Efeito da aplicação de laser e fosfato de cálcio na permeabilidade e resistência de união da dentina humana

• Autor(a) principal: Pampuri, Camila Reis [UNESP]
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156565; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-05-10/000899632.pdf
• topic: Permeabilidade; Fosfato de cálcio; Lasers em odontologia; Resistência de materiais

The objective of this study was to evaluate in vitro the effect of the use of calcium phosphate and application of laser in the permeability of human dentin and bond strength, modifying the application technique of the universal adhesive system for the purpose of forming a dentine with permeability reduced. Dentine discs were used with approximately 6mm in diameter and 1,5mm height, obtained from healthy human molars. Dentin permeability was measured in four stages: initial, maximum, during treatment and after treatment. After specimens standarization (n = 40) were divided into two groups with (CFC) and without (SFC) the application of calcium phosphate and then was divided into two subgroups, resulting in 4 subgroups (n = 10):, AL- Adhesive + Laser, FAL- Calcium phosphate + Adhesive + Laser, LAL- Laser + adhesive + Laser, FLAL- Calcium phosphate + Laser + Adhesive + Laser. The application of Nd: YAG laser with energy of 60 mJ was without contact. The results of permeability showed that groups LAL (Laser + Adesivo + Laser)(p=0,005) e FLAL (Fosfato + Laser + Adesivo + Laser) (p=0,0001) promoted significant reduction betwen inicial and final permeability. We used the Single Bond Universal (3MESPE) and after curing we restored with Filtek Z 350 XT (3M ESPE) of approximately 1mm in diameter. The specimens was submitted to 1000 thermal cycles, and later was used microtensile test. The data were submitted to the Tukey test (α = 5%). It was observed that in the bond strength the Phosphate application presented the highest mean, which differed statistically from the group without application of the Phosphate and the different treatments did not present statistically significant differences. In addition, they were observed in scanning electron microscopy (SEM)....(Complete abstract eletronic access below)