Influence of high irradiance light curing on the micromechanical properties of bulk fill resin-based composites.

Sayed, Ahmed; Mubarak, Rania

doi:10.21608/ajdsm.2021.101285.1258

Cited by 2 publications

(1 citation statement)

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“… 1 , 6 , 23 This reaction generates faster movement of radicals in the chain structure, resulting in enhanced polymerization and monomer conversion by achieving high reactivity and conversion rates with lower shrinkage. 1 , 34 , 45 In addition, Tetric N-Ceram Bulk Fill contains prepolymerized particles that also play a role in reducing polymerization stress, which would improve some of its mechanical properties. 21 Despite the above, the Tetric N-Ceram Bulk Fill exhibited lower bond strength at standard power (1000 mW/cm 2 × 20s), which contradicts the results of Besegato et al, 5 who reported that low-power irradiation over a long time interval provides slower polymerization, thus improving the mechanical properties of resin composites by forming longer chains with higher molecular weights than those formed with high-power irradiation.…”

Section: Discussionmentioning

confidence: 99%

Effect of Polywave and Monowave Light Curing Units on the Microtensile Bond Strength and Failure Types of Different Bulk-Fill Resin Composites: An in vitro Study

Castro-Ramirez,

Espinoza-Salcedo,

Huamani-Echaccaya

et al. 2024

CCIDE

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Aim This study aimed to evaluate the effects of polywave and monowave light-emitting diode curing units on the microtensile bond strength and failure types of three bulk-fill resin composites. Materials and Methods This in vitro experimental study was performed on 180 microbars obtained from human third molars and were distributed into 12 groups according to the type of bulk-fill resin composite and the light-curing unit. Third molars were restored using Filtek One Bulk Fill Restorative, Tetric ® N-Ceram Bulk Fill, and Opus Bulk Fill resin composites was light-cured with Elipar Deep Cure L and Valo in three modes: standard, high power, and extra power. Subsequently, microtensile analysis was carried out with a universal testing machine and the type of failure with an optical stereomicroscope. For statistical analysis, the Kruskal–Wallis H-test was used, with the Bonferroni post hoc test and Fisher’s exact test, considering a significance of p<0.05. Results There were significant differences in the microtensile bond strength between the Filtek One Bulk Fill restorative and Opus Bulk-Fill (p = 0.042) when light was cured with the polywave unit at standard power. On the other hand, the Filtek One Bulk Fill Restorative and Opus Bulk Fill resins showed significant differences in microtensile bond strength when light was cured with the monowave unit compared with the polywave unit (p<0.05). Conclusion The presence of alternative photoinitiator systems that are more reactive than camphorquinone produced higher microtensile bond strength in Tetric N-Ceram Bulk Fill and Opus Bulk Fill resins when light-cured with a high and standard polywave unit, respectively, compared to Filtek One Bulk Fill resins. Finally, Tetric N-Ceram Bulk Fill and Opus Bulk Fill resins had the highest percentage of mixed failures, while Filtek One Bulk Fill resin had adhesive failures, which was related to its lower microtensile bond strength.

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Section: Discussionmentioning

confidence: 99%

Effect of Polywave and Monowave Light Curing Units on the Microtensile Bond Strength and Failure Types of Different Bulk-Fill Resin Composites: An in vitro Study

Castro-Ramirez,

Espinoza-Salcedo,

Huamani-Echaccaya

et al. 2024

CCIDE

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Comparing the Curing Quality of Bulk-fill and Conventional Composites at Various Irradiation Times and Depths

Elmamooz,

Rezaei,

Eskandarizadeh

et al. 2024

Journal of Kerman University of Medical Sciences

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Background: Bulk-fill composites are a new class of materials introduced to speed up the clinical process of posterior restorations. This study compared the curing quality of bulk-fill and conventional composites at different irradiation times and depths. Methods: In this in-vitro study, 40 specimens from a bulk-fill composite, Tetric N-Ceram bulk-fill (TNB), and a conventional composite, Tetric N-Ceram (TN), were fabricated using a metal mold (6 mm×4 mm) (n=10). The composites were placed and cured in bulk for each composite. For each composite, half of the samples were cured for 20 seconds (s) using a light-emitting diode (LED) curing unit, and the irradiation time for the other half was 40. After 24 hours of storage in distilled water, the hardness of the samples was measured using a microhardness tester at different depths (0.1, 1, 2, 3, and 4 mm). Statistical analysis was done using multivariate ANOVA and independent t test (P ˂ 0.05). Results: Both composites presented a significant reduction in hardness value with increasing depth. TNB showed significantly higher hardness values at all depths in both irradiation times than conventional composite. TNB composite did not achieve a depth of cure (DOC) of 4 mm at any of the two curing times. Irradiation time significantly affects hardness values in both composites. Conclusion: Given that neither bulk-fill nor conventional composite was cured at depths greater than 3 mm, it is suggested that prolonged curing cycles be used to improve the DOC of composites.

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Influence of high irradiance light curing on the micromechanical properties of bulk fill resin-based composites.

Cited by 2 publications

References 0 publications

Effect of Polywave and Monowave Light Curing Units on the Microtensile Bond Strength and Failure Types of Different Bulk-Fill Resin Composites: An in vitro Study

Effect of Polywave and Monowave Light Curing Units on the Microtensile Bond Strength and Failure Types of Different Bulk-Fill Resin Composites: An in vitro Study

Comparing the Curing Quality of Bulk-fill and Conventional Composites at Various Irradiation Times and Depths

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