Fig. 5. High power, histological image of the retrieved specimens belonging to (A) Underprepared site: bone tissue in contact with the implant surface could be observed. The bone structure seemed intact; only in some fields, small bone chips were present. (B) Normal preparation: the implant was in contact with small bone trabeculae, which were not damaged in some fields, whilst in other they appeared slightly deformed and followed the implant concavities. (C) Tapped site: many bone chips close to the implant surface could be observed. Only in some fields, bone trabeculae in contact with the implant could be seen. (Under toluidine blue and acid fuchsin. Original magnification ×40).