Shear bond strength of an adhesive system in human, bovine and swinish teeth

RESUMO

The purpose of this work was to compare the shear bond strength of an adhesive system in human enamel and dentin, as well as in bovine and swinish, after 24 hours and 7 days storage at 37oC water and 100% of relative humidity. Sixty human upper premolars, sixty bovine upper incisors and thirty swinish molars were used. Rigth after the extractions the tooth were cleaned and stored in 0,09% physiologic solution with 0,05% thymol, at 4o C until they were used. The teeth were divided into 12 groups made by 15 specimens, according to the kind of tooth, the surface to be tested and storage period. The surfaces to be tested were planed by using 180 followed by 400 and 600 wet sandpaper and received Prisma Universal Bond 3 adhesive system according to the manufacturer. A polyethylene cilinder 3 mm in diameter was fixed over these surfaces to limit the area and matrix which was filled with Prisma AP.H/Compules resin. Using an Kratus testing machine the bond strength in MPa were enamel 24 hours 37.6 ± 7.81(H); 30.77 ± 5.68(B); 25.54 ± 6.72(S); enamel 7 days 36.17 ± 4.83(H); 36.94 ± 6.72(B); 23.33 ± 25.54 ± 6.72(S); enamel 7 days 36.17 ± 4.83(H); 36.94 ± 6.72(B); 23.33 ± 7.72(S); dentin 24 hours 8.49 ± 2.25 (H); 6.04 ± 2.51(B); 7.99 ± 3.03(S); dentin 7 days 9.37 ± 4.21(H); 7.83 ± 3.15(B); 8.45 ± 4.33(S). Analysis of the values by to Tukey-Kramer test (P<0.05) revealed bond strength in enamel were significantly higher when compared to dentin; bond strength in human enamel did not present significant statistical differences relating to bovine enamel, however both registered significant differences relating to swinish enamel; bond strength obtained in human dentine, bovine and swinish did not present any significant difference among themselves; bond strength obtained after periods storage of 24 hours and 7 days did not present significant statistical differences