Effect of extended light activation and increment thickness on physical properties of conventional and bulk-filled resin-based composites

Mendonça, Beatriz Curvello de; Soto‐Montero, Jorge; Castro, Eduardo Fernandes de; Kury, Matheus; Cavalli, Vanessa; Giannini, Marcelo

doi:10.1007/s00784-021-04296-7

Cited by 12 publications

(6 citation statements)

References 45 publications

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“…In addition, all tested composites showed low mean MH values on the bottom compared with top surfaces, particularly following 20 seconds photopolymerization (MH range, 11.4-47.5). This observation is consistent with the results of de Mendonça et al study [25]. The low MH values noted in the present work can be attributed to the low DC values.…”

Section: Discussionsupporting

confidence: 94%

Do high-viscosity bulk-fill composites polymerize sufficiently at deep layers?

Albaaj¹,

Alshalal²,

Gholam³

2023

jos

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Introduction: High-viscosity bulk-fill composites may polymerize insufficiently at deep layers after a short curing time. Objectives: This in-vitro study aimed to estimate and compare the degree of conversion (DC) and micro-hardness (MH), following 20 and 40 seconds photopolymerization of three high-viscosity bulk-fill composites at 2-4 mm depth. Material and methods: Three new brands of bulk-fill dental composites were selected for this study, including Beautifil-Bulk (Shofu Inc., Kyoto, Japan), Tetric N-Ceram Bulk Fill (Ivoclar Vivadent AG, Schaan, Liechtenstein), and Opus Bulk Fill (FGM, Joinville, SC, Brazil). For each composite, six disc samples located at a 2-4 mm depth were prepared via photopolymerization for 20 (n = 3) or 40 (n = 3) seconds. Each sample was 2 mm thick and 8 mm wide. Following one-hour post-cure, DC and MH assessments were applied using Fourier transform infrared spectroscopy (FTIR) and Vickers MH devices. Data were analyzed using parametric ANOVA and LSD tests. Results: Values of DC and MH were higher following 40 seconds compared with 20 seconds photopolymerization. However, none of the composites reached the minimum accepted DC (≥ 55%). For both curing times, Tetric N-Ceram showed the highest DC% (42%, 51%), while Beautifil-Bulk had the highest MH values for top (58.2 ± 0.5, 60.0 ± 1.5) and bottom (47.5 ± 3.1, 53.5 ± 1.0) surfaces. Conclusions: At a 2-4 mm depth and one-hour post-cure, bulk-fill composites showed insufficient DC and low MH values when photopolymerized for 20 or 40 seconds. The extension of curing time to 40 seconds improved the DC and MH values.

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Section: Discussionsupporting

confidence: 94%

Do high-viscosity bulk-fill composites polymerize sufficiently at deep layers?

Albaaj¹,

Alshalal²,

Gholam³

2023

jos

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“…Every manufacturer states their recommendations for light-curing times and radiant exitance. However, many studies have demonstrated improved mechanical properties after extended curing [ 3 , 29 , 30 , 31 ]. Such prolonged illumination with overlapping light exposures from both sides of a 2 mm thick specimen is stipulated by the ISO 4049 regulations to test flexural strength.…”

Section: Introductionmentioning

confidence: 99%

Aging-Dependent Changes in Mechanical Properties of the New Generation of Bulk-Fill Composites

