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The restorations were evaluated for immediate quality, porosity and number of pores using stereomicroscope and micro-computed tomography. Statistical analysis included the Shapiro\u2012Wilk test for normality, one-way ANOVA with Holm\u2012Sidak post hoc test for normal data, Kruskal\u2012Wallis ANOVA and Dunn\u2019s test for non-normal data, and Fisher\u2019s exact test for restoration quality comparisons. Statistical significance level was set at <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>The proportion of restorations with acceptable immediate quality was higher for the restorations that had been contoured using a diamond-coated non-stick contouring instrument compared to the restorations that had been contoured using a conventional steel instrument (<jats:italic>p<\/jats:italic>\u2009=\u20090.033). The number of pores and porosity were similar for restorations that had been contoured with different contouring instruments. However, the number of pores and porosity were lowest in the restorations made of Filtek Supreme XTE followed by Admira Fusion and Fuji II LC.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>The use of diamond-like carbon-coated contouring instruments increased the proportion of acceptable composite restorations compared to conventional steel instruments.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Clinical relevance<\/jats:title>\n            <jats:p>Non-stick contouring instruments should be considered for wider use.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1007\/s00784-025-06342-0","type":"journal-article","created":{"date-parts":[[2025,4,22]],"date-time":"2025-04-22T01:49:53Z","timestamp":1745286593000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The effect of contouring instruments on immediate quality and porosity of direct restorations"],"prefix":"10.1007","volume":"29","author":[{"given":"Carlos","family":"Soler-Tornero","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pekka","family":"Toivonen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jaakko","family":"Suorsa","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sakari S.","family":"Karhula","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Simo","family":"Saarakkala","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vuokko","family":"Anttonen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jukka","family":"Leinonen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,4,22]]},"reference":[{"key":"6342_CR1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/j.jdent.2018.03.001","volume":"72","author":"D Eltahlah","year":"2018","unstructured":"Eltahlah D, Lynch CD, Chadwick BL, Blum IR, Wilson NHF (2018) An update on the reasons for placement and replacement of direct restorations. 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