{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T19:05:04Z","timestamp":1780081504279,"version":"3.54.0"},"reference-count":89,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2025,12,26]],"date-time":"2025-12-26T00:00:00Z","timestamp":1766707200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JFB"],"abstract":"<jats:p>This finite element analysis compared a tissue-level implant with an engaging Ti-base to abutment-free, direct-to-implant, tissue-level configurations (3.7 mm and 4.5 mm platforms; short and long retention screws) to examine how platform width and screw length influence stresses under axial and oblique loads. Five configurations were modeled with identical materials and boundary conditions. Screw preload corresponding to a tightening torque of 35 N\u00b7cm was applied in the first step, followed by either a 400 N axial load or a 300 N at 30\u00b0. Oblique loading dominated the mechanical response, increasing stresses relative to axial loading and concentrating them at the implant neck and first thread, as well as at the crown screw-access and antirotation regions. Under oblique loads, the 3.7 mm platform implant showed the highest stresses, whereas the 4.5 mm platform implant was comparable to or slightly less stressed than the Ti-base configuration, whose peaks remained confined to a small internal recess. Crown stresses remained localized around the antirotation features, while the composite layer bore negligible load. Within the limitations of this numerical model, abutment-free, direct-to-implant workflows may achieve biomechanical performance comparable to Ti-base solutions if platform and screw selection are aligned with the occlusal scheme, but ISO-style fatigue testing and experimental or clinical validation are required.<\/jats:p>","DOI":"10.3390\/jfb17010019","type":"journal-article","created":{"date-parts":[[2025,12,29]],"date-time":"2025-12-29T00:50:42Z","timestamp":1766969442000},"page":"19","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Biomechanical Effects of Platform Diameter and Screw Length in an Abutment-Free Tissue-Level Implant System Compared with a Ti-Base Configuration: 3D Finite Element Analysis"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9522-1356","authenticated-orcid":false,"given":"Aliona","family":"Dodi","sequence":"first","affiliation":[{"name":"Discipline of Prosthodontics, Faculty of Dentistry, Carol Davila University of Medicine and Pharmacy, 37 Dionisie Lupu Street, District 2, 020021 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0055-4655","authenticated-orcid":false,"given":"Alecsandru","family":"Ionescu","sequence":"additional","affiliation":[{"name":"Pedodontics Department, Faculty of Dentistry, Carol Davila University of Medicine and Pharmacy, 37 Dionisie Lupu Street, District 2, 0200221 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mihaela Anca","family":"Marin","sequence":"additional","affiliation":[{"name":"Discipline of Prosthodontics, Faculty of Dentistry, Carol Davila University of Medicine and Pharmacy, 37 Dionisie Lupu Street, District 2, 020021 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emil","family":"Nu\u021bu","sequence":"additional","affiliation":[{"name":"Department of Strength of Materials, Faculty of Industrial Engineering and Robotics, National University of Science and Technology \u201cPolitehnica\u201d Bucharest, 313 Splaiul Independentei, CD building, District 6, 060042 Bucharest, Romania"},{"name":"Romanian Research and Development Institute for Gas Turbines COMOTI, 220D Iuliu Maniu Blvd., District 6, 061126 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6251-833X","authenticated-orcid":false,"given":"Vlad Gabriel","family":"Vasilescu","sequence":"additional","affiliation":[{"name":"Discipline of Dental Prosthesis Technology, Faculty of Dentistry, Carol Davila University of Medicine and Pharmacy, Dionisie Lupu Street, No. 37, District 2, 020021 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9973-1759","authenticated-orcid":false,"given":"Ana Maria Cristina","family":"\u021a\u00e2ncu","sequence":"additional","affiliation":[{"name":"Discipline of Prosthodontics, Faculty of Dentistry, Carol Davila University of Medicine and Pharmacy, 37 Dionisie Lupu Street, District 2, 020021 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0329-5102","authenticated-orcid":false,"given":"Toma Lucian","family":"Ciocan","sequence":"additional","affiliation":[{"name":"Discipline of Dental Prosthesis Technology, Faculty of Dentistry, Carol Davila University of Medicine and Pharmacy, Dionisie Lupu Street, No. 37, District 2, 020021 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2727-3960","authenticated-orcid":false,"given":"Marina","family":"Imre","sequence":"additional","affiliation":[{"name":"Discipline of Prosthodontics, Faculty of Dentistry, Carol Davila University of Medicine and Pharmacy, 37 Dionisie Lupu Street, District 2, 020021 Bucharest, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,12,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Mugri, M.H., Reddy, N.K., Sayed, M.E., Mattoo, K., Qomari, O.M., Alnaji, M.M., Mshari, W.A., Alqarawi, F.K., AlResayes, S.S., and Alshaibani, R.M. 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