PMC:2854328 / 13470-14927 JSONTXT

{"project":"MyTest","denotations":[{"id":"20396441-19192840-28965131","span":{"begin":98,"end":101},"obj":"19192840"},{"id":"20396441-18309619-28965132","span":{"begin":614,"end":617},"obj":"18309619"},{"id":"20396441-1403859-28965133","span":{"begin":773,"end":776},"obj":"1403859"},{"id":"20396441-15053912-28965134","span":{"begin":1235,"end":1237},"obj":"15053912"},{"id":"20396441-17695603-28965135","span":{"begin":1238,"end":1241},"obj":"17695603"}],"namespaces":[{"prefix":"_base","uri":"https://www.uniprot.org/uniprot/testbase"},{"prefix":"UniProtKB","uri":"https://www.uniprot.org/uniprot/"},{"prefix":"uniprot","uri":"https://www.uniprot.org/uniprotkb/"}],"text":"The results of the present study are in agreement with the findings of a recently published study.23 More specifically, they revealed that none of the bleaching systems notably changed the color of any of the composites tested after the initial bleaching session (ΔE\u003c2). Also, no significant difference was found between the two composites. This confirms that freshly prepared composites are color-stable. Similar results were found by Hubbezoglu et al, who reported that color change in both microfill and microhybrid resins after bleaching with 35% hydrogen peroxide for a total of 30 minutes did not exceed 3.3.15 In contrast, Monaghan et al found that in-office bleaching significantly affected the color of different composites; they reported ΔE values greater than 3.14 However, their bleaching protocol consisted of a pre-etching procedure using phosphoric acid, followed by four cycles (30 minutes each) of bleaching using 30% hydrogen peroxide along with infrared light activation. The procedure they used is much more aggressive than those followed in the current study, which may explain the discrepancy between the findings. Much greater ΔE values (\u003e6) were reported by other studies that used in-office bleaching on teeth.24,25 Comparing the current results to those obtained in these studies, it is concluded that composites do not bleach to the same degree as teeth. Therefore, replacement of such restorations may be a more effective option."}

{"project":"2_test","denotations":[{"id":"20396441-19192840-28965131","span":{"begin":98,"end":100},"obj":"19192840"},{"id":"20396441-18309619-28965132","span":{"begin":614,"end":616},"obj":"18309619"},{"id":"20396441-1403859-28965133","span":{"begin":773,"end":775},"obj":"1403859"},{"id":"20396441-15053912-28965134","span":{"begin":1235,"end":1237},"obj":"15053912"},{"id":"20396441-17695603-28965135","span":{"begin":1238,"end":1240},"obj":"17695603"}],"text":"The results of the present study are in agreement with the findings of a recently published study.23 More specifically, they revealed that none of the bleaching systems notably changed the color of any of the composites tested after the initial bleaching session (ΔE\u003c2). Also, no significant difference was found between the two composites. This confirms that freshly prepared composites are color-stable. Similar results were found by Hubbezoglu et al, who reported that color change in both microfill and microhybrid resins after bleaching with 35% hydrogen peroxide for a total of 30 minutes did not exceed 3.3.15 In contrast, Monaghan et al found that in-office bleaching significantly affected the color of different composites; they reported ΔE values greater than 3.14 However, their bleaching protocol consisted of a pre-etching procedure using phosphoric acid, followed by four cycles (30 minutes each) of bleaching using 30% hydrogen peroxide along with infrared light activation. The procedure they used is much more aggressive than those followed in the current study, which may explain the discrepancy between the findings. Much greater ΔE values (\u003e6) were reported by other studies that used in-office bleaching on teeth.24,25 Comparing the current results to those obtained in these studies, it is concluded that composites do not bleach to the same degree as teeth. Therefore, replacement of such restorations may be a more effective option."}