{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T15:27:01Z","timestamp":1791214021658,"version":"4.1.0"},"reference-count":30,"publisher":"Oxford University Press (OUP)","issue":"5","license":[{"start":{"date-parts":[[2024,9,30]],"date-time":"2024-09-30T00:00:00Z","timestamp":1727654400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,10,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>Objective<\/jats:title>\n                  <jats:p>The objective was to compare the colourimetric increment (L*, a*, and b*) of three types of aligners after subjecting them to two stains and to evaluate the initial colourimetric characteristics.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>A total of 120 aligners (40 Invisalign\u00ae, 40 Spark\u00ae, and 40 QuickSmile\u00ae) were immersed in two different agents (distilled water and coffee). Measurements were taken using a spectrophotometer before immersion (T0), after 12 hours (T1), and after 7 days (T2). Colour changes (\u0394E*) were evaluated based on the International Commission of L\u2019Eclairage, and subsequently converted to National Bureau of Standards units. The measurement was repeated three times. The intraclass correlation coefficient, one-way ANOVA, Tukey\u2019s post hoc test, and the independent t test were used (P\u2005\u2264\u2005.05).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>At T0, significant differences were observed for a*: Invisalign\u00ae and Spark\u00ae tended towards redder tones, whereas Quicksmile\u00ae leaned towards greener shades. Regarding b*, all aligners tended towards yellow, with Invisalign\u00ae exhibiting the least tendency. No differences were found in water between T1 and T0. In the intervals, T2-T1 and T2-T0, Spark\u00ae showed more noticeable changes, whereas for Invisalign\u00ae and Quicksmile\u00ae, the change was only slight. In coffee, a shift to another colour was detected in T1-T0, T2-T1, and T2-T0 for Invisalign\u00ae, whereas for other brands, it was barely noticeable except for T2-T0 in Spark\u00ae, where the change was appreciable. In coffee, Invisalign\u00ae tended towards darker values (L*), turning redder (a*), and more yellow (b*) in T2-T1 and T2-T0.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>Invisalign\u00ae aligners initially presented a more reddish and less yellowish colour. In water, after 7 days, a noticeable colour change was found for Spark\u00ae. In coffee, a greater loss in brightness and a change to red and yellow were observed after 12 hours and 7 days for Invisalign\u00ae. This study highlights the importance of considering the impact of coffee on the colouring of aligners, especially with Invisalign\u00ae, which shows more noticeable changes.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/ejo\/cjae047","type":"journal-article","created":{"date-parts":[[2024,9,30]],"date-time":"2024-09-30T15:32:52Z","timestamp":1727710372000},"source":"Crossref","is-referenced-by-count":2,"title":["Colourimetric changes experienced in three types of aligners according to the L\u2019Eclairage Commission"],"prefix":"10.1093","volume":"46","author":[{"given":"Teresa","family":"Domingo-Jim\u00e9nez","sequence":"first","affiliation":[{"name":"Department of Orthodontics, University Rey Juan Carlos , Alcorc\u00f3n, CP 28922, Madrid ,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3221-6848","authenticated-orcid":false,"given":"Mar\u00eda Jos\u00e9","family":"Gonz\u00e1lez-Olmo","sequence":"additional","affiliation":[{"name":"Department of Orthodontics, University Rey Juan Carlos , Alcorc\u00f3n, CP 28922, Madrid ,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolina","family":"Nieto-Moraleda","sequence":"additional","affiliation":[{"name":"Department of Orthodontics, University Rey Juan Carlos , Alcorc\u00f3n, CP 28922, Madrid ,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda","family":"P\u00e9rez-Chicharro","sequence":"additional","affiliation":[{"name":"Department of Orthodontics, University Rey Juan Carlos , Alcorc\u00f3n, CP 28922, Madrid ,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Romero-Maroto","sequence":"additional","affiliation":[{"name":"Department of Orthodontics, University Rey Juan Carlos , Alcorc\u00f3n, CP 28922, Madrid 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