Editorial Type:
Article Category: Other
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Online Publication Date: 01 Jun 2015

Photoelastic Analysis on Different Retention Methods of Implant-Supported Prosthesis

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Page Range: 258 – 263
DOI: 10.1563/AAID-JOI-D-12-00200
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The aim of this study was to evaluate the stress distribution of different retention systems (screwed, cemented, and mixed) in 5-unit implant-supported fixed partial dentures through the photoelasticity method. Twenty standardized titanium suprastructures were manufactured, of which 5 were screw retained, 5 were cement retained, and 10 were mixed (with an alternating sequence of abutments), each supported by 5 external hexagon (4.0 mm × 11.5 mm) implants. A circular polariscope was used, and an axial compressive load of 100 N was applied on a universal testing machine. The results were photographed and qualitatively analyzed. We observed the formation of isochromatic fringes as a result of the stresses generated around the implant after installation of the different suprastructures and after the application of a compressive axial load of 100 N. We conclude that a lack of passive adaptation was observed in all suprastructures with the formation of low-magnitude stress in some implants. When cemented and mixed suprastructures were subjected to a compressive load, they displayed lower levels of stress distribution and lower intensity fringes compared to the screwed prosthesis.

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  <sc>Figure 1.</sc>
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Figure 1.

Demonstration of the results after installation of the suprastructures (passive fit). (a) Screwed suprastructures; (b) cemented suprastructures; (c) mixed suprastructures 1; and (d) mixed suprastructures 2.


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  <sc>Figure 2.</sc>
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Figure 2.

Demonstration of the results observed after application of a 100-N compressive load. (a) Load application on screwed suprastructures; (b) load application on cemented suprastructures; (c) application of mixed load 1; and (d) application of mixed load 2.


Contributor Notes

Corresponding author, e-mail: draangelicacp@uol.com.br
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