نتایج جستجو برای: cortical bone
تعداد نتایج: 403437 فیلتر نتایج به سال:
CONTEXT AND OBJECTIVE Weight-bearing exercise during growth exerts positive effects on the skeleton. Our objective was to test the hypothesis that long-term elite rhythmic gymnastics exerts positive effects on volumetric bone mineral density and geometry and to determine whether exercise-induced bone adaptation is associated with increased periosteal bone formation or medullary contraction usin...
PURPOSE The inter-relationships between various implant and bone parameters were evaluated for their influence on the von Mises stress distribution within the mandible using the finite element procedure. The maximum compressive stresses in cancellous and cortical bone were compared to the published stress-strain data to determine bone fracturing status when the maximum (traumatic) loading is ap...
This study evaluated the biomechanical influence of apical bone anchorage on a single subcrestal dental implant using three-dimensional finite element analysis (FEA). Four different bone anchorage designs were simulated on a posterior maxillary segment using one implant with platform switching and internal Morse taper connection as follows: 2 mm subcrestal placement with (SW) or without (SO) th...
Alteration of the geometrical surface configuration of cortical bone allografts may improve incorporation into host bone. A porous biodegradable coating that would maintain immediate structural recovery and subsequently allow normal graft healing and remodeling by promoting bony ingrowth could provide an osteoconductive surface scaffold. We investigated the feasibility of augmenting cortical bo...
Glucocorticoid excess is a major cause of low bone mass and fractures. Glucocorticoid administration decreases cortical thickness and increases cortical porosity in mice, and these changes are associated with increased osteoclast number at the endocortical surface. Receptor activator of NF-κB ligand (RANKL) produced by osteocytes is required for osteoclast formation in cancellous bone as well a...
PURPOSE Histomorphometry and microhardness measurements were performed after Ti6AI4V implantation in cancellous and cortical bone of healthy and ovariectomized animals to determine characterization of the bone-biomaterial interface in osteopenic bone. MATERIALS AND METHODS Nine ovariectomized and 9 sham-aged rats were used. Four months later, nails were implanted in the distal femurs, and the...
Dual-energy X-ray absorptiometry (DXA) measures areal bone mineral density (BMD) and is affected by bone size. Peripheral quantitative computed tomography (pQCT) measures volumetric density and should not be affected by bone size. We hypothesized that pQCT could be used to measure geometric parameters in the tibia and that bone size, not density, would correlate with weight and height in 3 and ...
The purpose of this study was to explore the relationship between bone mineral density and histopathological features of mandibular alveolar bone evaluated quantitatively by Hounsfield units [HU] and by histopathology in human subjects. Fifty-six mandibular molars were extracted in 50 patients. Computed tomography was obtained preoperatively, and a cortical bone biopsy was obtained on the extra...
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