Clinical Evaluation In Quantitative Measurement In The Dental Implant Area Using Digital Panoramic Tomography And Cone Beam Computed Tomography

Objective To compare the difference between digital panoramic tomography and cone beam computed tomography on measurement of the implant region, and then compare them with the standard values. According to the results, the study would provides the objective suggestions for accurate measurement of mandibular structures and help to reduce the risk and improve the success rate of surgery.Methods 1. To check 79 implant patients who meet the standards with OPG and CBCT. Images were took at the standard postural and head position by the same experienced radiologist to make sure the images were clear. Finally, 81 implants were selected as the research objects, 34 in anterior and 47 in posterior region; 2. The relative linear distances on OPG, CBCT panoramic radiographs and CBCT sagittal sectional images of every implant were measured by using the in-built software in OPG and CBCT, including the diameter of the healing capon and the total length of the implant. On OPG, the diameter and the total length means the horizontal and vertical distance. On CBCT panoramic radiographs, the diameter and the total length means the horizontal and sagittal vertical distance. On CBCT sagittal sectional image, the diameterand the total length means the buccolingual and sagittal sectional vertical distance. 3. The measured data were applied paired t-test to perform statistical analysis using SPSS 17 software, analyze the difference, then each set of measurements were carried out with the true value of a single sample t-test also using SPSS 17 software and analyze the difference between the true value. Taking P<0.01 for the difference was statistically significant.Results 1. There were differences between the measured data of OPG and CBCT panoramic radiographs(P<0.01); 2. There were statistical differences between the measured value and standard value on OPG(P<0.01); 3. There were statistical differences between the measured value and standard value on CBCT panoramic radiographs(P<0.01); 4. On CBCT sagittal sectional images, there were no statistical differences between the measured value and the true value in anterior region(P> 0.01), but had differences in posterior region(P < 0.01).Conclusion: 1. On OPG, all data are larger than the true value except the horizontal data in anterior region; 2. On CBCT panoramic radiographs, all data are larger than the true value;3. The vertical data measured on CBCT sagittal sectional images are more precise than which on CBCT panoramic radiographs, especially in anterior region. 4. Comparing with OPG,CBCT can be more accurate preoperative assessment of alveolar bone;...