and frozen paws. This study demonstrated that freezing rabbit subsynovial connective tissue does not significantly change its mechanical properties. The same may be true for human cadaver tissues. Results of cadaver mechanical testing may not be influenced by this preservation technique.

scholarly journals Performance Analysis of Colored PLA Products with a Fused Filament Fabrication Process

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1984 ◽  
Author(s):  
Roberto Spina
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Performance Analysis ◽  
Processing Parameters ◽  
Fused Filament Fabrication ◽  
Scanning Calorimetry ◽  
Experimental Activity ◽  
Significant Difference ◽  
Thermal Measurements

The objective of the present work is to study the influence of color additives used for the polylactic acid (PLA) filament on the final quality of fused filament fabrication (FFF) parts. The main processing parameters of FFF parts were evaluated, identifying the significant correlations between PLA properties and part performance, using a commercial FFF machine. The quality of the products was evaluated in terms of thermo-mechanical properties such as mechanical strength, principal material temperatures, and viscosity. These last properties were characterized using differential scanning calorimetry (DSC) for the thermal measurements and a rotational rheometry (RHEO) for viscosity measurements. Cylindrical specimens were then produced for the compression test. The experimental activity and related testing of products are fully described, pointing out a significant difference in performance between parts made of different colored filaments.

scholarly journals The Effect of Curing Pressure and Duration on Mechanical Strength of Ultrahigh Molecular Weight Polyethylene/High-Density Polyethylene Composite as An Alternative Material for Windmill Turbine

Rekayasa ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 219-224
Author(s):  
Febrianti Nurul Hidayah ◽  
Johan Boss
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Mechanical Strength ◽  
High Density Polyethylene ◽  
Bending Strength ◽  
Minimum Weight ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
High Density ◽  
Significant Difference ◽  
Ultrahigh Molecular Weight

The use of steel in building or construction manufacture continues to decrease, owing in part to the sustainability and mechanical properties of fibers which have higher strength in minimum weight than steel. This preliminary study was defined to evaluate the mechanical properties of high-performance fibers, especially ultrahigh molecular weight polyethylene (UHMWPE), in terms of the composite to be the main material of windmill turbines. It was UHMWPE as reinforcement and high-density polyethylene (HDPE) as a matrix in this composite system. The composites were processed in a variety of pressure and duration (50 to 165 bar and 10 minutes to 48 hours). The mechanical strength was tested by 3-point bending tests to measure the interlaminar shear strength, shear modulus, and bending strength. The result showed a significant difference in properties of the composite which is higher pressure and longer duration obtained a higher value of mechanical strength.

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