نتایج جستجو برای: mechanical properties of cortical bone

تعداد نتایج: 21248540  

2016
Anna Szabelska Marcin R. Tatara Witold Krupski

BACKGROUND Among bones building the axial and appendicular skeleton, the mandible is characterized by unique morphological and functional traits. The aim of the study was to evaluate morphological, densitometric and mechanical properties of mandible in 5-month-old Polish Merino sheep. Using quantitative computed tomography, volumetric bone mineral density (vBMD) and calcium hydroxyapatite densi...

پایان نامه :0 1371

the treatment of in completely formed pulpless teeth has presented considrable problems. these teeth have wide open apexes and the walls of the root canal diverge toward the apical tissues. mechanical preparation cannot be done in the normal manner beacause of the large initial size and the taper of apical part of the canal , a mechanical stop cannot be produced at the apex of the canal and , t...

Journal: :The Journal of experimental biology 2007
Maureen J Devlin Daniel E Lieberman

Although mechanical loading can stimulate cortical bone growth, little is known about how individual physiology affects this response. This study demonstrates that in vivo variation in estradiol (E2) level alters osteoblast sensitivity to exercise-induced strains, affecting cortical bone responses to mechanical loading. Subadult sheep were divided into treatment groups that varied in terms of c...

Journal: :The Journal of bone and joint surgery. British volume 1991
M Sugimoto S Takahashi J Toguchida Y Kotoura Y Shibamoto T Yamamuro

We studied the effects of high-dose irradiation on the mechanical properties and morphology of cortical bone in rabbits for 52 weeks after a single dose of 50 Gy of electron-beam to the tibia. After four weeks, the bending strength of the irradiated bone was unchanged, but at 12 weeks, the strength had decreased significantly. At 24 weeks after irradiation mean strength was less than half of co...

Journal: :Journal of biomechanics 2010
Esther Cory Ara Nazarian Vahid Entezari Vartan Vartanians Ralph Müller Brian D Snyder

Mechanical testing has been regarded as the gold standard to investigate the effects of pathologies on the structure-function properties of the skeleton. With recent advances in computing power of personal computers, virtual alternatives to mechanical testing are gaining acceptance and use. We have previously introduced such a technique called structural rigidity analysis to assess mechanical s...

Journal: :archives of trauma research 0
sascha rausch department of traumatology, hand and reconstructive surgery, friedrich-schiller-universität jena, germany +49-3641322889, [email protected]; department of traumatology, hand and reconstructive surgery. friedrich-schiller-universität jena, jena, germany. tel.: +49-3641322889, fax: +49-36419322802 kajetan klos department of traumatology, hand and reconstructive surgery, friedrich-schiller-universität jena, germany +49-3641322889, [email protected] florian gras department of traumatology, hand and reconstructive surgery, friedrich-schiller-universität jena, germany +49-3641322889, [email protected] hristo kostov skulev arbeitsgemeinschaft für osteosynthesefragen, switzerland albrecht popp technical university of varna, bulgaria gunther olaf hofmann department of traumatology, hand and reconstructive surgery, friedrich-schiller-universität jena, germany +49-3641322889, [email protected]

conclusions the outside diameter/inside diameter ratio at the metaphyseal/diaphyseal junction of the distal radius on ap radiographs is suitable for use as a predictor of distal-radius bone density. further studies should be performed, and clinical utility evaluated. results the mean bmd was 0.559 (sd = 0.236) g / cm2. the mean outside diameter/inside diameter ratio was 1.24 (sd = 0.013); the r...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ولی عصر (عج) - رفسنجان - دانشکده ریاضی 1392

let h be a separable hilbert space and let b be the set of bessel sequences in h. by using several interesting results in operator theory we study some topological properties of frames and riesz bases by constructing a banach space structure on b. the convergence of a sequence of elements in b is de_ned and we determine whether important properties of the sequence is preserved under the con...

2012
S. Enoki M. Higashiura M. Sato K. Tanaka T. Katayama

The increase of patients with osteoporosis is a social problem. Osteoporosis decreases bone strength and increases the risk of fracture. The finding of prevention and treatment methods is an urgent issue. Since cancellous bone is metabolically more active than cortical bone, cancellous bone is used for diagnosis of osteoporosis. There are a lot of studies about stress analysis of cancellous bon...

Journal: :Experimental animals 2006
Jun Iwamoto Azusa Seki Tsuyoshi Takeda Yoshihiro Sato Harumoto Yamada James K Yeh

The purpose of the present study was to compare the effects of alendronate and alfacalcidol on cancellous and cortical bone mass and bone mechanical properties in ovariectomized rats. Twenty-six female Sprague-Dawley rats, 7 months of age, were randomized by the stratified weight method into four groups: the sham-operated control (Sham) group and the three ovariectomy (OVX) groups, namely, OVX ...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2015
J A D Garcia A L T Souza L H C Cruz P P Marques J A Camilli W R Nakagaki A Esteves W C Rossi-Junior G J M Fernandes F D Guerra E A Soares

The objective of this study was to verify the effects of ethanol consumption and alcohol detoxification on the biomechanics, area and thickness of cortical and trabecular bone in rat femur. This was an experimental study in which 18 male Wistar rats were used, with 40 days of age, weighing 179 ± 2.5 g. The rats were divided into three groups (n=06): CT (control), AC (chronic alcoholic), DT (det...

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