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Journal of Biomedical Optics

Stress analysis in oral obturator prostheses, part II: photoelastic imaging
Author(s): Aldiéris Alves Pesqueira; Marcelo Coelho Goiato; Emily Vivianne Freitas da Silva; Marcela Filié Haddad; Amália Moreno; Abbas Zahoui; Daniela Micheline dos Santos
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Paper Abstract

In part I of the study, two attachment systems [O-ring; bar-clip (BC)] were used, and the system with three individualized O-rings provided the lowest stress on the implants and the support tissues. Therefore, the aim of this study was to assess the stress distribution, through the photoelastic method, on implant-retained palatal obturator prostheses associated with different attachment systems: BOC—splinted implants with a bar connected to two centrally placed O-rings, and BOD—splinted implants with a BC connected to two distally placed O-rings (cantilever). One photoelastic model of the maxilla with oral-sinus-nasal communication with three parallel implants was fabricated. Afterward, two implant-retained palatal obturator prostheses with the two attachment systems described above were constructed. Each assembly was positioned in a circular polariscope and a 100-N axial load was applied in three different regions with implants by using a universal testing machine. The results were obtained through photograph record analysis of stress. The BOD system exhibited the highest stress concentration, followed by the BOC system. The O-ring, centrally placed on the bar, allows higher mobility of the prostheses and homogeneously distributes the stress to the region of the alveolar ridge and implants. It can be concluded that the use of implants with O-rings, isolated or connected with a bar, to rehabilitate maxillectomized patients allows higher prosthesis mobility and homogeneously distributes the stress to the alveolar ridge region, which may result in greater chewing stress distribution to implants and bone tissue. The clinical implication of the augmented bone support loss after maxillectomy is the increase of stress in the attachment systems and, consequently, a higher tendency for displacement of the prosthesis.

Paper Details

Date Published: 27 June 2014
PDF: 5 pages
J. Biomed. Opt. 19(6) 066012 doi: 10.1117/1.JBO.19.6.066012
Published in: Journal of Biomedical Optics Volume 19, Issue 6
Show Author Affiliations
Aldiéris Alves Pesqueira, Univ. Estadual Paulista "Júlio de Mesquita Filho" (Brazil)
Marcelo Coelho Goiato, Univ. Estadual Paulista "Júlio de Mesquita Filho" (Brazil)
Emily Vivianne Freitas da Silva, Univ. Estadual Paulista "Júlio de Mesquita Filho" (Brazil)
Marcela Filié Haddad, Univ. Federal de Alfenas (Brazil)
Amália Moreno, Univ. Estadual Paulista "Júlio de Mesquita Filho" (Brazil)
Abbas Zahoui, Univ. do Sagrado Coração (Brazil)
Daniela Micheline dos Santos, Univ. Estadual Paulista "Júlio de Mesquita Filho" (Brazil)

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