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CC BY 4.0 · European Journal of General Dentistry 2023; 12(03): 169-176
DOI: 10.1055/s-0043-1773803
Original Article

Micro-Hardness and Surface Roughness of Bulk-Fill Composite Resin: Effect of Surface Sealant Application and Two Bleaching Regimens

Reham Mohamad Attia 
1   Department of Conservative Dentistry Faculty of Dentistry, Zagazig University, Zagzig, Egypt
,
Eman Mohamed Sobhy
2   Department of Biomaterial Faculty of Dentistry, Tanta University, Tanta, Egypt
,
Mona El Said Abd El Hameed Essa
3   Department of Operative Dentistry Faculty of Dentistry, Beni Suef University, Beni Suef, Egypt
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Abstract

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 Methods One-hundred twenty specimens were prepared with a diameter of 5 mm and thickness of 4 mm 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.

Results Hardness 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).

Conclusion Applying surface sealant decreases both micro-hardness and surface roughness. The bleaching procedures significantly affect the surface roughness, but not the micro-hardness.

Clinical Significance Surface sealant can enhance the surface roughness of bulk-fill composite in nonstress bearing area as it reduces the surface micro-hardness.

Keywords

bulk-fill - composite - at-home bleaching - in-office bleaching - micro-hardness - surface roughness - surface sealant


Publication History

Article published online:
16 October 2023

© 2023. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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