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Comparative Evaluation of Depth of Cure of Three High Viscosity Bulk Fill Composites versus Conventional Composite: An In Vitro Study
Int J Clin Prev Dent 2018;14(2):145-151
Published online June 30, 2018;  https://doi.org/10.15236/ijcpd.2018.14.2.145
© 2018 International Journal of Clinical Preventive Dentistry.

Meenu G Singla, Nikhil Relhan, Ishpreet Virdi

Department of Conservative Dentistry and Endodontics, Sudha Rustagi College of Dental Sciences and Research, Faridabad, India
Correspondence to: Meenu G Singla 
Department of Conservative Dentistry and Endodontics, Sudha Rustagi College of Dental Sciences and Research, Sector 89, Kheri More, Faridabad 121002, India. 
Tel: +91-9910308147, Fax: +91-0129-4230010, E-mail: meenu_sanjeevsingla@hotmail.com
https://orcid.org/0000-0002-7712-3506
Received May 23, 2018; Revised June 8, 2018; Accepted June 20, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Objective: The aim of this study was to evaluate the microhardness and depth of cure of three high viscosity bulk fill resin composites and to compare it with a conventional composite.
Methods: To evaluate depth of cure, the composite specimen was prepared using metallic mold with a hole of 4 mm depth and 4 mm internal diameter which was bulk filled with each of the three bulk fill composites (SonicFill, Filtek Bulk Fill Posterior & Beautifil Bulk Restorative) and light cured for 20 seconds. The conventional composite (Tetric N Ceram) was filled in the increments of 2-mm. The top and bottom surface hardness was measured using a Vickers microhardness indenter. The depth of cure was then calculated by dividing the bottom & top mean hardness values. 
Results: Sonicfill showed maximum surface microhardness followed by Beautifil Bulk restorative, Tetric N Ceram and Filtek Bulk Fill. Maximum depth of cure was seen in SonicFill followed by Filtek Bulk Fill, Tetric N Ceram and Beautifil Bulk restorative and the difference was statistically significant. SonicFill and Filtek Bulk Fill were able to achieve the minimum depth of cure value ≥0.80 at 4-mm depth. Beautiful bulk restorative composite was not able to achieve the minimum bottom to top ratio of 0.80.
Conclusion: Microhardness and depth of cure is a material specific property and factors such as composition; content and size of fillers; viscosity and translucency of the material play an important role in determining the properties of the bulk fill composite.
Keywords : high viscosity bulk-fill composites, giomers, depth of cure, Vickers microhardness
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June 2018, 14 (2)