Abstract
Background: alterations of the enamel after topical application of bleaching agents, presenting as major consequences are: ions release, increased superficial roughness, stronger bacterial attachment and hardness alteration. The aims of the study were to evaluate the effects of two different types of bleaching agents for vital teeth by using with light source on the release of ions (Calcium and phosphate ions) from the enamel surface. Materials and methods: Fifty three sound enamel surface for calcium ions release and Fifty three sound enamel surfaces for phosphate ions, were subject to treated with bleaching agents (35% hydrogen peroxide and carbamide peroxide) and then application of light and laser radiation to activate the bleaching agents. Spectrophotometer and Buck scientific atomic absorption spectrophotometer were used to measure the ions release from enamel surface. Results: highly significant increase in the release of ions (calcium ions), while significant increase in the release of ions (phosphate ions) in relation to the times intervals. Conclusions: In this study showed that release of calcium ions from enamel surface after treated with both 35% carbamide peroxide and 35% hydrogen peroxide increase with increase the time and compared with release of phosphate ions release and control groups.
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