Biomechanical analysis of the implants in highly absorbed maxillary sinus district

BACKGROUND: The finite element method has been widely used in orthopedic biomechanics analysis by evaluating Max von Mises stress and stress delivery and distribution. However, due to the complex biomechanics environment in the body and significant individual differences, it is difficult to obtain clinical methods based on specific cases. OBJECTIVE: To analyze the biomechanical distribution of implants in the maxillary sinus district. METHODS: An implant model, 5.5 mm×11.0 mm, located in the second molar of the maxillary was built using Simplant. The distribution of the stress of maxillary sinus district in the conditions of normal occlusion and crossbite under loading of 300 N at 0°, 30°, 45°, 60°, and 90°, respectively, was analyzed using Abaqus finite element software. RESULTS AND CONCLUSION: In crossbite condition, the concentration stress of von Mises was evenly distributed in the junction of the neck of dental implant and cortical bone; under the 300 N equivalent loading at 0°, 30°, 45°, 60°, and 90°, Max von Mises stress was 23.43, 52.97, 61.18, 66.15, and 70.53 MPa. In normal occlusion condition, the second stress concentration zone appeared in cortex in addition to the junction of the neck of dental implant and cortical bone, and Max von Mises stress was 30.91, 71.22, 71.62, 77.65, and 73.21 MPa under the 300N equivalent loading at 0°, 30°, 45°, 60° and 90°, about 50% higher compared with crossbite. Finite element analysis demonstrates that it is better to adopt crossbite in highly absorbed maxillary sinus district.