Are polywave light-emitting diodes more effective than monowave ones in the photoactivation of resin-based materials containing alternative photoinitiators? A systematic review

Lima, Renally Bezerra Wanderley e; Melo, Ana Margarida dos Santos; Dias, Joselúcia da Nóbrega; Barbosa, Laryssa Mylenna Madruga; Santos, João Vitor do Nascimento; Souza, Grace M. De; Andrade, Ana Karina Maciel de; Assunção, Isauremi Vieira de; Borges, Boniek Castillo Dutra

doi:10.1016/j.jmbbm.2023.105905

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…In orthodontic research, light intensity plays a less important role than curing time because the energy emitted by the device will pass via the bracket's thickness, the adhesive material, and the tooth. This is nearly consistent with a recent study [ 17 ] that revealed that high-power LEDs produced the least temperature change when comparing halogen lights with LEDs of varying powers and exposure times.…”

Section: Discussionsupporting

confidence: 92%

“…It was discovered that the TCG (with an exposure time of 20 sec and an intensity of 1200 mw/cm 2 ) took the longest for the pulp chamber to reach its starting temperature after curing (58 sec), while the QCG (with an exposure time of 3 sec and an intensity of 2500 mw/cm 2 ) took 20 sec. Given that light energy is the product of exposure time and light intensity, this could result in the curing device reaching its maximum energy [ 17 ]. This is nearly in accordance with a recent study [ 7 ] that examined two distinct light sources, plasma arc light and LED light (VALO ortho cordless), with varying power and exposure times.…”

Section: Discussionmentioning

confidence: 99%

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Temperature Changes in the Pulp Chamber During Orthodontic Bonding Using a High-Power Light-Emitting Diode Device With Two Different Exposure Times and Intensities: An In-Vitro Study

Alsafadi,

Rajeh,

Hajeer

et al. 2024

Cureus

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Objective: This study used a high-power light-emitting diode (LED) device to evaluate the effects of two exposure times and intensities on pulp chamber temperature and cooling time during bracket bonding.Materials and methods: Sixty upper premolars were used in the sample in this study. These premolars were split into two main groups based on the exposure time and intensity: the first group employed a traditional curing mode (TCG) for 20 seconds with an intensity of 1200 mw/cm 2 , whereas the second group had a quick curing mode (QCG) for 3 seconds with an intensity of 2500 mw/cm 2 . The pulp chamber's temperature variations and cooling times were recorded using a thermal imaging camera. The Mann-Whitney U test was used to find differences between the two-group comparison of the pulp chamber's temperature and cooling time.Results: The two groups had statistically significant differences regarding the temperature increase in the pulp chamber and cooling time (p > 0.001). The mean temperature increase in the traditional curing group was 3.52°C, which is greater than that in the quick curing group (i.e., a mean value of 1.28°C). The mean cooling time in the traditional curing group was 38.83 seconds, which is greater than that in the quick curing group (9.97 seconds). Conclusions: Reducing the exposure time to 3 seconds and increasing the intensity to 2500 mw/cm 2 is considered safer for the pulp chamber during and after the curing process.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Temperature Changes in the Pulp Chamber During Orthodontic Bonding Using a High-Power Light-Emitting Diode Device With Two Different Exposure Times and Intensities: An In-Vitro Study

Alsafadi,

Rajeh,

Hajeer

et al. 2024

Cureus

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“…This study used the polywave LED LCU (Bluephase G2) to ensure adequate material polymerization and achieve excellent mechanical properties of the resin cement because Variolink Esthetic LC and Variolink Esthetic DC resin cements have Ivocerin as their photoinitiator, which is primarily sensitized by wavelengths range of (380-420 nm) making it essential to use polywave LCU ( 10 , 25 ). The preparation design used was butt-joint with an incisal reduction without palatal chamfer to provide a simplified preparation technique for better standardization and less marginal gap.…”

Section: Discussionmentioning

confidence: 99%

Microleakage of Lithium Disilicate Veneers Bonded to Different Substrates with Light-cure and Dual-cure Resin Cements

