Dimensions of Proximal Femur - An Anatomical Study

The morphometry of proximal femur is necessary in planning surgeries of hip joint and preparation of prosthesis for hip replacement. The aim of the study was to measure various morphometric parameters of femoral head and neck. The study consisted of sixty adult dry human femora of both sexes (thirty left sided and thirty right sided). Various dimensions of femoral head and neck were measured by slide caliper. Diameter of femoral head was estimated to be 39.28±3.87mm along cranio-caudal axis and 41.18±4.14mm along sagittal axis. Diameter of femoral neck was established as 29.03±3.8mm along cranio-caudal axis and 24.36±3.13mm along sagittal axis. Length of femoral neck was measured to be 50.57±6.77mm. The findings of the study will be useful in manufacturing prosthesis and implants for hip replacement as well as other surgeries involving proximal femur.

BIOCOMPATIBILITY AND REACTION OF DENTAL POLYMERS IN ORAL ENVIRONMENT

Dental polymers, commonly known as “Dental Resins” were first used in dentistry in 1839, and since then they have emerged as a favorable candidate for restorative dentistry and cosmetic and functional purposes. Many prosthesis and implants made from polymers have been in use for the last three decades and there is a continuous search for more biocompatible and stronger polymer prosthetic materials. Typical applications of polymers in dentistry are impression materials, relining materials, temporary crown materials, denture base materials, obturation materials (endodontic treatment), and filling materials (composite, cements, adhesives). The dental polymers that are to be used in the oral cavity should be harmless to all oral tissues – gingiva, mucosa, pulp, and bone. Furthermore, it should contain no toxic, leachable, or diffusible substance that can be absorbed into the circulatory system, causing systemic toxic responses, including teratogenic or carcinogenic effects. The materials should also be free of agents that could elicit sensitization or an allergic response in a sensitized patient. Rarely, unintended side effects of dental polymers may occur as a result of toxic, irritative, or allergic reactions. The most widely used polymer in prosthodontics is polymethyl-methacrylate resin (PMMA), which is used for fabrication of various dental prostheses and denture liners, temporary crowns and orthodontic appliances. The aim of the current paper is to provide an overview of the current literature on toxicology of dental polymers and to give implications for possible improvements concerning their biocompatibility.

Biomaterial Models Adjustment and Comparison for Ultra-High Molecular Weight Polyethylene in Finite Element Models

GUR1050 is a medical grade variety of ultra-high molecular weight polyethylene (UHMWPE) intended for use on total joint prosthesis and implants. Probes of this material were characterized on a compression test following ASTM norms and lineaments. Available data from these mechanical tests is fitted on multiple material models. Achieved results on numerical solutions of finite element modeling (FEM) of the tests are discussed, looking for the best one available in order to simulate with accuracy GUR1050 behavior, with specific interest on the load curve results, showing the pertinence of using certain models on different conditions. It was found that the use of a bilinear isotropic hardening model assures the best fit for GUR1050 behavior in uniaxial compression under a constant strain rate.

Major advances in ophthalmology: emergence of bio-additive manufacturing

Important efforts to discover new ways to combat illnesses are being carried outworldwide. In this sense, bio-additive manufacturing is an innovative technology that willrevolutionize the health industry, as it provides the possibility to develop three-dimensional biodevices, such as body tissues and even organs. This research explores the most novel inventionsof bio-additive manufacturing in ophthalmology. The main aim is to support the decisionmaking of the research community and the organizations involved in this industry. The majoradvances, organizations, research focuses and main countries involved in the ophthalmologyfield were identified. To accomplish this, a scientometric patent analysis was carried out usingadvanced data mining software and consultations with experts. Insights show a global researchtrend toward the development of lenses, followed by prosthesis and implants. Bio-additivemanufacturing is now in a nascent S-curve phase; however, important advances are beingcarried out.