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As a general rule, the purpose of treatment planning should be minimization and evenly distribution of mechanical stress in the adjacent implant and bone system. Various experimental studies have examined the distribution of stress in the implant supporting bones, thus avoiding the dangers involved. But there is still controversy about biomechanical effects and stress distribution in different attachment designs. The purpose of this study was to compare the distribution of stress around the implant with three different attachments in overdenture based on four maxillary implants using fi nite element analysis method (FEA). In this experimental study, using the FEA method, a 3D model of maxilla, implant, attachment components and overdenture was fi rst prepared and then, using the ANSYS fi nite element software, the components of the model were superimposed on each other so that it can act as a component integrated with different materials. Implants are located in the anterior and posterior parts of the maxilla, with two implants placed in the two sides of the canine, one in the left central position and the other in the right second premolar. These implants were attached to the overdenture using three bar-clip, ball, and locator attachment designs. The 100N force used in this study and imposed vertically to the tooth 6 unilaterally and bilaterally and the stress level was investigated in each design. Among the three different designs examined, the highest stress was observed in the vertical force (22.87 MPa) imposed on the implant in the right second premolar on the right overdenture supported by the locator implant. In the second place, the highest stress was observed on the Ball-retained overdenture in the right side force, imposed on the implant in the right second premolar corresponding to 12.88 MPa. The least stress among these three designs was observed in the bar-clip-retained overdenture design, the maximum stress on which is in the vertical force imposed on the right side to the right second premolar implant at the size of 7.486MPa. Bar-clip-retained overdenture with the lowest stress caused by the 100 N force is the most appropriate design in the present study.

bioscience biotechnology research communications

Comparison of stress distribution around implants with three different attachments in overdenture supported by four maxillary implants using fi nite element analysis method