Argon ion laser and halogen lamp activation of a dark and light resin composite: microhardness after long-term storage

Cassoni, Alessandra; Ferla, Juliana de Oliveira; Albino, Luis Gustavo Barrotte; Youssef, Michel Nicolau; Shibli, Jamil Awad; Rodrigues, José Augusto

doi:10.1007/s10103-009-0708-x

Cited by 12 publications

(12 citation statements)

References 24 publications

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“…19 In another study, a 37.4 KHN and a 48.6% degree of conversion were reported for the Filtek Supreme-A3 activated with a QTH lamp; these values were considerably lower than the values observed in the present study due to the saturation of the nanofilled resin chosen. 8 The translucent resin (shade YT) showed no statistical differences between QTH or LED activation, and these results are similar to those of the present study, which showed similar KHN values independently of the light source.…”

Section: Discussioncontrasting

confidence: 69%

“…A Knoop diamond indenter was used to make fi ve indentations in the center of the surface opposite to the light-irradiated surface of the specimen with a 25 g load for 20 s. 8,19 The mean of the fi ve microhardness evaluations of each specimen was used as the specimen's microhardness value.…”

Section: 19mentioning

confidence: 99%

“…17 The light that initiates the polymerization may be absorbed or scattered through the body of the resin, jeopardizing the polymerization process. The lower transmittance of the light results in a low DC 18 and consequently low microhardness, 19 which is strongly influenced by the resin's opacity and its filler contents. 6,18,20 It has been speculated that darker resins, which are more saturated in croma, need a higher density of light energy to reach an acceptable monomer conversion than do lighter colored resins.…”

Section: Introductionmentioning

confidence: 99%

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Knoop microhardness and FT-Raman evaluation of composite resins: influence of opacity and photoactivation source

et al. 2011

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The aim of this study was to evaluate the degree of conversion by Knoop microhardness (KHN) and FT-Raman spectroscopy (FTIR) of one nanofilled (Filtek Supreme-3M-ESPE [FS]) and one microhybrid composite (Charisma-Heraeus-Kulzer [CH]), each with different opacities, namely enamel, dentin, and translucent, which were photo-activated by a quartz-tungsten-halogen lamp (QTH) and a light-emitting diode (LED). Resin was bulk inserted into a disc-shaped mold that was 2.0 mm thick and 4 mm in diameter, obtaining 10 samples per group. KHN and FTIR values were analyzed by two-way ANOVA and Tukey's tests (α = 0.05). Nanofilled resin activated by a LED presented higher microhardness values than samples activated by a QTH for dentin opacity (p < 0.05). The microhybrid resin showed no differences in KHN or FTIR values with different activation sources or opacity. The nanofilled dentin and enamel resins showed lower FTIR values than the translucent resin. The KHN values of the translucent resins were not influenced by the light source.

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Section: Discussioncontrasting

confidence: 69%

Section: 19mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Knoop microhardness and FT-Raman evaluation of composite resins: influence of opacity and photoactivation source

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“…14,15 Thermal cycling, 2,3,5,6,14 storage of the dry material at 37 o C in acids, and immersion in water, artificial saliva, or hot water [1][2][3][4]7,16 are some of the Graph 1 -Failure mode distribution according to surface treatment and repair and mechanical assay methodology.…”

Section: Discussionmentioning

confidence: 99%

“…[1][2][3][4][5] Studies have investigated the bonding strength of repairs of aged composites through thermal cycling 2,3,5,6 and immersion in hot water, acids, 2,3 water, or artificial saliva 1,4 for relatively short periods (24 h and 6 mos). [1][2][3][4][5]7 However, studies are needed to determine the behavior of repairs bonded to aged restorations for a longer period of time and the behavior of this repair subjected to the same aging period.…”

Section: Introductionmentioning

confidence: 99%

Effects of different surface treatments and accelerated artificial aging on the bond strength of composite resin repairs

et al. 2011

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Effects of different surface treatments and accelerated artificial aging on the bond strength of composite resin repairs Abstract: The purpose of the present study was to assess the bond strength of composite resin repairs subjected to different surface treatments and accelerated artificial aging. 192 cylindrical samples (CSs) were prepared and divided into 24 groups (n = 8). Half of the CSs were stored in water for 24 h, and the other half were subjected to C-UV accelerated aging for non-metallic specimens. The treatments were phosphoric acid + silane + adhesive (PSA); phosphoric acid + adhesive (PA); diamond bur + phosphoric acid + silane + adhesive (DPSA); diamond bur + phosphoric acid + adhesive (DPA); air abrasion + phosphoric acid + silane + adhesive (APSA); and air abrasion + phosphoric acid + adhesive (APA). The repair was performed and the specimens were again aged as described above. A control group (n = 8) was established and did not receive any type of aging or surface treatment. The specimens were loaded to failure in shear mode with a crosshead speed of 0.5 mm/min until fracture. Data were analyzed by one-way ANOVA/Tukey's test (p < 0.05). No statistically significant differences were found among DPSA, DPA, APSA, APA, and the control group. The aged PSA and PA achieved low bonding values and were statistically different from the control group, whereas the nonaged PSA and PA presented no statistically significant difference from the control group. Repairs with the proposed surface treatments were viable on both recent and aged restorations; however, phosphoric acid + adhesive alone were effective only on recent restorations.

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Influence of nanometer scale particulate fillers on some properties of microfilled composite resin

Garoushi

Lassila

Vallittu

2011

J Mater Sci: Mater Med

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The aim of this study was to evaluate the effect of different weight fractions of nanometer sized particulate filler on properties of microfilled composite resin. Composite resin was prepared by mixing 33 wt% of resin matrix to the 67 wt% of silane treated microfine silica particulate fillers with various fractions of nanometer sized fillers (0, 10, 15, 20, 30 wt%) using a high speed mixing machine. Test specimens made of the composites were tested with a three-point bending test with a speed of 1.0 mm/min until fracture. Surface microhardess (Vicker's microhardness) was also determined. The volumetric shrinkage in percent was calculated as a buoyancy change in distilled water by means of the Archimedes principle. The degree of monomer conversion (DC%) of the experimental composites containing different nanofiller fractions was measured using FTIR spectroscopy. Surface roughness (Ra) was determined using a surface profilometer. Nanowear measurements were carried out using a nanoindentation device. The water uptake of specimens was also measured. Parameters were statistically analysed by ANOVA (P < 0.05). The group without nanofillers showed the highest flexural strength and modulus, DC% and Ra value. The group with 30% nanofillers had the highest water uptake and volumetric shrinkage. No significant difference was found in Vicker's microhardness and the nanowear of the composites. The plain microfilled composite demonstrated superior properties compared to the composites loaded with nanofillers with the exception of surface roughness.

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Argon ion laser and halogen lamp activation of a dark and light resin composite: microhardness after long-term storage

Abstract: Light-activation significantly influenced the Knoop microhardness values for the darker nanofilled resin composite.

Cited by 12 publications

References 24 publications

Knoop microhardness and FT-Raman evaluation of composite resins: influence of opacity and photoactivation source

Knoop microhardness and FT-Raman evaluation of composite resins: influence of opacity and photoactivation source

Effects of different surface treatments and accelerated artificial aging on the bond strength of composite resin repairs

Influence of nanometer scale particulate fillers on some properties of microfilled composite resin

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