This in vitro dental study tested whether pretreating enamel with a neodymium-doped yttrium aluminum garnet laser changes the whitening effect of 35% hydrogen peroxide on tea-stained extracted teeth. Yttrium appears only as part of the laser crystal; no yttrium exposure was studied.
Key numbers
This paper reports no numerical findings relevant to yttrium exposure.
Methods (brief)
Teeth were stained, laser-treated or not, bleached and assessed for color change with a spectrophotometer.
Evidence fitness
Off-topic for dietary exposure: a dental laser study that does not support dietary exposure or toxicity claims for yttrium.
Limitations
Thirty teeth in vitro; yttrium was not measured.
Related evidence
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