Effects of a bleaching agent with calcium on bovine enamel.

摘要: Objective: This in vitro study analyzed the effects of a bleaching treatment containing 35% hydrogen peroxide (HP) with or without calcium on bovine enamel, using Knoop hardness number (KHN), tristimulus colorimetry (TC), and scanning electron microscopy. Materials Methods: Forty-five specimens were randomly divided into groups ( n = 5), which included artificial saliva (negative control [NC]), HP (positive [PC]), Blue Calcium (HP Blue). The subjected to three sessions. During sessions, immersed at 37°C. Before after bleaching, KHN tests conducted force 25 gf for 5 s. TC was performed CIE-L*a*b* system readouts obtained following 4 time points: treatment; first session, second third session. dehydrated coated gold, photomicrographs double-blind manner LEO microscope. Results: Using one-way analysis variance Tukey's test P Conclusions: Therefore, prevented changes reducing efficacy bleaching.