Research And Development Of Simulation Operating System In Dental Implantation

The inferior alveolar nerve canal is an important anatomical tissue of the mandible,In the operation of oral implantation drilling,the most common complication is the inferior dental neurovascular bundle,besides it’ll cause bleeding,numbness of lower lip,also affect the osseointegration of implants,therefore it must avoid the inferior alveolar nerve canal during the drilling of dental implant.But due to the complexity of anatomy of human mandible,more prominent,the different thickness of bone plate in different regions,and the difference of gray value of the jaw bone tissue that make it hard to obtain the distinct internal three-dimensional images of jaw bone tissues in the operation of implant surgery,all of these lead to the operation blind area.As a result,it’s a great practical significance to study how to avoid the inferior alveolar nerve canal during the process of implant drilling.In this paper,based on the existing CT data of human mandible,according to analysis the location of the inferior alveolar nerve canal,proposed an early warning system of oral implant drilling,it could provide preoperative planning for operator,reduce the risks in some extent and improve the success rate of oral implantation.The main research of this paper as follows:Firstly,based on the 2D image data of jaw bones of 48 cases scanned by the cone-beam computed tomography(CBCT),to rebuilt 3D model of jaw bones in the Mimics software,and then measure the location data of the inferior alveolar nerve canal from the third molar teeth region to the second premolar teeth region with the Ez3D2009 software,then combine Spss software to statistic analysis the vertical diameter of the inferior alveolar nerve canal,the distance between the inferior alveolar nerve canal wall to the top of alveolar ridge nerve canal,and the distance of the inferior alveolar nerve canal wall to buccal or lingual bone plate,in the final,obtain the statistical meaning of the different location data.Secondly,established the mandible finite element model of edentulous column include the inferior alveolar nerve canal with CBCT technology,positive or reverse engineering technology.and based on the established model,take the drilling of different depth in the region from the third molar teeth region to the first molar teeth region with the Abaqus finite element analysis software,obtain the maximum stress of nodes of the inferior alveolar nerve canal wall,lastly,to compare the influence degree of the inferior alveolar nerve canal in the drilling of different regions.Additionally,built the measurement platform of drilling force and torque that including the lower machine hardware system and upper monitor program.Take the mandible model printed by 3D technology as the experiment modelusing which get the similar stiffness with the real mandible bone,then take the process of implant drilling simulation experiment,use the force and torque sensors to obtain the signal of processing,in the final,to deal with the obtained data of drilling force and torque,get the critical force value at the 2mm distance between the drill bit to the inferior alveolar nerve canal wall,then set this value as the threshold that trigger the signal light of front panel display interface,and remind operator to know whether operate smoothly.Finally,based on the influence factor of the implant drilling force:the drill bit diameter,rotate speed,feed rate and so on.establish the prediction function model of drilling force which predict the drilling force value when the factor changed,Then evaluate and calculate the goodness of fit of this drilling force prediction model,it could be able to provide certain reference data for the clinical implant drilling surgery.