ABSTRACT
Objective: To estimate resistance ability of improved anchor screw. Methods: The experiment consisted of two sections: tensile test and finite element analysis (FEA). In the first part, the traditional anchor screw and the improved anchor screw were implanted into the condylar cortical bone, respectively, tensile force was tested by tension machine. In the second part, the three-dimensional finite element model of mandibular condyle was established after the improved anchor screw was implanted, and the FEA was performed by the force applied from three different directions. Results: The FEA results revealed the minimum force of the traditional and improved anchor screws were 48.2 N and 200.0 N, respectively. The tensile strengths of the traditional and improved anchor screws with a 3-0 suture were significantly different (P=0.033). The difference between the traditional anchor screw (3-0 suture) and the improved anchor screw (2-0 suture) were significantly different (P=0.000). Conclusion: Compared with traditional screw, improved anchor screw has better resistance ability, especially combined with 2-0 suture.