OBJECTIVES: To evaluate the color stability (ΔE) of experimental composites containing different photoinitiators when submitted to accelerated artificial ageing (AAA). MATERIAL AND METHODS: Thirty test specimens were made in a Teflon matrix (8mm×2mm), using an experimental composite (n=10) with the same monomer composition and particle size, but varying photoinitiator used: Group CQ (0.4% Camphorquinone), Group PPD (0.4% 1-Phenyl-1,2 Propanodione) and Group CQ+PPD (0.2% CQ+0.2% PPD). The samples were light activated (QTH - Ultralux - Dabi Atlante - 40s) and polished before performing the initial color readouts (EasyShade - Vita). Next, they were submitted to AAA for 300h, after which final color readouts were made. RESULTS: The results (1-way ANOVA - Tukey - p<0.05) demonstrated that all the groups presented color alteration above the clinically acceptable level (ΔE≥3.3), however, with no statistically significant difference among them (p>0.05). Analysis of Δb demonstrated increase in the values of this coordinate, indicating yellowing in all groups. CONCLUSIONS: It was concluded that the type of photoinitiator, which presented a tendency towards yellowing, did not interfere in the color stability of composites submitted to AAA. CLINICAL SIGNIFICANCE: Alternative photoinitiators have been extensively studied since Camphorquinone presents a yellowish color, which compromises the aesthetic performance of composites, especially the lighter-shade ones.
OBJECTIVES: To evaluate the color stability (ΔE) of experimental composites containing different photoinitiators when submitted to accelerated artificial ageing (AAA). MATERIAL AND METHODS: Thirty test specimens were made in a Teflon matrix (8mm×2mm), using an experimental composite (n=10) with the same monomer composition and particle size, but varying photoinitiator used: Group CQ (0.4% Camphorquinone), Group PPD (0.4% 1-Phenyl-1,2 Propanodione) and Group CQ+PPD (0.2% CQ+0.2% PPD). The samples were light activated (QTH - Ultralux - Dabi Atlante - 40s) and polished before performing the initial color readouts (EasyShade - Vita). Next, they were submitted to AAA for 300h, after which final color readouts were made. RESULTS: The results (1-way ANOVA - Tukey - p<0.05) demonstrated that all the groups presented color alteration above the clinically acceptable level (ΔE≥3.3), however, with no statistically significant difference among them (p>0.05). Analysis of Δb demonstrated increase in the values of this coordinate, indicating yellowing in all groups. CONCLUSIONS: It was concluded that the type of photoinitiator, which presented a tendency towards yellowing, did not interfere in the color stability of composites submitted to AAA. CLINICAL SIGNIFICANCE: Alternative photoinitiators have been extensively studied since Camphorquinone presents a yellowish color, which compromises the aesthetic performance of composites, especially the lighter-shade ones.
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: 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: Luis Felipe Marques de Resende; Anderson Catelan; Kusai Baroudi; Alan Rodrigo Muniz Palialol; Alexandre Marques de Resende; Ana Carolina Andreucci; Rayssa Ferreira Zanatta; Priscila Christiane Suzy Liporoni Journal: Eur J Dent Date: 2021-08-24