{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,14]],"date-time":"2026-04-14T22:46:23Z","timestamp":1776206783596,"version":"3.50.1"},"reference-count":28,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2023,8,23]],"date-time":"2023-08-23T00:00:00Z","timestamp":1692748800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Portuguese Foundation for Science and Technology","award":["UID\/FIS\/04559\/2013"],"award-info":[{"award-number":["UID\/FIS\/04559\/2013"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biomimetics"],"abstract":"<jats:p>Colour assessment using digital methods can yield varying results, and it is important for clinicians to recognize the potential variability intra and inter-device. This study aimed to compare the L*a*b* values of VITA Classical (VC) and VITA Toothguide 3D-MASTER (VM) guides using two methods, SpectroShade (SS) and eLAB. Thirty-four measurements per tab were performed by a single operator across three batches of each guide. Intraclass correlation coefficients (ICC) between batches were calculated. Values &lt;0.5, 0.5\u20130.75, 0.75\u20130.9, and &gt;0.90 were classified as poor, moderate, good, and excellent reliability, respectively. Results were reported as mean and standard deviation of the L*a*b* values and respective colour differences (\u0394E00) for each tab and method. Statistical analyses were performed with an independent t-test, \u03b1 = 0.05. ICC values between batches were excellent for all L*a*b*, except for a* component in eLAB. There were statistically significant differences between methods in most L*a*b* values. The intra-device mean \u0394E00 was 0.5 \u00b1 0.6 for VC, 0.5 \u00b1 0.8 for VM in SS, 1.1 \u00b1 0.8 for VC, 1.1 \u00b1 0.9 for VM in eLAB. The mean \u0394E00 inter-device was 4.9 \u00b1 1.7 for VC, 5.0 \u00b1 1.7 for VM. Both methods demonstrated good internal consistency, with high ICC values and low intra-device colour differences, but exhibited high variability between methods, higher for a* the component.<\/jats:p>","DOI":"10.3390\/biomimetics8050384","type":"journal-article","created":{"date-parts":[[2023,8,23]],"date-time":"2023-08-23T10:29:29Z","timestamp":1692786569000},"page":"384","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Different Methods for Assessing Tooth Colour\u2014In Vitro Study"],"prefix":"10.3390","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5956-7234","authenticated-orcid":false,"given":"Susana","family":"Dias","sequence":"first","affiliation":[{"name":"Oral Biology and Biochemistry Research Group, Faculdade de Medicina Dent\u00e1ria, Universidade de Lisboa, 1950-044 Lisboa, Portugal"}]},{"given":"Joana","family":"Dias","sequence":"additional","affiliation":[{"name":"Oral Biology and Biochemistry Research Group, Faculdade de Medicina Dent\u00e1ria, Universidade de Lisboa, 1950-044 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5596-8479","authenticated-orcid":false,"given":"Ruben","family":"Pereira","sequence":"additional","affiliation":[{"name":"Oral Biology and Biochemistry Research Group, Faculdade de Medicina Dent\u00e1ria, Universidade de Lisboa, 1950-044 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9366-0662","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Silveira","sequence":"additional","affiliation":[{"name":"Oral Biology and Biochemistry Research Group, Faculdade de Medicina Dent\u00e1ria, Universidade de Lisboa, 1950-044 Lisboa, Portugal"},{"name":"LIBPhys-FCT UID\/FIS\/04559\/2013, Faculdade de Medicina Dent\u00e1ria, Universidade de Lisboa, 1950-044 Lisboa, Portugal"}]},{"given":"Ant\u00f3nio","family":"Mata","sequence":"additional","affiliation":[{"name":"Oral Biology and Biochemistry Research Group, Faculdade de Medicina Dent\u00e1ria, Universidade de Lisboa, 1950-044 Lisboa, Portugal"},{"name":"LIBPhys-FCT UID\/FIS\/04559\/2013, Faculdade de Medicina Dent\u00e1ria, Universidade de Lisboa, 1950-044 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1966-8281","authenticated-orcid":false,"given":"Duarte","family":"Marques","sequence":"additional","affiliation":[{"name":"Oral Biology and Biochemistry Research Group, Faculdade de Medicina Dent\u00e1ria, Universidade de Lisboa, 1950-044 Lisboa, Portugal"},{"name":"LIBPhys-FCT UID\/FIS\/04559\/2013, Faculdade de Medicina Dent\u00e1ria, Universidade de Lisboa, 1950-044 Lisboa, Portugal"},{"name":"Postgraduate Programme in Prosthodontics, Faculdade de Medicina Dent\u00e1ria, Universidade de Lisboa, 1950-044 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,8,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"103","DOI":"10.1111\/jerd.12465","article-title":"Acceptability and perceptibility thresholds in dentistry: A comprehensive review of clinical and research applications","volume":"31","author":"Paravina","year":"2019","journal-title":"J. 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