Efeitos dos diferentes thresholds na acurácia de análises lineares e volumétricas de biópsias de osso nativo e enxertado com osso bovino desproteinizado.

Abstract

The aim of this study was to investigate the accuracy of microtomography to evaluate in a linear and volumetric areas of native bone and grafted in biopsies of maxillary sinuses grafted with deproteinized bovine bone (DBB) in humans and its correlation with histometric analysis. A total of 111 biopsies of the previously grafted maxillary sinuses were collected from 19 patients. Linear analyzes in the area of native bone were correlated and grafted from the microtomographic and histometric analyzes. In addition, specifically in the volumetric analysis, there were variations in the thresholds (Gray scale) between 90-250, reducing the point of the upper limit until the interval of 90-150. In the microtomographic analysis, the linear length of native bone and grafted bone was 2.44 ± 0.91 mm and 3.63 ± 1.66 mm, respectively, whereas in histometric analysis, the length of native bone was 2.48 ± 1.50 mm and bone grafted was 3.13 ± 1.45 mm, which generated a correlation level of r = 0.57 in native bone and r = 0.74 in the grafted area. Histometric analysis showed a percentage of bone of 45.91 ± 11.69% in the native bone area, and 49.57 ± 5.59% of bone and biomaterial in the grafted area. The total volume of mineralized tissues that were closest to the values of the histometric analysis were 43.75 ± 15.39% in the native bone area (Threshold: 90-240) and 51.68 ± 8.42% in the grafted area (Threshold: 90-180). The level of correlation between these analyzes was positive and significant (r = 0.50) in native bone and non-significant (r = -0.028) in the grafted area. The microtomographic analysis showed good accuracy in the linear analysis in both portions of the biopsies. However, the volumetric analysis showed good accuracy only in native bone.