Effect of different surface-cleaning techniques on the bond strength of composite resin restorations
Section snippets
Material and Methods
The project was approved by the institutional review board of Karadeniz Technical University, Trabzon, Turkey. Twenty-five caries-free and restoration-free human molars extracted from individuals between 22 and 50 years of age were used for this study (80% power [type II error]). The teeth were stored in a 0.5% chloramine solution at 4°C for up to 1 month after extraction. The soft tissues were removed with a scaler (Scaler, H6/H7; Hu-Friedy). Each tooth was wet ground occlusally with silicon
Results
The microtensile bond strengths of specimens cleaned with different techniques were compared (Table II, Fig. 2). The MAPA group had the highest bond strength, and the differences between the MAPA group and the remainder of the groups were statistically significant (P<.05). The DA group displayed the second highest bond strength, and the difference between the DA-RRI and DA-Cont groups was statistically significant (P<.05). The third highest bond strength was seen in the Alco group, and the bond
Discussion
The null hypothesis of this study was rejected because significant differences were found between the bond strengths of the definitive restorations and the surface topography of the dentin surfaces treated with a bonding agent when different surface-cleaning methods were used with the DP technique. Both the SEM and AFM analyses revealed a different surface topography for surfaces cleaned with the MAPA technique. The significantly higher bond strength of the composite resin achieved by the MAPA
Conclusion
Within the limitations of this study, the following conclusions can be drawn. The surface-cleaning techniques, except for the RRI technique, increased the bond strength of cement to dentin; the highest bond strength for the cement among the groups was achieved with the MAPA technique; and the use of the MAPA technique displayed the roughest hybridized dentin surfaces.
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