{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T10:50:25Z","timestamp":1791888625404,"version":"4.3.4"},"reference-count":39,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2017,10,6]],"date-time":"2017-10-06T00:00:00Z","timestamp":1507248000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"81 Medical Group","award":["FKE20140012N"],"award-info":[{"award-number":["FKE20140012N"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Prosthodontics"],"published-print":{"date-parts":[[2019,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To evaluate the effect of preparation ferrule inclusion with fracture resistance of mandibular molar endocrowns.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Recently extracted mandibular third molars were randomly divided into 3 groups (n = 12) with the coronal tooth structure removed perpendicular to the root long axis approximately 2 mm above the cemento\u2010enamel junction with a slow\u2010speed diamond saw. The pulp chamber was exposed using a diamond bur in a high\u2010speed handpiece with pulpal remnants removed and canals instrumented using endodontic hand instruments. The chamber floor was restored using a resin core material with a two\u2010step, self\u2010etch adhesive and photopolymerized with a visible light\u2010curing unit to create a 2 mm endocrown preparation pulp chamber extension. One and two millimeter ferrule height groups were prepared using a diamond bur in a high\u2010speed handpiece following CAD\/CAM guidelines. Completed preparation surface area was determined using a digital measuring microscope. Scanned preparations were restored with lithium disilicate restorations with a self\u2010adhesive resin luting agent. All manufacturer recommendations were followed. Specimens were stored at 37\u00b0C\/98% humidity and tested to failure after 24 hours at a 45\u00b0 angle to the tooth long axis using a universal testing machine. Failure load was converted to MPa using the available bonding surface area with mean data analyzed using Kruskal\u2010Wallis\/Dunn (<jats:italic>p<\/jats:italic> = 0.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Calculated failure stress found no difference in failure resistance among the three groups; however, failure load results identified that the endocrown preparations without ferrule had significantly lower fracture load resistance. Failure mode analysis identified that all preparations demonstrated a high number of catastrophic failures.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Under the conditions of this study, ferrule\u2010containing endocrown preparations demonstrated significantly greater failure loads than standard endocrown restorations; however, calculated failure stress based on available surface area for adhesive bonding found no difference between the groups. Lower instances of catastrophic failure were observed with the endocrown preparations containing 1 mm of preparation ferrule design; however, regardless of the presence of ferrule, this study found that all endocrown restorations suffered a high proportion of catastrophic failures but at loads greater than reported under normal masticatory function.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jopr.12671","type":"journal-article","created":{"date-parts":[[2017,10,6]],"date-time":"2017-10-06T16:36:38Z","timestamp":1507307798000},"source":"Crossref","is-referenced-by-count":75,"title":["Preparation Ferrule Design Effect on Endocrown Failure Resistance"],"prefix":"10.1111","volume":"28","author":[{"given":"Michael","family":"Einhorn","sequence":"first","affiliation":[{"name":"AEGD\u20101, 2nd Dental Squadron Barksdale Air Force Base  LA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicholas","family":"DuVall","sequence":"additional","affiliation":[{"name":"USAF Postgraduate 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