The application of the infinite element method to endodontic endosseous implant stress analysis

To study the precise stress distribution of the apical foramen area of endodontic endosseous implant, and improve the prosthetics of endodontic endosseous implant. After analysis of the two-dimensional endodontic endosseous implants model with finite element method, left, right areas beside the apical foramen were selected as infinite domains to calculate. D-N iterative method was used to connect the finite and infinite domains. Under 45° axial right oblique loading, the center of the tooth rotational movement descended downward to the implant outside the apical foramen of root. The stress concentration occurred in both infinite domains of the apical foramen. The infinite domain at the right side was tension stress concentration, but the other side was compression stress concentration. Two stress concentration points were just at the central points, which were intersections between implant and dentin. In the implant and dentin section, the stress reduced in all directions from these two stress concentration points, but in the ligament, the results were contrary. The movement of the rotational center of restoration is helpful to the tooth stabilization and carrying capacity after restoration. In the implant area, the diameter of implant at the apical foramen of root shall not be reduced to protect root in clinical work; It is very important to preserve the tissue of ligament for endodontic endosseous implants.