difference between paste and ointment
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Difference between Pastes and Ointments:
Pastes contain a large amount of finely powdered solids such as starch, zinc oxide, and calcium carbonate; whereas, ointments contain medicaments which are generally dissolved / suspended / emulsified in the base.
Pastes are very thick and stiff; whereas, ointments are soft semisolid preparations.
Pastes are less greasy; whereas, ointments are greasy.
Pastes are generally applied with a spatula or are spread on lint; whereas, ointments are simply applied on the skin.
Pastes form a protective coating to the area where it is applied; whereas, ointments are used as protective or emollient for the skin.
Paste contains a large amount of powder which is porous in nature, allowing perspiration to escape; whereas, ointments are used for the protection of lesions.
Pastes are less macerating in nature; whereas, ointments are more macerating in action.
Types of Ointment Bases
There are five (5) classes or types of ointment bases, which are differentiated on the basis of their physical composition. These are:
oleaginous bases
absorption bases
water-in-oil emulsion bases
oil-in-water emulsion bases
water soluble or water miscible bases
Each type has a different physical characteristic, as well as therapeutic uses, based on the nature of its components.