Optimization And Preliminary Application Of Finite Element Analysis-based Oral Implants In Animals

An oral implant is a device that is surgically implanted in the jawbone of a missing tooth site with a titanium alloy material to install a prosthetic denture.A reasonable stress distribution at the implant bone interface enhances the bond between the bone tissue and the implant,strengthens the stability of the implant,and thus improves the implant success rate.The Finite Element Analysis(FEA)method is a digital calculation method that uses computers for aiding design,constructing research models to simulate mechanical processes and performing mechanical analysis.The FEA method can be used to change the experimental conditions based on a reasonable modeling,and it is possible to perform repeated calculations and adjust the size of the parameters,which shows its great superiority in the study of human biomechanics.At present,the finite element analysis method has become an important tool in the study of oral biomechanics.In order to further investigate the possibility of the theoretical use of implant placement in different animals,the following experiments were carried out:Experiment 1 Finite element analysis and optimization of implant implantsFirstly,by modeling the mandibles of Beagle dogs in the modeling software Solid Works 19.0,implants with different radii and different thread types were modeled,implant sockets with different angles were created and assembled separately and then subjected to finite element analysis to derive the magnitude and distribution of equivalent force and equivalent elastic strain.The results showed that the optimal implant angle was64°-66° for tilted implants,and the optimal thread type for Beagle implants was anti-facial wall shape with a radius of 1.75 mm.Experiment 2: Feasibility and optimization of implant placement in experimental animalsFirstly,by modeling and assembling the mandibles and implants of Beagle dogs,Chinese Field cats and SD rats in the modeling software Solid Works 19.0,the implant implant models of different experimental animals were obtained and imported into the analysis software for finite element analysis to derive the magnitude and distribution of equivalent stresses and equivalent elastic strains in the mandibles of different animals undergoing implant placement.The results showed that all three animals could be used for implant placement based on the equivalent elastic strain values.Experiment 3 Finite element analysis and optimization of implant placement in wild animalsThe mandibles of different wild animals were modeled,implant sockets were established and assembled to obtain implant implant models of different wild animals,which were imported into the analysis software for finite element analysis.At the same time,different radius implant models of giant pandas were modeled in the modeling software,implant sockets were built and assembled,and then imported into the analysis software for finite element analysis.The magnitude and distribution of the equivalent force and equivalent elastic strain were derived,respectively.The results showed that all 12 wildlife species involved in the experiment were suitable for implant placement with a 7.5mm radius of contra-supported threaded implant;in the giant panda implant placement,contra-supported threaded implants with radii of 7.5 mm and 8.3 mm were the most suitable implants for third molar defect placement.Experiment 4: Beagle mandibular premolar implant placementA model of a missing Beagle mandibular premolar was established and implants were placed in the premolar area of the missing Beagle.Oral DR films were taken after the implantation to evaluate the integration of the implant with the mandible.The results showed that the Beagle had no systemic symptoms and good wound healing after implantation of mandibular premolars in Beagles using a 1.75 mm radius contra-facial threaded implant.Conclusions:(1)Finite element analysis of implant placement in Beagle,Chinese Field Cat and SD rat determined that all three animals can be implanted,and the optimal implant angle for inclined implant placement is 64°-66°.(2)The FEA of implant placement in 12 wild animals determined that all animals involved were suitable for implant placement with a radius of 7.5 mm;(3)in the giant panda implant placement,the implants with a radius of 7.5 mm and 8.3 mm were the most suitable implants for third molar defects;(4)under experimental conditions,the Beagle mandibular premolar tooth loss model could be placed with a threaded implant with a radius of 1.75 mm.implant placement.