Effectiveness of composite resin polymerization using light-emitting diodes (LEDs) or halogen-based light-curing units

Micali, Bianca; Basting, Roberta Tarkany

doi:10.1590/s1806-83242004000300016

Cited by 30 publications

(33 citation statements)

References 17 publications

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“…Dental composite color stability has also been associated with the degree of resin conversion 16) . A correlation was also found between degree of conversion and composite solubility as well as solubility and salivary sorption 17) .…”

Section: Discussionmentioning

confidence: 99%

Effect of staining solutions on color of pre-reacted glass-ionomer containing composites

et al. 2012

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This study investigated the color stability of pre-reacted glass-ionomer containing composite restoratives. The materials evaluated included one regular (Beautifil II [BF]), two flowable (Beautifil Flow [F02, F10]) and two recently introduced flowable "plus" (Beautifil Flow Plus [F00, F03]) pre-reacted glass-ionomer containing composite restoratives. Twelve specimens of each material (A3 shade) were fabricated, allowed to set for 24 h at 37°C and randomly divided into 4 groups. After baseline spectrophotometric (Crystaleye, Olympus) color measurements, specimens were immersed in water, cola, red wine and coffee for 7 days. Post-immersion color measurements were taken and color changes (ΔE) were computed accordingly. Statistical analysis was done using ANOVA and post-hoc Scheffe's test (p<0.05). For pre-reacted glass-ionomer containing composites, color changes after immersion in coffee and red wine were significantly greater than in cola and water. Differences in ΔE values between materials were solution dependent. The least color change was generally observed with the flowable "plus" pre-reacted glass-ionomer containing composites.

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Section: Discussionmentioning

confidence: 99%

Effect of staining solutions on color of pre-reacted glass-ionomer containing composites

et al. 2012

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“…3,14 However, soft-start polymerization systems have demonstrated no significant reduction in polymerization shrinkage, no differences in hardness and no better marginal adaptation of resin composite restorations bonded to dentinal cavities. 24 In this study, FT-Raman spectroscopy was used to evaluate a possible interference in the DC of resin composites produced by the type of LCUs, by light irradiance, by soft-start mode and by LCU light guide tip.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Soft-start Polymerization by Second Generation LEDs on the Degree of Conversion of Resin Composite

Soares¹,

Liporoni²,

Martin³

2007

Operative Dentistry

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©Operative Dentistry, 2007, 32-2, 160-165 LES Soares • PCS Liporoni • AA Martin Clinical RelevancePhoto-polymerization using second generation LED and halogen light in the soft-start mode of curing was able to produce an adequate degree of conversion in resin composites. The lower degree of conversion produced by low power LED in the soft-start mode could lead to restoration failure, degradation of the organic matrix and recurrent caries. SUMMARYFourier-Transform (FT)-Raman spectroscopy was used to evaluate in vitro the degree of conversion (DC) of Charisma dental composite cured by three different light curing units (LCUs) using soft-start and normal protocols. Eighty circular blocks of resin (7 mm in diameter x 2.5 mm thick) were prepared and cured using the following sources: halogen light (Degulux soft-start, n=20, G1-G2), low power light emitting diode (LED) with transparent polymer tip (LD13, n=20, G3-G4) and fiber optic tip (LD13, n=20, G5-G6) and, finally, high power LED (Radii, n=20, G7-G8). The top and bottom surfaces of the blocks were analyzed by FT-Raman spectroscopy. The respective DCs were estimated calculating the peak height ratio of the aliphatic C=C (1640 cm -1 ) and aromatic C=C (1610 cm -1 ) Raman modes. The DC at the surfaces ranged between 50% and 60% for the top and 46% and 58% for the bottom. The halogen light and high power LED LCUs with the soft-start and normal protocols produced the highest DC values of dental composite at both surfaces (p<0.001). Curing by low power LED in the soft-start protocol did not produce adequate DC at the depth of 2.5 mm. The type of LCU light guide tip did not present a significant statistical difference in the final DC of the dental composite (p>0.05).

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“…Since their introduction to the dental market, composite resins have undergone many changes in their formulation to improve their mechanical and physical properties. It has been shown that their incomplete polymerization affects the degree of conversion resulting in reduced mechanical properties and greater staining susceptibility [3].…”

Section: Introductionmentioning

confidence: 99%

Stain susceptibility of composite and ceramic CAD/CAM blocks versus direct resin composites with different resinous matrices

et al. 2016

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To evaluate the stain susceptibility of CAD/ CAM blocks and direct composite after long term exposure to various staining agents. 40 disk-shaped samples were fabricated from each of nine materials; six CAD/CAM (Vitablocs Mark II, Paradigm MZ100, Experimental Vita Hybrid Ceramic, Vita Enamic, Experimental Kerr and Lava Ultimate) and three direct composites (Filtek Supreme, Venus Diamond and Filtek Silorane). Samples were randomly divided into five groups (n = 8) according to different staining solutions (distilled water, tea, red wine, coffee and artificial saliva). Initial L*a*b* values were assessed using a calibrated digital spectrophotometer. Specimens were immersed in staining solutions and stored in an incubator at 37°C for 120 days. L*a*b* values were assessed again and color change (DE) was calculated as difference between recorded L*a*b* values. ANOVA, and Duncan test were used to identify differences between groups (a = 0.05). Significant differences in DE values were detected between materials (p = 0.000). Among all staining solutions, the highest DE value was observed with red wine. The new CAD/CAM blocks (Vita Enamic, Vita Hybrid Ceramic and Lava Ultimate) showed the highest resistance to staining compared to the MZ100 composite resin blocks. Filtek Silorane, a direct composite, showed high stain resistance values compared to CAD/CAM materials and other direct composites. Ceramic and composite CAD/CAM blocks had lower staining susceptibility than methacrylate based direct composite. Staining susceptibility of the new resin based CAD/CAM materials Vita Enamic and Lava Ultimate was comparable to feldspathic ceramic blocks (Vitablocs Mark II). Filtek Silorane showed promising results that were comparable to some CAD/CAM blocks.

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Effectiveness of composite resin polymerization using light-emitting diodes (LEDs) or halogen-based light-curing units

Cited by 30 publications

References 17 publications

Effect of staining solutions on color of pre-reacted glass-ionomer containing composites

Effect of staining solutions on color of pre-reacted glass-ionomer containing composites

The Effect of Soft-start Polymerization by Second Generation LEDs on the Degree of Conversion of Resin Composite

Stain susceptibility of composite and ceramic CAD/CAM blocks versus direct resin composites with different resinous matrices

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