{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,13]],"date-time":"2026-02-13T20:20:36Z","timestamp":1771014036578,"version":"3.50.1"},"reference-count":37,"publisher":"Operative Dentistry","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2012,4,1]]},"abstract":"<jats:title>SUMMARY<\/jats:title>\n               <jats:sec>\n                  <jats:title>Purpose<\/jats:title>\n                  <jats:p>The aim of this in vitro study was to determine the color changes of five different restorative materials after exposing these materials to two different home bleaching agents.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>This study applied bleaching agents to an ultralow-fusing porcelain, a low-fusing porcelain, two types of heat-pressed glass ceramics, and a ceromer. A total of 24 disc-shaped specimens were fabricated (with a diameter of 10 mm and a thickness of 2 mm) from each material (n=12). The initial color measurements were taken with a spectrophotometer. The first set of specimens were bleached with 10% hydrogen peroxide (HP) for one hour daily for 10 days. The other set of specimens were bleached with 10% carbamide peroxide (CP) bleaching gel for eight hours daily for 14 days. Data were analyzed with the one-way analysis of variance and Kruskal-Wallis statistical test. The difference in the prebleaching and postbleaching color of each material was considered to be statistically significant at p &amp;lt; 0.05.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>The study found a statistically significant difference among the color changes of the test groups after exposing them to both bleaching agents (p&amp;lt;0.05). Appreciable color change was observed in the Estenia (\u0394E=3.99) specimens that were bleached with the HP, and noticeable color changes were observed in the Estenia (\u0394E=1.89) and IPS Empress 2 (\u0394E=1.66) groups when they were treated with the CP.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>Restorations (especially polymer-containing restorative materials) should be protected before any bleaching procedure due to the high risk of color change.<\/jats:p>\n               <\/jats:sec>","DOI":"10.2341\/11-436-l","type":"journal-article","created":{"date-parts":[[2012,7,13]],"date-time":"2012-07-13T04:40:21Z","timestamp":1342154421000},"page":"E1-E8","source":"Crossref","is-referenced-by-count":31,"title":["The Effect of Bleaching Agents on the Color Stability of Ceromer and Porcelain Restorative Materials In 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