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Hence, the current study is aimed at estimating the probability of survival of anterior crowns supported by different narrow implant systems. Three different narrow implant systems of internal conical connections were evaluated (\u00d83.5 \u00d7 10\u2009mm): (i) Active (Nobel Biocare), (ii) Epikut (S.I.N. Implant System), and (iii) BLX (Straumann). Abutments were torqued to the implants, and standardized maxillary incisor crowns were cemented. The assemblies were subjected to step\u2010stress accelerated life testing (SSALT) in water through load application of 30 degrees off\u2010axis lingually at the incisal edge of the crowns using a flat tungsten carbide indenter until fracture or suspension. The use level probability Weibull curves and reliability for completion of a mission of 100,000 cycles at 80\u2009N and 120\u2009N were calculated and plotted. Weibull modulus and characteristic strength were also calculated and plotted. Fractured samples were analyzed in a stereomicroscope. The beta (<jats:italic>\u03b2<\/jats:italic>) values were 1.6 (0.9\u20103.1) and 1.4 (0.9\u20102.2) for BLX and Active implants, respectively, and 0.5 (0.3\u20100.8) for the Epikut implant, indicating that failures were mainly associated with fatigue damage accumulation in the formers, but more likely associated with material strength in the latter. All narrow implant systems showed high probability of survival (\u226595%, CI: 85\u2010100%) at 80 and 120\u2003N, without significant difference between them. Weibull modulus ranged from 6 to 14. The characteristic strength of Active, Epikut, and BLX was 271 (260\u2010282)\u2003N, 216 (205\u2010228)\u2003N, and 275 (264\u2010285)\u2003N, respectively. The failure mode predominantly involved abutment and\/or abutment screw fracture, whereas no narrow implant was fractured. Therefore, all narrow implant systems exhibited a high probability of survival for anterior physiologic masticatory forces, and failures were restricted to abutment and abutment screw.<\/jats:p>","DOI":"10.1155\/2020\/1057846","type":"journal-article","created":{"date-parts":[[2020,9,8]],"date-time":"2020-09-08T23:30:37Z","timestamp":1599607837000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Failure Modes and Survival of Anterior Crowns Supported by Narrow Implant Systems"],"prefix":"10.1155","volume":"2020","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5006-2184","authenticated-orcid":false,"given":"Edmara T. P.","family":"Bergamo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6916-1564","authenticated-orcid":false,"given":"Everardo N. 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