Dynamic and fatigue analysis of implants with different crown root ratios in molar region
WANG Sai
HAN Jing-yuan
DONG Mei-xi
RU Xiao-na
WANG Xin-yu
GAO Shi-jun
Abstract：Objective To investigate the influence of different crown root ratio of implants on the stress of implant system and surrounding bone during secondary restoration under the same length of implants in the molar region,so as to obtain the most suitable crown root ratio interval in the molar region,providing a new idea for increasing the clinical life of implants.Methods The abutment,central screw,implant,cortical bone and cancellous bone stresses,fatigue life and safety coefficients of implant systems with crown-root ratios of 1∶1.5,1∶1,1.5∶1,2∶1,2.5∶1 and 3∶1 were comparatively analyzed by a three-dimensional finite element method.Results Under dynamic loading,the forces on implant components and surrounding bone increased with the increase of crown root ratio.The implant system stress is concentrated at the joint of abutment and implant.The fatigue life and safety factor decrease with the increase of crown root ratio.Conclusion Fatigue fracture at abutment-implant junction is one of the potential risks of implants when the ratio of crown to root is greater than 1.When the crown root ratio is less than 1,the implant components can obtain a good prognosis and long-term effect.However,due to the particularity of finite element method,it needs to be further studied in clinic.
Keywords：Crown-root ratioAbutmentImplantsCentral screwFinite element analysisFatigue life
Publication Date：2024-01-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 37-41 )