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Journal of Long-Term Effects of Medical Implants
SJR: 0.133 SNIP: 0.491 CiteScore™: 0.89

ISSN Print: 1050-6934
ISSN Online: 1940-4379

Journal of Long-Term Effects of Medical Implants

DOI: 10.1615/JLongTermEffMedImplants.2019029265
pages 277-283

RETRACTED
Finite-Element Analysis of Stress and Strain in Mandibular Overdentures Supported by Splinted versus Nonsplinted Implants

Paniz Fasih
Department of Prosthdontics, Dental School, Shahid Behesti University of Medical Sciences, Tehran, Iran
Majid Sedaghat Monfared
Department of Prosthdontics, Dental School, Shahid Behesti University of Medical Sciences, Tehran, Iran
Ardeshir Lafzi
Department of Prosthdontics, Dental School, Shahid Behesti University of Medical Sciences, Tehran, Iran
Amir Mahmoudi Motlagh
Department of Prosthdontics, Dental School, Shahid Behesti University of Medical Sciences, Tehran, Iran
Mohammad Dehghan
Department of Prosthdontics, Dental School, Shahid Behesti University of Medical Sciences, Tehran, Iran
Forouzan Faghani
Department of Prosthdontics, Dental School, Shahid Behesti University of Medical Sciences, Tehran, Iran

ABSTRACT

RETRACTION STATEMENT: The authors of this retracted article were not the researchers who led the study described therein, and due to interdepartmental miscommunications published the information without permission from or communication with the lead researchers.

The objective of the current study is to investigate the relative effect of splinted and nonsplinted implants on stress and strain in the supporting tissue around implants in two-implant-supported mandibular overdentures. Two models of mandibular overdentures using locators (nonsplinted implants) and bar locators (splinted implants) were constructed, and a vertical load of 100 N was placed on the central fossa of the mandibular first molar. Stress and strain values were obtained using three-dimensional finite-element analysis (ANSYS R18.0). Splinting reduced stress in peri-implant bone in the ipsilateral implant by half and in the contralateral implant by a quarter. Greater stress and a rise in strain from 59 to 79 με in the posterior ridge were also observed with splinting. The model with splinted implants showed more favorable stress distribution in peri-implant bone, perhaps due to better distribution through the bar and the posterior ridge. These findings should be corroborated with clinical studies.