Color stability of an artificially aged nanofilled composite resin post-cured with different techniques

Souza, Lais Sampaio; Donato, Tais Rocha; Cerqueira, Gabriela Alves de; Cavalcanti, Andréa Nóbrega; Mathias, Paula

doi:10.34172/joddd.2021.010

Cited by 3 publications

(2 citation statements)

References 23 publications

(12 reference statements)

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“…Color change or variation is one of the main reasons for the replacement of restorations, especially in anterior teeth [ 9 , 17 , 19 ]. The discoloration of resin composites has a multifactorial etiology, with chlorhexidine-based mouthwashes being one of the causative factors [ 2 , 6 , 9 ].…”

Section: Discussionmentioning

confidence: 99%

“…This possibly suggests that the use of mouthwashes for more than one week may alter the shade stability of conventional nanohybrid resin composites. The literature establishes a clinically acceptable value of ΔE ≤ 3.3 [ 5 , 8 , 19 , 22 ]. Therefore, in the present study, the color variations of the submerged resin composites between 7 and 14 days, with and without polishing, were considered clinically acceptable, while, at 21 and 28 days, they presented significant color variation in most groups.…”

Section: Discussionmentioning

confidence: 99%

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In Vitro Color Stability Evaluation of Three Polished and Unpolished Nanohybrid Resin Composites Immersed in a 0.12% Chlorhexidine-Based Mouthwash at Different Times

et al. 2023

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The use of chlorhexidine-based mouthwashes on resin composites with rough surfaces can cause discoloration which compromises the esthetic of patients. The present study aimed to evaluate the in vitro color stability of Forma (Ultradent Products, Inc., South Jordan), Tetric N-Ceram (Ivoclar Vivadent, Schaan, Liechtenstein) and Filtek Z350XT (3M, ESPE, St. Paul, MN, USA) resin composites, with and without polishing, after being immersed in a 0.12% chlorhexidine (CHX)-based mouthwash at different times. The present in vitro experimental and longitudinal study used 96 nanohybrid resin composite blocks (Forma, Tetric N-Ceram and Filtek Z350XT) 8 mm in diameter and 2 mm thick, evenly distributed. Each resin composite group was divided into two subgroups (n = 16) with and without polishing and then immersed in a 0.12% CHX-based mouthwash for 7, 14, 21 and 28 days. Color measurements were performed with a calibrated digital spectrophotometer. Nonparametric tests were used to compare independent (Mann–Whitney U and Kruskal–Wallis) and related (Friedman) measures. In addition, the Bonferroni post hoc correction was used considering a significance level of p < 0.05. All polished and unpolished resin composites presented color variation < 3.3 when immersed for up to 14 days in 0.12% CHX-based mouthwash. The polished resin composite with the lowest color variation (ΔE) values over time was Forma, and the one with the highest values was Tetric N-Ceram. When comparing the color variation (ΔE) over time, it was observed that the three resin composites, with and without polishing, presented a significant change (p < 0.001), although these changes in color variation (ΔE) were evident from 14 days between each color acquisition (p < 0.05). The unpolished Forma and Filtek Z350XT resin composites showed significantly more color variation than the same polished ones at all times when immersed in a 0.12% CHX-based mouthwash for 30 s daily. In addition, every 14 days, all three resin composites with and without polishing showed a significant color change, while, every 7 days, color stability was maintained. All the resin composites showed clinically acceptable color stability when exposed for up to 14 days to the above-mentioned mouthwash.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

In Vitro Color Stability Evaluation of Three Polished and Unpolished Nanohybrid Resin Composites Immersed in a 0.12% Chlorhexidine-Based Mouthwash at Different Times

et al. 2023

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Effect of Using Manufacturer-recommended Exposure Times to Photo-activate Bulk-fill and Conventional Resin-based Composites

