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A standardized adhesive protocol was used, followed by GFRC application and dual-cure core buildup. Fracture strength was tested under a 45\u00b0 compressive load. Failure modes were categorized as favorable (type I, II, III) or unfavorable (type IV). Data were analyzed using ANOVA with Tukey\u2019s post hoc test, independent t-tests, and chi-square tests (\u03b1\u2009=\u20090.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      GFRC type significantly affected fracture strength (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001), whereas neither simulated canal morphology nor PSD showed a significant effect. At 4\u00a0mm PSD, everX-flow exhibited significantly lower fracture strength than Itena and everStick posts in single-circle and oval canal models (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05). At 6\u00a0mm PSD, everX-flow recorded the lowest fracture strength in single-circle canal models (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05). Failure mode was significantly influenced by PSD (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.01) and GFRC type (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001). A 6\u00a0mm PSD was associated with a higher percentage of each favorable failure type compared to 4\u00a0mm PSD. EverStick and Itena posts showed the highest percentage of favorable failures.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The intra-canal reinforcing material is the primary determinant of the fracture performance of post-core buildups. The mechanical reinforcement materials of everStick and everX-posterior posts but not everX-flow are comparable to that of Itena post.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Clinical relevance<\/jats:title>\n                    <jats:p>Everstick and everX-posterior can replace Itena posts as safe reinforcing materials in single-canaled premolars.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12903-025-07424-x","type":"journal-article","created":{"date-parts":[[2025,12,17]],"date-time":"2025-12-17T07:35:41Z","timestamp":1765956941000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Effect of simulated root canal morphology and post space depth on fracture performance of glass fiber-reinforced post-core buildups"],"prefix":"10.1186","volume":"26","author":[{"given":"Salma Magdy","family":"Wahby","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Khaled Aly","family":"Nour","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Omaima Hassan","family":"Ghallab","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Khaled Mohamed","family":"Adel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,12,17]]},"reference":[{"issue":"2","key":"7424_CR1","doi-asserted-by":"publisher","first-page":"804","DOI":"10.1111\/iej.13737","volume":"55","author":"S Patel","year":"2022","unstructured":"Patel S, Bhuva B, Bose R. 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