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Stress distributions created by short and regular implants placed in the anterior maxilla at different angles, part 1: a finite element analysis
Purpose: The purpose of this study was to examine and compare the peak von Mises stress distributions in the crown, implant and abutment by using finite element analysis (FEA). Besides, a comparison of the implant-abutment connection types in the short implant with the FEA method was established. Material and Methods: A short implant (4×5 mm) with taper-lock connection and a regular implant (4×9 mm) with screw connection was used in maxillary central incisor tooth area. Three different titanium abutments with 0°, 15° and 25° angles were used for abutments. In addition, in order to determine whether the stress change in short implants is due to the length or the implant-abutment connection, a screw was designed for short implant and it was also evaluated in same three angle. A total of three groups and nine models were generated. 114.6 N load was applied to the cingulum area of the crown at an angle of 135 ° to the long axis of the crowns. A torque load of 25 Ncm was applied to the regular implant screw. The same torque load was applied to the short implant screw to compare the implant-abutment connection. Von Mises stress distributions of implants, abutments and crowns was evaluated bu using FEA. Results: Increased angle in implants increased von Mises stress values of implant, abutment and crown. Screw connection was found higher at all angles in short implants. Close values were found at different angles in taper-lock short implant crowns. Conclusion: The length and the angle in the bone of implant with the type of implant-abutment connection results in the accumulated stress values.