Influence of Sealer and Light-Curing Units on Push-Out Bond Strength Of Composite Resin to Weakened Roots

Lima, Adriana Corrêa de; Rached-Junior, Fuad Jacob Abi; Faria, Natália Spadini de; Messias, Danielle Cristine Furtado; Chaves, Carolina de Andrade Lima; Freitas, Jéssica Vavassori de; Baratto‐Filho, Flares; Silva‐Sousa, Yara Teresinha Corrêa

doi:10.1590/0103-6440201601010

Cited by 10 publications

(16 citation statements)

References 23 publications

(30 reference statements)

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“…Finally, Elipar DeepCure-S showed the greatest light intensity (1470 mw/cm²) values among the light devices studied and this may have affected the results. LED light curing unit with a greater light intensity showed better bond strength in a study by Lima et al (32) in which the effect of various LED light-curing units and a halogen light source on regional bond strength of resin composite to the weakened roots was assessed, which is consistent with our findings.…”

Section: Discussionsupporting

confidence: 92%

Effect of Light Sources on Bond Strength of Different Composite Resins Repaired with Bulk-Fill Composite

Kılıç

Hürmüzlü

2020

Odovtos - Int J Dent Sc

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The aim of this study was to evaluate and compare the effects of different light sources on shear bond strength when bulk-fill composite was used for the repair of different composite resins. A total of 126 samples made from six resin composites with different properties were aged (thermal-cycling with 5000 cycle), exposed to the same surface treatments and adhesive procedure. Then, they were repaired with a bulk-fill composite. At the polymerization step, each group was divided into three subgroups (n=7) and light cured with a QTH light source for 40s and two different LED light sources for 20s. Subsequently, the specimens were aged in distilled water at 37 ºC for 4 weeks and then subjected to shear bond strength test. Then, the specimens were examined under a stereomicroscope to identify modes of failure and visualized by Scanning Electron Microscope. Data obtained from the study were analyzed using ANOVA and Tukey HSD Test (α=0.05). In all groups, the light curing units had an impact on shear bond strength (p<0.05). Among the study groups, the greatest bond strength values were observed in the specimens repaired using the LED and the specimens repaired with the QTH light curing unit had the lowest bond strength values. It was concluded that the content of composite resins and light curing units may influence bond strength of different composites repaired with the bulk-fill composite.

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Section: Discussionsupporting

confidence: 92%

Effect of Light Sources on Bond Strength of Different Composite Resins Repaired with Bulk-Fill Composite

Kılıç

Hürmüzlü

2020

Odovtos - Int J Dent Sc

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“…The eugenol residues of these sealers can remain on dentin walls and, like all phenols, they release free radicals that may interfere with the polymerisation of dental adhesives (8). Furthermore, the sealer leaves an oily layer of debris that is difficult to remove, and may result in poor adhesive penetration of the root dentin, which affects bonding (18). The interaction of a resin composite containing Bis-GMA or other dimethacrylate compounds with phenolic radicals delays the initiation or accelerates the termination of the polymerisation reaction.…”

Section: Discussionmentioning

confidence: 99%

“…Other studies have also demonstrated poor bond strength between posts and root dentin after the use of a eugenol-based root canal sealer (6,10,18). Eugenol is only partially soluble in physiologic solution, as it is in water.…”

Section: Discussionmentioning

confidence: 99%

“…The interaction of a resin composite containing Bis‐GMA or other dimethacrylate compounds with phenolic radicals delays the initiation or accelerates the termination of the polymerisation reaction. Furthermore, the sealer leaves an oily layer of debris that is difficult to remove, and may result in poor adhesive penetration of the root dentin, which affects bonding . However, the effects of eugenol can be minimised by effectively cleaning the dentin .…”

