Development Of The Cranio-Maxillofacial Complex And Biomechanical Effect Analysis Of The Maxillary Defect Reconstruction

Due to the differences,diversity of human skull and limitations of the invivo experiments,it is very difficult to carry out the study work. At thesame time, with the improvement of medical conditions,the variety ofclinical surgical methods continue to emerge, and how to evaluatepostoperative results becomes important research tasks to relative medicalscholars.Of course, large area maxillary defects are usually caused bycongenital or acquired orthopaedics diseases and seriousaccidents,affecting the patient’s face and chewing function.There are manymandibular defect reconstruction methods, in which the prosthesis is atraditional way. The success of prosthetic repair lies in the retention of theprosthesis. But existing retentions have some shortcomings such as badretention effect or hook with inconvenience, which is a impediment to theclinical application. Now zygomatic planting technology for maxillarydefects bring breakthrough.It present a better therapeutic effect andexcellent retention force with force,but the effect of reconstructionbiomechanical mechanism is unclear.This paper set biomechanical evaluation of prosthetic reconstructionresults as a starting point,followed with such work:1) Establish a completemaxillary complex three-dimensional geometricmodel and finite element model based on CT data,which will provide aplatform for the maxillary complex research later.2) Verify the correctness of the model with the feasibility of the skullmaerial parameters given by bone through biomechanical analysis. 3)Establish a hemi defect maxillary model and design a rehabilitationproganm for the hemi defect model.Prosthesis,the combined claspaggregate bracket,I card,lever card,zygomatic implants are all the baisicunits.Then the snap ring prosthetic,rod cassetee prosthesis,zygmaticimplants supported prosthetic treatment sutraditional retentionmethods,clasp retention are completed.4)Fix the pros and cons from a biomechanical perspective: the abutmenthave a large force with the snap ring or rod locking bit prosthetic, the ringmay fall off when chew. The stress distribution with the zygomaticplating clasp united retention repair meet the biomechanically transfer law.The results show that the differengt retention programs hae differentbiomechanical properties.This analysis provide theoretical support foroptimizing the design of the reconstructiong structure and clinicalapplication.