Influence of different photoinitiators on polymerization kinetics and marginal microleakage in restorations using photopolymerizable dental composites
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Universidade Federal de Minas Gerais
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Objective: To evaluate the influence of four different photoinitiators on the
polymerization kinetics and marginal microleakage in class V restorations using
photopolymerizable dental composites. Material and Methods: Four
photopolymerizable dental composites based on Bis-GMA (14.5 wt %), UDMA (6.5 wt
%) and silanized filler particles (79 wt %) containing different photoinitiators were
formulated. Camphorquinone (CQ)/amine, phenyl-propanedione (PPD),
monoacylphosphine oxide (Lucirin® TPO) and bisacylphosphine oxide (Irgacure® 819)
were used as photoinitiators. Sixteen intact human third molars were selected and
divided into four groups. All teeth received class V cavity preparations in their buccal
and lingual surfaces and were submitted to a dye leakage test. Data were independently
analyzed for both enamel and dentin, and the results were assessed by a Kruskal-Walis
test. The polymerization reactions of the four composites were evaluated by differential
scanning calorimeter coupled with photocalorimeter accessory. Results: Lucirin® TPO
presented the highest scores for microleakage in enamel, whereas the other
photoinitiators have not demonstrated statistical differences. The lowest scores were
obtained for PPD in dentin while the highest scores have been achieved by Irgacure®
819 and Lucirin® TPO. Photocalorimetric measurements demonstrated a correlation
between polymerization reaction rate and marginal leakage, showing that faster
reactions cause greater marginal leakage. Conclusion: Marginal microleakage scores in
photopolymerizable dental composites can be greatly influenced by different types of
photoinitiators through their distinct reaction rates
Abstract
Assunto
Photoinitiators dental, Tooth, Composite resins, Dental leakage
Palavras-chave
Photoinitiators, Dental, Composite resins, Dental leakage.
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https://www.redalyc.org/articulo.oa?id=63749543027