| Deletion of the free end is common in clinic, and it is the focal point and hard point. It may be restored by removable partial denture. A pair of qualified removable partial denture must be comfort, can recover the facial beautiful outlook and vocalization, and obtain the satisfactory mastication function.The removable partial denture must be supported by the surplus base teeth and alveolar ridge mucous membrane, because the distal locus lack the nature teeth and shoulder the big partial of mastication pressure.However, the surplus base teeth and alveolar ridge mucous membrane are different,the base teeth provide the relative resistant support; the alveolar ridge mucous membrane posses the fairly big alienability; when they suffer the power in oral cavity functional status. Their movement are different. The denture will happen the conbolution and the sink, and they will yield the torsion. Because the alveolar ridge mucous membrane support unequal power, it will cause the basis teeth loose and the alveolar ridge absorption, and the two accelerate each other to yield the vicious cycle, and they will cause the basis teeth loose and shedding. The removable partial denture is a excellent cure method with price cheap, the style active and removable, and it serve for the lose teeth patient with any age. The removable partial denture can recover the facial beautiful outlook and vocalization, obtain the satisfactory mastication function, and preserve the lose teeth and periodontal tissues. However the removable partial denture suffer the power in oral cavity functional status, Their movement are different. The denture will happen the buckling and the sink, and they will yield the torsion. In the clinic the distal basis teeth trauma and the alveolar ridge mucous membrane tenderness is common. So The question that the denture is comfort and stable,and the profitable the soft and hard tissue's health , is the important topic in the prosthodontic field.The pain phenomenon is common in the period of the denture initial ware and usage, they effect the use of the denture. For decreasing the pain phenomena, every link must science and accurate in the period of the denture restore.The removable partial denture of the free and design posses the high science. We must think about the jaw force and the bear ability of the oral cavity tissue when the denture exercise the function.The jaw force should distribution well-distributed on the soft and hard tissue, the basis teeth will avoid the mis-storsion. The excellent retention of the denture is the necessary condition to avoid the pain.To investigate the characteristic and reason of the pain locus when the denture exercise the function, and avoid the production the pain phenomena after the removable partial denture is used. In our clinical retrospective study, we collect 82 cases that are restored by the removable partial denture of the free end. 40 patients' old denture can't use again. 42 patients is preliminary diagnosis. By the routine examination and treatment, to aim directly at the oral cavity status and the condition of the dentition defect. We design and fabricate the removable partial denture of the 82 cases, then try-in. We statistics the locus characteristic of the pain,and analysis the reason. By adjust and milling , amortization and so on, they make the denture comfort and exercise the normal function.In 40 cases that the denture can't continue to use because of the ache, The curvature removable partial denture occupy to 90%. Because of the retention stabilizing. The patients with the ache occupy to 67.5 %. Because of the basis teeth mobility, the patients with the ache occupy to 22.5 %. The new removable partial of denture 82 cases is tried on, 74 cases patients present on the different locus and degree ache in the period of the try-in. The ache patients in the vestibular groove of the margin of the denture's base occupy to 38.2%. The ache patients in the alveolar ridge crest when they bite occupy to 25.8%.
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