Evaluation of light transmission through different esthetic posts and its influence on the degree of polymerization of a dual cure resin cement
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Cementation of fibre post with superior light transmitting ability using dual cured resin cement resulted in increased degree of polymerization.Abstract:
Aim: To measure the light transmission through different esthetic posts and to evaluate the degree of polymerization of dual cure resin cement cured through these posts Materials and Methods: The posts were divided into two experimental groups ie Group A (DT Light post); Group B (DT White post) and control ie Group C (metal post), each group having 10 samples Posts of each group were illuminated with curing light and photographs were taken keeping the parameters standardized to evaluate the intensity of light transmission at different levels The degree of polymerization of dual cure resin cement was evaluated using Fourier Transform Infrared spectroscopy The data obtained was subjected to statistical analysis Results: DT Light post showed highest light transmission and degree of polymerization The light intensity decreased from cervical to apical for both esthetic post but the decrease from middle to apical third was insignificant for DT White post group No light transmission was detected in metal post but the degree of polymerization decreased significantly from cervical to middle third Conclusion: Cementation of fibre post with superior light transmitting ability using dual cured resin cement resulted in increased degree of polymerizationread more
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References
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Journal Article
Effect of light intensity and exposure duration on cure of resin composite.
TL;DR: Routine exposure times of 60 seconds are recommended using light-source intensities of at least 400 mW/cm2 as measured with a commercial dental light intensity meter, and incremental layer thickness should not exceed 2 mm, with 1 mm being ideal.
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Fourier Transform Infrared Analysis of Degree of Polymerization in Unfilled Resins—Methods Comparison
TL;DR: DP was slightly enhanced in the bulk of the resin, as determined by a KBr-pellet technique, in comparison with results from a thin film method, but both techniques seem to provide useful and reproducible results for dental resins.
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Mechanical properties of resin cements with different activation modes.
TL;DR: No correlation was found between flexural strength and hardness, indicating that other factors besides the degree of cure (e.g. filler content and monomer type) affect theflexural strength of composites.
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Comparison of photo-activation versus chemical or dual-curing of resin-based luting cements regarding flexural strength, modulus and surface hardness.
TL;DR: For all materials and parameters, dual-curing produced higher values than LC, even when irradiation was performed through porcelain, and maintained flexural strength for all, the modulus for three and the hardness for one of the materials.
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A study of the physical and chemical properties of four resin composite luting cements.
TL;DR: Resin composite luting cements of similar chemical characterizations differed in their physical properties, and polymerization method influenced their degree of conversion.