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CC BY-NC-ND 4.0 · Eur J Dent 2012; 06(04): 396-401
DOI: 10.1055/s-0039-1698978
Original Article
Dental Investigation Society

Does an additional UV LED improve the degree of conversion and Knoop Hardness of light-shade composite resins?

Maria Cecília Caldas Giorgi
1   University of Campinas
,
Flávio Henrique Baggio Aguiar
1   University of Campinas
,
Luís Luís Soares
2   Vale do Paraíba University
,
Airton Abrahão Martin
2   Vale do Paraíba University
,
Priscila Christiane Suzy Liporoni
3   Taubaté University University
,
Luís Alexandre Maffei Sartini Paulillo
1   University of Campinas
› Author Affiliations
Further Information

Publication History

Publication Date:
30 September 2019 (online)

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ABSTRACT

Objective: The purpose of this study was to evaluate the degree of conversion (DC) using FTRaman spectroscopy and the Knoop hardness (KHN) of composites cured by second and third-generation LED light curing-units (LCU), Radii Cal and Ultralume 5.

Methods: Three composites (Filtek Supreme XT, Filtek Z350, and Esthet X) were selected for this study. KHN testing (n=10) was performed with 10 indentations for the top (T) and bottom (B) surfaces. For DC (n=10), both the T and B surfaces were analyzed.

Results: For KHN, the three composites differed in hardens. There was a “LCU-surface” interaction, in which Radii Cal showed significantly greater hardens in the B surface. For DC, there was a “composite-surface-LCU” interaction. For the “composite” factor, there was no significant difference between the groups, except for Supreme XT-Radii Cal (T or B surfaces). For the “LCU” factor there was a significant difference for Supreme XT T surface, Ultralume 5 obtained a higher DC. For the Z350 T surface, a significant difference in the DC in which Radii Cal obtained better results. For the “surface” factor, all groups presented T surfaces with a higher DC than the B surfaces, the sole exceptions involved Esthet X-Radii Cal and Z350-Ultralume 5.

Conclusion: Knowledge regarding composite composition and the characteristics of LCUs are important for effective polymerization. (Eur J Dent 2012;6:396-401)

Key words

Composite resin - UV LED - degree of conversion
 

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