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Revista Estomatológica Herediana
versión impresa ISSN 1019-4355
Resumen
VASQUEZ-CASTRO, Eva et al. Evaluation of the exposure time of a Bulk-Fill resin in deep preparations. Rev. Estomatol. Herediana [online]. 2022, vol.32, n.1, pp.30-35. Epub 22-Abr-2022. ISSN 1019-4355. http://dx.doi.org/10.20453/reh.v32i1.4180.
Background:
Bulk-fill composite resins (BF) are used in posterior restorations with extensive and deep preparations. One of the most outstanding benefits is that it can be used in increments of 4 to 5 mm, reducing clinical working time. However, in teeth with root canal treatment, these preparations could be deeper.
Objectives:
To determine the photoactivation time necessary to polymerize a Bulk-Fill resin located in deep areas.
Material and Methods:
In the present experimental in vitro study, specimens of Filtek One Bulk Fill composite resin (3M ESPE, St. Paul, USA) of 5x5x5 mm color A2 photoactivated at a distance/time of 0 mm/10 s, 0 mm/20 s, 3 mm/10 s, 3 mm/20 s, 3 mm/30 s and 3 mm/40 s (n=5) were fabricated. Surface microhardness was recorded on the surface and at the base of each specimen.
Results:
The highest microhardness value was recorded in group BF 0 mm/20 s and BF 3 mm/40 s (p<0.05), followed by groups BF 3 mm/20 s and BF 3 mm/30 s (p>0.05). The lowest microhardness values were found in the BF 0 mm/10 s and BF 3 mm/10 s groups.
Conclusion:
It takes 40 s of photoactivation to polymerize a Bulk-Fill resin located in deep areas, when the lamp is 3 mm away from the resin surface.
Palabras clave : Hardness; time; composite resins; polymerization.