{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T20:56:41Z","timestamp":1792789001687,"version":"4.5.0"},"reference-count":23,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2012,1,14]],"date-time":"2012-01-14T00:00:00Z","timestamp":1326499200000},"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":["Int Endodontic J"],"published-print":{"date-parts":[[2012,6]]},"abstract":"<jats:sec><jats:label\/><jats:p><jats:bold>Xie KX, Wang XY, Gao XJ, Yuan CY, Li JX, Chu CH.<\/jats:bold> Fracture resistance of root filled premolar teeth restored with direct composite resin with or without cusp coverage. <jats:italic>International Endodontic Journal<\/jats:italic>, <jats:bold>45<\/jats:bold>, 524\u2013529, 2012.<\/jats:p><\/jats:sec><jats:sec><jats:title>Abstract<\/jats:title><jats:p><jats:bold>Aim\u2002<\/jats:bold> To evaluate the fracture resistance and fracture patterns of root filled maxillary first premolar teeth (with mesio\u2013occlusal cavity preparation) restored with several composite restoration designs.<\/jats:p><jats:p><jats:bold>Methodology\u2002<\/jats:bold> One hundred extracted sound human maxillary first premolars were randomly divided into five groups. Group 1 remained untreated (negative control). Conventional root canal treatment with additional mesial\u2013occlusal cavity preparation was carried out on teeth in groups 2\u20135. In group 2, the teeth were restored intra\u2010coronally with direct composite resin (positive control). In group 3, the palatal cusps of the teeth were reduced, and the cavities were restored with composite resin covering the palatal cusp (partial coverage). In group 4, the buccal and palatal cusps along with the distal marginal ridges were reduced; the cavities and cusps were restored with composite resin (conventional full coverage). In group 5, the buccal and palatal cusps were reduced but the distal marginal ridges were conserved. The cavities and the cusps were restored with composite resin (modified full coverage). All teeth were subjected to a progressive compressive loading parallel to their longitudinal axis until fracture. Fracture resistance was analysed using the one\u2010way ANOVA and Fisher\u2019s LSD test. Fracture patterns were analyzed with chi\u2010square test. The significance level was set at 0.05.<\/jats:p><jats:p><jats:bold>Results\u2002<\/jats:bold> The fracture resistance (mean\u2003\u00b1\u2003SD) of groups 1\u20135 was 1131\u2003\u00b1\u2003207<jats:italic>N<\/jats:italic>, 904\u2003\u00b1\u2003184<jats:italic>N<\/jats:italic>, 927\u2003\u00b1 224<jats:italic>N<\/jats:italic>, 1095\u2003\u00b1\u2003289<jats:italic>N<\/jats:italic> and 1085\u2003\u00b1\u2003243<jats:italic>N<\/jats:italic>, respectively (groups 1, 4, 5\u2003&gt;\u2003groups 2, 3; <jats:italic>P\u2003<\/jats:italic>=<jats:italic>\u2003<\/jats:italic>0.004). Cusp fractures were recorded as the fracture pattern in 20 (100%), 19 (95%), 16 (80%), 8 (40%) and 12 (60%) premolars in groups 1\u20135, respectively (groups 1, 2\u2003&gt;\u2003groups 4, 5; group 3\u2003&gt;\u2003group 4; <jats:italic>P\u2003<\/jats:italic>&lt;<jats:italic>\u2003<\/jats:italic>0.001).<\/jats:p><jats:p><jats:bold>Conclusions\u2002<\/jats:bold> When direct composite resin was used to restore root filled maxillary first premolar teeth involving a proximal surface, those restored with full\u2010coverage designs had greater fracture resistance.<\/jats:p><\/jats:sec>","DOI":"10.1111\/j.1365-2591.2011.02005.x","type":"journal-article","created":{"date-parts":[[2012,1,14]],"date-time":"2012-01-14T08:24:11Z","timestamp":1326529451000},"page":"524-529","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["Fracture resistance of root filled premolar teeth restored with direct composite resin with or without cusp coverage"],"prefix":"10.1111","volume":"45","author":[{"given":"K. 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Endodontics: Colleagues for Excellence Newsletter 2008 Summer. Chicago IL USA:American Association of Endodontics 1\u20138."},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2591.2004.00929.x"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dental.2010.09.008"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1708-8240.2008.00198.x"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.2341\/08-035-L"},{"key":"e_1_2_7_7_1","first-page":"829","article-title":"Influence of resin composite insertion technique in preparations with a high C\u2010factor","volume":"8","author":"Duarte S","year":"2007","journal-title":"Quintessence International"},{"key":"e_1_2_7_8_1","first-page":"241","article-title":"Tooth structure removal associated with various preparation designs for posterior teeth","volume":"22","author":"Edelhoff D","year":"2002","journal-title":"International Journal of Periodontics & Restorative Dentistry"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2591.2011.01859.x"},{"key":"e_1_2_7_10_1","doi-asserted-by":"crossref","first-page":"160","DOI":"10.1055\/s-0039-1697824","article-title":"Effect of Hybrid Layer and Thickness on Stress Distribution of Cervical Wedge\u2010Shaped Restorations","volume":"4","author":"Eliguzeloglu E","year":"2010","journal-title":"European Journal of Dentistry"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpor.2010.07.003"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0722.2005.00233.x"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.2341\/04-165"},{"key":"e_1_2_7_14_1","first-page":"291","volume-title":"Fundamentals of Operative Dentistry","author":"Hilton TJ","year":"2006"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1067\/mpr.2002.128492"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1590\/S1678-77572009000300006"},{"key":"e_1_2_7_17_1","unstructured":"National Institute of Dental and Craniofacial Research(2010)Nanostructured Dental Composite Restorative Materials.http:\/\/www.nidcr.nih.gov\/GrantsAndFunding\/See_Funding_Opportunities_Sorted_By\/ConceptClearance\/CurrentCC\/Nanostructred.htm[accessed on15 March 2010]"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jdent.2008.01.007"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-3913(08)60047-5"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1177\/00220345890680111401"},{"key":"e_1_2_7_21_1","first-page":"331","article-title":"A finite element analysis of ceramic restorations in endodontically treated premolars","volume":"21","author":"Seow LL","year":"2008","journal-title":"American Journal of Dentistry"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.2341\/06-83"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-3913(08)60006-2"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jdent.2010.02.007"}],"container-title":["International Endodontic Journal"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1111%2Fj.1365-2591.2011.02005.x","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/j.1365-2591.2011.02005.x","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,30]],"date-time":"2023-10-30T05:47:47Z","timestamp":1698644867000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/j.1365-2591.2011.02005.x"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2012,1,14]]},"references-count":23,"journal-issue":{"issue":"6","published-print":{"date-parts":[[2012,6]]}},"alternative-id":["10.1111\/j.1365-2591.2011.02005.x"],"URL":"https:\/\/doi.org\/10.1111\/j.1365-2591.2011.02005.x","archive":["Portico"],"relation":{},"ISSN":["0143-2885","1365-2591"],"issn-type":[{"value":"0143-2885","type":"print"},{"value":"1365-2591","type":"electronic"}],"subject":[],"published":{"date-parts":[[2012,1,14]]},"assertion":[{"value":"2012-01-14","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}