Análise de tensão de diferentes materiais fresados por CAD/CAM em próteses sobre implantes
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Data
2018-03-23
Autores
Mascarenhas, Vinicius Ibiapina [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Buscando o melhor entendimento sobre as forças oclusais que influenciam diretamente na longevidade dos materiais fresados em CAD/CAM, tecidos e, consequentemente, tratamentos reabilitadores, este estudo pretende avaliar a distribuição de tensão mecânica em coroas implantossuportadas e na interface osso-implante, analisando de que maneira diferentes materiais de cobertura protética (dissilicato de lítio, resina composta e composto híbrido Enamic ) se comportam em situações clínicas simuladas com implantes curtos, utilizando a análise fotoelástica com observação e análise das franjas isocromáticas. Dois implantes hexágono externo de diâmetro 5 milímetros e comprimento de 5,5 e 13 milímetros foram incluídos cada um em um bloco de resina fotoelástica de dimensões 65 x 30 x 15 mm (largura, comprimento e profundidade), instalados coroas fresadas em CAD/CAM sendo uma de compósito, outra de cerâmica dissilicato de lítio e uma terceira de um composto cerâmico híbrido. Ao conjunto foi-se submetido uma força vertical de 10 N suficiente para gerar uma resposta mecânica na coroa. Foram colhidas imagens das franjas isocromáticas observadas em frente a um polaroscópio circular com o uso de uma câmera semi-profissional e os dados foram analisados em 5 pontos diferentes ao redor do implante de acordo com a intensidade de cor gerada pelas franjas isocromáticas. Após análise estatística não se observou diferença na dissipação de força na resina fotoelástica quando comparadas as diferentes coroas testadas, no entanto quando a comparação foi feita entre implante curto e longo, pode-se observar uma maior e estatisticamente significante intensidade de estresse mecânico nos implantes curtos principalmente na região cervical. Assim, pode-se concluir que implantes curtos sofrem com mais estresse mecânico que implantes de comprimento maior porém diferentes materiais de revestimento protético em coroas sobre implante não influenciam na dissipação de força na região periimplantar de acordo com a metodologia estudada.
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.
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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Palavras-chave
Prótese dentária fixada por implante, Cerâmica, Odontologia, Implant fixed prosthesis, Ceramics, Dentistry