IADR Abstract Archives
The Effect of Finishing/Polishing Systems and thermocycling on the Surface Hardness and Roughness of Different Resin Composites
Objectives: The aim of this study was to compare different Finishing/Polishing (F/P) systems on the surface hardness and roughness of different resin composites before and after thermocycling.
Methods: A total of 126 composite disks (8x2mm) made of microhybrid (G Aenial Posterior) and nanohybrid (Filtek Z550 and Clearfil Majesty Posterior) were polished with Enhance (Dentisply), One Gloss PS (Shofu) or Sof-Lex Spiral finishing and polishing wheels. The average microhardness, surface roughness before and after 10.000 thermocycling were measured. Statistical analyses were done by the three-way ANOVA test. Bonferroni test was done for pair-wise multiple comparisons.
Results: In all F/P systems at baseline and after thermocycling, the G-Aenial Posterior showed the lowest (p < 0.05) microhardness values when compared with the other tested resin composites. Clearfil Majesty Posterior and Filtek Z550 exhibited similar microharness values. Microhardness values of all composites decreased according to baseline after thermocycling application. The lowest surface roughness results were observed in Sof-Lex Spiral applied resin composites (p > 0.05). Each composites exhibited similar surface roughness with each other in case of using same F/P system. Also, thermocycling did not significantly affect the surface roughness of the resin composites.
Conclusions: F/P system affects the microhardness values of Clearfil Majesty Posterior and G Aenial Posterior significantly, but same is not valid for Z550. Also, F/P has not a statistically significant influence on the resin composite surface roughness (p > 0.001).
Methods: A total of 126 composite disks (8x2mm) made of microhybrid (G Aenial Posterior) and nanohybrid (Filtek Z550 and Clearfil Majesty Posterior) were polished with Enhance (Dentisply), One Gloss PS (Shofu) or Sof-Lex Spiral finishing and polishing wheels. The average microhardness, surface roughness before and after 10.000 thermocycling were measured. Statistical analyses were done by the three-way ANOVA test. Bonferroni test was done for pair-wise multiple comparisons.
Results: In all F/P systems at baseline and after thermocycling, the G-Aenial Posterior showed the lowest (p < 0.05) microhardness values when compared with the other tested resin composites. Clearfil Majesty Posterior and Filtek Z550 exhibited similar microharness values. Microhardness values of all composites decreased according to baseline after thermocycling application. The lowest surface roughness results were observed in Sof-Lex Spiral applied resin composites (p > 0.05). Each composites exhibited similar surface roughness with each other in case of using same F/P system. Also, thermocycling did not significantly affect the surface roughness of the resin composites.
Conclusions: F/P system affects the microhardness values of Clearfil Majesty Posterior and G Aenial Posterior significantly, but same is not valid for Z550. Also, F/P has not a statistically significant influence on the resin composite surface roughness (p > 0.001).