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Formo cresol pulpotomy in deciduous teeth 1. histo pathological observation on the human deciduous tooth pulps after formo cresol pulpotomy



Formo cresol pulpotomy in deciduous teeth 1. histo pathological observation on the human deciduous tooth pulps after formo cresol pulpotomy



Aichi Gakuin Journal of Dental Science 18(1): 1-14



Formocresol pulpotomies were performed in 26 human deciduous teeth. These 26 teeth were histologically observed regarding the changes in the pulp with time from immediately after pulpotomy to 189 days. Pathologically, 3 of 26 teeth showed a very favorable result, 15 (65.2%) moderately favorable and 8 (34.8%) unfavorable. The pulp was microscopically divided into 3 parts (the coronal third, the central third and the apical third). Unfavorable changes were observed in the coronal 3rd and these changes were reduced in the central thirds and more markedly in the apical thirds. In the evaluation of prognosis, immediately after the pulpotomy, atrophy, degeneration and necrosis of the pulps appeared only in the coronal thirds. Between the 1st day and the 1st wk, atrophy, degeneration and necrosis of odontoblasts appeared. Degeneration was often observed in the coronal thirds. Hemorrhage and round cell infiltration appeared most frequently in the central third. Atrophy, degeneration, necrosis and fibrosis were marked as compared with those of the pulps immediately after pulpotomy. Between the 1st and 2nd wk, atrophy, degeneration and necrosis of odontoblasts increased. Hemorrhage, round cell infiltration, atrophy and degeneration in the pulp also increased. Between the 2nd wk and the third mo., necrosis of odontoblasts, inflammatory changes, atrophy, degeneration and necrosis in the pulp decreased but fibrosis increased. Internal resorption was observed along the internal root wall of the pulp. Between the 4th and 6th mo., the hard tissues were formed in the pulp and these increased with time. They did not cover the whole surface of amputated pulp. Atrophy and degeneration of odontoblasts increased as compared with the previous stage. Inflammatory changes in the pulp decreased and fibrosis of the entire pulp developed.

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