ferric sulphate gives very good clinical and radiographic results with high tooth survival rates and with no statistically significant differences from that of formocresol. Internal resorption is a common radiographic finding in both ferric sulphate and formocresol treatments with no statistically significant differences between them. However, internal resorption differs in size and progression rate among teeth. There were cases reported in which the size of the internal resorption was very small and unchanged over time, and even cases where the area of the resorption was self-repaired with hard tissue. Some of the authors considered only teeth with progressing and/or extensive internal resorption as failures, while small size and unchanged with time internal resorption was not considered as failure. it is suggested that ferric sulphate be used, rather than formocresol, for pulpotomies of primary teeth as the latter has been blamed for systemic and local side effects on the developing successors.
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