Histological sections immunostained with OPN; the green stain of OPN dominates the distal root-bone complex (right image); note staining on resorption pits and multinucleated cells on bone (right insert), resorption pits on the root (white stars), remodeling in secondary cementum (black star); on the mesial surface of the root (left image) less staining on the bone PDL interface, faint parallel lines in the bulk close to the bone surface in the mesial root-bone complex (left insert), and a single cell (left insert); cement lines stain as bright lines everywhere in the bulk bone. De = dentin, DB = interdental bone, PDL = periodontal ligament, SC = secondary cementum, and RC = root canal.
