Dayane Carvalho Ramos Salles de Oliveira1, Mateus Garcia Rocha2, Alexandre Gatti2, Americo Bortolazzo Correr2, Jack Liborio Ferracane3, Mario Alexandre Coelho Sinhoret2. 1. Department of Restorative Dentistry, School of Dentistry, Oregon Health & Sicence University, 2730 SW Moody Avenue, 97201, Portland, OR, USA; Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Av. Limeira, 901, Areião, 13414-903, Piracicaba, SP, Brazil. Electronic address: dayoli87@gmail.com. 2. Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Av. Limeira, 901, Areião, 13414-903, Piracicaba, SP, Brazil. 3. Department of Restorative Dentistry, School of Dentistry, Oregon Health & Sicence University, 2730 SW Moody Avenue, 97201, Portland, OR, USA.
Abstract
OBJECTIVES: To evaluate the effect of photoinitiators and reducing agents on cure efficiency and color stability of resin-based composites using different LED wavelengths. METHODS: Model resin-based composites were associated with diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide (TPO), phenylbis(2,4,6-trimethylbenzoyl) phosphine oxide (BAPO) or camphorquinone (CQ) associated with 2-(dimethylamino) ethyl methacrylate (DMAEMA), ethyl 4-(dimethyamino) benzoate (EDMAB) or 4-(N,N-dimethylamino) phenethyl alcohol (DMPOH). A narrow (Smartlite, Dentisply) and a broad spectrum (Bluephase G2, Ivoclar Vivadent) LEDs were used for photo-activation (20 J/cm(2)). Fourier transform infrared spectroscopy (FT-IR) was used to evaluate the cure efficiency for each composite, and CIELab parameters to evaluated color stability (ΔE00) after aging. The UV-vis absorption spectrophotometric analysis of each photoinitiator and reducing agent was determined. Data were analyzed using two-way ANOVA and Tukey's test for multiple comparisons (α=0.05). RESULTS: Higher cure efficiency was found for type-I photoinitiators photo-activated with a broad spectrum light, and for CQ-systems with a narrow band spectrum light, except when combined with an aliphatic amine (DMAEMA). Also, when combined with aromatic amines (EDMAB and DMPOH), similar cure efficiency with both wavelength LEDs was found. TPO had no cure efficiency when light-cured exclusively with a blue narrowband spectrum. CQ-systems presented higher color stability than type-I photoinitiators, especially when combined with DMPOH. CONCLUSIONS: After aging, CQ-based composites became more yellow and BAPO and TPO lighter and less yellow. However, CQ-systems presented higher color stability than type-I photoinitiators, as BAPO- and TPO-, despite their higher cure efficiency when photo-activated with corresponding wavelength range. CLINICAL SIGNIFICANCE: Color matching is initially important, but color change over time will be one of the major reasons for replacing esthetic restorations; despite the less yellowing of these alternative photoinitiators, camphorquinone presented higher color stability.
OBJECTIVES: To evaluate the effect of photoinitiators and reducing agents on cure efficiency and color stability of resin-based composites using different LED wavelengths. METHODS: Model resin-based composites were associated with diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide (TPO), phenylbis(2,4,6-trimethylbenzoyl) phosphine oxide (BAPO) or camphorquinone (CQ) associated with 2-(dimethylamino) ethyl methacrylate (DMAEMA), ethyl 4-(dimethyamino) benzoate (EDMAB) or 4-(N,N-dimethylamino) phenethyl alcohol (DMPOH). A narrow (Smartlite, Dentisply) and a broad spectrum (Bluephase G2, Ivoclar Vivadent) LEDs were used for photo-activation (20 J/cm(2)). Fourier transform infrared spectroscopy (FT-IR) was used to evaluate the cure efficiency for each composite, and CIELab parameters to evaluated color stability (ΔE00) after aging. The UV-vis absorption spectrophotometric analysis of each photoinitiator and reducing agent was determined. Data were analyzed using two-way ANOVA and Tukey's test for multiple comparisons (α=0.05). RESULTS: Higher cure efficiency was found for type-I photoinitiators photo-activated with a broad spectrum light, and for CQ-systems with a narrow band spectrum light, except when combined with an aliphatic amine (DMAEMA). Also, when combined with aromatic amines (EDMAB and DMPOH), similar cure efficiency with both wavelength LEDs was found. TPO had no cure efficiency when light-cured exclusively with a blue narrowband spectrum. CQ-systems presented higher color stability than type-I photoinitiators, especially when combined with DMPOH. CONCLUSIONS: After aging, CQ-based composites became more yellow and BAPO and TPO lighter and less yellow. However, CQ-systems presented higher color stability than type-I photoinitiators, as BAPO- and TPO-, despite their higher cure efficiency when photo-activated with corresponding wavelength range. CLINICAL SIGNIFICANCE: Color matching is initially important, but color change over time will be one of the major reasons for replacing esthetic restorations; despite the less yellowing of these alternative photoinitiators, camphorquinone presented higher color stability.
Authors: Dayane Carvalho Ramos Salles de Oliveira; Eduardo José Souza-Junior; Adam Dobson; Ana Rosa Costa Correr; William Cunha Brandt; Mário Alexandre Coelho Sinhoreti Journal: J Appl Oral Sci Date: 2016 Nov-Dec Impact factor: 2.698
Authors: Dayany da Silva Alves Maciel; Arnaldo Bonfim Caires-Filho; Marta Fernandez-Garcia; Camillo Anauate-Netto; Roberta Caroline Bruschi Alonso Journal: Biomed Res Int Date: 2018-05-22 Impact factor: 3.411
Authors: Carla Dos Reis Lima; Danilo Bandeira da Silva; Rafael Pino Vitti; Milton Edson Miranda; William Cunha Brandt Journal: Clin Cosmet Investig Dent Date: 2019-08-29
Authors: Katalin Bukovinszky; Melinda Szalóki; István Csarnovics; Attila Bonyár; Péter Petrik; Benjámin Kalas; Lajos Daróczi; Sándor Kéki; Sándor Kökényesi; Csaba Hegedűs Journal: Polymers (Basel) Date: 2021-01-15 Impact factor: 4.329