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  • Title: Photoelastic stress analysis of different attachment systems on implant-retained and conventional palatal obturator prostheses.
    Author: do Prado Ribeiro P, Goiato MC, Pellizzer EP, Pesqueira AA, Haddad MF, Alves-Rezende MC, dos Santos DM.
    Journal: J Craniofac Surg; 2011 Mar; 22(2):523-6. PubMed ID: 21403545.
    Abstract:
    BACKGROUND: Considering that an increasing number of patients are victims of mutilator surgical resections, these studies are important for treatment success of rehabilitation of patients presenting oronasal communication. PURPOSE: The aim of this study was to assess the stress distribution through photoelasticity in palatal obturator prostheses with different attachment systems for implants. METHODS: Two photoelastic models were obtained from an experimental maxillary model presenting an oronasal communication. One model was fabricated without implant, and the other with 2 implants 10 mm in length inserted in the left crest. Four colorless palatal obturator prostheses were fabricated. One prosthesis presented no attachment system, whereas the remaining prostheses were adapted to 3 attachment systems. The assembly was positioned in a circular polariscope for application of axial load. RESULTS: The results were based on photographic records of stress in the photoelastic model submitted to loading. The records revealed higher stress concentration on the bar-clip system followed by the O'ring/bar-clip and O'ring systems, respectively. A homogeneous stress distribution was observed on the photoelastic model with the mucous-supported prosthesis. CONCLUSIONS: The attachment systems generated different characteristics of stress distribution that was concentrated surrounding the implants. The bar-clip system exhibited the highest stress concentration on the alveolar crest.
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