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J Conserv Dent. 2019 Jul-Aug;22(4):371-375. doi: 10.4103/JCD.JCD_453_18.

The comparative evaluation of depth of cure of bulk-fill composites - An in vitro study.

Author information

1
Department of Conservative Dentistry and Endodontics, Himachal Institute of Dental Sciences, Paonta Sahib, HP, India.

Abstract

Introduction:

Resin-based composites (RBCs), as restorative dental materials, have given a new dimension to conservative and esthetic dentistry. The objective of the present study is to evaluate and compare the depth of cure of RBC's for posterior use: Sculptable bulk-fill composite - Tetric N-Ceram bulk fill (TNCBF), Flowable bulk-fill composites-TetricEvoflow bulk fill (TEFBF), Surefil SDR bulk fill (SDRBF), Dual cure bulk fill-Fill-Up (FDCBF) with conventional RBC-Esthet-X flow (EXF) and Filtex Z250 (FZ).

Materials and Methods:

A standardized polyacrylic mold was bulk filled with each of the six composites and light-cured for 20 s, followed by 24 h storage in water. The surface hardness was measured on the top and the bottom by recording Vickers hardness number by Vickers hardness indenter.

Results:

The mean bottom surface hardness value (HV) of SDR and TEFBF exceeded 80% of the top surface HV (HV-80%). Low viscosity bulk-fill composites (SDR and Tetric Evoflow) were properly cured in 4-mm increments. The TNCBF, high-viscosity composite, and Fill-Up, dual-cure bulk fill were not sufficiently cured in 4-mm increments.

Conclusion:

With increase in incremental thickness, HV decreased for the conventional resin composite but generally remained constant for the bulk-fill resin composites.

KEYWORDS:

Bulk-fill composites; depth of cure; dual-cure; flowable; microhardness; packable

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