Publication: Polymerization characteristics of colored compomers cured with different LED units
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Date
2019-02-01
Authors
Authors
Durmus, ZEHRA
Yilmaz, BERZA
Bakkal, MELTEM
Durmus, Ali
Ozalp, Serife
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Abstract
Aim: Incomplete polymerization of a resin material used for dental restoration affects the properties of the restoration.
We evaluated the structural and mechanical properties of three different colored compomers cured with three different
LED units to observe the characteristic changes occurring in different matches.
Methods: Polytetrafluoroethylene molds (5 mm in diameter and 2 mm in thickness) were used to prepare disk-shaped
sample specimens. Nine sample groups (each of five specimens) were prepared, three each of different compomer resin
colors (gold, berry, and silver). Samples were cured using three different LED units (Optima, VALO, and Demi Ultra),
according to the manufacturers’ instructions. Microstructural properties of samples were characterized by determining
the degree of curing using Fourier-transform infrared spectroscopy and by analyzing sample morphology under a scanning
electron microscope. The Vickers hardness, compressive strength, and elastic modulus of the samples were measured to
investigate their mechanical properties.
Results: The degrees of curing decreased in the order of silver > berry > gold for all curing units. Conversely, gold
compomers exhibited poorer mechanical values than the berry and silver counterparts. The Optima 10 unit yielded
slightly higher degrees of curing than the other devices, followed by Demi Ultra and VALO light-curing units, respectively.
Conclusion: The resin color affected the structural and mechanical properties of the compomers, possibly as a result
of the complex interactions and relationships between the irradiation light and resin material, such as light absorbance
and reflectance; thus, depending on the color as well as the curing protocol.
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Citation
Bakkal M., Yilmaz B., Durmus A., Durmus Z., Ozalp S., -Polymerization characteristics of colored compomers cured with different LED units-, JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS, cilt.17, 2019