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Two groups (n = 60) were defined, depending on the amount of residual coronal dentin after abutment build-up and final preparation: (1) more than 50% of coronal residual structure; and (2) equal to or less than 50% of coronal residual structure. Within each group, teeth were randomly divided into 2 subgroups (n = 30) according to the material used for luting fiber posts: (A) resin core build-up material, Gradia Core; or (B) self-adhesive universal cement GCem Automix. The rate of success was assessed based on clinical and intra-oral radiographic examinations at the follow-up after 6, 12, 24, 36, and 48 months. The highest 48-month success and survival rates were recorded in group 1A (90% and 100%, respectively), whereas teeth in group 2B exhibited the lowest performance (63.3% success rate, 86.6% survival rate). Cox regression analysis revealed that neither the amount of coronal residual structure nor the luting material significantly influenced the failure risk ( p &gt; .05) ( ClinicalTrials.gov , NCT01532947).<\/jats:p>","DOI":"10.1177\/0022034514527970","type":"journal-article","created":{"date-parts":[[2014,3,20]],"date-time":"2014-03-20T01:11:21Z","timestamp":1395277881000},"page":"52S-58S","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":47,"title":["Four-year Survival of Endodontically Treated Premolars Restored with Fiber Posts"],"prefix":"10.1177","volume":"93","author":[{"given":"J.","family":"Juloski","sequence":"first","affiliation":[{"name":"Department of Medical Biotechnologies, University of Siena, Italy"},{"name":"Clinic for Pediatric and Preventive Dentistry, School of Dentistry, University of Belgrade, 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