{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,20]],"date-time":"2026-09-20T16:00:36Z","timestamp":1789920036924,"version":"4.0.1"},"reference-count":41,"publisher":"Maad Rayan Publishing Company","issue":"2","content-domain":{"domain":["joddd.tbzmed.ac.ir"],"crossmark-restriction":false},"short-container-title":["J Dent Res Dent Clin Dent Prospects"],"published-print":{"date-parts":[[2026,6,30]]},"abstract":"<jats:p>Introduction: Patients who receive ceramic restorations use daily oral care products or plaque-control agents, which may cause discoloration of these restorations. The present study assessed the color stability of multi-layered zirconia and lithium disilicate pressable ceramic after 28 days of immersion in chlorhexidine, coffee, and soda. Methods: A disc measuring 2 mm in thickness and 10 mm in diameter was designed to fabricate 30 discs, divided into two groups based on the ceramic material: multi-layered (ML) zirconia and lithium disilicate (LD). Each group was further subdivided into three subgroups based on the staining solution: chlorhexidine, Cola, and coffee. The samples were immersed in staining liquids at room temperature for 28 days. Color was measured immediately at t0 and every week (t1 , t2 , t3 , and t4 ) using a spectrophotometer. Color changes were calculated. For pairwise comparisons, the Friedman test was first employed, followed by post hoc tests. Results: The greatest \u2206E was observed in LD specimens immersed in chlorhexidine (5.65), followed by LD specimens immersed in coffee (5.44). The lowest \u2206E was observed for ML zirconia specimens immersed in coffee (0.64). Significant differences were observed between \u2206E values of all tested groups and subgroups (P\u22640.05). Conclusion: ML zirconia exhibited significantly higher color stability than LD pressable ceramic after being subjected to simulated 28 months of beverage consumption and using chlorhexidine. Clinical Significance: Multi-layered zirconia exhibited higher resistance to discoloration than lithium disilicate pressable ceramic. Dental professionals should inform patients about the effects of chlorhexidine, Cola, and coffee on lithium disilicate pressable restorations.<\/jats:p>","DOI":"10.34172\/joddd.44008","type":"journal-article","created":{"date-parts":[[2026,9,20]],"date-time":"2026-09-20T15:06:12Z","timestamp":1789916772000},"page":"73-79","update-policy":"https:\/\/doi.org\/10.34172\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Color Stability of Multi-Layered Zirconia Versus Lithium Disilicate Glass Ceramic: An in Vitro Study"],"prefix":"10.34172","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-4248-830X","authenticated-orcid":true,"given":"Doaa Mohamed Farahat","family":"Aboul Azm","sequence":"first","affiliation":[{"name":"Department of Dental Biomaterials, Faculty of Dentistry, Pharos University in Alexandria, Alexandria, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roqaia 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