Fig. 2

(a) A sample of group I (NeoMTA Plus®) after one week showing bridging of the furcation defect by prominent calcific tissue (thin black arrows) that overlying areas of heavily deposited collagen bundles (green arrow), onset of condensation of fibrous tissue into a hyaline matrix of hard tissue formation (blue arrow) and normal histologic morphology (yellow arrow). (b) A higher magnification of the same sample in Fig. 2a showing diffuse patchy calcifications at the furcation defect (white arrow), dense collagen fibers (yellow arrow) around blood vessels (blue arrow) and very scanty inflammatory cells (black circle). (c) A sample of group II (MTA Angelus) after one week showing plugging of the furcation defect by dense fibrous tissue, horizontally oriented collagen bundles (green arrow) and regular morphology of the interradicular bone (yellow arrows). (d) A higher magnification of the same sample in c showing fairly calcified fibrous tissue (red arrows), plump fibroblasts and scar tissue formation (yellow circle) [H&E, X4 (a, c) and X40 (b, d)]