*2.7. Qualitative Histological Analysis*

Qualitative assessment included screening the presence of BCP (Straumann® Bone Ceramic) remnants, clearly visible in the Von Kossa staining and a judgment of the vitality of the bone tissue. Moreover, the tissue was screened for inflammatory infiltrate. Three independent observers detected semi-quantitatively BCP particles and classified the particles into quartiles (<25% of BCP, 25%–50%; of BCP, 50%–75% of BCP and >75% of BCP).
