{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T10:50:50Z","timestamp":1791888650828,"version":"4.3.4"},"reference-count":44,"publisher":"Operative Dentistry","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2015,3,1]]},"abstract":"<jats:title>SUMMARY<\/jats:title>\n               <jats:p>This study assessed marginal leakage and fracture resistance of computer-aided design\/computer-aided manufacturing (CAD\/CAM) fabricated ceramic crowns with intracoronal extensions into the pulp chambers of endodontically treated teeth (endocrowns) using either feldspathic porcelain (CEREC Blocks [CB], Sirona Dental Systems GmbH, Bensheim, Germany), lithium disilicate (e.max [EX], Ivoclar Vivadent, Schaan, Liechtenstein), or resin nanoceramic (Lava Ultimate [LU], 3M ESPE, St Paul, MN, USA).). Thirty extracted human permanent maxillary molars were endodontically treated. Standardized preparations were done with 2-mm intracoronal extensions of the endocrowns into the pulp chamber. Teeth were divided into three groups (n=10); each group was restored with standardized CAD\/CAM fabricated endocrowns using one of the three tested materials. After cementation with resin cement, specimens were stored in distilled water at 37\u00b0C for one week, subjected to thermocycling, and immersed in a 5% methylene-blue dye solution for 24 hours. A compressive load was applied at 35 degrees to long axis of the teeth using a universal testing machine until failure. Failure load was recorded, and specimens were examined under a stereomicroscope for modes of failure and microleakage. Results were analyzed using one-way analysis of variance and Bonferroni post hoc multiple comparison tests (\u03b1=0.05). LU showed significantly (p&amp;lt;0.05) higher fracture resistance and more favorable fracture mode (ie, fracture of the endocrown without fracture of tooth) as well as higher dye penetration than CB and EX. In conclusion, although using resin nanoceramic blocks for fabrication of endocrowns may result in better fracture resistance and a more favorable fracture mode than other investigated ceramic blocks, more microleakage may be expected with this material.<\/jats:p>","DOI":"10.2341\/13-143-l","type":"journal-article","created":{"date-parts":[[2014,9,30]],"date-time":"2014-09-30T16:01:02Z","timestamp":1412092862000},"page":"201-210","source":"Crossref","is-referenced-by-count":138,"title":["Fracture Resistance and Microleakage of Endocrowns Utilizing Three CAD-CAM Blocks"],"prefix":"10.2341","volume":"40","author":[{"given":"HM","family":"El-Damanhoury","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"RN","family":"Haj-Ali","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"JA","family":"Platt","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1188","reference":[{"issue":"2","key":"2020060414541818400_i1559-2863-40-2-201-b01","first-page":"247","article-title":"Restoration of endodontically treated teeth: Review, classification, and post design","volume":"10","author":"Chalifoux","year":"1998","journal-title":"Practical Periodontics and Aesthetic Dentistry"},{"key":"2020060414541818400_i1559-2863-40-2-201-b02","doi-asserted-by":"crossref","first-page":"150251","DOI":"10.1155\/2009\/150251","article-title":"Restoration of endodontically treated teeth review and treatment recommendations","volume":"2009","author":"Slutzky-Goldberg","year":"2009","journal-title":"International Journal of Dentistry"},{"issue":"5","key":"2020060414541818400_i1559-2863-40-2-201-b03","doi-asserted-by":"crossref","first-page":"611","DOI":"10.14219\/jada.archive.2005.0232","article-title":"A review of the management of endodontically treated teeth: Post, core and the final restoration","volume":"136","author":"Cheung","year":"2005","journal-title":"Journal of the American Dental Association"},{"issue":"5","key":"2020060414541818400_i1559-2863-40-2-201-b04","doi-asserted-by":"crossref","first-page":"289","DOI":"10.1097\/00004770-200405000-00001","article-title":"Post placement and restoration of endodontically treated teeth: A literature review","volume":"30","author":"Schwartz","year":"2004","journal-title":"Journal of Endodontics"},{"issue":"4","key":"2020060414541818400_i1559-2863-40-2-201-b05","doi-asserted-by":"crossref","first-page":"380","DOI":"10.1067\/mpr.2002.123848","article-title":"The restoration of endodontically treated, single-rooted teeth with cast or direct posts and cores: A systematic review","volume":"87","author":"Heydecke","year":"2002","journal-title":"Journal of Prosthetic Dentistry"},{"issue":"2","key":"2020060414541818400_i1559-2863-40-2-201-b06","doi-asserted-by":"crossref","first-page":"135","DOI":"10.1590\/S0103-64402012000200008","article-title":"Longitudinal clinical evaluation of post systems: A literature review","volume":"23","author":"Soares","year":"2012","journal-title":"Brazilian Dental Journal"},{"issue":"4","key":"2020060414541818400_i1559-2863-40-2-201-b07","doi-asserted-by":"crossref","first-page":"276","DOI":"10.1016\/j.jdent.2012.01.002","article-title":"The effect of ferrule on the fracture mode of endodontically treated canines restored with fibre posts and metal-ceramic or all-ceramic crowns","volume":"40","author":"Fragou","year":"2012","journal-title":"Journal of Dentistry"},{"issue":"2","key":"2020060414541818400_i1559-2863-40-2-201-b08","first-page":"117","article-title":"Biomechanical considerations for the restoration of endodontically treated teeth: A systematic review of the literature, part II. 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