The effect of different light curing units on Vickers microhardness and degree of conversion of flowable resin composites

Swe Zin AUNG; Tomohiro TAKAGAKI; Masaomi IKEDA; Kosuke NOZAKI; Michael F. BURROW; Ahmed ABDOU; Toru NIKAIDO; Junji TAGAMI

doi:10.4012/dmj.2019-353

Original Paper

The effect of different light curing units on Vickers microhardness and degree of conversion of flowable resin composites

Swe Zin AUNG, Tomohiro TAKAGAKI, Masaomi IKEDA, Kosuke NOZAKI, Michael F. BURROW, Ahmed ABDOU, Toru NIKAIDO, Junji TAGAMI

Author information

Swe Zin AUNG
Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
Tomohiro TAKAGAKI
Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
Department of Operative Dentistry, Division of Oral Functional Sciences and Rehabilitation, School of Dentistry, Asahi University
Masaomi IKEDA
Oral Prosthetic Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
Kosuke NOZAKI
Department of Biofunction Research, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental Universit
Michael F. BURROW
Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital
Ahmed ABDOU
Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
Toru NIKAIDO
Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
Department of Operative Dentistry, Division of Oral Functional Sciences and Rehabilitation, School of Dentistry, Asahi University
Junji TAGAMI
Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University

Keywords: Light curing units, Flowable resin composites, Vickers microhardness, Degree of conversion, Polymerization efficacy

JOURNAL FREE ACCESS

2021 Volume 40 Issue 1 Pages 44-51

DOI https://doi.org/10.4012/dmj.2019-353

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Abstract

This study aimed to assess the influence of different light curing units (LCUs) on the polymerization of various flowable resin composites. Three LCUs (Optilux 501, Elipar™ DeepCure-L LED and Bluephase^®20i) and eight flowable resin composites: MI FIL Flow, Estelite Flow Quick, Estelite Universal Flow (medium), Estelite Universal Flow (super low), Beautifil Flow Plus, Clearfil Majesty ES Flow, Filtek Supreme Ultra flowable and TetricEvo Flow were tested. For Vickers microhardness (VHN) test and degree of conversion (DC), specimens were prepared and polymerized for 20 s. VHN test was performed at top surfaces (3 indentations) and DC for each specimen was measured using Fourier transform infrared (FT-IR) spectroscopy after 24 h dry storage in dark at 37˚C. The data were analyzed with 2-way ANOVA and t-test with Bonferroni correction. DC and hardness values showed a relationship between materials and LCUs. The curing efficacy of LCU type may depend on the material composition.

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