Albaheli,

Elawsya,

Ali

2024

J Clin Exp Dent

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Background This study aimed to evaluate the microleakage of lithium disilicate veneers with finish lines placed cervically in different substrates (enamel, dentin, and resin composite) and bonded with light-cure (LC) and amine-free dual-cure (DC) resin cements. Material and Methods Forty-eight human maxillary central incisors were randomly assigned into three groups according to finish line substrate (n=16/group). Each group was subdivided randomly into two subgroups (n=8/subgroup) according to resin cement type: LC resin cement (Variolink Esthetic LC, Ivoclar Vivadent) and DC resin cement (Variolink Esthetic DC, Ivoclar Vivadent). All the specimens received lithium disilicate veneers (IPS e.max Press, Ivoclar Vivadent). After 5000 cycles of thermocycling, the microleakage was measured using the dye penetrating technique. Data were analyzed statistically using Scheirer Ray Hare test, Kruskal-Wallis H-test, and Mann-Whitney U-test. The level of significance was set at p ≤ .05. Results There was a statistically significant difference between different substrates in microleakage ( p =.001), but there was no statistically significant difference between resin cements ( p =.907), and there was no interaction between substrates and resin cements (p=.983). Microleakage was lesser when the finish line was placed at enamel and resin composite than at dentin. Similar leakage scores were observed with LC and DC resin cements. Conclusions The finish line of ceramic veneer is suggested to be placed in enamel or good-quality resin composite restoration. Regarding microleakage and durability, LC and amine-free DC resin cements are suggested for ceramic veneer cementation. Key words: Different substrates, Dual-cure resin cement, Light-cure resin cement, Lithium disilicate veneers, Microleakage.

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Effect of Battery Level During Successive Charging Cycles on the Performance of Certified and Low-cost Uncertified Light-curing Units Available on E-commerce

Peres,

Oliveira,

da Silva Sakamoto

et al. 2024

Operative Dentistry

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SUMMARY Objective: To evaluate the influence of battery level on power (mW), emission spectrum (mW/cm2/ nm), and light distribution on the active tip (mW/ cm2) of certified (FDA/ANVISA) and low-cost uncertified light-curing units (LCUs) purchased through e-commerce. Methods: Seven LCUs, three certified: VALO Grand (Ultradent); Radii Xpert (SDI); and LED.B (Woodpecker); and four uncertified: 1 Sec; BS 300; LED curing light; and VAFU (VRN, AZDENT), were used. The LCUs were evaluated by calculating the power (mW) after each sequential five exposure cycles of 20 seconds and the emission spectrum (mW/cm2/nm) in the initial and final cycles, using an integrating sphere during three battery charging cycles. Beam profiling was used to check the light distribution on the LCU tip after every 50 exposure cycles until the battery fully discharged. Data were analyzed by linear regression between power and the number of exposure times (R2). Results: The certified LCUs VALO Grand (R2=0.005), LED.B (R2=0.02), and Radii Xpert (R2=0.09) and the uncertified LCU VAFU (R2=0.002) had no significant power reduction during the three battery charging cycles. The uncertified LCUs BS 300 (R2=0.87), 1 Sec (R2=0.60), and LED curing light (R2=0.83) showed significant power reduction, decreasing the emission spectrum (mW/cm2/nm) at the end of the battery charging cycle. The light distribution on the active tip across the level battery was modified significantly with successive exposure times. Conclusions: The certified LCUs (VALO Grand, Radii Xpert, and LED.B) and uncertified LCU (VAFU), maintained power, emission spectrum, and light distributions during the tested battery life cycles. Low-cost certified LCU LED.B exhibited inhomogeneous light concentrated at the center of the tip. Low-cost uncertified LCUs—BS 300, 1 Sec, and LED curing light—had significant power reductions during the battery cycles and increased inhomogeneous light distribution along the successive exposure times.

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Are polywave light-emitting diodes more effective than monowave ones in the photoactivation of resin-based materials containing alternative photoinitiators? A systematic review

Cited by 6 publications

References 47 publications

Temperature Changes in the Pulp Chamber During Orthodontic Bonding Using a High-Power Light-Emitting Diode Device With Two Different Exposure Times and Intensities: An In-Vitro Study

Temperature Changes in the Pulp Chamber During Orthodontic Bonding Using a High-Power Light-Emitting Diode Device With Two Different Exposure Times and Intensities: An In-Vitro Study

Microleakage of Lithium Disilicate Veneers Bonded to Different Substrates with Light-cure and Dual-cure Resin Cements

Effect of Battery Level During Successive Charging Cycles on the Performance of Certified and Low-cost Uncertified Light-curing Units Available on E-commerce

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