1030 week 11
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8 Terms
Extrinsic stain causes
Food/drink, oral hygiene, tobacco, antimicrobial rinse (chlrohexadine)
Green stain
Plaque, pellicle, food debris, pigment producing bacteria
Intrinsic cause
Development disturbances (trauma, Fever illness, excessive fluoride intake, meds), hereditary, age
Yellow/brown intrinsic vs blue/gray intrinsic
Development defect, necrotic tooth, age vs tetracycline leached amalgam
Yellow/brown is easier to whiten
How whitening works
Peroxide or other whitening material passes through the spaces in enamel and reaches dentin where it releases oxygen free radicals that oxidize the stains and lighten dentin color
Enamel composition
Almost entirely of mineral (97% by weight)
Carbide peroxide
Popular for home whitening
weaker oxidizing agent than hydrogen peroxide
10% carbamide = 3.5% hydrogen
