{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T00:49:06Z","timestamp":1790815746006,"version":"4.1.0"},"reference-count":38,"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":[[2024,6,24]]},"abstract":"<jats:p>Background. This study assessed the effect of repeated preheating of three types of composite resins and a giomer on their color stability. Methods. In this in vitro study, 128 composite resin and giomer specimens with a 10-mm diameter and a 2-mm height were evaluated in eight groups (n=16) of Heliomolar microfilled, Brilliant Enamel microhybrid, and Tetric N-Ceram nanohybrid composite resins, and Beautifil II giomer used at room temperature and also after preheating of the tube in a water bath at 55\u201260 \u00b0C for 40 times. After preparing the specimens, their color parameters were measured by a spectrophotometer. The specimens were immersed in a tea solution for 3 hours\/day for 40 days and underwent spectrophotometric color assessment again. The color change (\u2206E) was calculated and analyzed by two-way ANOVA (\u03b1=0.05). Results. The effects of composite resin type (P&lt;0.001) and preheating (P&lt;0.001) and their interaction effect (P&lt;0.001) were significant on \u2206E. Immersion in a tea solution caused a significantly greater color change in giomer (P&lt;0.05). The \u2206E of the microfilled composite resin was significantly higher than that of nanohybrid (P=0.003) and microhybrid composite resin (P=0.004). Conclusion. Repeated preheating of giomer, microhybrid, and nanohybrid composite resin specimens to 55\u201260 \u00b0C for 40 times adversely affected their color stability in the tea solution. The color change was significantly greater for giomer.<\/jats:p>","DOI":"10.34172\/joddd.41167","type":"journal-article","created":{"date-parts":[[2024,9,14]],"date-time":"2024-09-14T07:24:45Z","timestamp":1726298685000},"page":"110-114","update-policy":"https:\/\/doi.org\/10.34172\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Effect of repeated preheating on color stability of three types of composite resins and a giomer: An in vitro study"],"prefix":"10.34172","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1549-2488","authenticated-orcid":true,"given":"Mehdi","family":"Daneshpooy","sequence":"first","affiliation":[{"name":"Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, 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