The pulpal response to an experimental luting resin.

An experimental luting resin became available for evaluation o f its pulpal irritation potential. The ma­ terial is a high molecular weight urethane-di-methacrylate which does not require a thinning mo­ nomer such as tri-ethylene-glycol-di-methacrylate (TEGMA). In each o f 24 anaesthetized adult vervet monkeys labial cavities were cut in each o f the 8 inci­ sor teeth. In each monkey 2 randomly selected cavi­ ties were restored with one o f 4 materials — the test resin, a silicate cement and 2 commercial zine oxide/engenol preparations. Specimens were recovered from 8 animals after 2 days, from 8 animals after 28 days and from a further 8 animals after 56 days. The specimens were prepared for histological examin­ ation. The resin was found to have caused severe in­ flammatory pulpal reactions in 2 day specimens. After 56 days no inflammatory cell infiltration of the pulp tissue was observable. OPSOMMING