网格简化对口腔种植机器人手术规划与操作中模型精度的影响OA

Objective:To evaluate the effect of mesh simplification on the accuracy of digital models in dental implant robot-assisted surgical planning and operation.Methods:Ten maxillary dentate plaster models and ten maxillary edentulous plaster models were scanned using an intraoral scanner and saved as stereolithography(STL)files to serve as reference models(R0).The original models underwent mesh simplification using Geomagic software,reducing the mesh count to 75％,50％,25％,and 10％of the original file respectively.The number of triangular facets,vertices,and the file size of each simplified model were compared,and the three-dimensional(3D)root mean square(RMS)deviation between these models and the reference model was calculated.Results:The number of triangular facets and the STL file size were negatively correlated with the degree of mesh simplification.As the mesh count decreased,the 3D deviation gradually increased.When mesh simplification did not exceed 50％,the median deviation for both maxillary dentulous and edentulous models was less than 0.005 mm.At 75％simplification,the median deviation for maxillary dentulous models was 0.0097(0.0067,0.0126)mm and for maxillary edentulous models,0.0059(0.0026,0.0061)mm.At 90％simplification,the median deviation rose to 0.2264(0.2060,0.2934)mm for maxillary dentulous models and 0.1019(0.0962,0.1302)mm for maxillary edentulous models.Conclusion:Mesh simplification has a greater impact on the trueness of maxillary dentate models compared to edentulous models,particularly evident in structurally complex areas such as cusps and fissures/pits.The accuracy of dentate models is more sensitive to mesh simplification.When the degree of mesh simplification exceeds 75％,the model's morphological trueness decreases significantly,which may further affect the registration accuracy of the implant robot.