Influência de diferentes pigmentos e envelhecimento acelerado sobre a dureza e a resistência à ruptura de silicones faciais
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Data
2017-09-22
Autores
Malavazi, Estefânia Marrega. [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Uma das propriedades mais afetadas prejudicando a durabilidade das próteses bucomaxilofaciais é a estabilidade cromática. São muitas as tentativas de desenvolvimentos de novos pigmentos, mais duradouros, e escalas de cor que facilitem o uso clínico. O presente estudo teve como objetivo analisar a influência de três pigmentos na dureza e resistência à ruptura de silicones submetidos ao envelhecimento acelerado. Para a confecção das amostras, selecionaram-se os silicones faciais A2 A-2186 e Silastic MDX4-4210 e três tipos de pigmentos, nas cores bronze, preto e, um novo pigmento, cor rosa médio. Para cada teste, foram confeccionadas 80 amostras distribuídas em 8 grupos (n=10), de acordo com o tipo de silicone e pigmento adicionado. As amostras foram submetidas aos testes de dureza e resistência à ruptura antes e após 1008 horas de envelhecimento acelerado. Os dados obtidos foram submetidos ao teste de aderência à curva normal, sendo aplicado teste estatístico apropriado para a comparação dos valores médios de cada ensaio realizado. Os testes concluíram que os pigmentos influenciaram na dureza e resistência dos silicones. Também foi observado que o envelhecimento acelerado influenciou todas as propriedades avaliadas, independentemente da adição de pigmentos.
One of the most affected properties damaging the durability of maxillofacial prosthesis is the color stability. There are many attempts to development of new pigments, longer lasting, and color scales to facilitate the clinical use. This study aims to analyze the influence of three pigments in hardness and tear strength of two silicones submitted to accelerated aging. For samples fabrication, we selected the facial silicones A2 A-2186 and Silastic MDX4-4210 and three pigments, in bronze and black, and a new pigment, medium pink color. For each test, a total of 80 samples were fabricated and distributed in 8 groups (n = 10), according to silicone and pigment. The samples were submitted to hardness and tear strength tests before and after 1008 hours of accelerated aging. Data were submitted to the normal curve adherence test, applied appropriate statistical test to compare the mean values for each test performed. The tests concluded that the pigments influenced the hardness and resistance of the silicones. It was also observed that accelerated aging influenced all evaluated properties, regardless of the addition of pigments.
One of the most affected properties damaging the durability of maxillofacial prosthesis is the color stability. There are many attempts to development of new pigments, longer lasting, and color scales to facilitate the clinical use. This study aims to analyze the influence of three pigments in hardness and tear strength of two silicones submitted to accelerated aging. For samples fabrication, we selected the facial silicones A2 A-2186 and Silastic MDX4-4210 and three pigments, in bronze and black, and a new pigment, medium pink color. For each test, a total of 80 samples were fabricated and distributed in 8 groups (n = 10), according to silicone and pigment. The samples were submitted to hardness and tear strength tests before and after 1008 hours of accelerated aging. Data were submitted to the normal curve adherence test, applied appropriate statistical test to compare the mean values for each test performed. The tests concluded that the pigments influenced the hardness and resistance of the silicones. It was also observed that accelerated aging influenced all evaluated properties, regardless of the addition of pigments.
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Palavras-chave
Prótese maxilofacial, Elastômeros de silicone, Dureza, Resistência à flexão, Maxillofacial prosthesis