This paper demonstrates the successful application of a novel approach to the computer aided design (CAD) of removable partial denture (RPD) framework. Firstly, we get the data of the partially edentulous cast, a mandibular Kennedy Class II, through a 3D-optical grating measuring system after corresponding pretreatment. Then, the reverse engineering software and 3D CAD software was used to design basis, big conjunction, clasp, small conjunction of the RPD framework. Finally 3D surface model of the RPD framework was created in preparation for direct manufacture using rapid prototyping (RP) methods and foundry. The result indicated that the RPD framework was fabricated successfully and the resulting frameworks provided a satisfactory fit.
Computer-Aided Design ; Dental Alloys ; Dental Casting Technique ; Dental Prosthesis Design ; methods ; Denture Design ; methods ; Denture, Partial, Removable ; Humans

Objective To propose the confirmatory method for water-a factor related to disease nature. Methods Based on a symptom-pathogenesis database of Chinese medicine,the clinical characteristics of some symptoms that their pathogenesis can and only can be directly explained by water were screened. Results Water maybe excessive and dilute pathological products existing in skin, pleural cavity and abdominal cavity or exhausted from urinary passage and anus because of metabolic disorders. It is related to the decrease of assimilation or re-assimilation of humor. Water, as a factor related to disease nature, has some specific symptoms as (skin) dropsy sunken when pressed, (pleural cavity, abdominal cavity and etc.) hydrops, clear abundant (urine) and watery (stool). Conclusion The evidences for conforming pattern factors are the clinical characteristics of specific symptoms, and pathogenesis explanation is the basis that can establish the close relationship between a pattern factor and clinical characteristics of symptoms. The disease nature can be directly diagnosed as water when any one of above clinical characteristics of specific symptom appears. Water is a pattern factor.