Influencia da resina composta de baixa viscosidade no selamento marginal em restaurações de composito odontologico

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

This study aimed at evaluating the marginal leakage of resin composite restorations in Class V cavities, with low-viscosity resin interposition between the adhesive and the restorative resin. Thirty-six Class V cavities were prepared on the facial and lingual surfaces at the cemental-enamel-dentine junction so that the occlusal wall was in enamel and the cervical one in dentine. The cavities were patterned as 3mm (±0.2mm) high, and 3mm(±0.2mm) wide by a 2mm(±0.2mm) depth. For restorative materials, we have used a medium-viscosity resin composite, and its accompanying adhesive agent, and two low-viscosity resins. Ali of the 36 cavities were divided up into three groups. The following procedure was carried out: Group I - Etehing, Single Bond application and single-increment restoration with a Filtek Z 250 resin; Group II - Etching, Single Bond application, light curing, a low-viscosity resin layer (Flow-it), light curing, and restoration with a Filtek Z 250 resin; Group 111 - Etching, Single Bond adhesive application, light curing, a low-viscosity resin layer Protect Liner F, light curing, and restoration with a Filtek Z 250 resin. The teeth were stored in distilled water at 37°C for 24 hours. Following the finishing and polishing process, the dental surfaces were coated with nail varnish, except for 1 mm off the restoration margins and were immersed in 50% silver nitrate for 24 hours in total darkness. Then, the teeth were rinsed and stored in developing photographic solution, for 12 hours under visible light. After that, they were sectioned longitudinally. Each section was polished with 320, 400, 600, 1000 wet sandpaper and with 6, 3, 1, and 1/4 micra diamond paste. Then, the sections were placed in stereoscopic loupe, where the total length of the silver nitrate penetration at the tooth-restoration interface and the total length of the cavity were measured. The division between the two measurements multiplied by 100 resulted in the percentages of leakage which underwent the Kuskal-Wallis (p<0.05) test. The resulting mean values were: Group I = 21.11 %; Group II = 7.89%; Group III = 2.65%. The mean percentage value exhibited by Group III was statistically lower as compared to those displayed by Groups I and II, which did not exhibit statistical difference between them

ASSUNTO(S)

resinas dentarias infiltração materiais dentarios adhesive agents resin composite marginal leakage adesivos dentarios

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