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Summary: COVID-19 is a pandemic that has forced many states to declare restrictive measures in order to prevent its wider spread. These measures are necessary to protect the health of adults, children, and people with disabilities.Long quarantine periods could cause an increase in anxiety crises, fear of contagion, and post-traumatic stress disorder (frustration, boredom, isolation, fear, insomnia, and difficulty concentrating).Post-traumatic stress disorder (PTSD) is a condition that can develop in subjects who have witnessed a traumatic, catastrophic, or violent event, or who have become aware of a traumatic experience that happened to a loved one.In fact, from current cases, it emerges that the prevalence of PTSD varies from 1% to 9% in the general population and can reach 50%-60% in subgroups of subjects exposed to traumas considered particularly serious. PTSD develops as a consequence of one or more physical or psychological traumatic events, such as exposure to natural disasters such as earthquakes, fires, floods, hurricanes, tsunamis; wars, torture, death threats; road accidents, robbery, air accidents; diseases with unfavorable prognoses; complicated or traumatic mourning; physical and sexual abuse and abuse during childhood; or victimization and discrimination based on gender, sexual orientation, or gender identity. It can also develop following changes in lifestyle habits caused by the COVID-19 epidemic.Thank you for reading the manuscripts in this Special Issue, "The Impact of the COVID-19 Emergency on the Quality of Life of the General Population".

Summary: This book aims to summarize the latest achievements in the development and manufacturing of modern biomaterials used in modern medicine and dentistry, for example, in cases where, as a result of a traffic or sports accident, aging, resection of organs after oncological surgery, or dangerous inflammation, there is a need to replace lost organs, tissues, and parts of the human body. The essence of biomedical materials is their constant contact with living tissues, organisms, or microorganisms and, therefore, they should meet numerous requirements from various fields, including medicine, biology, chemistry, tissue engineering, and materials science. For this reason, biomaterials must be compatible with the organism, and biocompatibility issues must be addressed before using the product in a clinical setting. The production and synthesis of biomaterials require the use of various technologies and methods to obtain the appropriate material, which is then processed using advanced material processing technologies. Often, however, it is necessary to directly manufacture a specific product with individualized geometric features and properties tailored to the requirements of a particular patient. In such cases, additive manufacturing methods are increasingly used. In this sense, it can be considered that the Biomaterials 4.0 stage has been reached, and detailed information is included in the individual chapters of this book on the achievements in the development and manufacturing of modern biomaterials used in modern regenerative medicine, regenerative dentistry, and tissue engineering.