Modulated photoactivation methods: Influence on contraction stress, degree of conversion and push-out bond strength of composite restoratives

Cunha, Leonardo Gonçalves; Alonso, Roberta Caroline Bruschi; Pfeifer, Carmem S.; Correr-Sobrinho, Lourenço; Ferracane, Jack L.; Sinhoreti, Mário Alexandre Coelho

doi:10.1016/j.jdent.2006.10.003

Cited by 57 publications

(64 citation statements)

References 23 publications

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“…Besides, the resin luting thickness was 0.5 mm, which is close to that seen in clinical situations, and it allowed satisfactory measurement by FTIR [1,5]. Some studies [26,30] used specimens with a cement thickness of about 1-2 mm, which is not clinically acceptable, as it may result in a lower degree of conversion at the bottom of the sample due to the depth of cure of the resinous material [21,30] and differences in the light curing irradiance that reaches all surfaces of the composite [14,37].…”

Section: Discussionsupporting

confidence: 56%

“…They have a spectral wavelength in the range 400-500 nm and an irradiance in the range 300-1,000 mW/cm 2 [12,13]. However, they have some drawbacks, such as gradual reduction in irradiance over time, the need for filters for wavelength selection, limited depth of cure, and considerable heat generation [14,15]. Blue light emitting diode (LED) units have a narrow spectral range, which targets the absorption wavelength of camphorquinone, with a peak value of 468 nm, allowing low amounts of wasted energy and minimum heat generation [14,16].…”

Section: Introductionmentioning

confidence: 99%

“…However, they have some drawbacks, such as gradual reduction in irradiance over time, the need for filters for wavelength selection, limited depth of cure, and considerable heat generation [14,15]. Blue light emitting diode (LED) units have a narrow spectral range, which targets the absorption wavelength of camphorquinone, with a peak value of 468 nm, allowing low amounts of wasted energy and minimum heat generation [14,16]. It has been claimed that this could provide higher monomer conversion efficiency and reduce the exposure time required [17].…”

Section: Introductionmentioning

confidence: 99%

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The effect of curing light and chemical catalyst on the degree of conversion of two dual cured resin luting cements

et al. 2010

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The aim of this study was to evaluate the influence of different curing lights and chemical catalysts on the degree of conversion of resin luting cements. A total of 60 disk-shaped specimens of RelyX ARC or Panavia F of diameter 5 mm and thickness 0.5 mm were prepared and the respective chemical catalyst (Scotchbond Multi-Purpose Plus or ED Primer) was added. The specimens were lightcured using different curing units (an argon ion laser, an LED or a quartz-tungsten-halogen light) through shade A2 composite disks of diameter 10 mm and thickness 2 mm. After 24 h of dry storage at 37°C, the degree of conversion of the resin luting cements was measured by Fouriertransformed infrared spectroscopy. For statistical analysis, ANOVA and the Tukey test were used, with p≤0.05. Panavia F when used without catalyst and cured using the LED or the argon ion laser showed degree of conversion values significantly lower than RelyX ARC, with and without catalyst, and cured with any of the light sources. Therefore, the degree of conversion of Panavia F with ED Primer cured with the quartz-tungsten-halogen light was significantly different from that of RelyX ARC regardless of the use of the chemical catalyst and light curing source. In conclusion, RelyX ARC can be cured satisfactorily with the argon ion laser, LED or quartz-tungsten-halogen light with or without a chemical catalyst. To obtain a satisfactory degree of conversion, Panavia F luting cement should be used with ED Primer and cured with halogen light.

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Section: Discussionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of curing light and chemical catalyst on the degree of conversion of two dual cured resin luting cements

et al. 2010

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“…In modern bonding technology, the dentin bonding interface frequently has incomplete polymerization, micro-phase separation and nanoleakage, which will adversely affect the performance of the dentin bonding (Cunha et al, 2007). Traditional water-wet bonding makes the collapsed collagen fiber network resume a fluffy state, but excess moisture in the bonding interface leads to phase separation and nanoleakage.…”

Section: Discussionmentioning

confidence: 99%

“…However, water-wet bonding has difficulty in controlling moisture and in standardization, and excessive moisture in the bonding interface often leads to hydrophobic resin monomers not completely penetrating, which results in the negative phenomenon of affecting dentin bonding properties such as incomplete polymerization, micro-phase separation, and nanoleakage (Tay and Pashley, 2003;Cunha et al, 2007). Therefore Pashley et al (2007) proposed an ethanol-wet bonding technique where ethanol displacing water in dentin not only can reduce the moisture content of the dentin surface, but also can make it easier for adhesive resin to penetrate the dentin collagen fiber network, thereby facilitating the formation of a dense and homogeneous mixture of a hydrophobic layer to increase its bond strength and durability.…”

Section: Introductionmentioning

confidence: 99%

Effects of light curing modes and ethanol-wet bonding on dentin bonding properties

Wang

Hong

et al. 2016

J. Zhejiang Univ. Sci. B

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Abstract:Objective: This study explored the effects of different light curing modes and ethanol-wet bonding on dentin bonding strength and durability. Methods: A total of 54 molars were randomly divided into three groups: Single Bond 2, Gluma Comfort Bond, and N-Bond. Based on the three light-curing modes and presence or absence of ethanol pretreatment, the samples were assigned to six subgroups: high-light mode, ethanol pretreatment+high-light mode, soft-start mode, ethanol pretreatment+soft-start mode, standard mode, and ethanol pretreatment+standard mode. All samples were bonded with resin based on the experimental groups. After 24 h and 6 months of water storage, a universal testing machine was used to measure microtensile bond strength. Scanning electron microscopy (SEM) was applied to observe mixed layer morphology. Results: The 24-h and 6-month microtensile bond strengths of the ethanol pretreatment groups were significantly higher than those of the non-ethanol pretreatment groups at the same light modes (P<0.05). With or without ethanol pretreatment, the microtensile bond strengths of the high-light modes were significantly lower than those of the soft-start modes and standard modes (P<0.05). The microtensile bond strengths of samples from the 6-month water storage group significantly decreased compared with those of samples from the 24-h water storage group (P<0.05). The soft-start groups and standard groups formed better mixed layers than the high-light mode groups, whereas the ethanol pretreatment groups formed more uniform mixed layers than those without ethanol pretreatment. Conclusions: Ethanol-wet bonding technique, soft-start, and standard modes could improve dentin bonding properties.

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Polymerization Shrinkage Stress

Schneider

Moraes

2017

Dental Composite Materials for Direct Restorations

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Modulated photoactivation methods: Influence on contraction stress, degree of conversion and push-out bond strength of composite restoratives

Cited by 57 publications

References 23 publications

The effect of curing light and chemical catalyst on the degree of conversion of two dual cured resin luting cements

The effect of curing light and chemical catalyst on the degree of conversion of two dual cured resin luting cements

Effects of light curing modes and ethanol-wet bonding on dentin bonding properties

Polymerization Shrinkage Stress

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