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This study aimed to assess the color stability and surface roughness of a smart monochromatic resin composite submerged in various staining solutions.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Materials and methods<\/jats:title>\n            <jats:p>Ninety-nine disc samples of composite resins (8\u00a0mm in diameter and 2\u00a0mm in thickness) were prepared and divided into three groups (<jats:italic>n<\/jats:italic>\u2009=\u200933): Group A, Omnichroma (Tokuyama Dental, Tokyo, Japan); Group B, Neo Spectra ST HV (Dentsply, Konstanz, Germany); and Group C, Filtek Z350XT (3MESPE) composite resins. The samples were assessed for color stability (M) via a Vita Easyshade spectrophotometer and surface roughness (Ra) with a profilometer before and after thermocycling for a total of 1000 cycles at 5\u00b0\/55\u00b0C with a 15-second dwell time. Each group was subdivided into three subgroups according to immersion solution (<jats:italic>n<\/jats:italic>\u2009=\u200911): Subgroup I was submerged in distilled water as a control, Subgroup II was submerged in tea, and Subgroup III was submerged in coffee. Color assessment was performed after immersion periods of T1: 7 days, T2: 15 days, and T3: 30 days with a Vita Easyshade spectrophotometer. A color change (\u2206E00) was obtained via the CIEDE2000 color difference formula. Surface roughness was assessed with a profilometer after 30 days of submersion in the staining solutions.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>Among all the samples in the study groups, Omnichroma had the lowest color change value for all the immersion solutions at different time intervals (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). The surface roughness of Omnichroma significantly differed after thermocycling (<jats:italic>P<\/jats:italic>\u2009=\u20090.075). However, Omnichroma had the least surface roughness compared with Neo Spectra ST HV (<jats:italic>P<\/jats:italic>\u2009=\u20090.026) and Filtek Z350XT (<jats:italic>P<\/jats:italic>\u2009=\u20090.024).<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>The color change and surface roughness of the supra-nanofilled (Omnichroma) resin-based composite were inferior to those of the nanohybrid (Neo Spectra) and nanofilled (Filtek Z350XT) composites.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/s12903-025-06555-5","type":"journal-article","created":{"date-parts":[[2025,7,19]],"date-time":"2025-07-19T12:43:57Z","timestamp":1752929037000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Evaluation of color stability and surface roughness of smart monochromatic resin composite in comparison to universal resin composites after immersion in staining solutions"],"prefix":"10.1186","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1303-6665","authenticated-orcid":false,"given":"Ammar Shawkat Abdul","family":"kareem","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wegdan Mohamed","family":"Abdel-Fattah","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marihan Ibrahim Lotfy","family":"El Gayar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,7,19]]},"reference":[{"key":"6555_CR1","doi-asserted-by":"publisher","unstructured":"Catelan A, Suzuki TYU, Becker F Jr., Briso ALF, Dos Santos PH. 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