Influence of light irradiation on Vickers hardness of dual-cure cement polymerized under restorations

Shiomuki, Daisaku; Matsuda, Hiroyuki; Tanaka, Takuo; Suzuki, Shiro

doi:10.4012/dmj.2012-306

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…Hardness is an intrinsic property of materials independent of the hardness test methods employed [36]. e VH test was chosen for the present study which is analogous to the previous studies [37][38][39]. Differences in hardness between the top and bottom surfaces of the specimen were frequently used to detect the polymerization, but the present study employed a different specimen design (much thinner than those in the published studies).…”

Section: Resultsmentioning

confidence: 98%

Polymerization Efficiency of a Dual-Cured Resin Cement through Zirconia with Three Different Cusp Inclinations

Zhang

Cheng

et al. 2018

Journal of Spectroscopy

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Assessing the polymerization efficiency of a dual-cured resin cement through zirconia with three different cusp inclinations is the aim of this study. Seventy-two resin cement (Multilink Speed) specimens were light-cured through the zirconia with three different cusp inclinations (30°, 20°, and 0°) for 20 s or 40 s (n=12). For each group, the Vickers hardness (VH) measurement was performed on half of the specimens, whereas the degree of conversion (DC) was tested for the other half with a Fourier transform infrared spectrometer. The recorded data were analyzed with a two-way ANOVA. Varied VH (32.3 ± 3.2–40.3 ± 4.8) and DC (50.5% ± 3.0%–59.6% ± 2.4%) values were obtained from different groups. The cusp inclinations significantly affect the VH (p=0.001) and DC (p<0.001) of the resin cement, and the curing time exhibited a significant effect on the DC (p=0.014) of resin cement but not on the VH (p=0.167). In conclusion, the cusp inclination of zirconia significantly affects the polymerization efficiency of dual-cured resin cement.

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Section: Resultsmentioning

confidence: 98%

Polymerization Efficiency of a Dual-Cured Resin Cement through Zirconia with Three Different Cusp Inclinations

Zhang

Cheng

et al. 2018

Journal of Spectroscopy

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“…These results are consistent with those reported previously. A study by Shiomuki et al [38] on the Vickers microhardness of Panavia F dual-cure resin cement through a zirconia disc showed no significant differences in microhardness between the areas exposed to direct light and those away from light.…”

Section: Discussionmentioning

confidence: 99%

Effect of Delayed Light-Curing Through a Zirconia Disc on Microhardness and Fracture Toughness of Two Types of Dual-Cure Cement

Samimi

Kaveh

Khoroushi

2019

JDT

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Objectives: Photopolymerization immediately sets dual-cure cements and prevents the continuation of chemical polymerization. Delayed light-curing allows the chemical process to continue up to the point before starting irradiation; however, there is a controversy in this respect. The present study evaluates the effect of delayed light-curing through a zirconia disc on the microhardness and fracture toughness (KIC) of two types of dual-cure cement. Materials and Methods: Samples measuring 25×5×3 mm3 were prepared for fracture toughness test, and discs measuring 5 mm in diameter and 3 mm in thickness were prepared for microhardness test using Bifix and BisCem cements. Light-curing protocols were as follows: immediate light-curing (group A), a 2-minute delay (group B), a 5-minute delay (group C), direct irradiation (group D), and no irradiation (group E). In groups A to C, light-curing was carried out through a zirconia disc. Data were analyzed by two-way and one-way analysis of variance (ANOVA), post-hoc Tukey's test, and Kruskal-Wallis test at 95% confidence interval. Results: There was a significant difference in the microhardness of the cements (P=0.00). Delayed light-curing had no effect on microhardness (P=0.080). The microhardness of BisCem in group E was significantly lower than that in group D (P=0.015). The fracture toughness of Bifix in groups B and C was significantly different than that in group E and BisCem groups. Conclusions: Under the limitations of our study, delayed light-curing had different effects on microhardness and fracture toughness. Differences in light-curing protocols resulted in different effects based on the cement type. Light-curing is recommended to achieve optimal mechanical properties.

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“…Light activation provides a rapid, ondemand boost to the setting reaction, allowing improved double bond conversion and mechanical properties compared with self-polymerization only. Several studies have indicated substantial improvements in the double bond conversion of methacrylate with sufficient light irradiation compared with less light irradiation 31,32) .…”

Section: Discussionmentioning

confidence: 99%

Effect of light irradiation and primer application on polymerization of selfadhesive resin cements monitored by ultrasonic velocity

et al. 2018

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In this study, we investigated the effect of light irradiation and primer/adhesive application on the polymerization reaction and elastic modulus (E) of self-adhesive resin cement (SAC) through ultrasonic velocity (V) measurements. The V values of longitudinal and shear waves were determined based on the transit time through the specimens and specimen thicknesses, and were used to calculate the E values. Analysis of variance and Tukey tests revealed that V increased rapidly, reaching a plateau at 2,700-2,900 m/s, when the SACs were light-irradiated. However, the increasing rate of V was retarded for the non-irradiated SACs. In addition, when the primer/adhesive was applied, higher E values were obtained after 24 h. Finally, the polymerization behavior of the SACs was affected by light irradiation and primer application, and the use of prime/adhesive might improve mechanical properties. In clinical situations, use of primer/adhesive is recommended for getting proper adhesion.

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Influence of light irradiation on Vickers hardness of dual-cure cement polymerized under restorations

Cited by 5 publications

References 25 publications

Polymerization Efficiency of a Dual-Cured Resin Cement through Zirconia with Three Different Cusp Inclinations

Polymerization Efficiency of a Dual-Cured Resin Cement through Zirconia with Three Different Cusp Inclinations

Effect of Delayed Light-Curing Through a Zirconia Disc on Microhardness and Fracture Toughness of Two Types of Dual-Cure Cement

Effect of light irradiation and primer application on polymerization of selfadhesive resin cements monitored by ultrasonic velocity

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