ABSTRACT
Advance medical directive has been implemented in many countries and regions, has also been widely concerned by medical and ethical circles in China, and has gradually entered the public consciousness. The phenomenon of loneliness, disability and dementia of the elderly is gradually increasing, which reflects the importance of advance medical directive in this large group. Therefore, this paper focused on the main body of medical decision-making patients, patients’ families and medical staff to describe the development status of medical decision-making in China, and analyze the reasons for obstacles in the promotion of advance medical directive in China from cultural, social and economic factors. By comparing the system, culture and medical insurance payment methods of the advance medical directive system in China and western countries, this paper explored the feasibility of constructing this system in China, and put forward that the construction of the advance medical directive system in China should be prepared in the cultural, economic and other aspects, so as to better improve the life quality of the elderly at the end of life in the future, and also provide some useful reference for its promotion in China’s medical practice.
ABSTRACT
Through the analysis on principles of dental panoramic radiography, we analyzed the influence factors of the dental arch, and provided the main principles for optimizing design to improve the image quality. Through the analysis on the human dental arch’s form, we optimized the radiographic procedure. Many factors affect the quality panoramic image, but the focal trough’s design is one of the most important factors, especially for canine regions. Optimizing design of focal trough can lessen degrees of horizontal and vertical magnification, also can reduce geometric distortion and overlapped images of teeth.