چكيده به لاتين
Purpose: The main purpose of this research is to improve the geometrical design of implant
fixtures with finite element methods, in a way that reduces the maximum micromotion in the bone implant or BIC. The secondary goal of this research is to involve the Von-mises stress and use it for a more complete comparison of the stability structure in dental implants. Materials and
methods: A 36-mm-long area of the mandibular bone was cut from the mandibular premolar of a
41-year-old man, which was extracted by CBCT images and imported and processed in 3D in
Mimics and 3-Matic software. In the next step, with the help of 7 geometry parameters, including
length (L), diameter (D), pitch (P), length of the conical area (L2), the smallest diameter of the
implant (D2), thread depth (W) and thread angle (Beta) and using A 16-step test was designed by
Taguchi method, and then these models were designed and assembled in Solidworks software. In the implantation stage, all models were implanted with the same conditions and D2 bone quality, and the volume of the implant was reduced from the bone in the Solidworks software. As a result, planting models were entered into Abaqus software. BIC area was considered as a friction type with a friction coefficient of 0.3. Our simulation is of static type with a force of 200N and a loading angle of 30 degrees for stress and micromotion analysis. Results: The results were checked in two ways. The first condition was the condition where micromotion is the only considered factor, and the second condition was the condition where the maximum stress and micromotion in the implant and bone had its lowest value. In both modes, 0.9 for pitch value has the best performance and three parameters L2, D2, Beta had similar trends. Length is the most effective parameter in the investigation of micromotion, which decreases with increasing length. In the diameter parameter, opposite to the length, the opposite relationship has been seen, and in the thread depth parameter, 0.45 creates the least micro-motion. In second condition for length parameter, a similar trend is observed up to 12 mm. For the depth of the thread, unlike the previous case, the depth of 0.35 is replaced. Conclusion: According to the findings of the research, the most suitable implant to provide better Stress and micromotion in the BIC area is an implant with a length of 12 mm, diameter of 5 mm, thread pitch of 0.9 mm, depth of 0.35 mm, angle of 60 degrees, length of the conical area (L2) is 0.6 and the smallest diameter is (D2) 0.8. The proposed implant creates a micro-motion of 25 micrometers and 170 MPa stress in the implant by predicting the Taguchi method.
