Artículos de revistas
Effect of cyclic loading on the bond strength of class II restorations with different composite materials
Registro en:
Operative Dentistry. Operative Dentistry Inc, v. 33, n. 2, n. 163, n. 168, 2008.
0361-7734
WOS:000256041500009
10.2341/07-65
Autor
Cavalcanti, AN
Mitsui, FHO
Silva, F
Peris, AR
Bedran-Russo, A
Marchi, GM
Institución
Resumen
This study evaluated the effect of cyclic loading on the bond strength of Class II restorations using different composite materials. Class II preparations with gingival margins located in dentin were performed on the mesial surface of 80 bovine incisors. The teeth were randomly allocated to eight groups (n=10) according to resin composite (Filtek Z250, Filtek Supreme, Tetric Ceram HB and Esthet-X) and use of cyclic loading. The restorations were bonded with the Single Bond adhesive system. Simulated aging groups were cyclic loaded for 200,000 cycles with 80N load (2Hz). The specimens were vertically sectioned (two slabs per restoration) and further trimmed into an hour-glass shape at the adhesive interface to obtain a final bonded area 1 mm(2). Samples were placed in an apparatus and tested under tension using a universal testing machine. The data were analyzed using two-way ANOVA and Tukey test with a 95% confidence level. Aged groups presented significantly lower means when compared to the groups that were not aged (p=0.03). However, significant differences among composite materials were not observed (p=0.17). Regardless of the restorative composite material used, it could be concluded that the bond strength of Class H restorations at the gingival wall was affected by simulated cyclic loading. 33 2 163 168