Study On The Accuracy Of Computer-assisted Surgical Simulation In The Treatment Of Skeletal Class Ⅲ Malocclusion

Objective:Through the quantitative analysis of the skeletal Class Ⅲ malocclusion,the actual postoperative model and the preoperative virtual model,the accuracy of the computer-assisted surgical simulation for surgical simulation and prediction is evaluated to guide the clinic,and to provide a more adequate reference basis for the accurate prediction of postoperative effects.Methods:Import the patient’s preoperative and postoperative CT data into SimPlant Pro software and use its reconstruction function to reconstruct the craniomaxillofacial 3D model,and perform operations such as bone segment cutting,movement,rotation,and measurement on the preoperative 3D model,to build a three-dimensional model of simulated post-operation.Finally,using the measurement function of the software,the accuracy evaluation system including two-dimensional linearity,angle difference,three-dimensional linearity and angle difference is designed,and the measurement items are completed,to obtain virtual postoperative data and actual postoperative data.Use statistical methods to compare actual postoperative data and simulated postoperative data.Results:After statistics and comparison of the measurement data for preoperative computer prediction virtual model and the postoperative actual model,it can be found that in the two-dimensional measurement items,the differences in the measurement indicators are not statistically significant;in the three-dimensional measurement line distance items,there is a statistical difference only between the paranasal point 0 and the zygomatic alveolar ridge point 1 to the plane of symmetry(P<0.05).The remaining 11 items include A,ANS,B1,B6R,B6L,B,Gn,Pog,L1,L6R,and L6L where have not statistical difference(P>0.05).Conclusions:1.The computer-assisted surgical simulation software Simplant Pro can effectively and accurately predict the effect of most bone tissues of patients with bony type III malocclusion,but only the prediction results of the paranasal point and the zygomatic alveolar ridge point are slightly insufficient.2.The computer-assisted surgical simulation software Simplant Pro has better accuracy in predicting the position of the skeletal class III malocclusion than the position of the teeth;the surgical design and its digital guide plate and plate applied to the upper jaw are more effective than the lower jaw;In terms of control deviation,the mid-face plane is more effective than the orbital ear plane and the coronal plane.3.Computer-assisted surgery simulation can effectively improve the accuracy and predictability of skeletal Class III malocclusion and double jaw surgery,which greatly reduces the difficulty of the original surgery,which has a wide range of clinical practical significance.