Finite Element Analysis Of Compare Stress Distribution Of Maxillary Central Incisor After Dental Implant Prosthesis With Abutements In Different Ways

Objective: Pro/E software was used to establish three- dimensional solid models including the dental implant,the upper structure,the maxillary bone and abutements with different positions,materials,angles and then analyze the stress distribution in ANSYS.As a reference of the late prosthodontics.Methods: Using the high precision scanner to get the accurate shape of the model including the dental implant and the upper structure as stl. format. Pro/E software was used to establish three- dimensional solid models including the dental implant,the upper structure and the maxillary bone,and then mesh, set the material parameters, set the contact between the adjacent interface, and analyze the stress distribution in ANSYS with 200 N vertical and oblique static load.Then draw diagrams. To investigate the effect of different abutements for the prosthodontics.Results: 1. Using the high precision scanner to get the accurate shape of the model and keep the wholeness sample.The model has high geometric similarity and the similarity mechanics,and it can relex the problem of this experiment. 2. The equivalent stress distribution nephogram display that the maximal equivalent(von-Mises) stresses were located in the screws when normal occlusion and cutting for cutting bite.3. The simulation showed that The stress value of von Mises of the components with the oblique force were significantly greater than that with vertical force. 4. The stress in the cortical bone is significantly greater than that in the cancellous bone.The stress in the cortical bone mainly concentrates on the implant neck. 5. when using zirconia ceramic abutement the distribution of stress in bone tissue and the peak stress and not much changes. 6.The stress peak locates in the screw when normal occlusion and cutting for cutting bite with Titanium abutements,but in the abutement with ceramic abutements. 7.Stress peak almost increase when the abutement in tongue juga position. 8.Sterss peak in the the cortical bone and the implant with angled abutements is greater,and in the abutement is lower. 9.Combined crowns restoration can reduce the stress of the assembly when using angled abutements. Conclusions: 1. Using the high precision scanner and Proe Wildfire5.0 to get the accurate shape of the model. 2. Damage risk of crown when deepoverbite is greater than that when normal occlusion. 3. There is a great relationship between the absorption around the alveolar and the stress concentration in the cortical bone. 4. Try to reduce the lateral force to reduce the probability of the fracture about the porcelain crown and the loosening of the abutment screw and the implant. 5. The screw has the greater risk of loosening and fracture after the prosthodontics with titanium abutements. The abutement has the greater risk of loosening and fracture after the prosthodontics with zirconia abutements. 6. Try to set the abutement stations in the crown axis position that can reduce the stress of each structure 7. The burden of bone and implant is bigger when using angled abutements. 8. In order to reduce the stress of the assembly with angled abutements,we may consider choosing the method of combined crowns.