Purpose: The purpose of this study was to analyze stress distribution patterns in implant restorations created in different length and diameter made of titanium and zirconia by using three dimensional finite element analysis (FEM) with straight and 15˚ angled abutment. Materials and Methods: For titanium models; Ti-6Al-4V for implant fixture, connection element and abutments (straight and 15˚ angled abutment), yttrium tetragonal zirconium polycrystal (Y-TZP) for zirconium framework, Felds phatic porcelain for superstructure material and for zirconia models; Y-TZP for implant fixture, connection element, abutments (straight and 15˚ angled abutment) and zirconium framework, Felds phatic porcelain for superstructure material were used. The implants and their superstructures were modeled using CAD software Creo Elements-Pro5.0 and the mandibula was modeled using MIMICS 13.1 software. Optimum finite element modelled was obtained nium implants with maximum stress for implants of the same length but different diameters, same diameters with different lengths and straight and 15˚ angled abutment showed nearly similar variances. Conclusion: With in the limitations of this study, increasing implant diameter is better than decreasing implant diameter both for titanium and zirconium models but raising implant length is worse than decreasing implant length with applied masticatory forces.
This paper is mainly focused on the wetting state of liquid droplets on Ni-Ti and Ti-6Al-4V hierarchical structured hydrophobic surfaces in micro/nanoscale. Electroless Ni-B deposition as a surface coating treatment has recently drawn considerable attention of researchers owing to remarkable advantages when compared with other techniques such as low price, conformal ability to coat substrates, good bath stability and relatively easier plating process control. The Ni-Ti and Ti-6Al-4V substrates were plated by electroless Ni-B plating process. The coated films were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), hardness testing and static contact angle measurement. Results obtained from the analyses show that electroless Ni-B deposition may improve the hardness and wettability of the Ni-Ti and Ti-6Al-4V alloy surfaces.
Knee meniscuses are fibrous cartilages that are present to disperse friction in the knee joint between the tibia and femur bones. They work to disperse body weight and reduce friction while moving. Because the condyles of the femur and the tibia converge at one point (which changes as they bend and stretch), the meniscus expand the weight of the body. It is important to describe the mechanical behavior of the meniscus because of its significant role in bearing the load on the knee joint. Research shows Compressive stresses on the menisci have been shown to be a major factor in destructive joint injuries, including osteoarthritis. Anterior cruciate ligament tearcan also have a profound effect on the meniscus. Clinically, meniscus injury is common in patients with a tear cruciate ligament. The main purpose of this study is to determine the stress distribution diagram of internal and external menisci and to evaluate the comparison of healthy meniscus stress and meniscus tearwith the stability of the cruciate ligament and the instability of this ligament. The bone structure of a healthy joint was designed and analyzed in ANSYS program package, and the forces applied to the meniscus under the presence or absence of ACL ligament were evaluated. The results of biomechanical studies showed that tearof the meniscus and the anterior cruciate ligament play an important role in the stability of the meniscus. With the tearof the meniscus and ligament diagram, the distribution of stress and the amount of stress in the meniscus increases, which can be obtained by the interdependence of the meniscus and the surrounding ligaments for normal joint function.
The cornea is a transparent and curved tissue located at the front of the eye, specialized to focus light and protect the eye from external factors. The importance of the cornea in the structure of the eye and visual system is often overlooked because of its transparent nature. The cornea lacks the complex neurobiological structure of the retina and the dynamic nature of the lens, but despite this, it is unable to function properly without transparency in this organ of the eye. The complexity of the structure and function of the cornea, which makes it transparent, is a surprise that led us to examine one of the most important components of the visual system. The cornea is a vascular-free connective tissue that serves as the first barrier to the spread of infection to It acts inside the eyeball as well as the building block of the eye wall. Corneal transparency is due to several factors, including the structural anatomy and physiology of its cellular components. Keratoconus is an eye condition in which the cornea deforms and protrudes forward in a cone shape. This change that occurs in the cornea causes the incoming light to be unable to focus in the visual field. The result is blurred and distorted vision. There are also studies showing that eye rubbing can be effective in the onset and progression of the disease. In this study, wear from eye rubbing in kerataconus disease was analyzed by means of finite elements. Deformation and stress analysis in the cornea were investigated. FEM can help to predict biomechanichal behavior of corna after kerataconus dises. Due to the rubbing effect at the contact point, contact pressure, vonmises stress and wear reach their maximum value.
In this study, the fatigue analysis of the vehicle brake disc was simulated using the finite element program, and life calculations were made in accordance with the analysis. The main purpose is to simulate experimental tests, which take a long time to result, in the computer environment and to obtain results in a short time and at a very low cost. With the help of the ANSYS computer program, which operates with the finite element logic, the disk brake system was created in three dimensions, and the boundary conditions closest to reality were determined and analyzed using the finite element method. In the disc brake system selected, the data obtained by conducting stress, fatigue life, and safety coefficient analyses in line with the forces formed on the wheel and the vehicle during braking were examined. According to the analysis results, our brake disc is in different life ranges in accordance with the material used and the load applied, and when the force is increased, the life decreases and vice versa.
Intervertebral discs act as a shock absorber to counteract the blows to the spine. These elements have the ability to deform when applied pressure, thus reducing the intensity of impacts. The main shape of discs is spherical when not under pressure; but when they are placed between the vertebrae, they expand under the pressure. One of the important functions of intervertebral discs is to facilitate movements in the spine In order to study biological mechanics as one of the engineering infrastructures, in this paper, the combined modeling of finite element intervertebral discs as a saturated porous soft tissue is discussed. First, according to the continuum mechanics, the mathematical model is extracted and then the finite element model is prepared by ANSYS program package. Based on the different loads according to the available medical information, the biomechanical behavior of the disk was investigated. This model can be used to investigate the behavior of intervertebral discs in patients before or after surgery. In this paper, in addition to the mathematical model, the mechanical behavior of the disk and the stress distribution under different loads were investigated.
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