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Resin composite restorative material was used to perform the initial restoration, followed by aging procedures using thermo-mechanical cycling fatigue to replicate six months of intraoral aging. The specimens were then randomly divided into two groups: a totally replaced restoration (TR) group (<jats:italic>n<\/jats:italic>\u2009=\u200915), which involved the preparation of a traditional endodontic access cavity after the complete removal of the pre-existing coronal filling; and a partially replaced restoration (PR) group (<jats:italic>n<\/jats:italic>\u2009=\u200915), which involved accessing the tooth through the pre-existing restoration without completely removing it. Root canal preparation and filling procedures were conducted, and the access cavity was sealed with a new resin composite restoration, followed by a new thermo-mechanical cycling aging procedure. Finally, the specimens were submitted to a static fracture test to measure specimen fracture strength and determine the failure mode pattern (repairable fracture or irreparable fracture). Chi-square and <jats:italic>t<\/jats:italic>-tests were used for statistical analysis.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Significant differences between the groups regarding their mechanical resistance were found. The average failure load of the TR group was 1115.13\u00a0N and 1330.23\u00a0N in the PR group (<jats:italic>p<\/jats:italic>\u2009=\u20090.002). Regarding the failure modes, the TR group exhibited eight irreparable fractures, while the PR group had four (<jats:italic>p<\/jats:italic>\u2009=\u20090.136).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Partially replaced restorations presented higher fracture strength and led to fewer irreparable fractures when compared to totally replaced restorations in root canal-treated teeth.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12903-024-05180-y","type":"journal-article","created":{"date-parts":[[2024,12,27]],"date-time":"2024-12-27T08:52:45Z","timestamp":1735289565000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Unveiling the mechanical performance of partially replaced coronal restorations in root canal-treated teeth: an in-vitro study"],"prefix":"10.1186","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4250-9951","authenticated-orcid":false,"given":"Mohammed","family":"Turky","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gianluca","family":"Plotino","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nermin Alsayed","family":"Mahmoud","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,12,27]]},"reference":[{"key":"5180_CR1","doi-asserted-by":"publisher","first-page":"1059","DOI":"10.1111\/iej.13796","volume":"55","author":"F Mannocci","year":"2022","unstructured":"Mannocci F, Bitter K, Sauro S, Ferrari P, Austin R, Bhuva B. 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The approval was received from the Research Ethics Committee of the University at the Faculty of Dentistry, Minia University, Egypt (Committee No. 103, registration No. 893, date: 30\/1\/2024). All methods were performed per the relevant guidelines and regulations. Written informed consent was obtained from all the participants in the present study.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}},{"value":"Not applicable. Conducting the current experiment was limited to obtaining approval from the local Research Ethics Committee at the Faculty of Dentistry, Minia University, Egypt (Committee No. 103, registration No. 893, date: 30\/1\/2024).","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Clinical trial number"}}],"article-number":"1562"}}