et al. 2022

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This study evaluated the behavior of a new generation of bulk-fill resin composites after prolonged exposure to an aqueous environment and accelerated aging in ethanol. Six bulk-fill materials were tested (Tetric PowerFill, Filtek One Bulk Fill Restorative, Tetric EvoCeram Bulk Fill, Fill-Up!, Tetric PowerFlow, SDR Plus Bulk Fill Flowable) and compared to two conventional reference materials (Tetric EvoCeram and Tetric EvoFlow). Flexural strength, modulus, and Weibull parameters were examined at three time points: 1 day, 30 days, and 30 days followed by ethanol immersion. Degree of conversion after 30 days, water sorption, and solubility up to 90 days were also investigated. Filtek One Bulk Fill had the highest flexural strength and modulus among the tested materials, followed by Tetric PowerFill and SDR plus. Flexural strength and modulus of high-viscosity bulk-fill materials showed higher stability after accelerated aging in ethanol compared to their low-viscosity counterparts and reference materials. After 30 days, the degree of conversion was above 80% for all tested materials. Dual-cure material Fill-Up! was the best-cured material. The water sorption was highest for Fill-Up!, Filtek One Bulk Fill Restorative, and Tetric EvoFlow, while solubility was highest for Tetric EvoCeram. After aging in water and ethanol, new generation high-viscosity bulk-fill materials showed better mechanical properties than low-viscosity bulk-fill and conventional composites under extended light curing conditions.

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“…Furthermore, patients’ postoperative discomfort would not be affected adversely by using bulk-fill RC for restoring dental cavities [ 19 , 20 ]. On the other hand, some literature had found that bulk-fill technique has many concerns regarding the degree of conversion, aesthetics, mechanical properties and even polymerization shrinkage [ 21 , 22 ]. In addition, the less satisfying handling properties encountered by operators compared to conventional RC.…”

Section: Introductionmentioning

confidence: 99%

Impact of repeated preheating of bulk-fill resin composite on postoperative hypersensitivity; a randomized controlled clinical trial

Elkady,

Abdelhakim,

Riad

2024

BMC Oral Health

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Background This clinical study was conducted aiming to evaluate the impact of repeated preheating of bulk-fill resin composite on postoperative hypersensitivity. Methods A total of 105 eligible, consenting adults were recruited. Patients had posterior teeth suffering from proximal decay with no signs of irreversible pulpitis. Patients were prepared for Class II restorations and restored with bulk-fill resin composite. Patients were randomized into three groups of 35 patients according to the number of preheating cycles for the resin composite syringe used; group I: no preheating; control group at room temperature, group II: Resin composite preheated once, and group III: Resin composite preheated ten cycles. Patients were assessed for postoperative dentin hypersensitivity using the visual analogue scale (VAS) at three-time intervals: day one, one week and by the end of one month after restorative treatment. Statistical analysis was performed; ANOVA with a single factor was used to test for significance at a p value ≤ 0.05. For nonparametric data, the Kruskal‒Wallis test was used to compare the three testing groups. Friedman’s test was used to study the changes within each group. Dunn’s test was used for pairwise comparisons when the Kruskal‒Wallis test or Friedman’s test was significant. Results The scores of the three groups through the three time intervals were almost zero except for the first day where VAS scores were recorded with maximum score of 3 for groups I and II. Groups II and III; there was no statistically significant change in hypersensitivity scores by time with P-values 0.135 and 0.368, respectively. However, for group I there was a significant difference from VAS score recorded on first day and the two following time intervals. Conclusion The repeated preheating cycles of bulk-fill resin composite prior to curing had no adverse effect on the patients regarding postoperative dentin hypersensitivity. This information could be of utmost significance, as the same resin composite syringe can undergo numerous preheating cycles clinically before it is completely consumed with the advantage of improvement on the handling properties. Trial registration The protocol of the current study was registered at www.clinicaltrials.gov, with the identification number NCT05289479 on 21/03/2022. All procedures involving human participants were performed in accordance with the ethical standards of the Research Ethics Committee of the Faculty of Dentistry, Minia University, Egypt, under the approval number 73/440 on 11/09/2020.

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Effect of extended light activation and increment thickness on physical properties of conventional and bulk-filled resin-based composites

Cited by 12 publications

References 45 publications

Do high-viscosity bulk-fill composites polymerize sufficiently at deep layers?

Do high-viscosity bulk-fill composites polymerize sufficiently at deep layers?

Aging-Dependent Changes in Mechanical Properties of the New Generation of Bulk-Fill Composites

Impact of repeated preheating of bulk-fill resin composite on postoperative hypersensitivity; a randomized controlled clinical trial

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