IADR Abstract Archives
Finite Element Analysis of Two Reduced-Diameter Zirconia Dental Implants
Objectives: To investigate the biomechanical behavior of two one-piece reduced-diameter zirconia dental implant systems using finite element method and provide information for design optimization of ceramic dental implants.
Methods: Two commercially available reduced-diameter one-piece zirconia implants, Straumann PURE Ceramic (SP, Ø=3.3mm) and Z-Systems Z5m (ZZ, Ø=3.6mm) were scanned using a micro-CT scanner (Skyscan1172, Microphotonics). Matching crowns for a mandibular central incisor were designed and fabricated using a dental CAD/CAM unit (InLab MC XL, Dentsply Sirona) according to manufacturers’ instructions and scanned in the same micro-CT scanner. 3D composite computational models of dental implants, crowns, cementation layer and simulated surrounding bone were created in a medical image processing software (ScanIP, Synopsis) using the reconstructed micro-CT images. Stress analysis was performed on the 3D models using ABAQUS (Simulia). A 100-N load was applied to the incisal edge at a 30-degree angle to the long axis of the tooth to simulate occlusal loading according to ISO 14801 testing standard. Convergence tests were performed to select the appropriate level of mesh refinement for the 3D models.
Results: Maximum 1st principal stress in the implant body was located on the buccal surface of implant between the 2nd and 3rd screw threads for both models. The ZZ implant model had a higher peak stress value than the SP model. Maximum von Mises stresses in the surrounding bone were located in the crestal bone on the lingual side for both models. The ZZ model had a higher peak von Mises stress value in the surrounding bone than the SP model had.
Conclusions: The predicted peak stresses in the surrounding bone were below the bone resorption thresholding value for both implant models. Both implant systems are predicted to be resistant to fracture when restoring mandibular central incisors under the given loading amplitude.
Methods: Two commercially available reduced-diameter one-piece zirconia implants, Straumann PURE Ceramic (SP, Ø=3.3mm) and Z-Systems Z5m (ZZ, Ø=3.6mm) were scanned using a micro-CT scanner (Skyscan1172, Microphotonics). Matching crowns for a mandibular central incisor were designed and fabricated using a dental CAD/CAM unit (InLab MC XL, Dentsply Sirona) according to manufacturers’ instructions and scanned in the same micro-CT scanner. 3D composite computational models of dental implants, crowns, cementation layer and simulated surrounding bone were created in a medical image processing software (ScanIP, Synopsis) using the reconstructed micro-CT images. Stress analysis was performed on the 3D models using ABAQUS (Simulia). A 100-N load was applied to the incisal edge at a 30-degree angle to the long axis of the tooth to simulate occlusal loading according to ISO 14801 testing standard. Convergence tests were performed to select the appropriate level of mesh refinement for the 3D models.
Results: Maximum 1st principal stress in the implant body was located on the buccal surface of implant between the 2nd and 3rd screw threads for both models. The ZZ implant model had a higher peak stress value than the SP model. Maximum von Mises stresses in the surrounding bone were located in the crestal bone on the lingual side for both models. The ZZ model had a higher peak von Mises stress value in the surrounding bone than the SP model had.
Conclusions: The predicted peak stresses in the surrounding bone were below the bone resorption thresholding value for both implant models. Both implant systems are predicted to be resistant to fracture when restoring mandibular central incisors under the given loading amplitude.