Influência da terapia fotodinâmica na resistência de união de pinos de fibra de vidro à dentina radicular

• Autor(a) principal: Silva, Paloma Pereira da [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/11449/156740; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-06-12/000901921.pdf
• topic: Tratamento do canal radicular; Fotoquimioterapia; Resistência de união; Pinos dentários; Curcumina; Root canal therapy

Photodynamic therapy (PDT) is based on physical, chemical and biological processes that occur after the use of a photosensitizer (PS) that is activated by means of visible light of specific wavelength, in order to destroy the cell -target. The objective of the present study was to evaluate the influence of the PDT on the bond strength of fiberglass pins in different thirds of the root dentin (cervical, middle and apical) by means of the push-out test. Twenty-four freshly extracted bovine incisor teeth were used, which were radiographed to help confirm the integrity of the entire dental structure. The biomechanical preparation in all root canals was done with K-type instruments, the final instrument being K # 80, 1mm short of the actual tooth length and irrigation with 1% sodium hypochlorite solution. Three groups (n = 8) were distributed: G1-Control (deionized water); G2-PS curcumin 500 mg / L + Blue LED (PDT) and G3-PS curcumin 1000 mg / L + Blue LED (PDT). Groups G2 and G3 received PS curcumin for a period of 5 minutes (pre-irradiation period), which were agitated for 60 seconds with ultrasound (passive irrigation - without refrigeration), on the power scale 2 for Endodontics with the aid of A K # 25 file 2mm below the actual working length (AWL). The PS curcumin was activated with 480 nm Led λ, yielding 75 J / cm2, for 4 minutes, with the aid of a flexible optical fiber with a diameter of 500 μm, taken to 2 mm below the AWL. Then the root canals were dried and filled with # 80 main gutta-percha cones and auxiliary gutta-percha cones F and MF. The root canals were prepared to receive the White Post DCE # 2 fiberglass pins, which were cemented into the root canal using the RelyX U200 self-adhesive resin cement. The union strength was measured by the universal test machine push-out test in the thirds of the root dentin (cervical, middle and apical). Mechanical property data were submitted to the normality test...