The 3D Finite Element Analysis Of The Stress Distributions In Bilateral Distal-extension Edentulous Dentition With Extra-coronal Attachment

The distal-extension edentulous dentition, especially used to repaire more than one back-tooth, has long been a difficulty in the field of stomatological repairing. As the removable partial denture with the precision attachment has the advantages of having great retention, high stabilities and better looking with little foreign effects, it is a comparatively ideal. In the course of treating, the choice of the abutment has great influence on the therapeutic effect of repairing method. These are still disputable on the choice and number of abutments and the bottom line of the periodontal absorbability. Pursuing the way of using more abutments blindly, more tooth tissue must be abraded away, which may cause gum imitations to the living marrow tooth and also increases expense. So, explore the best therapeutic method has guiding significance onto the clinical practice. After the repairing of precision attachment, studies on the pressures and its distribution on the abutments and periodontal tissues could reveal the state of repairing. Also, the pressures and its distribution on the abutments and periodontal tissues have great significance on the sound choice of abutments.A 3D finite element model of bilateral distal-extension edentulous dentition, which includes mandible, incisors, canines, premolars is set up in this thesis. Based on this, a 3D finite element model on the periodontal tissues' intactness and absorbability of different numbers of abutments is also set up. Then, presuming that the denture and edentulous alveolar bone are in contact, using the software ANSYS, analyses on those models are done. To be detailed, there are three chapters: 1. What influences the precision attachment repairing has on abutment and periodontal tissues...