Comparison of the Microtensile Bond Strength Of Four Different Bulk-Fill Resin Composites Of Class I Cavities With Dentin
Authors: KUTLU Serra , HUBBEZOĞLU İhsan 
Published: August 2019

Objectives: The aim of our study is
to compare the microtensile bond strengths of four different bulk-fill
composites and a microhybrid composite to the dentin.

Materials
and methods: 4
bulk-fill composites and a microhybrid composite were tested. Class I occlusal
cavities were prepared on 25 freshly drawn intact human molar teeth, randomly
divided into five groups [G-aenial posterior(Control group), Estelite Bulk Fill
flow, GrandioSO x-tra, Beautiful Bulk Restorative, Fill-Up] and the cavities
were restorated with five composite systems by using their own adhesive
systems. Completed restoration teeth bukkolingual and mesiodistal sections were
taken, three samples were obtained from each tooth(n:15). Microtensile bond
strength values of groups were measured by universal test machine. Microscopic
changes were examined by SEM. The data were evaluated by one-way ANOVA and
Tukey tests.

Results: While the control group showed the highest microtensile bond strength, Fill-Up group showed the lowest. The control group was statistically significant when compared to the four different bulk-fill groups used in the study(p&lt;0.05). Although the GrandioSO x-tra group showed the highest bonding strength among the bulk-fill composites, the differences between the Beautifil Bulk Restorative and Estelite Bulk Fill flow were statistically insignificant(p&gt;0.05). Fill-Up was found to be statistically significant when compared to the other bulk-fill groups(p&lt;0.05). In SEM analyzes a regular gap is seen along the hybrid layer only in Estelite Bulk Fill flow.

Conclusions: No bulk-fill composite group could reach the value of the bond strength of microhybrid composite. Although the Fill-Up group was used with the etch and rinse adhesive system among the bulk-fill composites, it showed the lowest bond strength.results: While the control group showed the highest microtensile bond strength, Fill-Up group showed the lowest. The control group was statistically significant when compared to the four different bulk-fill groups used in the study(p&lt;0.05). Although the GrandioSO x-tra group showed the highest bonding strength among the bulk-fill composites, the differences between the Beautifil Bulk Restorative and Estelite Bulk Fill flow were statistically insignificant(p&gt;0.05). Fill-Up was found to be statistically significant when compared to the other bulk-fill groups(p&lt;0.05). In SEM analyzes a regular gap is seen along the hybrid layer only in Estelite Bulk Fill flow.Conclusions: No bulk-fill composite group could reach the value of the bond strength of microhybrid composite. Although the Fill-Up group was used with the etch and rinse adhesive system among the bulk-fill composites, it showed the lowest bond strength.Results: While the control group showed the highest microtensile bond strength, Fill-Up group showed the lowest. The control group was statistically significant when compared to the four different bulk-fill groups used in the study(p&lt;0.05). Although the GrandioSO x-tra group showed the highest bonding strength among the bulk-fill composites, the differences between the Beautifil Bulk Restorative and Estelite Bulk Fill flow were statistically insignificant(p&gt;0.05). Fill-Up was found to be statistically significant when compared to the other bulk-fill groups(p&lt;0.05). In SEM analyzes a regular gap is seen along the hybrid layer only in Estelite Bulk Fill flow.Conclusions: No bulk-fill composite group could reach the value of the bond strength of microhybrid composite. Although the Fill-Up group was used with the etch and rinse adhesive system among the bulk-fill composites, it showed the lowest bond strength.