| For the edentulous patient, complete denture would be a long-term restoration, it can be used even all one's life. If the complete denture fit for the edentulous patient, the stress distribution under occlusal force on the supporting tissue is balanced, it may lower the speed of the bone resorption. On the other hand, if the stress's direction and distribution of complete denture under occlusion force are imbalance. it may cause the alveolar bone resorb quickly. Artificial teeth are important to the complete denture, and they are the most important factor we argued. We have different point of view about choocing the complete denture with different cusp inclination. There have been more than one hundred designs about the artificial teeth, but which one is beneficial for the stabilization of the complete denture; it can improve the mastication efficiency and be good to the supporting tissue? We have not a consistent idea about it.The resorption of residual ridge is the main change after the teeth get off from the alveolar bone. The bone resorption have relation to not only the health of the patient and the metabolism of bone, but also have relation to the effect of the restoration .It is chronically,gradually ,unreversible for the the resorption of residual ridge. The residual ridge resorption has direct relation with the stress, the rebuilding of bone is the bone of the body has metabolism all life, the bone's structure may be get stronger or weaker. The bone's rebuild defering to Wolff's law: The mechanical strength of bone is decided by the bone's structure. The stress is very important for bone to keep or change it's structure. If the intensity of stress inner the physiology limit, the stimulate will get the bone stronger, If the intensity of stress is higher or lower the physiology limit, it will weaken the bone .This study based on the biomechanical considerations. We used Solidworks 2001 computer-acided design system to establish four kinds of models with different resorption degrees(by Kent's) ,â… degree of the alveolar bone from it's top to it's bottom is 30mm; â…¡ degree of the alveolar bone from it's top to it's bottom is 27mm; â…¢ degree of the alveolar bone from it's top to it's bottom is 24mm; â…£ degree of the alveolar bone from it's top to it's bottom is 21mm. then we build complete denture with cusp inclination. In this way we built 24 models, we use the method of three-dimentional finite element analysis to investigate the influence of the strees's distribution under the complete denture with cusp inclination, so that we can find out which kind of denture is beneficial for the residual ridge with different degree of resorption .Experimental results demostrate that: The side-stress which is on the alveolar bone under the complete denture with same cusp inclination is increased with the aggravation of residual ridge resorption, it is harm for the alveolar bone; If the alveolar bone is in the same condition, when the cusp inclination increased, the factors of unsteadiness will increase. The complete denture with cusp inclination of 0 degree fit for the patient whose alveolar bone's resorption is â…¢ degree ; the complete denture with cusp inclination of 33 degree fit for the patient whose alveolar bone's resorption is â… degree . the tress under the complete denture with cusp inclination of 20 degree is between that of 0 degree and 33 degree, the complete denture with cusp inclination of 20 degree fit for the patient whose alveolar bone's resorption isâ… or â…¡ degree. For the complete denture, the cusp inclination of artificial teeth is a important factor, it will do much influence to the stress distribution of supporting tissue. But we should have good cognizance about that the cusp inclination of artificial teeth is only a factor to influence the stabilization of the complete denture and the health of the alveolar bone. The study is investigating the cusp inclination of artificial teeth to find out which is beneficial for the health of the...
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