{"title":"Can an increase in abutment screw length enable biomechanical advantages for implants with increased crown height space?","authors":"Mert Keleş, Hamiyet Güngör Erdoğan, Burak Yılmaz","doi":"10.1111/jopr.14070","DOIUrl":null,"url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this finite element analysis (FEA) study was to investigate how screw length and crown height affect the stresses generated in the implant-abutment complex and alveolar bone for anterior single implants and whether the use of longer abutment screw would compensate for increased stresses originated from increased crown height space (CHS).</p><p><strong>Materials and methods: </strong>A maxillary anterior segment was modeled, and one implant (Straumann bone level implants, 4.1 mm × 12 mm) was placed at the central incisor site. Three different crown heights (11, 13, and 15 mm) with two different abutment screw lengths (regular [R] 7.9 and long [L] 9.9 mm) were modeled, and coded as M 11-R, M 13-R, M 15-R, M 11-L, M 13-L, and M 15-L depending on the height and length, respectively. Horizontal (25.5 N) and 30-degree oblique forces (178 N) were applied to the crown. The stress magnitude and distribution were evaluated.</p><p><strong>Results: </strong>M 15-L showed the highest von Mises stress value (869.72 MPa) at the abutment under oblique loads. For both screw lengths, von Mises stress values in the abutment, abutment screw, and inside and outside of the implant walls around the implant platform increased with increased crown height. With the increase in length of the abutment screw, the von Mises stresses decreased in the inside and outside walls of the implant, while the stresses in the abutment increased.</p><p><strong>Conclusions: </strong>Abutment screw length and crown height affected the amount of stress generated on implant components. Increasing the screw length may reduce the stresses on the implant and bone without increasing the stresses in the screw, potentially mitigating the risk of implant platform fractures and bone resorption, both of which are critical failures. Screw related issues may decrease as the area stresses effect has a tendency to reduce when longer screw is used in increased CHS situation (tall crowns).</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4000,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1111/jopr.14070","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
引用次数: 0
Abstract
Purpose: The purpose of this finite element analysis (FEA) study was to investigate how screw length and crown height affect the stresses generated in the implant-abutment complex and alveolar bone for anterior single implants and whether the use of longer abutment screw would compensate for increased stresses originated from increased crown height space (CHS).
Materials and methods: A maxillary anterior segment was modeled, and one implant (Straumann bone level implants, 4.1 mm × 12 mm) was placed at the central incisor site. Three different crown heights (11, 13, and 15 mm) with two different abutment screw lengths (regular [R] 7.9 and long [L] 9.9 mm) were modeled, and coded as M 11-R, M 13-R, M 15-R, M 11-L, M 13-L, and M 15-L depending on the height and length, respectively. Horizontal (25.5 N) and 30-degree oblique forces (178 N) were applied to the crown. The stress magnitude and distribution were evaluated.
Results: M 15-L showed the highest von Mises stress value (869.72 MPa) at the abutment under oblique loads. For both screw lengths, von Mises stress values in the abutment, abutment screw, and inside and outside of the implant walls around the implant platform increased with increased crown height. With the increase in length of the abutment screw, the von Mises stresses decreased in the inside and outside walls of the implant, while the stresses in the abutment increased.
Conclusions: Abutment screw length and crown height affected the amount of stress generated on implant components. Increasing the screw length may reduce the stresses on the implant and bone without increasing the stresses in the screw, potentially mitigating the risk of implant platform fractures and bone resorption, both of which are critical failures. Screw related issues may decrease as the area stresses effect has a tendency to reduce when longer screw is used in increased CHS situation (tall crowns).
期刊介绍：
The Journal of Prosthodontics promotes the advanced study and practice of prosthodontics, implant, esthetic, and reconstructive dentistry. It is the official journal of the American College of Prosthodontists, the American Dental Association-recognized voice of the Specialty of Prosthodontics. The journal publishes evidence-based original scientific articles presenting information that is relevant and useful to prosthodontists. Additionally, it publishes reports of innovative techniques, new instructional methodologies, and instructive clinical reports with an interdisciplinary flair. The journal is particularly focused on promoting the study and use of cutting-edge technology and positioning prosthodontists as the early-adopters of new technology in the dental community.
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