Evaluation of collagen fibers in the intra-radicular dentin of
irradiated and non-irradiated teeth. Intense loss of integrity of
collagen fibers of intra and peritubular dentin of an irradiated
tooth (A) when compared to a non-irradiated tooth (B) (Masson's
trichrome, 400x). Considerable loss of integrity of type I and III
collagen fibers in the dentin of the irradiated tooth (C) when
compared to the non-irradiated tooth (D) (Picrosirium red under
polarization, 400x).