J Adv Prosthodont.  2018 Aug;10(4):291-299. 10.4047/jap.2018.10.4.291.

The effect of light sources and CAD/CAM monolithic blocks on degree of conversion of cement

• Çetindemir AB
• Åžermet B
• Öngül D

• KMID: 2418635
• DOI: http://doi.org/10.4047/jap.2018.10.4.291

Abstract

PURPOSE
To assess the degree of conversion (DC) and light irradiance delivered to light-cured and dual-cured cements by application of different light sources through various types of monolithic computer-aided design and computer-aided manufacturing (CAD/CAM) materials.
MATERIALS AND METHODS
RelyX Ultimate Clicker light-cured and dual-cured resin cement specimens with 1.5-mm thicknesses (n=300, 10/group), were placed under four types of crystalline core structure (Vita Enamic, Vita Suprinity, GC Ceresmart, Degudent Prettau Anterior). The specimens were irradiated for 40 seconds with an LED Soft-Start or pulse-delay unit or 20 seconds with a QTH unit. DC ratios were determined by using Fourier transform infrared spectroscopy (FTIR) after curing the specimen at 1 day and 1 month. The data were analyzed using the Mann-Whitney U test (for paired comparison) and the Kruskal-Wallis H test (for multiple comparison), with a significance level of P < .05.
RESULTS
DC values were the highest for RelyX Ultimate Clicker light-cure specimens polymerized with the LED Soft-Start unit. The combination of the Vita Suprinity disc and RelyX Ultimate Clicker dual-cure resin cement yielded significantly higher values at both timepoints with all light units (all, P < .05).
CONCLUSION
Within the limitations of this study, we conclude that the DC of RelyX Ultimate Clicker dual-cure resin cement was improved significantly by the use of Vita Suprinity and the LED Soft-Start light unit. We strongly recommend the combined use of an LED light unit and dual-cure luting cement for monolithic ceramic restorations.

Keyword

Computer-aided design and computer-aided manufacturing (CAD/CAM); Monolithic ceramic; Nanoceramic; Hybrid ceramic; Fourier transform infrared spectroscopy (FTIR)

MeSH Terms

Ceramics
Computer-Aided Design
Crystallins
Polymers
Resin Cements
Spectroscopy, Fourier Transform Infrared
Crystallins
Polymers
Resin Cements

Figure

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  Fig. 1 The study design for the groups. LC: Light-cure cement, DC: Dual-cure cement.

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  Fig. 2 Schematic drawing of FT-IR ATR measurement.

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  Fig. 3 Absorbance of RelyX Ultimate Clicker light-cure and dual-cure cements exposed to direct light.

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  Fig. 4 DCs of RelyX Ultimate Clicker light-cure and dual-cure cements exposed to direct light.

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  Fig. 5 DC ratios of RelyX Ultimate Clicker light-cure cement according to light unit and restorative material.

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  Fig. 6 DC ratios of RelyX Ultimate Clicker light-cure and dual-cure cements according to curing light.

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