Aim: To evaluate the effect of the implant's thread cross sectional design on the micromotion of the implants in different bone qualities.
Materials and methods: In this finite element analysis study, four implant models exhibiting four different thread designs were created using Solidworks software. Each model was assembled in four different bone quality models resulting in 16 groups. Each group was examined for micromotion under 100N force using ANSYS software.
Results: D1 bone showed the lowest micromotion while D4 bone showed the highest, regardless the thread design. In D1 and D2 bone, v-shaped thread showed the lowest micromotion, which was lower than the square thread and the buttress was lower than the reverse buttress. While in D3 and D4 bone, the lowest micromotion was observed with the square thread, which was lower than the v-shaped and the reverse buttress thread was lower than the buttress thread.
Conclusion: Micromotion decreases as the bone quality increases irrelevant of the implant thread design. In D1 and D2 bone, the best thread to be used is the v-shaped thread, while in D3 and D4 bone, the best is the square shaped thread.