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Influ??ncia da composi????o de um adesivo experimental na cin??tica de convers??o, resist??ncia ?? flex??o e radiodensidade

By Fabr??cio Mezzomo Collares, Vicente Castelo branco Leitune, Fabr??cio A. Ogliari, Evandro Piva, Vania Regina Camargo Fontanella and Susana Maria Werner Samuel

Abstract

Purpose: To evaluate the effect of the addition of three radiopaque agents to an experimental adhesive on conversion kinetics, flexural strength and radiodensity. Methods: The model adhesive was formulated by mixing 50 wt% Bis-GMA, 25 wt% TEGDMA and 25 wt% HEMA. Barium sulfate, Titanium dioxide and Zirconium in 0.1, 0.2, 0.4, 0.8 and 1.6 wt% were added separately resulting in 15 experimental groups and 1 control group. The conversion kinetics of the model adhesive was evaluated using real time Fourier Transform Infrared Spectroscopy. The flexural tests were performed on 5 specimens (12 ?? 2 ?? 2 mm) for each group (total n = 80) in a universal testing machine. The radiodensity was evaluated by using an aluminum step-wedge and VistaScan phosphorous plates radiographs digital system with 0.6 s exposure and focal distance of 40 cm. Results: No statistical difference (P > 0.05) was found in flexural strength among all groups. The values of degree of conversion ranged from 45.51% e 62.46%. All groups showed higher values than 0.54 mm of aluminum for the evaluation of radiopacity. Conclusion: The addition of radiopaquing agents increased the adhesive radiodensity and did not affect its degree of conversion and flexural strength

Topics: Dental adhesive, Radiopaque, Degree of conversion, Flexural strength
Publisher: ediPUCRS
Year: 2009
OAI identifier: oai:agregador.ibict.br.RI_UFPEL:oai:repositorio.ufpel.edu.br:123456789/795
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