Influence of cavity preparation method, high speed turbine and Er:YAG laser, on hybrid layer thickness of different adhesive systems / Influência do método de preparo cavitário, alta rotação e laser de Er:YAG, sobre a espessura da camada híbrida de diferentes sistemas adesivos, com diferentes filosofias adesivas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The objective of this study was to compare the thickness of the hybrid layer formed using Scotchbond Multipurpose Plus, Single Bond 2, Prime &Bond 2.1 and Xeno III on dentine surface, prepared with a diamond bur in a high speed handpiece, or prepared with an Er:YAG laser, used with two parameters of pulse energy (200 and 400 mJ) and two parameters of frequency (4 and 6 Hz). Flat dentine surfaces obtained from twenty third molars human teeth were treated with the two methods, and then were prepared with the dentine adhesive systems, according to manufacturers instructions. After a layer of composite was applied, specimens were sectioned, flattened, polished and prepared for Scanning Electronic Microscopy observation. Five different measurements of hybrid layer thickness were obtained along the bonded surface in each specimen. Results were statistically analyzed using analysis of variance and Student-Newman-Keuls tests (p ≤ 0.05), and using Kruskal Wallis and Mann Whitney tests (p ≤ 0.05). The statistical analysis was made considering two observations parameters, the presence of the hybrid layer, and its thickness. When analyzing the hybrid layer thickness, and comparing the cavity preparation method, four groups were formed, Group I (diamond bur) >Group II (Laser 200 mJ / 4 Hz) = Group III (Laser 200 mJ / 6 Hz) >Group IV (Laser 400 mJ / 4 Hz) >Group V (Laser 400 mJ / 6 Hz). When comparing the dentine adhesive systems, it was not found any statistically significant difference. When analyzing the presence of hybrid layer, and comparing the cavity preparation method, three groups were formed (Group I ≠ Group II = Group III = Group IV ≠ Group V). When comparing the dentine adhesive systems, it was not found any statistically significant difference. When analyzing the hybrid layer thickness, and comparing the cavity preparation method x the dentine adhesive systems, it was found seven different groups. These results showed that the four tested dentine adhesive systems produce a 2.90 1.71 μm hybrid layer in dentine prepared with diamond bur. This hybrid layer was regular and constantly found. In the laser groups, the dentine adhesive systems produced hybrid layers ranging from 0.41 1.00 μm to 2.06 2.49 μm, which were very irregular and were not found constantly. It was also concluded that Er:YAG laser with the parameters used in this experiment, is a negative influence to the hybrid layer formation, and that cavity preparation methods do influence the hybrid layer formation.

ASSUNTO(S)

adesivos dentários dentine adhesive systems preparo da cavidade dentária lasers cavity preparation lasers cavidade dentária - preparo adesivos dentinários odontologia lasers em odontologia

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