Barcelos

Braga

Pereira

et al. 2023

Operative Dentistry

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SUMMARY Objectives To analyze the effect of using the resin-based composite manufacturer’s recommended exposure time on the degree of conversion (DC), Knoop hardness (KH), and elastic modulus (E) of conventional and bulk-fill resin-based composites (RBCs). Methods Three resin-based composites (RBCs) were tested: Tetric EvoCeram Bulk Fill (TET), Opus Bulk Fill APS (OPU), and RBC Vittra APS (VIT). They were photo-activated in 2 mm deep, 6 mm diameter molds for their recommended exposure times of 10 seconds, 20 seconds, or 40 seconds from four light-curing units (LCUs). Two delivered a single emission peak in the blue light region (Optilight Max and Radii-Cal) and two delivered multiple emission peaks in the violet and blue region (VALO Cordless and Bluephase G2). After 24 hours of dry storage at 37°C in the dark, the KH (Kgf/mm2), E (MPa) and DC (%) at the top and bottom surfaces of specimens (n=5) were measured and the results analyzed by 2-way analysis of variance (ANOVA) followed by a Tukey test (α=0.05). Results The irradiance (mW/cm2) and spectral irradiance (mW/cm2/nm) from the LCUs were reduced significantly (8–35%) after passing through 2.0 mm of RBC (p<0.001). The DC at the bottom of VIT and TET was less than at the top surface (p<0.001). OPU had the same DC at the top and bottom surface (p=0.341). The KH and E values at the top surface of VIT and TET were substantially higher than at the bottom (p<0.001). OPU exposed for 40 seconds achieved higher mechanical properties than TET that was photo-activated for 10 seconds (p<0.001). The opacity of different bulk-fill RBCs changed differently during the polymerization; OPU became more opaque, whereas TET became more transparent. When exposed for their recommended times, the 2 mm thick RBCs that used Ivocerin or the APS photoinitiator system were adequately photo-activated using either the single or multiple emission peak LCUs (p=0.341). Conclusion After 24 hours’ storage, all the 2 mm thick RBCs photo-cured in 6 mm diameter molds achieved a bottom-to-top hardness ratio of at least 80% when their recommended exposure times were used. TET, when photo-activated for 10 seconds, achieved lower mechanical properties than OPU that had been photo-activated for 40 seconds. The change in opacity of the RBCs was different during photo-activation.

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Reabilitação estética de dente conóide: relato de caso

Santos,

Melo,

Moya

et al. 2024

RCO

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As aesthetics advance in modern dentistry, people's expectations of their smiles become ever higher. Microdontia or conoid tooth, which refers to teeth smaller than normal, is one of the abnormalities that causes major aesthetic complaints due to its characteristics. Conoid teeth have a prevalence of 0.6 to 9.9%, with conical upper lateral teeth affecting approximately 55,000 people, with women being more susceptible than men. Many factors must be considered when restoring anterior teeth, depending on patient expectations and dental practice. The direct composite resin technique has stood out for providing aesthetic benefits, preserving tooth structure, being performed in a single consultation, being cheaper and not requiring any laboratory process. The objective of this study was to report a clinical case of aesthetic rehabilitation in a conoid tooth in the upper left lateral incisor with composite resin restoration using the direct technique. Clinical planning is essential for choosing the technique and restorative material to be used. Despite the various techniques proposed for the treatment of conoid lateral incisors, the aesthetic reanatomization with a direct veneer of composite resin, with diagnostic waxing, used in this study, was effective and inexpensive, allowing a minimally invasive treatment and possible posterior adjustments, enabling the restoration of self-esteem and the harmony of the patient's smile.

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Color stability of an artificially aged nanofilled composite resin post-cured with different techniques

Cited by 3 publications

References 23 publications

In Vitro Color Stability Evaluation of Three Polished and Unpolished Nanohybrid Resin Composites Immersed in a 0.12% Chlorhexidine-Based Mouthwash at Different Times

In Vitro Color Stability Evaluation of Three Polished and Unpolished Nanohybrid Resin Composites Immersed in a 0.12% Chlorhexidine-Based Mouthwash at Different Times

Effect of Using Manufacturer-recommended Exposure Times to Photo-activate Bulk-fill and Conventional Resin-based Composites

Reabilitação estética de dente conóide: relato de caso

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