Surface microhardness of a thermoplasticized light-cured composite resin at different temperatures: in vitro

Authors

DOI:

https://doi.org/10.62428/rcvp2025411988

Keywords:

Composite resin, thermoplasticization, microhardness, photopolymerization

Abstract

The objective was to analyze the surface microhardness of a light-cured composite resin thermoplasticized at different temperatures in a high-altitude city. This was an in vitro experimental study using the nanofilled composite Filtek Z350XT (3M-ESPE), with a total of 40 specimens divided into 4 groups of 10 each. An AR Heater heating device was used. The device operated for 30 minutes to reach the planned temperatures of 40°C, 50°C, and 70°C; the resin syringe tube was placed in the device for 20 minutes to reach the programmed temperature. The syringe was then removed and the resin was immediately applied in a single increment into a custom-made mold. The samples were light-cured for 10 seconds using the Bluephase N lamp from Ivoclar-Vivadent, with a light intensity of 1200 mW/cm². It was found that Group 4 (70°C) showed statistically significant differences compared to Group 1, which was polymerized at room temperature (13°C), and also showed a significant difference compared to Group 2 (40°C). However, no significant difference was observed when compared to Group 3, which had been thermoplasticized at 50°C. The specimens thermoplasticized at 70°C (60.77 ± 5.65) exhibited significantly higher surface microhardness than those in Group 1 (53.09 ± 5.11) and Group 2 (53.62 ± 5.05), while no statistically significant difference was observed compared to Group 3 (55.76 ± 4.51).

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Published

2025-06-27

How to Cite

Solís Condor, G. (2025). Surface microhardness of a thermoplasticized light-cured composite resin at different temperatures: in vitro. Cátedra Villarreal Posgrado, 4(1), 55–64. https://doi.org/10.62428/rcvp2025411988

Issue

Vol. 4 No. 1 (2025): Cátedra Villarreal Posgrado

Section

Artículos originales

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Copyright (c) 2025 Gilmer Solís Condor

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