Effect of LED curing on the microleakage, shear bond strength and surface hardness of a resin-based composite restoration
Author(s)
G. Oberholzer, Theunis
C. Du Preez, Ignatius
Kidd, M.
Griffith University Author(s)
Year published
2005
Metadata
Show full item recordAbstract
To determine the effect of Light emitting diode (LED) curing on dental resins, microleakage, shear bond strength and surface hardness of a dental composite cured with different LEDs were determined and compared with conventional halogen curing. For microleakage, Class V cavities were restored with Esthet-X, divided into groups, and exposed to one of the curing protocols (Elipar Freelight in soft start and standard modes; Ultra-Lume 2; Spectrum 800). Standard dye penetration tests were performed and the data summarised in a 2-way contingency table of observed frequencies. The Chi-square test was used (po0:05) to test for ...
View more >To determine the effect of Light emitting diode (LED) curing on dental resins, microleakage, shear bond strength and surface hardness of a dental composite cured with different LEDs were determined and compared with conventional halogen curing. For microleakage, Class V cavities were restored with Esthet-X, divided into groups, and exposed to one of the curing protocols (Elipar Freelight in soft start and standard modes; Ultra-Lume 2; Spectrum 800). Standard dye penetration tests were performed and the data summarised in a 2-way contingency table of observed frequencies. The Chi-square test was used (po0:05) to test for significant differences between the lights. For surface hardness, samples of Esthet-X were exposed to the light-curing units (LCUs). Vickers hardness was determined on the upper and the bottom surfaces. Data was subjected to statistical analysis usingANOVA (po0:05). Shear bond strength was determined using a push out method. Comparisons (ANOVA, po0:05) were made between the different curing protocols. No significant difference in microleakage could be demonstrated between the different LCUs at the enamel side -(p 젰:60). At the dentin side only the Elipar Freelight (soft start), could significantly reduce microleakage (po0:01). The hardness score for the halogen light was significantly lower than for the LED lights (po0:01). The Spectrum 800 and the Elipar Freelight (soft start) have significantly higher shear bond strengths than the others (po0:01). It was concluded that the LED source is more efficient for a comparable overall power output.
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View more >To determine the effect of Light emitting diode (LED) curing on dental resins, microleakage, shear bond strength and surface hardness of a dental composite cured with different LEDs were determined and compared with conventional halogen curing. For microleakage, Class V cavities were restored with Esthet-X, divided into groups, and exposed to one of the curing protocols (Elipar Freelight in soft start and standard modes; Ultra-Lume 2; Spectrum 800). Standard dye penetration tests were performed and the data summarised in a 2-way contingency table of observed frequencies. The Chi-square test was used (po0:05) to test for significant differences between the lights. For surface hardness, samples of Esthet-X were exposed to the light-curing units (LCUs). Vickers hardness was determined on the upper and the bottom surfaces. Data was subjected to statistical analysis usingANOVA (po0:05). Shear bond strength was determined using a push out method. Comparisons (ANOVA, po0:05) were made between the different curing protocols. No significant difference in microleakage could be demonstrated between the different LCUs at the enamel side -(p 젰:60). At the dentin side only the Elipar Freelight (soft start), could significantly reduce microleakage (po0:01). The hardness score for the halogen light was significantly lower than for the LED lights (po0:01). The Spectrum 800 and the Elipar Freelight (soft start) have significantly higher shear bond strengths than the others (po0:01). It was concluded that the LED source is more efficient for a comparable overall power output.
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Journal Title
Biomaterials
Volume
26
Subject
Physical Sciences not elsewhere classified