Modeling And Simulation Orthodontic Forces Of Orthodontic Wire Herringbone And T-Shaped Combination Loop In Orthodontic Treatment Of Canine Underbite

Fixed orthodontic technology is the most effective method for the treatment of anti jaw teeth at present,which mainly uses the orthodontic force released by the orthodontic wire to achieve the purpose of reserving the orthodontic space and recovering the anti jaw teeth.In the dental cross jaw malformations,canine cross jaw accompanied by dentition space is the most common dental cross jaw malformation.The most important treatment link is to control the tooth rotation of the upper incisor segment through the orthodontic wire and loop,to reserve space for the recovery of mandibular cross jaw canines,and to close the upper dentition space at the same time.In this link,the herringbone and T-shaped combination curve are usually used as the correction curve for this step.Therefore,before clinical orthodontics,if we can determine the release of correction force of herringbone and T-shaped composite loop,we can provide orthodontists with theoretical reference for the treatment of canine orthognathism,so as to ensure the safety of canine orthognathism.Based on the above situation,this paper has carried out research from the following aspects.The establishment of theoretical model of orthodontic force of canine crossbite.The deformation process of herringbone and T-shaped composite loop is analyzed.The deformation process is divided into elastic deformation and elastic-plastic deformation,and the differential equations of orthodontic force under the two kinds of deformation are constructed.The mechanical analysis is carried out for herringbone and T-shaped composite loop,and the released orthodontic force is divided into two types: clearance orthodontic force and overturning orthodontic force.Based on the area division method and the differential equation of orthodontic force,the clearance orthodontic force and overturning orthodontic force are calculated.The theoretical models of herringbone and T-shaped composite curves are established,which provides a theoretical reference for the bending of herringbone and T-shaped composite loop.Simulation of the orthodontic force of the herringbone and T-shaped combined curve in canine anti jaw orthodontic.The solid model and finite element model of the herringbone and T-shaped composite loop of the orthodontic wire were established,and the herringbone and T-shaped composite loop were analyzed through the Workbench static module,and the magnitude of the orthodontic force released on both sides of the herringbone and T-shaped composite loop under displacement load was obtained.The correctness of the theoretical model of the orthodontic force of herringbone and T-shaped combined loop was verified.The measurement experiment of orthodontic force of herringbone and T-shaped combined loop.According to the characteristics of herringbone and T-shaped composite loop and three-dimensional reconstruction dentition,the bending scheme of herringbone and T-shaped composite loop was determined,the experimental measurement platform of herringbone and T-shaped composite loop was established,and the measurement of closed space correction force and overturning orthodontic force was completed based on the wax jaw dyke.The rule between the orthodontic force and the bending angle of the herringbone curve,and the parameters of the archwire section was summarized in the experiment,and the similarities and differences of the orthodontic force released from the left and right sides of the herringbone loop and the T-shaped curve were compared.The experiment verified the correctness of the theoretical model of herringbone and T-shaped compound loop,and provided a reference for the treatment of canine crossbite.Safety evaluation of the correction force of herringbone and T-shaped combined loop.Through the method of reverse reconstruction,the three-dimensional reconstruction of the maxillary dentition of canine cross bite was carried out,and the solid models of alveolar bone,teeth and periodontal ligament were established.Based on the Ogden hyperelastic model,the periodontal membrane material was constructed and the boundary conditions were determined.Through the finite element method,the closed space orthodontic force and overturning orthodontic force were applied to the dental model,and the pressure on the periodontal membrane was obtained.Finally,the safety of herringbone and T-shaped combination loop was determined based on the capillary pressure of periodontal membrane,which provided a reference for the clinical treatment of canine crossbite.