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MICRO-HARDNESS AND SURFACE ROUGHNESS OF BULK-FILL COMPOSITE RESIN: EFFECT OF SURFACE SEALANT APPLICATION AND TWO BLEACHING REGIMENS

REHAM MOHAMAD ATTİA, EMAN MOHAMED SOBHY, MONA EL SAİD ABD EL HAMEED ESSA

European Journal of General Dentistry - 2023;12(3):169-176

 

Objectives The aim of this study was to assess the impact of applying a surface sealant and two bleaching regimens, on the micro-hardness, and surface roughness of bulk-fill composite resin Materials and MethodsOne-hundred twenty specimens were prepared with a diameter of 5mm and thickness of 4mm using bulk-fill composite. Specimens were subdivided into group 1: (n= 60), in which Fortify surface sealant was used, and group 2 (control): (n= 60), in which specimens were only finished and polished. After applying in-office and at-home bleaching, micro-hardness and surface roughness were measured before and after bleaching. Statistical analysis was performed using Student’s t-test and paired test. ResultsHardness values of group 1 were lower than values of group 2 before and after bleaching, with different bleaching procedures. Applying surface sealant and different bleaching regimens led to a significant difference of surface roughness (p<0.001). ConclusionApplying surface sealant decreases both micro-hardness and surface roughness. The bleaching procedures significantly affect the surface roughness, but not the micro-hardness. Clinical SignificanceSurface sealant can enhance the surface roughness of bulk-fill composite in nonstress bearing area as it reduces the surface micro-hardness.