{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T01:11:38Z","timestamp":1787015498618,"version":"build-2736575974"},"reference-count":23,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2021,10,19]],"date-time":"2021-10-19T00:00:00Z","timestamp":1634601600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Esthet Restor Dent"],"published-print":{"date-parts":[[2022,4]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>To compare the fracture load of zirconia and lithium disilicate crowns prepared with endodontic access with fine and coarse diamond instruments.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and methods<\/jats:title>\n                    <jats:p>0.8\u2009mm (3Y zirconia) or 1\u2009mm (lithium disilicate) crowns were luted to resin composite dies with resin\u2010modified glass ionomer (zirconia) or self\u2010adhesive resin (lithium disilicate) cement. A 2.5\u2009mm endodontic access hole was placed in each crown with fine (8369DF.31.025FOOTBALL) or coarse (6379\u2009DC.31.023FOOTBALL) diamond instruments and restored with composite. A control group was prepared without access holes. Crowns were thermocycled for 10,000\u2009cycles (5\u201355\u00b0C) and tested in compression with a steel indenter until failure (n\u00a0=\u00a08\/group). A one\u2010way ANOVA and Dunnett 2\u2010sided test (alpha\u00a0=\u00a00.05) compared differences in fracture load between groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>For zirconia, there was no statistical difference between the control group (2335\u2009\u00b1\u2009160\u2009N) and coarse diamond group (2345\u2009\u00b1\u2009246\u2009N); however, the fine diamond group (2077\u2009\u00b1\u2009216\u2009N) was significantly lower. For lithium disilicate, there was no statistical difference between the control group (2113\u2009\u00b1\u2009183\u2009N) and the fine (2049\u2009\u00b1\u2009105\u2009N) or coarse (2240\u2009\u00b1\u2009118\u2009N) groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>3Y zirconia crowns became weaker when accessed with a fine diamond instrument. There was no negative effect of the endodontic access with bonded lithium disilicate crowns.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Clinical significance<\/jats:title>\n                    <jats:p>Conservative endodontic access openings in high\u2010strength ceramic restorations do not have a negative effect on their static fracture load. The coarse zirconia\u2010cutting diamond rotary instrument is more efficient and has a less detrimental effect on the strength of the crowns than a fine diamond rotary instrument.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jerd.12829","type":"journal-article","created":{"date-parts":[[2021,10,20]],"date-time":"2021-10-20T18:00:03Z","timestamp":1634752803000},"page":"534-540","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Fracture strength of zirconia and lithium disilicate restorations following endodontic access"],"prefix":"10.1111","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2221-3918","authenticated-orcid":false,"given":"Thomas J.","family":"Lucas","sequence":"first","affiliation":[{"name":"Division of Endodontics University of Alabama at Birmingham  Birmingham Alabama USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9684-2015","authenticated-orcid":false,"given":"Nathaniel C.","family":"Lawson","sequence":"additional","affiliation":[{"name":"Division of Biomaterials University of Alabama at Birmingham  Birmingham Alabama USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brandon","family":"Englert","sequence":"additional","affiliation":[{"name":"Division of Biomaterials University of Alabama at Birmingham  Birmingham Alabama USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ken","family":"Goldstein","sequence":"additional","affiliation":[{"name":"Department of Oral Rehabilitation Augusta University Dental College of Georgia  Augusta Georgia USA"},{"name":"Private practice  Atlanta Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ronald","family":"Goldstein","sequence":"additional","affiliation":[{"name":"Private practice  Atlanta 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