Computer-aided dental implant surgical navigation system - the accuracy of the test（计算机辅助牙科植体手术导航系统,测试的准确性）.doc

1Computer-aided dental implant surgical navigation system - the accuracy of the test: Zhuo the Huangyuan Liang Gu force Xu Guohua Yan high spring Na [Abstract] The purpose of this study aims to evaluate the accuracy of the independent research and development based on three-dimensional CT images of the dental implant surgical navigation system simulation model to select the appropriate standard spiral CT scan of the image data into the navigation system reconstruction, navigation system probe to detect differences in the corresponding coordinates of the target model and the actual coordinates to calculate the depth and angle of error. Results depth measurement a total of 108 sets of data with an accuracy of 0.77 +-0.24mm, angle measuring a total of 87 sets of data, the measurement accuracy of 0.55 + -0.23 °. conclusion is based on the accuracy of the CT images of dental implant surgical navigation system to meet the clinical demand, especially preoperative planning. but needs this system further in the clinical verification. 2[Key Words] computer-aided surgery CT surgical navigation Dental Implant Surgery 3D CT can reflect the path of the dental implant surgery on the screen, this is particularly important for implant surgery, especially in edentulous implant surgery, therefore the proper cultivation path is the key factor to determine planting success of any planting direction. The angle and depth of change may have resulted in a significant decline in the cultivation of the biomechanical stability and thus affect the survival rate of implants, it is designed well in advance planting path, considering the bone and bone mass, stability and aesthetic implant restoration and the protection of important anatomical structures, nerves and blood vessels must be present, the careful and safe surgical program has been used in other medical specialties, surgery, for example: the temporomandibular joint surgery. Therefore, careful preoperative design for the accuracy of oral implant surgery is very important. In this study, mainly through the spiral CT scan, and by the probe under the premise of making a good 3marker to detect the difference of the target coordinates in the research model, to calculate the navigation depth and angle of deviation. 1 Materials and methods 1.1CT scanning and three-dimensional reconstruction with the production of plexiglass material, the side length of 20 cm cube, which the two vertical angles on three sides marked with a scale accurate to the millimeter, five side of a closed cube, side window, built-in three plexiglass panels, the specification were 150mm × 150mm, 100mm × 100mm and 180mm x 20mm, engraved scale. Random paste the coordinates of the gutta percha in the use of outside surface to navigate the registration, the experimental model of a CT scan. Scan center in the center of the model, do the level of clearance, continuous scan, the slice thickness is 2.5mm. The image data into the navigation system, three-dimensional reconstruction. 1.2 The test method uses the six position 4coordinates of the navigation system of the registration, the registration is completed recorders significant error, navigation needle tips were placed in the positioning target, read the tip on the screen coordinates and record the testers. test eight times each, a total of 108 groups have depth data, angle data of 87 groups. calculation and statistical analysis of all data SPSS11.5. 2 Results 108 coordinates were measured on a plexiglass model of 2.1 depth measurement, the average error is 0.7719mm, the standard deviation of +-0.24358mm statistics and experiment shows that the maximum error is 1.800mm, the smallest error can be less than 0.2mm, as 0.032mm error range between 0.4mm ~ 1.2mm. 2.2 angle measurement to measurement of 30 °: 24 sets of data; 45 °: 28 sets of data, 60 °: A total of 20 sets of data, measurement of ancestral punctuation 87 points, the average angular error of .5541 °, the standard deviation of + -0.22996 °. Statistics and experimental results available in: 1.4001 ° angle error measurements 5are mostly concentrated between less than 0.2 ° and 0.4 ° ~ 0.8 °. Share Free paper Download Center 3 discussions Planted navigation accuracy is affected by many factors in the process of measurement of CT image slice thickness, image transmission in the process of deformation and different registration method will produce different levels of navigation accuracy, contrary to the testing process technology and the software itself, the impact of factors on the navigation is much smaller registration error in terms of basis points and the corresponding sites of displacement error than simple image processing on the alignment using the probe for the determination larger error for the choice of registration points: external basis points better positioning technology for navigation, better than its much more effective than a simple select anatomical si。