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MEDLINE, Embase, Scopus, and Web of Science were searched from database inception to January 2026, with grey literature sources also searched. The electronic database searches were updated in August 2026 using the original search strategies. Reference-list screening and forward citation tracking were undertaken alongside both the initial search and the updated search.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Five longitudinal studies met the eligibility criteria. IOS-based approaches consistently detected measurable surface change over time, including during relatively short follow-up intervals in which conventional clinical indices frequently demonstrated no categorical progression. Substantial heterogeneity existed in progression thresholds, outcome measures, superimposition methodologies, and reporting strategies. Agreement between IOS-derived measurements and conventional index scores was variable and generally weak to moderate. IOS quantifies continuous dimensional change, whereas clinical indices categorise severity using ordinal scales. No validated framework was identified linking quantified dimensional surface loss to clinically meaningful ETW progression.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Quantitative IOS measurements and conventional clinical indices assess different dimensions of tooth wear and cannot currently be interpreted as directly interchangeable measures of progression. Validated frameworks linking quantitative surface loss to biological and clinical relevance are required.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Clinical relevance<\/jats:title>\n                    <jats:p>IOS enables high-resolution longitudinal quantification of tooth surface change, but the clinical significance of detected change remains uncertain. Establishing clinically meaningful progression thresholds is essential for integrating quantitative digital monitoring into routine care.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00784-026-07217-8","type":"journal-article","created":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T12:48:47Z","timestamp":1791895727000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Defining progression in erosive tooth wear: an interpretive challenge"],"prefix":"10.1007","volume":"30","author":[{"given":"Bryan D.","family":"Murchie","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Lynch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew","family":"Carr","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Edwards","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,13]]},"reference":[{"key":"7217_CR1","doi-asserted-by":"publisher","first-page":"2","DOI":"10.1159\/000503308","volume":"54","author":"N Schlueter","year":"2019","unstructured":"Schlueter N, Amaechi BT, Bartlett D et al (2019) Terminology of Erosive Tooth Wear: Consensus Report of a Workshop Organized by the ORCA and the Cariology Research Group of the IADR. 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