Please activate JavaScript!
Please install Adobe Flash Player, click here for download

CAD/CAM - international magazine of digital dentistry, Italian Edition, No.1, 2017

research _ computed tomography Sagittal tomographic cuts Cut 1 Cut 2 Cut 3 Cut 4 Cut 5 Cut 6 Cut 7 Cut 8 Cut 9 Cut 10 Cut 11 Cut 12 Cut 13 Cut 14 Cut 15 Cut 16 Cut 17 Cut 18 Radiographic measurements (n = 39) Mean ± SD† Bone measurements (n = 39) Mean ± SD Discrepancies Mean ± SD 25.04 ± 4.03 24.96 ± 3.93 0.16 ± 1.33 25.03 ± 4.11 25.16 ± 3.98 -0.13 ± 1.33 25.74 ± 4.24 25.98 ± 4.19 -0.24 ± 1.37 26.82 ± 4.17 27.31 ± 4.05 -0.48 ± 1.45 28.41 ± 4.35 29.17 ± 4.35 -0.76 ± 1.75 30.64 ± 4.39 30.61 ± 4.31 0.03 ± 1.39 31.31 ± 4.31 30.29 ± 4.36 1.02 ± 1.48 31.34 ± 4.57 30.09 ± 4.43 1.24 ± 1.76 31.59 ± 4.77 30.11 ± 4.74 1.47 ± 1.81 31.55 ± 4.84 30.24 ± 4.62 1.31 ± 1.71 31.32 ± 4.64 30.17 ± 4.45 1.15 ± 1.61 30.87 ± 4.53 29.83 ± 4.55 1.03 ± 1.43 29.78 ± 4.63 29.51 ± 4.65 0.27 ± 1.77 28.13 ± 4.82 28.29 ± 4.91 -0.31 ± 1.87 26.61 ± 4.75 27.02 ± 4.75 -0.41 ± 1.75 25.64 ± 4.49 25.94 ± 4.71 -0.29 ± 1.45 25.21 ± 4.56 25.37 ± 4.78 -0.17 ± 1.31 25.11 ± 4.38 25.64 ± 4.64 -0.52 ± 1.48 † SD = standard deviation. or basal (Fig. 3b), had been used. Lastly, the observers’ mean scores were calculated. _Direct mandibular measurements These measurements were taken using a digital calibrator (AMIG T304B.W-1220, AMIG, Amorebieta- Etxano, Spain). The interedges (apicalcoronal distance in mm) were measured perpendicularly from the base of the mandibular body to the alveolar ridge, along each of the lines corresponding to the tomographic slices (Fig. 3c). _Statistical analysis The data were analyzed using SPSS statis- tical software (Version 12.0; SPSS, Chicago, Ill., U.S.). Descriptive statistics were obtained for each variable. The associations between the different qualitative variables were stud- ied using Pearson’s chi-squared test. Student’s t-test for two independent sam- ples was applied to quantitative variables, in each case determining whether variances were homogeneous. Statistical significance was set at p ≤ 0.05. _Results In comparing measurements taken from the 18 tomographic slices of each mandible with measurements taken directly from the bone when the occlusal plane was used as p-value 0.25 0.085 0.106 0.498 0.389 0.611 < 0.001 < 0.001 < 0.001 < 0.001 < 0.001 < 0.001 0.330 0.524 0.345 0.144 0.251 0.500 Table 1_Discrepancies between radiographic measurements (mm) and measurements taken directly from the bone (mm) using the occlusal plane as the axial reference plane (Student’s t-test). 1_2017 19

Sito