چكيده به لاتين
Purpose: The main purpose of this study is to improve the geometric design for dental implants using finite element methods. Employing this method will reduce the maximum stress on the jawbone. We should mention that this study's secondary goal is to investigate the better design for different alloys by implementing them into the model. Materials and Methods: Due to the design of the implant with a conical shape at the bone level designed by Straumann® company and made of Roxolid with the following specification (Length 12 mm - diameter 4.1 mm - thread pitch 0.8 mm), by changing its design parameters in SolidWorks software like length (10-14) mm, diameter (4.8) mm and, thread pitch (0.7 - 0.9) mm, deformation of the thread shape into a square and also by changing the constituents of the implant fixture, (Roxolid, Titanium alloy Combination with Aluminum and Vanadium, Tantalum Alloys and, Polieteretercetona). Simulated in the mandibular molar area with bone quality D3, under two static forces which will apply vertically (200 Newton) and angular (100 Newton with 45-degree angle) and A tightening process for a torque of 32 N∙cm was loaded. Von Mises stress analysis was performed using Abaqus software, and ten different types of models were obtained. Results: By increasing the length, diameter, deformation of the implant thread and decreasing the implant step, the maximum Von Mises stress decreases in the Cortical and Spongy bones around the implant. Also, implant fixtures made of Roxolid have an improved Von Mises stress distribution in the bone around the implant. Conclusion: According to the findings of the study, the proper state of the implant to better distribute Von Mises stress in the bones around the implant was a Roxolid implant and a dimensional parameter with a length of 12 mm, a diameter of 4.8 mm, a thread pitch of 0.7 mm and The shape of the thread is square.
