According to Schroder, (36) lack of hemostasis before applying CH affects treatment because clots may form a barrier that prevents contact between the material and the exposed pulp
; furthermore, clots may also act as a substrate for microorganisms, leading to pulp infection.
Whereas mechanically exposed pulp
heals efficiently, exposure by carious decreases the ratio of successful treatment (4).
Furthermore, the materials that possess both optimum flow ability and antibacterial properties might theoretically eliminate residual microorganisms located around exposed pulp
without damaging pulp tissue.
When dental pulp is exposed, direct pulp capping is often performed; in this process, a compound such as calcium hydroxide is placed directly over the exposed pulp
to preserve its vitality.
In direct pulp capping the exposed pulp
was dressed with a medicament or dental material, with the specific aim of maintaining pulpal vitality and health.
In a study on young posterior teeth, Mejare and Cvek  suggested that deep carious exposures be opened up so that 1 to 3 mm of exposed pulp
can be removed and the pulp can be covered with CH.
Preserving the exposed pulp
. J Pedod 1978 Spring;2(3):217-27.