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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Lara, Lucas [1] ; Rocha, Mateus Garcia [2] ; de Menezes, Livia Rodrigues [2] ; Correr, Americo Bortolazzo [1] ; Coelho Sinhoreti, Mario Alexandre [1] ; Oliveira, Dayane [3]
Total Authors: 6
Affiliation:
[1] Univ Estadual Campinas UNICAMP, Dept Odontol Restauradora, Fac Odontol Piracicaba, Piracicaba, SP - Brazil
[2] Univ Fed Rio de Janeiro, Inst Macromol Prof Eloise Mano, Rio De Janeiro, RJ - Brazil
[3] Univ Florida, Div Operat Dent, Dept Restorat Dent Sci, Gainesville, FL 32610 - USA
Total Affiliations: 3
Document type: Journal article
Source: Journal of Applied Oral Science; v. 29, p. 1-9, 2021.
Web of Science Citations: 0
Abstract

Abstract 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. (AU)

FAPESP's process: 17/22161-7 - Development and characterization of dental resin materials photoactivated under WAVELENGHS between 495 and 750 nm
Grantee:Dayane Carvalho Ramos Salles de Oliveira
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 17/22195-9 - Development and characterization of bulk fill composites light cured using silver nanoparticles surface plasmon resonance as a photoinitiator system
Grantee:Mateus Garcia Rocha
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 16/06019-3 - PHYSICOCHEMICAL PROPERTIES AND WEAR RESISTANCE OF COMMERCIAL AND EXPERIMENTAL BULKFILL DENTAL COMPOSITES BASED ON ELASTOMERIC MONOMER
Grantee:Mateus Garcia Rocha
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 16/05823-3 - LOW INTENSITY LIGHT-CURING UNITS AND PHOTOINITIATION SYSTEMS ACTIVATED UNDER WAVELENGHS IN BETWEEN 495-750 NM FOR DENTAL RESIN MATERIALS
Grantee:Dayane Carvalho Ramos Salles de Oliveira
Support Opportunities: Scholarships in Brazil - Post-Doctoral