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For that, 126 ESDI (of 5\u2009mm length) were allocated in four groups based on diameter (\u00d84 and \u00d86\u2009mm) and prostheses (SC and FPD): SC4, SC6, FPD4, and FPD6. The fatigue test was performed by step\u2010stress accelerated life testing (<jats:italic>n<\/jats:italic>\u2009=\u200921\/group), failure mode by fractographic analysis, and stress distribution by finite element analysis: von Mises stress (<jats:italic>\u03c3<\/jats:italic><jats:sub>vM<\/jats:sub>), maximum shear stress (<jats:italic>\u03c4<\/jats:italic><jats:sub>max<\/jats:sub>), and minimum principal stress (<jats:italic>\u03c3<\/jats:italic><jats:sub>min<\/jats:sub>). Reliability at 200\u2009N was higher than 84% in both SC4 and SC6, with SC6 showing significantly higher reliability at 300\u2009N. Failure mode involved the abutment (SC4 and SC6). The missions were suspended for the FPD groups due to 100% survival at the maximum load. The <jats:italic>\u03c3<\/jats:italic><jats:sub>vM<\/jats:sub> showed a stress reduction of about 40% at the SC6 implant when compared to SC4 and FPD6 compared to FPD4. For the abutment, a minor decrease of at least 6.72% was observed comparing SC6 to SC4 and 2.78% for the FPD6 compared to FPD4. The <jats:italic>\u03c4<\/jats:italic><jats:sub>max<\/jats:sub> and <jats:italic>\u03c3<\/jats:italic><jats:sub>min<\/jats:sub> in the cortical bone demonstrated a stress reduction of at least 38.85% for the SC6 compared to SC4 and at least 3.78% in FPD6 compared to FPD4. The <jats:italic>\u03c3<\/jats:italic><jats:sub>min<\/jats:sub> in the cancellous bone showed an overall reduction of at least 8.46% for SC6 compared to SC4 and for FPD6 compared to FPD4. But, for <jats:italic>\u03c4<\/jats:italic><jats:sub>max<\/jats:sub>, in the cancellous bone, a 19.42% higher stress was found in SC6 compared to SC4 and 27.21% in FPD6 compared to FPD4. Finally, when splinting was used, a general stress reduction was found, about 50% in both diameters in the implant and abutment. According to the limitations of this in\u00a0vitro study, it is possible to conclude that both groups (SC4 and SC6) showed high reliability in clinically relevant loads for the posterior atrophic mandible, SC6 having the lowest probability of failure at 300\u2009N, with failure restricted to the abutment. Meanwhile, FPD6 has better stress distribution.<\/jats:p>","DOI":"10.1002\/jbm.b.35560","type":"journal-article","created":{"date-parts":[[2025,3,11]],"date-time":"2025-03-11T22:45:52Z","timestamp":1741733152000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["In Vitro Reliability and Stress Distribution of Wide Diameter Extra\u2010Short Implants as Support for Single Crowns and Fixed Partial Dentures"],"prefix":"10.1002","volume":"113","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3334-6297","authenticated-orcid":false,"given":"Vanessa Felipe","family":"Vargas\u2010Moreno","sequence":"first","affiliation":[{"name":"Departamento de Pr\u00f3tese e Periodontia da Universidade Estadual de Campinas (UNICAMP) Faculdade de Odontologia de Piracicaba (FOP)  Piracicaba S\u00e3o Paulo 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