Rainfall simulator is a device used to create artificial rain to support variations of rainfall intensity and duration of rainfall variations automatically. Variation of pressure used was 2.5 psi, 3 psi, 3.5 psi, 4 psi, 4.5 psi, 5 psi, 5.5 psi, 6 psi, and 6.5 psi. Parameters used to study about the performance of rainfall simulator are rainfall intensity, the diameter of the raindrops, rain mas…
Plaque is a thin film on the surface of a tooth containing a variety of microorganisms. At cm early stage, plaque containing only microorganisms gram-positive facultative then will happen growth and maturalion of the plaque, so microorganisms turned into gram-negative facultative, gram-negative anaerobic and spirocheta. These microorganism will disturb the balance of the oral cavity its cause t…