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Human maxillary lateral incisors of similar size were decoronated, assigned to five groups (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200918, power\u2009=\u20090.9) and embedded in acrylic blocks with artificial periodontal ligament. After root canal filling, post spaces were prepared to place coated fiber-reinforced composite (FRC) or sandblasted titanium (Ti) posts of the same shape and size. Half of the posts were zinc phosphate cemented (C), while the other half was adhesively luted (A). Untreated teeth served as control. After thermal cycling and staircase loading in a chewing simulator, the crack formation on the root dentin surface was microscopically examined and classified as no defect, craze line, vertical crack, and horizontal crack. Subsequently, the samples were loaded until root fracture. Data were analyzed by one-way ANOVA, Tukey\u2019s test, and Fisher\u2019s exact test. All samples survived the chewing simulation without VRF, but crack formation was significantly different between the groups (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009=\u20090.009). The control showed significantly fewer defects than FRC\/C, Ti\/C, and Ti\/A (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009=\u20090.001,\n                    <jats:italic>P<\/jats:italic>\n                    \u2009=\u20090.008,\n                    <jats:italic>P<\/jats:italic>\n                    \u2009=\u20090.008, respectively). FRC\/C showed the highest incidence of vertical cracks. FRC\/A had the lowest incidence of defects. There was no significant difference in VRF resistance between the groups (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009=\u20090.265). Adhesively luted FRC posts did not increase VRF resistance but reduced the risk of defects. Most defects were craze lines and vertical root cracks.\n                  <\/jats:p>","DOI":"10.1007\/s10266-022-00709-5","type":"journal-article","created":{"date-parts":[[2022,5,6]],"date-time":"2022-05-06T16:05:00Z","timestamp":1651853100000},"page":"719-725","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Vertical root fracture resistance and crack formation of root canal-treated teeth restored with different post-luting systems"],"prefix":"10.1007","volume":"110","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1012-1191","authenticated-orcid":false,"given":"Andreas","family":"Rathke","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henry","family":"Frehse","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beatrice","family":"Hrusa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,5,6]]},"reference":[{"key":"709_CR1","doi-asserted-by":"publisher","unstructured":"Patel S, Bhuva B, Bose R. 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BH declares that she has no conflict of interest. AR is an employee of Dentsply Sirona in Konstanz.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"This article does not contain any studies with human participants or animals performed by any of the authors.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}}]}}