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Effect of combining photoinitiators on cure efficiency of dental resin-based composites

Camphorquinone is the most conventionally used photoinitiator in Dentistry. Although different alternative photoinitiators have been proposed, no photoinitiator was capable of completely substituting camphorquinone. The combination of photoinitiators has been considered the best alternative. OBJECTI...

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Autores principales: Lara, Lucas, Rocha, Mateus Garcia, de Menezes, Livia Rodrigues, Correr, Américo Bortolazzo, Sinhoreti, Mario Alexandre Coelho, Oliveira, Dayane
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Faculdade De Odontologia De Bauru - USP 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8315791/
https://www.ncbi.nlm.nih.gov/pubmed/34320117
http://dx.doi.org/10.1590/1678-7757-2020-0467
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author Lara, Lucas
Rocha, Mateus Garcia
de Menezes, Livia Rodrigues
Correr, Américo Bortolazzo
Sinhoreti, Mario Alexandre Coelho
Oliveira, Dayane
author_facet Lara, Lucas
Rocha, Mateus Garcia
de Menezes, Livia Rodrigues
Correr, Américo Bortolazzo
Sinhoreti, Mario Alexandre Coelho
Oliveira, Dayane
author_sort Lara, Lucas
collection PubMed
description Camphorquinone is the most conventionally used photoinitiator in Dentistry. Although different alternative photoinitiators have been proposed, no photoinitiator was capable of completely substituting camphorquinone. The combination of photoinitiators has been considered the best alternative. OBJECTIVES: To evaluate the effect of combining Norrish type I and II photoinitiators on the cure efficiency of dental resin-based composites. METHODOLOGY: Experimental composites were produced containing different photoinitiator systems: Norrish type I-only, mono-alkyl phosphine oxide (TPO); Norrish type II-only, camphorquinone (CQ); or its combination, CQ and TPO, in a 1: 1 molar ratio. UV-vis absorption spectrophotometry was performed to assess the consumption of each photoinitiator after curing (n=3). A multi-wave LED (Bluephase(®) G2, Ivoclar Vivadent) was pre-characterized and used with a radiant exposure of 24 J/cm2. The degree of conversion was evaluated by Raman spectrometry, and the elution of the monomers by nuclear magnetic resonance analysis (n=3). Data were analyzed using ANOVA and Tukey's test (α=0.05; β=0.2). RESULTS: The combination of CQ and TPO increased the consumption of the photoinitiator system compared to CQ-only (p=0.001), but presented similar consumption compared to TPO-only (p=0.52). There was no significant difference in the degree of conversion between the composites regardless of the photoinitiator system (p=0.81). However, the elution of the monomers was reduced when both photoinitiators were combined. TPO-based material presented the highest elution of monomers. CONCLUSIONS: The combination of the photoinitiator systems seems to be beneficial for the cure efficiency of dental resin-based composites.
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spelling pubmed-83157912021-07-29 Effect of combining photoinitiators on cure efficiency of dental resin-based composites Lara, Lucas Rocha, Mateus Garcia de Menezes, Livia Rodrigues Correr, Américo Bortolazzo Sinhoreti, Mario Alexandre Coelho Oliveira, Dayane J Appl Oral Sci Original Article Camphorquinone is the most conventionally used photoinitiator in Dentistry. Although different alternative photoinitiators have been proposed, no photoinitiator was capable of completely substituting camphorquinone. The combination of photoinitiators has been considered the best alternative. OBJECTIVES: To evaluate the effect of combining Norrish type I and II photoinitiators on the cure efficiency of dental resin-based composites. METHODOLOGY: Experimental composites were produced containing different photoinitiator systems: Norrish type I-only, mono-alkyl phosphine oxide (TPO); Norrish type II-only, camphorquinone (CQ); or its combination, CQ and TPO, in a 1: 1 molar ratio. UV-vis absorption spectrophotometry was performed to assess the consumption of each photoinitiator after curing (n=3). A multi-wave LED (Bluephase(®) G2, Ivoclar Vivadent) was pre-characterized and used with a radiant exposure of 24 J/cm2. The degree of conversion was evaluated by Raman spectrometry, and the elution of the monomers by nuclear magnetic resonance analysis (n=3). Data were analyzed using ANOVA and Tukey's test (α=0.05; β=0.2). RESULTS: The combination of CQ and TPO increased the consumption of the photoinitiator system compared to CQ-only (p=0.001), but presented similar consumption compared to TPO-only (p=0.52). There was no significant difference in the degree of conversion between the composites regardless of the photoinitiator system (p=0.81). However, the elution of the monomers was reduced when both photoinitiators were combined. TPO-based material presented the highest elution of monomers. CONCLUSIONS: The combination of the photoinitiator systems seems to be beneficial for the cure efficiency of dental resin-based composites. Faculdade De Odontologia De Bauru - USP 2021-07-23 /pmc/articles/PMC8315791/ /pubmed/34320117 http://dx.doi.org/10.1590/1678-7757-2020-0467 Text en https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Lara, Lucas
Rocha, Mateus Garcia
de Menezes, Livia Rodrigues
Correr, Américo Bortolazzo
Sinhoreti, Mario Alexandre Coelho
Oliveira, Dayane
Effect of combining photoinitiators on cure efficiency of dental resin-based composites
title Effect of combining photoinitiators on cure efficiency of dental resin-based composites
title_full Effect of combining photoinitiators on cure efficiency of dental resin-based composites
title_fullStr Effect of combining photoinitiators on cure efficiency of dental resin-based composites
title_full_unstemmed Effect of combining photoinitiators on cure efficiency of dental resin-based composites
title_short Effect of combining photoinitiators on cure efficiency of dental resin-based composites
title_sort effect of combining photoinitiators on cure efficiency of dental resin-based composites
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8315791/
https://www.ncbi.nlm.nih.gov/pubmed/34320117
http://dx.doi.org/10.1590/1678-7757-2020-0467
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