Light transmittance characteristics and refractive indices of light-activated pit and fissure sealants

Arikawa, Hiroyuki; Shinohara, Naoyuki; Takahashi, Hideo; Kanie, Takahito; Fujii, Koichi; Ban, Seiji

doi:10.4012/dmj.2009-042

Cited by 9 publications

(3 citation statements)

References 16 publications

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“…In some composite resins, increased translucency has been used to increase the penetration of the curing light. However, some others have used new alternative photoinitiators [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Light-Curing Unit Type and Bulk-Fill Composite Resins with Different Photoinitiators on Marginal Gaps of Class II Restorations

Alavi

Darabi

Salari

et al. 2022

Pesqui. Bras. Odontopediatria Clín. Integr.

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Objective: To evaluate the effect of two types of light-curing units (second and third generations) and two types of bulk-fill composite resins with different photoinitiators -Tetric N-Ceram Bulk Fill (TNCB) and Xtra Fil (XTF) on gap formation at the gingival margins of Cl II restorations. Material and Methods: Fiftysix standard Cl II cavities were prepared on the mesial and distal surfaces of premolar teeth, with the gingival margin of the cavities 1 mm apical to the CEJ. The samples were randomly assigned to two groups based on the composite resin type and two subgroups based on the light-curing unit type and restored. After 5000 rounds of thermocycling, gingival margin gap in each sample was measured in µm under an electron microscope at ×2000 magnification. Data were analyzed by two-way ANOVA and Tukey tests (α=0.05). Results: Marginal gaps of TNCB composite resin were significantly smaller than those of XTF composite resin (p<0.001). There were no significant differences between the two light-curing units in each group (p=0.887 with XTF and p=0.999 with TNCB). Conclusion: The gaps at gingival margins of Cl II cavities with TNCB bulk-fill composite were smaller than XTF composite resin. Both composite resins can be cured with both the second-and third-generation LEDs.

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“…In some composite resins, increased translucency has been used to increase the penetration of the curing light. However, some others have used new alternative photoinitiators [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Light-Curing Unit Type and Bulk-Fill Composite Resins with Different Photoinitiators on Marginal Gaps of Class II Restorations

Alavi

Darabi

Salari

et al. 2022

Pesqui. Bras. Odontopediatria Clín. Integr.

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“…It may depend on the IoR. The IoR of steel, cement, dentin, and enamel is 2.5, 1.58, 1.54, and 1.63, respectively [ 39 , 40 ]. The IoR of zirconia filler in bulk-fill composites, glass in conventional composites and air is 2.35, 1.5, and 1, respectively.…”

Section: Discussionmentioning

confidence: 99%

Hardness and Depth of Cure of Conventional and Bulk-fill Composite Resins in Class II Restorations with Transparent and Metal Matrix Strips

Musavinasab,

Norouzi

2023

fid

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Objectives: Hardness is relevant to the degree of conversion (DC) and depth of cure (DoC). The aim of this study was to determine the micro-hardness and DoC of conventional and bulk-fill composite resins in class II restorations using metal and clear matrix bands. Materials and Methods: Twelve specimens of each of the two composite resins, i.e., Filtek Z350 XT bulk-fill and Gradia posterior conventional composite, were prepared in the form of a class II cavity in a tooth mold, using a clear or metal matrix band. All specimens were cured and stored at 37°C for 24 hours. Vickers hardness was measured as a function of DoC at 2mm intervals. Data were analyzed by two-way ANOVA (alpha=0.05). Results: The bulk-fill composite exhibited significantly higher hardness levels than the conventional composite in all tested surfaces (P<0.001). However, while the metal matrix band had a significant impact on the bottom surface (P=0.059) and also on the furthest surface from the matrix and light source (P=0.04), it did not have a consistent effect across all tested surfaces. The simultaneous interaction of the composites and matrix band types in all surfaces, did not show significant differences in hardness values. The highest bottom-to-top surface hardness ratio (73%) was observed in the conventional composite near the metal matrix band. Conclusion: In deep class II cavities, the bottom-to-top surface hardness ratio did not reach the maximum of 80%, neither for bulk-fill nor conventional posterior composites. Therefore, in such cavities extended light-curing and more incremental composite placement is needed.

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“…[ 16 ] The bulk-fill formulation usually contains new photoinitiators that are more sensitive but still require higher irradiance values to produce adequate degree of conversion with 4 mm or more increments. [ 17 18 ] In general, bulk-fill composites require 10s of curing at >1000 mW/cm 2 according to most manufacturers. [ 19 ]…”

Section: Discussionmentioning

confidence: 99%

Irradiance of different curing modes of common light cure devices: An in vitro study

Nassar

Almutairi

Makhdom

2020

J Int Soc Prevent Communit Dent

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A BSTRACT Aim: The aim of this study was to test the irradiance values of different curing modes of commonly available light cure devices (LCDs). Materials and Methods: An in vitro investigation was carried out to compare the irradiance output of 10 brands of LCDs available in Saudi Arabia measured using a digital radiometer. Values were recorded for three time points when applicable (0, 10, and 20s). This technique was repeated five times for each LCD. Normal, high-intensity, and soft-start modes were evaluated for all brands with the features available. Irradiance values between brands were analyzed using one-way analysis of variance followed by Bonferroni method. Changes in irradiance between different time points were analyzed using one sample t test for normal and high-intensity modes and using paired t test for soft-start mode. All comparisons were carried out at 0.05 significance level. Results: The highest values were reported for Ortholux Luminous, Elipar DeepCure-S, Elipar DeepCure, and KaVo mini-LED with values above 1000 mW/cm 2 . All LCDs showed values above 600 mW/cm 2 . Three LCDs had high-intensity mode and only one device had soft-start mode. Changes over the different time points were not statistically significant exept for soft-start mode. Conclusion: All tested LCDs had irradiance values sufficient for adequate polymerization of resin composite. Only four of these are capable of curing bulk-fill composites.

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Light transmittance characteristics and refractive indices of light-activated pit and fissure sealants

Cited by 9 publications

References 16 publications

Effect of Light-Curing Unit Type and Bulk-Fill Composite Resins with Different Photoinitiators on Marginal Gaps of Class II Restorations

Effect of Light-Curing Unit Type and Bulk-Fill Composite Resins with Different Photoinitiators on Marginal Gaps of Class II Restorations

Hardness and Depth of Cure of Conventional and Bulk-fill Composite Resins in Class II Restorations with Transparent and Metal Matrix Strips

Irradiance of different curing modes of common light cure devices: An in vitro study

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