The effects of extended curing time and radiant energy on microhardness and temperature rise of conventional and bulk-fill resin composites

Par, Matej; Repusic, Igor; Skenderović, Hrvoje; Milat, Ognjen; Spajić, Jelena; Tarle, Zrinka

doi:10.1007/s00784-019-02807-1

Cited by 29 publications

(27 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The current study observed that the change in temperature was proportional to the increase in light intensity. This is consistent with the findings from previous literature [ 4 , 14 ]. Temperature increase during resin curing is a function of the rate of polymerization, as a result of exothermic polymerization reaction and the energy absorbed during polymerisation [ 15 ].…”

Section: Discussionsupporting

confidence: 94%

“…The most commonly used photoinitiator system in BRCs is camphorquinone (CQ), which has an absorption peak of approximately 470 nm that matches the wavelength emitted by most of the light-emitting diode (LED) LCUs on the market. A study conducted by Par et al [ 4 ] concluded that the benefit of using a higher-irradiance multiple-peak curing unit was found only in composites containing alternative photoinitiators, such as Lucirin, which can be activated by a broad spectrum of light sources. However, as the shorter violet wavelengths have limited penetration compared to the blue light, there is a risk of insufficient and uneven polymerisation [ 10 ].…”

Section: Discussionmentioning

confidence: 99%

“…High light intensity (radiance emittance) at effective wavelength provides sufficient energy to activate initiators, therefore enabling adequate resin polymerisation and good mechanical properties [ 6 ]. A recent study conducted by Par et al [ 4 ] have found that significantly higher microhardness was obtained with a higher intensity curing unit. These recent studies all suggest that there is a positive association where the mechanical strength is directly related to increased light curing intensity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effect of light curing intensity on bulk-fill composite resins: heat generation and chemomechanical properties

Wang

Grymak

Waddell

et al. 2021

Biomaterial Investigations in Dentistry

View full text Add to dashboard Cite

Objectives The aim of this study was to assess the effect of light curing intensity and wavelength spectrum on heat generation and chemomechanical properties of bulk-fill composites. Methods Four bulk-fill restorative materials (Filtek bulk-fill, Tetric PowerFill bulk-fill, Beautifil Bulk restorative and Admira Fusion X-tra were used in this study. A total of 100 cylindrical specimens of each composite ( n = 25/group) were prepared, then cured using monowave light curing unit (LCU) with a single light intensity of 1470 mW/cm 2 , and polywave LCU with three different light intensities (1200,2100, 3050mW/cm 2 ). The temperature change during polymerisation was measured by five K-type thermocouples placed in each 1 mm layer from top to bottom. Hardness and degree of conversion of composites at each level were evaluated. Results were statistically analysed. Results The use of polywave LCU resulted in statistically higher peak temperatures ranging between 31.4–63.5 °C compared to the temperature generated by monowave LCU ranging between 29.5–60 °C ( p < .05). Curing using polywave LCU with the highest light intensity of 3050 mW/cm 2 caused the highest peak temperature irrespective of the composite types. There was no significant difference in hardness with different light curing intensities and curing times, regardless of the bulk-fill resin materials ( p > .05). A positive correlation was also found between the hardness and the DoC of the four bulk-fill composites. Conclusion The change in temperature during polymerisation of bulk-fill composites were found to be proportional to the increase in light curing intensity. Mechanical properties of the bulk-fill composites were dependent on the composition and the type of photoinitiators.

show abstract

Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of light curing intensity on bulk-fill composite resins: heat generation and chemomechanical properties

Wang

Grymak

Waddell

et al. 2021

Biomaterial Investigations in Dentistry

View full text Add to dashboard Cite

show abstract

“…The analysis of relative influences of the factors "material" and "curing protocol" shows that the factor "material" was more influential for all of the outcome variables (initial MH, bottom/top MH ratio, and ethanol/initial MH ratio), whereas significant interactions between the factors "material" and "curing protocol" show that the effect of the curing protocol was inconsistent among materials. These results indicate that differences in material composition were a more important source of variability in mechanical properties 40,41 than the curing protocol, and that the effect of changing curing parameters was material-dependent 42 . It should be noted that due to the attenuation of curing light on its way through the composite specimen 43,44 , the effect size of the curing protocol was higher on the bottom specimen surface compared to the top surface.…”

Section: Discussionmentioning

confidence: 86%

The effect of rapid high-intensity light-curing on micromechanical properties of bulk-fill and conventional resin composites

Par

Marović

Attin

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

Rapid high-intensity light-curing of dental resin composites is attractive from a clinical standpoint due to the prospect of time-savings. This study compared the effect of high-intensity (3 s with 3,440 mW/cm 2 ) and conventional (10 s with 1,340 mW/cm 2 ) light-curing on micromechanical properties of conventional and bulk-fill resin composites, including two composites specifically designed for high-intensity curing. Composite specimens were prepared in clinically realistic layer thicknesses. Microhardness (MH) was measured on the top and bottom surfaces of composite specimens 24 h after light-curing (initial MH), and after subsequent immersion for 24 h in absolute ethanol (ethanol MH). Bottom/top ratio for initial MH was calculated as a measure of depth-dependent curing effectiveness, whereas ethanol/initial MH ratio was calculated as a measure of crosslinking density. High-intensity light-curing showed a complex material-dependent effect on micromechanical properties. Most of the sculptable composites showed no effect of the curing protocol on initial MH, whereas flowable composites showed 11-48% lower initial MH for high-intensity curing. Ethanol/initial MH ratios were improved by high-intensity curing in flowable composites (up to 30%) but diminished in sculptable composites (up to 15%). Due to its mixed effect on MH and crosslinking density in flowable composites, high-intensity curing should be used with caution in clinical work.

show abstract

“…This resulted in great effectiveness in exciting various types of photoinitiators. 36 Furthermore, the total irradiance output could be the same for the three different distances, because all the light output from the light-curing unit was conserved by using black rubber matrices. These factors could influence the color difference values.…”

Section: Discussionmentioning

confidence: 99%

Color stability of a bulk-fill composite resin light-cured at different distances

et al. 2020

View full text Add to dashboard Cite

show abstract

The effects of extended curing time and radiant energy on microhardness and temperature rise of conventional and bulk-fill resin composites

Cited by 29 publications

References 48 publications

The effect of light curing intensity on bulk-fill composite resins: heat generation and chemomechanical properties

The effect of light curing intensity on bulk-fill composite resins: heat generation and chemomechanical properties

The effect of rapid high-intensity light-curing on micromechanical properties of bulk-fill and conventional resin composites

Color stability of a bulk-fill composite resin light-cured at different distances

Contact Info

Product

Resources

About