Occlusif

Occlusif is a French adjective meaning occlusive, relating to occlusion or the act of closing or sealing. In English-language contexts it is commonly rendered as occlusive. The term is used in several fields to describe things that form a barrier or seal.

In dermatology and cosmetics, occlusifs are substances that create a barrier on the skin to reduce transepidermal water loss (TEWL) and protect irritated skin. They help to maintain moisture and can enhance the efficacy of moisturizers and active ingredients when used appropriately. Typical occlusive ingredients include petrolatum, mineral oil, lanolin, silicones (such as dimethicone), and waxes. Occlusives are often combined with emollients and humectants in barrier creams and moisturizers. They are especially useful for dry skin, eczema, and during wound or post-procedure healing, but can be greasy or potentially comedogenic for some users, and may cause irritation if additives are present.

In dentistry and oral health, occlusif is used to refer to things related to occlusion—the contact between teeth during biting and chewing. In English, the corresponding term is occlusal. Examples include the occlusal surface of a molar or occlusal adjustment. The concept is central to bite alignment, tooth wear, and temporomandibular joint health.

In pharmacology, occlusion can describe dressings or patches that form a barrier to modify or enhance transdermal drug delivery. Occlusive systems can increase skin hydration and influence the rate of drug permeation.