This study surveys the influences of travel speed, voltage, and intensity on characteristics low-carbon steel samples generated by Wire Arc Additive Manufacturing (WAAM) technique. The results indicated that WAAM have isotropy grain shape, with size number values varying from about 8 to 12. Interestingly, sample achieves better mechanical properties a higher ultimate tensile strength (UTS) valu...

BACKGROUND A number of studies have reported complication after reduction of nasal bone fractures. Among complicated cases, some showed improvement in shape of the nose with passage of time. Therefore, we examined these changes using computed tomography (CT) images taken over intervals. METHODS CT scans of 50 patients with new nasal bone fractures were reviewed, and the images were compared a...

This study aims to investigate the causes of catheter fracture and handling measures for implantable vascular access devices to prevent catheter fracture. We retrospectively examined 3088 adult patients with catheter fracture/disruption caused by totally implantable vascular access devices (TIVDs). In the 3088 cases, implantation was via the internal jugular vein in 2909 cases and the subclavia...

BACKGROUND The anatomic shape of maxillary premolars show a tendency towards separation of their cusps during mastication after endodontic treatment. Preservation of the marginal ridge of endodontically treated and restored premolars can act as a strengthening factor and improve the fracture resistance. OBJECTIVES To evaluate the effect of varying thickness of marginal ridge on the fracture r...

The preferred method of assessing the risk of an osteoporosis related fracture is currently a measure of bone mineral density (BMD) by dual energy X-ray absorptiometry (DXA). However, other factors contribute to the overall risk of fracture, including anatomical geometry and the spatial distribution of bone. Finite element analysis can be performed in both two and three dimensions, and predicts...

Background & Aims: Osteosarcoma is one of the most prevalent malignant bone tumors . This study is designed to assess the prognostic effect of pathologic fracture and treatment options on survival of patients with osteosarcoma. Materials & Methods: In this study, prognosis of 106 patients with limb osteosarcoma, which were treated at three  hospitals in Tehran from April to August 2012 ...

Heterogeneous materials with randomly distributed pores are ubiquitous, such as sintered silver nanoparticles, concrete materials, 3D printed polymers, and natural bones. Recent experimental investigations have revealed that porosity also pore-related geometries (size, number, shape, distribution alignment) significant impacts on the mechanical behavior of random porous materials. However, exis...

Background: The fracture of the mandible is the second most common facial bone injury.  When this injury occurs, it could be serious with complications that may even result in death. Objective: To evaluate the current trends in mandibular fracture (MF) in southern Iran. Methods: In a cross-sectional study, several parameters including age, sex, cause of fracture, anatomical site of fracture, pr...

Computed tomography (CT)-based finite element (FE) models may improve the current osteoporosis diagnostics and prediction of fracture risk by providing an estimate for femoral strength. However, the need for a CT scan, as opposed to the conventional use of dual-energy X-ray absorptiometry (DXA) for osteoporosis diagnostics, is considered a major obstacle. The 3D shape and bone mineral density (...