{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,24]],"date-time":"2026-10-24T16:12:43Z","timestamp":1792858363614,"version":"4.5.0"},"reference-count":42,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2024,9,11]],"date-time":"2024-09-11T00:00:00Z","timestamp":1726012800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2024,9,11]],"date-time":"2024-09-11T00:00:00Z","timestamp":1726012800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100009827","name":"Alexandria University","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100009827","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["BMC Oral Health"],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Recently, prosthodontic approaches involve more conservative procedures that include less invasive finish line preparations that use less ceramic thickness.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Aim of the study<\/jats:title>\n                    <jats:p>This in vitro study aimed to evaluate the effect of vertical preparation and modified vertical preparation designs on the marginal adaptation and fracture resistance of two types of ceramic crowns using CAD\/CAM technology.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and methods<\/jats:title>\n                    <jats:p>\n                      Two typodont maxillary first premolars were embedded in acrylic resin. Forty positive replicas of epoxy resin dies were used that were divided into two groups depending on the preparation design (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200920); Group V (Vertical): dies with feather edge finish line and Group MV (Modified vertical): dies with feather edge finish line, where a reverse shoulder of 1\u00a0mm depth was placed on the buccal surface 1.5\u00a0mm from the occlusal surface. Each group was further subdivided into two subgroups according to the type of ceramic material (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200910): Subgroup Va and subgroup MVa for lithium disilicate (e.max CAD) and subgroup Vb and subgroup MVb for zirconia (zolid ht+). Crown restorations were made with CAD-CAM technology. The marginal adaptation was assessed using a stereomicroscope both prior to cementation and after cementation and aging. Fracture resistance was tested with a universal testing machine, and the data were statistically analyzed.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Marginal adaptation showed no significant differences between subgroups before or after cementation and aging. Three-way ANOVA indicated that preparation design (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.516) and material (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.269) had no significant effect, but cementation had a significant effect (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.0001) on the marginal adaptation. According to two-way ANOVA test, Subgroup (MVb) showed the highest result followed by subgroup (Vb) and subgroub (MVa) and the least was subgroub (Va). Fracture modes showed no significant differences among the subgroups (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.982).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Marginal adaptation of lithium disilicate and zirconia crowns remained clinically acceptable regardless of preparation design. While the modified vertical preparation with a reverse shoulder notably enhanced the fracture resistance of both materials, with zirconia demonstrating superior fracture resistance compared to lithium disilicate with average values exceeding premolar biting force.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12903-024-04742-4","type":"journal-article","created":{"date-parts":[[2024,9,11]],"date-time":"2024-09-11T09:03:16Z","timestamp":1726045396000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["The effect of two preparation designs on the fracture resistance and marginal adaptation of two types of ceramic crowns using CAD\/CAM technology (In vitro study)"],"prefix":"10.1186","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-8000-4164","authenticated-orcid":false,"given":"Akram Moamen","family":"Ashour","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohamed Mahmoud","family":"El-Kateb","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amir Shoukry","family":"Azer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,9,11]]},"reference":[{"key":"4742_CR1","doi-asserted-by":"publisher","first-page":"110","DOI":"10.1007\/s13191-014-0378-7","volume":"14","author":"S Tripathi","year":"2014","unstructured":"Tripathi S, Amarnath GS, Muddugangadhar BC, Sharma A, Choudhary S. 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All methods were performed in accordance with the Declaration of Helsinki and the ethical guidelines adopted by the Research Ethics Committee of the Faculty of Dentistry, Alexandria University. No human participants were involved in the study. The need for informed consent was waived by the Ethics committee of the Faculty of Dentistry, Alexandria University.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"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"}}],"article-number":"1065"}}