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Análise de tensão de diferentes materiais fresados por CAD/CAM em próteses sobre implantes

  • Mascarenhas, Vinicius Ibiapina
Publication Date
Mar 23, 2018
Repositório Institucional UNESP
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In order to better understand the occlusal forces that directly influence the longevity of materials machined in CAD / CAM, tissues and, consequently, rehabilitation treatments, this study intends to evaluate the mechanical stress distribution in implant-supported crowns and the bone-implant interface, analyzing (Lithium disilicate, zirconium dioxide and Enamic hybrid compound) behave in simulated clinical situations with short implants using photoelastic analysis with observation and analysis of the isochromatic fringes. Two external hexagon implants with a diameter of 5 mm and a height of 5.5 and 13 mm were each included in a block of photoelastic resin of dimensions 65 x 30 x 15 mm (width, height and depth), installed crowns in CAD / CAM being one of composite, another of disilicate lithium ceramic and a third of a hybrid ceramic compound. A vertical force of 10 N was sufficient to generate a mechanical response on the resin. Images were taken from the isochromatic fringes observed in front of a circular polaroscope with the use of a semi-professional camera and the data were analyzed in 5 different points around the implant according to the color intensity generated by the isochromatic fringes. After statistical analysis, it was not observed a difference in force distribution on photoelastic resin when compared the different crowns tested, however when the comparison was made between short and long implant, a higher and statistically significant mechanical stress intensity could be observed in the short implants especially in the cervical region. Thus, it can be concluded that short implants suffer from more mechanical stress than large-length implants, but different materials of prosthetic coating on implant crowns do not influence the dissipation of force in the periimplant region according to the methodology studied.

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