Special Section on Optical Methods of Imaging in the Skin

Stress analysis in oral obturator prostheses: imaging photoelastic

[+] Author Affiliations
Aldiéris Alves Pesqueira, Marcelo Coelho Goiato, Daniela Micheline dos Santos, Marcela Filié Haddad, Agda Marobo Andreotti, Amália Moreno

São Paulo State University-UNESP, Araçatuba School of Dentistry, Department of Dental Materials and Prosthodontics, Araçatuba, São Paulo, Brazil

J. Biomed. Opt. 18(6), 061203 (Nov 09, 2012). doi:10.1117/1.JBO.18.6.061203
History: Received June 25, 2012; Revised September 5, 2012; Accepted September 20, 2012
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Abstract.  Maxillary defects resulting from cancer, trauma, and congenital malformation affect the chewing efficiency and retention of dentures in these patients. The use of implant-retained palatal obturator dentures has improved the self-esteem and quality of life of several subjects. We evaluate the stress distribution of implant-retained palatal obturator dentures with different attachment systems by using the photoelastic analysis images. Two photoelastic models of the maxilla with oral-sinus-nasal communication were fabricated. One model received three implants on the left side of the alveolar ridge (incisive, canine, and first molar regions) and the other did not receive implants. Afterwards, a conventional palatal obturator denture (control) and two implant-retained palatal obturator dentures with different attachment systems (O-ring; bar-clip) were constructed. Models were placed in a circular polariscope and a 100-N axial load was applied in three different regions (incisive, canine, and first molar regions) by using a universal testing machine. The results were photographed and analyzed qualitatively using a software (Adobe Photoshop). The bar-clip system exhibited the highest stress concentration followed by the O-ring system and conventional denture (control). Images generated by the photoelastic method help in the oral rehabilitator planning.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Aldiéris Alves Pesqueira ; Marcelo Coelho Goiato ; Daniela Micheline dos Santos ; Marcela Filié Haddad ; Agda Marobo Andreotti, et al.
"Stress analysis in oral obturator prostheses: imaging photoelastic", J. Biomed. Opt. 18(6), 061203 (Nov 09, 2012). ; http://dx.doi.org/10.1117/1.JBO.18.6.061203


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