Influência de dois sistemas adesivos e de duas técnicas de fotopolimerização na microinfiltração marginal de restaurações Classe V após preparo com alta rotação e condicionamento com laser de Er:YAG.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The purpose of this study In vitro was to evaluate the influence of two abrasive systems and two photoactivation techniques on marginal microleakage in Class V restorations prepared with high speed rotation and Er:YAG laser conditioning. Besides, this study intended to observe, through scanning electron microscopy, the interfaces resin/dentin and resin/enamel of all sample groups. A hundred twelve third human molars were selected and divided into sixteen groups, so that eighty teeth were destined to the study of marginal microleakage (groups I, II, III, IV, IV,VI, VII and VIII) and thirty-two to the analysis under scanning electron microscopy(groups A, B, C, D, E, F, G and H). In all the groups, Class V cavities were prepared with high speed rotation. In groups, V, E, VI, F, VII G, VIII and H, after cavity preparation, the enamel and the dentin were conditioned with Er:YAG laser(Kavo Key Laser, 250mj, 3Hz, 300 pulses). Groups I, A, V and E were restored with the Prime &Bond NT/Esthet X system and photoactivated with current visible light; groups II, B, VI and F were restored with the Prime &Bond NT/Esthet X system and photoactivated with Argon laser (l = 488nm); groups III, C, VI and G were restored with the Single Bond/Z250 system and photoactivated with current visible light; and groups IV, D, VIII and H were restored with the Single Bond/Z250 system and photoactivated with Argon (l = 488nm). Mann Whintey test was applied in order to study the marginal microleakage and the results showed significant differences (p<0,05) for the dentin in the groups that were conditioned with Er:YAG laser, when the restorative system was altered, showing lower levels of dye infiltration when the Single Bond/Z250 system was applied, regardless of the source of light used (comparison between groups V and VI and groups VI and VIII). These differences were verified under scanning electron microscopy, which showed the absence of cracks and higher smoothness on the surface in groups G and H, suggestive of better micromechanical imbrication. When the Single Bond system was applied, the use of Argon laser presented lower levels of marginal microleakage than the current visible light (comparison between groups VII and VIII). In all the groups restored with the Prime &Bond NT/Esthet X system, the presence of cracks of 10m or more on the resin/dentin and resin/enamel interfaces was detected. In the experimental conditions of this study it is possible to conclude that the use of the SingleBond/Z250 system photoactivated with Argon laser provided lower levels of marginal microleakage and a adequate micromechanical imbrication on dentin, under scanning electron microscopy, and it seems to be more appropriated to restore cavities after Er:YAG laser conditioning.

ASSUNTO(S)

microinfiltração marginal odontologia social e preventiva microscopia eletrônica de varredura laser de er:yag

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