Three-dimensional Stress Analysis Of The Surrounding Bone Of Implants With Different Angled Abutments Under Dynamic Loads

Objective To provide theoretical references of biomechanics for clinical application of implants with angled abutments,a finite element method(FEM)was used to analyze the stress and strain on bone tissue surrounding implants with angled abutments.Methods Construct the three-dimensional finite element models of mandibular first molar implants with different angled abutments(angles of 0 degree,10 degree,20 degree,30 degree and 40 degree)and surrounding bone tissue,with CBCT technique,Mimics software,Geomagic software,Solid Works software and Ansys Workbench software.Finite element analysis was performed on the models under dynamic loads to explore the stress and strain as well as their distribution of the bone tissue surrounding implants.Results 1.9 three-dimensional finite element models of mandibular first molar implants with different angled abutments and surrounding bone tissue were established.They were named M0°?MM10°?MM20°?MM30°?MM40°?MD10°?MD20°?MD30°?MD40°,that were good in geometry and mechanics,which met the needs of the EFA.2.Under dynamic loads,the stress peaks of the bone tisse of M0°?MM10°?MM20°?MM30°?MM40°?MD10°?MD20°?MD30°?MD40° were 36.546?37.032?44.865?49.851?55.205?42.351?47.359?54.362?61.238 MPa,which appeared in the cervical cortical bone of each model.The stress increased with the increase of the angles.3.Under dynamic loads,the strain peaks of the bone tisse of M0°?MM10°?MM20°?MM30°?MM40°?MD10°?MD20°?MD30°?MD40° were2744.5?2758.5?3440.7?3705.0?4213.4?3139.5?3462.2?4077.3?4548.6?strain,which appeared in the cervical cortical bone of each model.The strain increased with the increase of the angles.4.Under dynamic loads,the stress peaks of the cancellous bone of M0°?MM10°?MM20°?MM30°?MM40°?MD10°?MD20°?MD30°?MD40° were 2.4295?2.9561?3.2689?3.0598?3.3489?2.9383?2.853?3.3397?3.7838 MPa.The high stress areas were in the cervical and bottom bone of each model.5.Under dynamic loads,the strain peaks of the cancellous bone of M0°?MM10°?MM20°?MM30°?MM40°?MD10°?MD20°?MD30°?MD40° were 1800.9?2191.3?2414.8?2266.5? 2866.5?2171.3?2104.7?2842.8?3237.8?strain.The high strain areas were in the cervical and bottom bone of each model.Conclusions 1.It was feasible to use CBCT,Mimics,Geomagic,Solid Works and Ansys Workbench software to conduct three-dimensional finite element models of mandibular first molar implants with different angled abutmentsand surrounding bone tissue.2.Under dynamic loads,the stress was concentrated on the cervical cortical bone;the strain was concented on the cervial and bottom bone tissue.3.Under dynamic loads,the stress and strain of the surrounding bone tissue increased with the increase of angles.4.It was suggest that used no more than angle of 20 degree abutment clinically.