{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T14:19:24Z","timestamp":1780582764340,"version":"3.54.1"},"reference-count":47,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2021,5,17]],"date-time":"2021-05-17T00:00:00Z","timestamp":1621209600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>This paper aims to compare, in vitro, the biomechanical properties of an overdenture retained by two bar-retained implants and an overdenture retained by two bar-retained implants with ball attachments. An edentulous mandible model was prepared for the study based on the FRASACO mold with two implants. In the first system, the \u201crider\u201d type (PRECI-HORIX, CEKA) retention structure and the complete mandibular denture with the matrix were made. In the second system, the \u201crider\u201d type retention suprastructure was also used. In the distal part, (CEKA) clips were placed symmetrically, and a complete mandibular denture, together with the matrix on the bar, and the clip patrices were made. A numerical model was developed for each system where all elements were positioned and related to geometric relations, as in reality. The FEA analysis (finite element analysis) was carried out for seven types of loads: with vertical forces of 20, 50, and 100 N and oblique forces of 20 and 50 N acting on individual teeth of the denture, namely central incisor, canine, and first molar. Displacements, stresses, and deformations within the systems were investigated. Maximum denture displacement in the first system was 0.7 mm. Maximum bar stress amounted to 27.528 MPa, and implant stress to 23.16 MPa. Maximum denture displacement in the second system was 0.6 mm. Maximum bar stress amounted to 578.6 MPa, that of clips was 136.99 MPa, and that of implants was 51.418 MPa. Clips cause smaller displacement of the overdenture when it is loaded but generate higher stress within the precision elements and implants compared to a denture retained only by a bar. Regardless of the shape of the precision element, small deformations occur that mainly affect the mucosa and the matrix.<\/jats:p>","DOI":"10.3390\/ma14102598","type":"journal-article","created":{"date-parts":[[2021,5,17]],"date-time":"2021-05-17T04:25:07Z","timestamp":1621225507000},"page":"2598","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["A Comparison of Biomechanical Properties of Implant-Retained Overdenture Based on Precision Attachment Type"],"prefix":"10.3390","volume":"14","author":[{"given":"Ma\u0142gorzata","family":"Idzior-Haufa","sequence":"first","affiliation":[{"name":"Department of Gerodontology and Oral Pathology, Poznan University of Medical Sciences, Bukowska Street 70, 60-812 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6128-0315","authenticated-orcid":false,"given":"Agnieszka A.","family":"Pilarska","sequence":"additional","affiliation":[{"name":"Department of Plant-Derived Food Technology, Pozna\u0144 University of Life Sciences, ul. Wojska Polskiego 31, 60-624 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wies\u0142aw","family":"H\u0119dzelek","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, Poznan University of Medical Sciences, Bukowska Street 70, 60-812 Pozna\u0144, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Piotr","family":"Boniecki","sequence":"additional","affiliation":[{"name":"Department of Biosystems Engineering, Pozna\u0144 University of Life Sciences, ul. Wojska Polskiego 50, 60-627 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Krzysztof","family":"Pilarski","sequence":"additional","affiliation":[{"name":"Department of Biosystems Engineering, Pozna\u0144 University of Life Sciences, ul. Wojska Polskiego 50, 60-627 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3659-7761","authenticated-orcid":false,"given":"Barbara","family":"Dorocka-Bobkowska","sequence":"additional","affiliation":[{"name":"Department of Gerodontology and Oral Pathology, Poznan University of Medical Sciences, Bukowska Street 70, 60-812 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,5,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"559","DOI":"10.4103\/ejd.ejd_23_17","article-title":"Prosthodontic maintenance and peri-implant tissue conditions for telescopic attachment-retained mandibular implant overdenture: Systematic review and meta-analysis of randomized clinical trials","volume":"11","author":"Keshk","year":"2017","journal-title":"Eur. J. 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