Reconstruction And Application Of 3D Integrating Model Containing Jaws And Teeth Roots

The 3D printing technology has been widely used in the field of stomatology.Based on the 3D printing and stomatology,the research of integrated technology has gradually been a hot spot in the areas of the invisalign and design of implant surgical guide.However,the dental models used in invisalign process mostly are crown models for the study,not included in the teeth roots and jaws.This imperfect treatment may result in some hidden dangers,such as teeth roots non-parallelism,fenestration,which will impact orthodontic effect.Meanwhile,the digital design of implant surgical guide also depends on the reconstruction of 3D integrating model containing jaws and teeth roots.The reconstruction technique of 3D integrating model containing jaws and teeth roots has been one of the key technologies to solve the digital oral medical technology.By using the CT technology and reverse engineering technology,the reconstruction technique of 3D integrating model containing jaws and teeth roots is studied and the integrated models are applied to the invisalign and design of implant surgical guide.The design accuracy is improved by using the integrated models.Firstly,the data acquisition methods of dental models is summarized.The different acquisition ways which obtained three-dimensional data of the teeth roots,jaws and crowns are explored.The data of root models and jaw models is collected by using the CT,and the data of crown models is obtained by the optical scanning.Secondly,the reconstruction method and the registration technology are studied for 3D models of the teeth roots,jaws and crowns.3D integrating model containing jaws and teeth roots is reconstructed in mimics software,by adjusting the image window width and position and the thresholding,and by using the maximum variance threshold method.With the support of the Geomagic software,by using the method of the application feature point stitching combined with the automatic registration of global technology,the crown models,the root models and the jaw models is conducted the best fitting.3D integrating model containing jaws and teeth roots is reconstructed.Thirdly,in the invisalign,by using the object mover and the triangular faces repair technology,3D integrating model containing jaws and teeth roots is achieved to separate and move a single tooth.Under the principle of the removal transformation of a single tooth in the three dimensional space,the virtual treatment of software applications is realized.Finally,in the implant prosthesis,using the implant system of 3-shape Company,the size of the implant is selected.The implant is moved to the right place in the conditionof CT data fully displayed,and the orientation of the implant is determined.The joint surface is selected.The implant surgical guide which contains implanting information is formed by thickening and other functions.Based on the size of the implant and the tolerances of mutual cooperation between the parts and other information,the parts of the guides are designed.Through the research of reconstruction technology of 3D integrating model containing jaws and teeth roots,the invisalign which contained the information of the roots and the jaws is achieved,which provided the solution for avoiding the roots non-parallelism and exposure of the teeth roots in the invisalign process.Meanwhile,the implant surgical guide is designed which contains the information of the position,direction,and depth of the implant,which improves a simple,accurate positioning method for implant surgery and lays the foundation for the future clinical trials.