Avaliação da densidade óssea dos maxilares por meio da escala tomodensitométrica em exames de Tomografia Computadorizada Cone Beam (CBCT).

Resumo (EN)

Surgical planning in order to implant placement requires information on bone density that is directly related to future primary stability. The authors analyzed the bone density in the anterior and posterior mandible and maxilla by means of cone beam computed tomography (CBCT). The retrospective study of 50 patients (25 examinations of subjects were female and 25 male) aged between 30 and 40 years was carried out by applying about two hundred transaxial slices with a thickness of 2mm to bone density tool software Xoran CT i-CA T scanner in the anterior (50) and later (50) of the jaw and above (50) and later (50) of the jaw. The Hounsfield scale with 4096 shades of gray was used in the central transaxial each cut. The data obtained were compared with results of other authors in the literature in order to assess the correlation between the technique of conventional tomography and cone-beam computed tomography. Toe values found in this study were: anterior jaw 562.2 HU (SD: 3.3); anterior maxilla, 531.3 HU (SD: 2.8), posterior mandible, 503.8 HU (SD: 3.0); the posterior maxilla : 394.5 (SD: 2.9). The data were subjected to statistical evaluation to determine the correlation between our findings and the findings in the literature presented in tabular form, the t test was used to obtain statistical data about the male and female, Pearson correlation analysis was used to evaluate the difference between observer 1 and 2. Thus there are no statistically significant differences (p> 0.05) between the densities of the anterior and posterior regions and the values consistent with previous studies with fan­ beam CT, but the standard deviations found were smaller and thus presenting a lower variability in thickness when the use of CBCT in surgical planning.