Assessment of influence of LED curing units used on microhardness of resin-modified glass ionomer sealants

Authors

DOI:

https://doi.org/10.20396/bjos.v21i00.8666202

Keywords:

Hardness, Pit and fissure sealants, Curing lights, dental

Abstract

Aim: Resin modified glass ionomer (RMGI) is class of material that can be used as sealant for preventing and arresting the progression of caries in pits and fissures. As these are hybrid materials, their properties can be affected by factors related to the polymerization process. Therefore, this study aimed to evaluate the influence of different generations of LED curing units (Elipar DeepCure-L and VALO Grand) on Knoop microhardness values (KHN) of RMGI sealants (Clinpro XT and Vitremer). Methods: Forty cylindrical specimens (6mm ø x 1 mm high) were prepared according to the manufacturer’s instructions and divided into four groups (n=10) according to the type of RMGI and LED used. The KHN of the top surface of each sample was calculated 7 days after light-curing. Data were submitted to two-way ANOVA (α = 0.05). Results: Vitremer had higher KHN values than Clinpro XT after using both LEDs (p<0.0001), but especially when light-cured with the use of VALO Grand (p<0.0001). Whereas the KHN value of Clinpro was not influenced by the LED device (p>0.05). Conclusions: Top surface microhardness values of RGMI sealants were affected by both material composition and generations of LED curing units used. Third generation LED curing units seemed to be more efficient for the polymerization of RMGI-based sealants.

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Author Biographies

Joyce Figueiredo de Lima Marques, University of Campinas

Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.

Laura Nobre Ferraz, University of Campinas

Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.

Beatriz Kelly Barros Lopes, Pontifical Catholic University of Minas Gerais

Department of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.

Tamires Aparecida Borges Vasconcelos, Pontifical Catholic University of Minas Gerais

Department of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.

Thiely Roberts Teixeira, Pontifical Catholic University of Minas Gerais

Department of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.

Débora Alves Nunes Leite Lima, University of Campinas

Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.

Flávio Henrique Baggio Aguiar, University of Campinas

Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.

Diogo de Azevedo Miranda, Pontifical Catholic University of Minas Gerais

Department of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.

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Published

2022-08-22

How to Cite

1.
Marques JF de L, Ferraz LN, Lopes BKB, Vasconcelos TAB, Teixeira TR, Lima DANL, Aguiar FHB, Miranda D de A. Assessment of influence of LED curing units used on microhardness of resin-modified glass ionomer sealants. Braz. J. Oral Sci. [Internet]. 2022 Aug. 22 [cited 2022 Dec. 7];21(00):e226202. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8666202

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