Avaliação das fendas marginais em restaurações de resina composta com variação de alguns determinanates clínicos

• Autor(a) principal: Gallito, Marco Antonio
• Data de Publicação: 2008
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13985
• topic: Resin composite; Gaps; Microscopy eletronic; Resina composta; Fendas marginais; Microscopia eletrônica; Resinas compostas; Cavidade da polpa dentária; Microscopia eletrônica de varredura; Adaptação marginal (Odontologia); CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The objective of this study was to compare through the cracks measurements in the dentin resin interface, using some variables: light activation with halogenic lamp and with LED; the use of micro-hybrid resin with or without nanofiller (Filtek Z350 anda Filtek Z250); variation of the adhesive systems (Adper Single Bond 2 or Scotchbond Multi Purpose); variation of the temperature in the compound resin; to use or not use the dentin desensitizing; to remove or not the dentin collagen and the light intensity variation in the light-curing. It was used 70 human extracted molars, with circular cavities in the superficial dentin of each proximal face; they were divided in 10 samples to each supra cited variable. The teeth were restored, followint the manufacturer instructions, and they were kept in a bacteriologtical kiln during a seven days period. After this time, the teeth were glossed, the resin replica were made from an addition silicone casting and these were took to the MEV, to be analyzed. The cracks were measured with the help of a UTHSCSA tool image software and the data were submited to an statistical analysis with the Student t test. The results obtained give the following conclusions: the lower values of marginal cracks were obtained when it was used the halogenic light (t = 3,246 and p = 0,02) and due the intensity variation of this light (t = 8,808 and p = 0,00). The lowest values related to the cracks were found when the Filtek Z350 resin was compared to the Filtek Z250 resin (t = 0,426 and p = 0,672), and when the Adper Scotchbond Multipurpose adhesive was compared with the Adper Single Bond 2 system (t = 0,883 and p = 0,382). The greatest values of marginal cracks were obtained with Filtek Z350 resin preheated at 60 degrees (t = -3,961 and p = 0,00); with the use of dentin desensitizing (t = -3,062 and p = 0,004) and with the removal of the collagen by using sodium hypochlorite (t = -8,808 and p = 0,000).