Lec 3 Reham Sunscreen PDF

Dr. REHAM ZAYED Lecturer of pharmaceutics SLIDESMANIA.COM  SINAI university Vision The Faculty of Pharmacy - Kantara Branch, Sinai University aims to achieve...

Dr. REHAM ZAYED Lecturer of pharmaceutics SLIDESMANIA.COM  SINAI university Vision The Faculty of Pharmacy - Kantara Branch, Sinai University aims to achieve excellence and leadership in the areas of pharmacy education, scientific research, drug manufacturing and community service at the local, regional and international level SLIDESMANIA.COM  SINAI university Mission The Faculty of Pharmacy - Kantara Branch, Sinai University is committed to prepare outstanding pharmacist in the fields of the labor market and developing the pharmaceutical industry at the local and regional levels and preparing distinguished scientific research that effectively contributes in developing the environment and maximizing the use of its resources to serve the community in order to achieve the requirements of comprehensive quality SLIDESMANIA.COM and maintain the values and professional ethics and traditions of society and keep up with new science and technology  CLO Low Energy (UVA): High Energy (UVB) Sun Protective Importance Sun Block (Physical Sunscreen) Sun Screen (Chemical Sunscreen) SLIDESMANIA.COM How SPF is measured? Tanning Lotion  Sun exposure harms your skin in two major ways: 1- Low Energy (UVA): They cause skin aging and wrinkles and They also colours skin and give false sense of protection from the sun. UVA rays pass effortlessly through the ozone layer. Relatively constant during daylight hrs 2- High Energy (UVB) They cause sunburns, cataracts, immune system damage, skin cancer. They may alter melanoma that might be associated with severe UVB sunburns occurring before the age of 20. Most UVB rays are absorbed by the ozone layer.Greatest intensity between 10:00 am and 4:00 pm SLIDESMANIA.COM  Without protection long-term damage wrinkles, sagging ,‫ترهل‬ age spots, roughness, brown pigmentation, and darkening. More complications hypersensitivity reactions Golden tan is actually the earliest sign of sun damage, as the skin's outer layers darken to block out the sun. This is for people of all skin colors, and not just people with very light- colored skin. SLIDESMANIA.COM  Sun Protective Importance... In United States, sunscreen is considered a drug because it makes a drug claim help prevent Reduce the Risk of Sunburn. sunburn or decrease the risks of Prevent the Signs of Aging. skin cancer and early skin aging Reduce Your Risk of Skin caused by the sun Cancer. Sunscreens are not recommended Prevent Skin Discoloration. for infants younger than 6 months. Reduce Inflammation Infants are at greater risk than adults of sunscreen side effects, SLIDESMANIA.COM such as a rash.  Sun Block (PhysicalSunscreen) Starts working the moment Sunblock is thicker, less It sit on top of the skin but you put it on (don't need to don't deeply penetrate see-through provide be absorbed) suitable for time-pressed people the needed physical Contain zinc oxide and/or barrier. titanium dioxide blocks the For children provide better sun's rays by reflecting protection than chemical Made with heavy carrier them. Most suitable for sunscreens. oil to resist being acne-prone and sensitive Sunblock is more effective skin. washed off than sunscreen. SLIDESMANIA.COM  Sun Block Disadvantages 01 More difficult—if not impossible—to rub in completely it harder to spread sunblock all over the body Annoying if person prefer invisible sun protectant SLIDESMANIA.COM  Sun Screen (Chemical Sunscreen) Sunscreen is a chemical formula that works by absorbing into skin. It needs to be applied at least 10 minutes before sun exposure to give it ample time to sink in Have active ingredients, including oxybenzone or avobenzone that work to absorb harmful UV rays before they penetrate your skin. Do not leave a thick white sticky layer as physical SLIDESMANIA.COM sunscreens more cosmetically acceptable  Sun Screen Disadvantages Some people are sensitive to or allergic to certain ingredients in sunscreen like PABA (para- aminobenzoic acid) they may choose to use sunblock instead of sunscreen Common sunscreen organic UV filters (avobenzone, oxybenzone, etc.) were detected on the skin, in blood, in breast milk and in urine samples weeks after a single use SLIDESMANIA.COM  Sunscreen & Sunblock SLIDESMANIA.COM  SPF (Sun Protection Factor) SPF is a measure of how well a sunscreen will protect skin from UV-B rays which is a kind of radiation that causes sunburn, damages skin, and can contribute to skin cancer. Sun protection factor (SPF), defined as the number of times longer that can be spent in the sun in achieving the same degree of tanning or burning as that achieved without the product. Clinically, the degree of efficacy of a sunscreen product, as defined by its sun protection factor, is defined by the following relationship. MED * with Sunscreen Product Sun Protection Factor = MED * without Sunscreen Product * The MED or Minimum Erythemal Dose is defined as the amount of UV-B radiation necessary to cause first visible reddening of the skin. SLIDESMANIA.COM  SPF The one thing that doesn't vary between sunblock and sunscreen is sun protection factor (SPF). Sunblock and Sunscreen that are both SPF 30 the same level of protection. SPF value indicates the level of sunburn protection provided by the sunscreen product. Higher SPF values greater sunburn protection. SPF values only indicate a sunscreen's UVB protection SPF values determined from a test that measures protection SLIDESMANIA.COM against sunburn caused by UVB radiation  How SPF is measured? Measuring how long it takes before sunburn occurs when exposed to an artificial sunlight source with and without sunscreen. SLIDESMANIA.COM  2- Measures how much of the UVB radiation is blocked. For example, SPF 30 means that 1/30 (3.3%) of the UVB radiation will hit your skin, and the remaining 96.7% will be blocked by the sunscreen SPF-50 sunscreen will let 1/50 (2%) of the UVB radiation hit your skin, and block the remaining 98% of UVB radiation. SLIDESMANIA.COM  There's no sunscreen that can completely block all sun rays SLIDESMANIA.COM  What about UVA?. PA (protection grade of UVA rays) indicates the level of UVA protection More (+) signs after PA mean a higher level of protection. It's recommended to use a sunscreen with PA level of at least (+++) to prevent premature ageing and skin cancer. SLIDESMANIA.COM  Broad Spectrum Sunscreen Products UVB UVA SLIDESMANIA.COM Only broad spectrum sunscreen products with an SPF of at least 15 can reduce the risk of skin cancer and early skin aging caused by the sun when used as directed  Application TIPS 1. Always reapply. Reapplication is just as important as the first application. At least every two hours, and more often if you're sweating or jumping in and out of the water. 2. It's okay to apply more sunscreen than you should. Better to apply too much than not enough. 3. Wearing sunscreen doesn't mean you're immune to sunburn. You're more likely to get a sunburn when the sun's rays are at their most intense, during 10 a.m. and 4 p.m. 4. Sunscreens with higher SPF do not last or remain effective on the skin any longer than lower SPF and must be continually reapplied as directed, usually every two hours. 5. Protection factors are relevant only as long as the sunscreen is applied liberally and isn’t washed away by sweat, water or your towel. SLIDESMANIA.COM SLIDESMANIA.COM  Tanning Lotion Is the same as sunscreen? It's a common error ➔ suntan lotions are not sunscreen Suntan lotions are made to speed up the tanning process, rather than protect the skin. You can still get a tan while using sunscreen, but through a slower (and much safer) process. Fun fact: sunscreens with an SPF of 15 or less are often also considered suntan lotions. SLIDESMANIA.COM  Thank you! Do you have any questions? [email protected] SLIDESMANIA.COM