Abstract
In implant treatment, GBR (guided bone regeneration) is frequently used in cases of severe alveolar bone resorption. However, there are few reports about bone quality at the GBR site replaced with bone. In the present study, inhomogeneous clinical mandibular posterior teeth defective models were created based on CT values. Bone quality at the GBR site was changed from D1 to D4 in the Misch's bone quality classification, and the diameter of the fixture to be placed was also changed. Finite element analysis was performed to examine the mechanical effect of bone quality at the GBR site on the peri-implant bones.
Results, discussion and conclusion: The harder the bone quality at the GBR site, the lower the maximum Mises stress was. Particularly, for bone quality greater than D2, a constant trend was observed regardless of the diameter of the fixture. Also, the thicker the fixture to be placed, the lower the maximum Mises stress was. Particularly, when the diameter of the fixture was thicker than a certain level, the maximum Mises stress showed a constant trend regardless of the bone quality at the GBR site. For bone quality D1 and D2, the position of the generated maximum Mises stress was located at the peri-implant superficial alveolar bone; for bone quality D3 and D4, the position moved to near the boundary region between the GBR site and the original mandibular bone. It is not that the harder the bone quality at the BGR site, the better. Rather, it is suggested that the harmony with the original mandibular bone is important.
