Hydroxide. Nirschl et al reported that a high rate of success (94.4%) can be seen in cases done with calcium hydroxide. The mode of action of Ca(OH)2 on bacteria is not yet completely understood. Yet, it is able to practically avert the caries process.
Direct pulp capping Involves the application of a medicament to the exposed pulp in an attempt to pre-care vitality. Observe has described the histopathology of the pulp and concluded that the cells of the pulp are the same as those of loose comparative tissues and that these cells could differentiate and that healing could occur in the dental pulp.
In 1930, Hermann introduced calcium hydroxide as a successful pulp-capping agent.
In 1938, Tauscher and Zander introduced calcium hydroxide in the United States and historically confirmed complete dentinal bridging with healthy radicular pulp tissues leading to degeneration.
According to Mo Walter et al, the advantage of calcium hydroxide is when applied to exposed pulp, it does not exert a persistent stimulating