Influence of light curing source on microhardness of composite resins of different shades

Briso, André Luiz Fraga; Fedel, Tânia Maria; Pereira, Sibéria de Morais; Mauro, Sílvio José; Sundfeld, Renato Herman; Sundefeld, Maria Lúcia Marçal Mazza

doi:10.1590/s1678-77572006000100003

Cited by 12 publications

(17 citation statements)

References 22 publications

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“…The hardness ratio should not be less than 80% for composite resins that are adequately cured 5,13,18,21,26 . The hardness ratio of the composite resin specimens light cured with the FL2 LCU was significantly lower in the four- and eight-layer groups compared to the control group.…”

Section: Discussionmentioning

confidence: 99%

Effect of a multi-layer infection control barrier on the micro-hardness of a composite resin

et al. 2012

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ObjectiveThe aim of this study was to evaluate the effect of multiple layers of an infection control barrier on the micro-hardness of a composite resin. Material and MethodsOne, two, four, and eight layers of an infection control barrier were used to cover the light guides of a high-power light emitting diode (LED) light curing unit (LCU) and a low-power halogen LCU. The composite specimens were photopolymerized with the LCUs and the barriers, and the micro-hardness of the upper and lower surfaces was measured (n=10). The hardness ratio was calculated by dividing the bottom surface hardness of the experimental groups by the irradiated surface hardness of the control groups. The data was analyzed by two-way ANOVA and Tukey's HSD test. ResultsThe micro-hardness of the composite specimens photopolymerized with the LED LCU decreased significantly in the four- and eight-layer groups of the upper surface and in the two-, four-, and eight-layer groups of the lower surface. The hardness ratio of the composite specimens was <80% in the eight-layer group. The micro-hardness of the composite specimens photopolymerized with the halogen LCU decreased significantly in the eight-layer group of the upper surface and in the two-, four-, and eight-layer groups of the lower surface. However, the hardness ratios of all the composite specimens photopolymerized with barriers were <80%. ConclusionsThe two-layer infection control barrier could be used on high-power LCUs without decreasing the surface hardness of the composite resin. However, when using an infection control barrier on the low-power LCUs, attention should be paid so as not to sacrifice the polymerization efficiency.

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Section: Discussionmentioning

confidence: 99%

Effect of a multi-layer infection control barrier on the micro-hardness of a composite resin

et al. 2012

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“…Some authors indicate that the QTH and LED units have a similar, adequate efficacy in polymerizing composites (Uhl et al, 2002). Previous studies indicated that LED efficacy might depend on the light intensity (Briso et al, 2006;Iriyama et al, 2009;Jung et al, 2001). In addition, different QTH units might provide considerably different results (da Silva et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…The clinical importance of BAs justifies the investigation of methods to improve their polymerization. These methods include light curing and warming (Briso et al, 2006;Iriyama et al, 2009;Jung et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

The effects of light curing units and environmental temperatures on CC conversion of commercial and experimental bonding agents

Kashi

Erfan

Kalbasi³

et al. 2014

The Saudi Dental Journal

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“…The darker shades have been reported to exhibit a reduction in light transmission not curing as deeply as lighter shades (12,13). Besides, more translucent materials are considered to allow better light transmission which would result in a higher degree of conversion.…”

Section: Introductionmentioning

confidence: 99%

Microhardness of different resin cement shades inside the root canal

Vignolo

Fuentes²,

Garrido³

et al. 2012

Med Oral

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Objectives: To compare microhardness along the root canal post space of two resin cements in different shades and a dual-cure resin core material. Study Design: Root canals of 21 bovine incisors were prepared for post space. Translucent posts (X•Post, Dentsply DeTrey) were luted using one the following resin luting agent: Calibra (Dentsply DeTrey) in Translucent, Medium and Opaque shades, RelyX Unicem (3M ESPE) in Translucent, A2 and A3 shades and the dual-cure resin core material Core•X flow. All materials were applied according to manufacturers’ instructions and were all photopolymerized (Bluephase LED unit, Ivoclar Vivadent, 40s). After 24 hours, roots were transversally cut into 9 slices 1 mm thick from the coronal to apical extremes, three corresponding to each root third. Then, VHNs were recorded (100 gf, 30 s) on the resin luting materials along the adhesive interface in all sections. Data were analyzed by two-way ANOVA and SNK tests (α=0.05). Results: A significant influence on microhardness of resin luting material in their respective shades (p<0.001), root third (p<0.001) and interactions between them was detected (p<0.001). RelyX Unicem cement showed the highest microhardness values and Calibra the lowest, regardless of the shade selected. All resin luting materials tested exhibited a significantly higher microhardness in the cervical third. Conclusions: Microhardness of resin luting agents tested inside the canal is dependent on material brand and resin cement shade seems to be a less relevant factor. Microhardness decreased along the root canal, regardless of the shade selected. Key words:Cement shade, degree of conversion, dual-cured resin cements, fiber posts, microhardness, root thirds.

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Influence of light curing source on microhardness of composite resins of different shades

Cited by 12 publications

References 22 publications

Effect of a multi-layer infection control barrier on the micro-hardness of a composite resin

Effect of a multi-layer infection control barrier on the micro-hardness of a composite resin

The effects of light curing units and environmental temperatures on CC conversion of commercial and experimental bonding agents

Microhardness of different resin cement shades inside the root canal

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