“…The subsequent behavior of the dental papilla and its derivatives in allogeneic environments is extremely variable and has led to much confusion. Similar behavior to autografted and isografted tissue has been reported; namely recovery and renewal of dentinogenesis (Fong & Agnew 1958, Hoffman 1960, Ivanyi 1965a, Hoffman 1966, 1967, Weinreb et al 1968, Macedo-Sobrinho & Iranpour 1971. A number of authors have also observed that fibrous replacement of the pulp takes place (Ivanyi & Vacek 1964a, Ivanyi 1965a, 1965b, Fong et al 1968, Mincer & Jennings 1970.…”