sunscreens
the ozone absorbs...
90% of UVB 100% of UVC and NO UVA
chemical / organic products what do the absorb generally?
absorb > 85 % of UVB -some work on UVA also
what CHEMICAL SUNSCREENS absorb UVB?
cinnamaates PABA padimate O salicylates
when do you recommend SPF 15?
at least a minimum to prevent cancer
what CHEMICAL SUNSCREENS absorb UVA rays?
avobenzone (UVA1) meradimate ensulizole
what CHEMICAL SUNCREENS absorb BOTH UVA AND UVB?
ecamsule (UVB, UVA2) Drometrizole (UVB, UVA2) Bemotrizinol (UVB, UVA2) Benzophenones (UVB, UVA2) * inorganic suncreens are the only ones that absorb both / all of UVA/UVB!
higher than SPF 50? like 80?
greater than 50 offers minimal benefit, covers 99% of UV rays so there is no clinical difference between 50 and 80.
what are the recommendations for sunscreens/application?
in general, need about 6-9 portions (teaspoons) per total body application apply at least 15-20 minutes prior to sun exposure overheating is possible with oily vehicles that clog pores
when do you recommend SPF 30?
light skin burn easily AAD recommends for everyone
SPF.... what does it measure?
sun protection factor it measures how well you block UVB only (basically tells you how well it protects you from those rays) NOT a measure of UVA protection as you increase SPF from 15-30-50 it is not linear ex) SPF 15 blocks 93% of UVB SPF 30 blocks 97%
when are UVB rays most intense?
10am-4pm
reapplication of sunscreen guidelines
-reapply every two hours or after towel drying no matter what 1) if the sunscreen is water resistant, apply sunscreen after spending 40 minutes in the water 2) if the sunscreen is very water resistant, apply sunscreen after spending 80 minutes in water 3) if sunscreen is NOT water resistant, reapply every time you get wet
what are the two different types of sunscreen products?
1) chemical/organic 2) physical/inorganic
what are the three vehicles/types of sunscreen?
1) cream-based -- more resistant to removal by water than alcohol based 2) oil-based-- easier to apply but lower SPF value 3) aerosol-- can cause injury to lungs; caution using with kids that are asthmatics, also can have gaps because you don't exactly know where you are spraying. (but they are very convenient)
what are the medications that increase PHOTOSENSITIVITY? (increase sensitivity to the sun)
Never ----> NSAIDS Taste ----> tetracyclines Ass------->antineoplastics (chemo agents) Said----> sulfonamides Arshia----> anti acne The-----> thiazides ******* ---> antipsychotics
what are the best examples physical/ inorganic sunscreens?
TITANIUM DIOXIDES or ZINC OXIDES
which UV penetrates deepest in the skin?
UVA
which UV is responsible for immune suppression and DNA damage and aging?
UVA *plays a role in premature AGING and skin damage.
which UV is at constant amounts during the day?
UVA intensity is constant, there is not necessarily a peak time.
what does broad spectrum cover?
UVA 1 UVA 2 UVB
broad spectrum sunscreens protect against?
UVA and UVB
which UV is most responsible for skin cancer and burns?
UVB
which UV is responsible for vitamin D3 synthesis in the skin?
UVB
physical/inorganic sunscreen products
they have nanoparticles that make them a little harder to apply they reflect light, both UVA and UVB ALWAYS BROAD SPECTRUM
when do you recommend SPF 50?
very fare skin or more risk factors for skin cancer