Section: Discussionmentioning

confidence: 99%

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Effect of different protocols of eugenol removal on the bond strength between the fibre post and root dentin

et al. 2018

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The aim of this study was to evaluate the bond strength between the fibre post and root dentin after different cleaning protocols to remove eugenol from dentin. The residues and elemental composition of dentin were analysed using SEM and EDS. Bovine incisor roots were obturated with eugenol-based sealer. The post space was prepared, and the roots were divided into the following groups according to the cleaning protocol: unfilled (negative control), saline solution (positive control), 70% ethanol, acetone and 70% isopropyl alcohol. The fibre posts were cemented and push-out test realised. Chemical analysis of the dentin was performed using SEM and EDS. The bond strength values were analysed by anova/Fisher's and were as follows: negative control (7.30 ± 2.77) = 70% ethanol (6.64 ± 2.91) = 70% isopropyl alcohol (5.01 ± 3.15) = acetone (4.42 ± 1.53) >positive control (1.29 ± 0.56). It was concluded that 70% ethanol may be a good cleaning protocol to remove eugenol from dentin.

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“…A significant volume of dental research and clinical procedures involve the use of composite resin and a dental curing light (3). To achieve the manufacturer's intended mechanical properties for light cured resin-based composites (RBCs), the material must receive from the LCU sufficient energy at the appropriate wavelengths (2,(4)(5)(6)(7)(8).…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of the Light Output from 22 Contemporary Light Curing Units

et al. 2017

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This study measured the radiant power (mW), irradiance (mW/cm 2 ) and emission spectra (mW/cm 2 /nm) of 22 new, or almost new, light curing units (LCUs): -Alt Lux II, BioLux Standard, Bluephase G2, Curing Light XL 3000, Demetron LC, DX Turbo LED 1200, EC450, EC500, Emitter C, Emitter D, KON-LUX, LED 3M ESPE, Led Lux II, Optilight Color, Optilight Max, Optilux 501, Poly Wireless, Radii cal, Radii plus, TL-01, VALO Cordless. These LCUs were either monowave or multiple peak light emitting diode (LED) units or quartz-tungstenhalogen LCUs used in anterior and posterior teeth. The radiant power emitted by the LCUs was measured by a laboratory grade laser power meter. The tip area (cm²) of the LCUs was measured and used to calculate the irradiance from the measured radiant power source. The MARC-Patient Simulator (MARC-PS) with a laboratory grade spectrometer (USB4000, Ocean Optics) was used to measure the irradiance and emission spectrum from each LCU three times at the sensor located on the facial of the maxillary central incisors and then separately at the occlusal of a maxillary second molar. The minimum acceptable irradiance level was set as 500 mW/cm 2 . Irradiance data was analyzed using two-way ANOVA and the radiant power data was analyzed by one-way ANOVA followed by Tukey test (α=0.05). In general, the irradiance was reduced at the molar tooth for most LCUs. Only the Valo, Bluephase G2 and Radii Plus delivered an irradiance similar to the anterior and posterior sensors greater than 500 mW/cm 2 . KON-LUX, Altlux II, Biolux Standard, TL-01, Optilux 501, DX Turbo LED 1200 LCUs delivered lower irradiance values than the recommended one used in molar region, KON-LUX and Altlux II LCUs used at the maxillary incisors. Bluephase G2 and Optilight Max delivered the highest radiant power and KON-LUX, Altlux II and Biolux Standard delivered the lowest power. The emission spectrum from the various monowave LED LCUs varied greatly. The multi-peak LCUs delivered similar emission spectra to both sensors.

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Influence of Sealer and Light-Curing Units on Push-Out Bond Strength Of Composite Resin to Weakened Roots

Cited by 10 publications

References 23 publications

Effect of Light Sources on Bond Strength of Different Composite Resins Repaired with Bulk-Fill Composite

Effect of Light Sources on Bond Strength of Different Composite Resins Repaired with Bulk-Fill Composite

Effect of different protocols of eugenol removal on the bond strength between the fibre post and root dentin

An Evaluation of the Light Output from 22 Contemporary Light Curing Units

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