Figure 2.

(a) A band of peri-implant tissue, lined by squamous epithelium (empty arrow), showing dense connective tissue and scattered chronic inflammation. The white arrow points to a collection of granular greyish foreign material, which does not elicit a foreign body type reaction. The diagnosis was inflammatory fibro-epithelial hyperplasia. (Hematoxylin and Eosin, original magnification ×40); (b) two bands of peri-implant tissue (from a single case). The right is lined by squamous epithelium, shows dense connective tissue, chronic inflammation, and a mass of granular black material (consistent with titanium shreds). The left side shows granulation tissue and is lined by thin non-keratinizing epithelium. The diagnosis was inflammatory fibro-epithelial hyperplasia and granulation tissue. (Hematoxylin and Eosin, original magnification ×40); (c) a mass lined by squamous epithelium, composed of clusters of multinucleated giant cells in a cellular and vascular matrix (black arrow), with an area of ossification (white arrow). The diagnosis was peripheral giant cell granuloma. (Hematoxylin and Eosin, original magnification ×40).