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Object To emphasize the necessity and significance of informed consent in the plastic surgery.Further investigating the ethical implication involved in informed consent principles.To standardize the medical treatment action according to the informed consent principles.Methods Through the literature search method,counseling for experts,sampling surveys and other approaches to elucidate the importancy of informed consent in plastic surgery,to survey and analyze the difficulties and ethical dilemma encountered in the process of standardization.Results Plastic surgeons firmly are aware of the principles of informed consent,as a routine preoperative procedure,however there are still some difficulties in practice.Conclusions To respect the patient's right to know,plastic surgery doctors should be standardized to perform the principle of informed consent; meanwhile hospital should develop a series of systems to regulate the principle of informed consent.

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Aiming at filling the vacancy in the study about mandibular movement, which mainly focuses on the field of biology at present, this study builds a mathematical model of 3-dimensional excursive movement of the mandible on Hanau articulator from the viewpoint of spatial mechanisms and analytical geometry. On the basis of the theory of spatial mechanisms, the freedom of motion of Hanau articulator is analyzed, and a hypothesis of constraints is presented, the objective of which is to restrict the mandibular movement. Based on the theory of analytical geometry, a series of mathematical expressions are derived to describe the 3-dimensional movement of the mandible mounted on the articulator. With the geometrical parameters of the articulator, these mathematical equations are solved by programming in Matlab 6.5 (a language for technical computing) and VC + +6.0. Therefore, the spatial path of the arbitrary point on the mandible can be precisely described when the upper body of Hanau articulator is guided along a specific direction. This study proves that the included angle between the plane of orientation and occlusal plane is positively related to the inclination of condylar guidance and incisal guidance, therefore, provides a theoretical foundation for Hanau's laws of articulation and the Hanau Quint. The future of dentistry is basically connected with the use of computer technology. This study will be useful for the further research of the dynamic occlusion to improve dental restorative procedures by realizing future replacement of the mechanical articulator with a virtual one.

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The purpose of this study is to solve the problems that lie in the current research on mandibular movement and dynamic occlusion of complete denture in the field of dental restoration. On the basis of the theory of spatial mechanisms, the displacement matrix of mandibular movement on Hanau articulator is established through the method of direction cosine matrix. By adopting techniques such as laser scanning, computer graphics, and computer database, a 3D digitized model of maxillary and mandibular body is reconstructed, and then a computerized simulation system of mandibular movement is developed. With the aid of this software, the geometrical locus of an arbitrary landmark on maxillary denture can be plotted, the visualization and diagnosis of mandibular movement can be easily realized and the information concerned with the positions and number of the occlusal contacts can be obtained. One edentulous case is taken as an example in this article. The results show this study provides a useful tool to deal with the functional aspects of occlusal morphology in a diagnostical and therapeutical sense.