Journal ArticleDOI
Polymerization kinetics of resin cements after light activation through fibre posts: an in vitro study.
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TLDR
The degree of conversion for VLV reduced after light activation through 9 mm Posts when compared to 3 mm and 6 mm posts, whilst the degree of Conversion for VLII decreased with every increase in post length.Abstract:
Aim
To measure the polymerization of light-cured (Variolink Veneer, VLV) and dual-cured (Variolink II, VLII) resin luting cements after light activation through different lengths of fibre post ex vivo.
Methodology
Degree of conversion after prolonged direct light activation (PLA) [12 min after LED light activation for 3 min] was determined using ATR-FTIR. Models were then produced to allow samples of VLV and VLII (n = 5 each group) to be light-activated through 3, 6 and 9 mm lengths of fibre post (Fiber Lux). Degree of conversion was assessed by ATR-FTIR and expressed as a percentage of the degree of conversion achieved after PLA. Data were analysed using anova and Tukey's test (P < 0.05).
Results
Mean [SD] degree of conversion for VLV and VLII after PLA was 57.97% [1.51] and 54.71% [3.77], respectively. Light activation of VLV through a 3 mm post produced 81.62% of the PLA value, compared with 71.03% for the 6 mm and 46.04% for the 9 mm post. Conversion after activation through 9 mm posts was significantly less than through 3 mm and 6 mm posts (P < 0.05). For VLII, activation through a 3 mm post produced 66.51% of the PLA value, compared with 54.38% for the 6 mm and 41.56% for the 9 mm post. A significant decrease in degree of conversion was noted for VLII as post length increased (P < 0.05).
Conclusions
The degree of conversion for VLV reduced after light activation through 9 mm posts when compared to 3 mm and 6 mm posts, whilst the degree of conversion for VLII decreased with every increase in post length.read more
Citations
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Predicting Transmitted Light Radiant Exposure of Fiber Dowel Cross Sections from Dowel Diameter and Length
TL;DR: Dowel diameter and length and length can predict TLRE at the apical end of a dowel cross section after controlling for dowel system effects.
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Light curing resin cements containing iodonium salts promote suitable apical bonding of posts to radicular dentin.
Thatiana de Vicente Leite,Andrea Nóbrega Cavalcanti,Adriano Fonseca Lima,Luciano de Souza Gonçalves,David C. Watts,Giselle Maria Marchi Baron,Luis Roberto Marcondes Martins +6 more
TL;DR: Light-cured ERCs containing DPI were efficient for GFP retention to radicular dentin, with similar behaviour to that of dual-curing commercial resin cement.
Journal ArticleDOI
Relationships of the Degree of C=C Double Bond Conversion with the Dielectric Properties for SiO 2 /1,2‐PB/SBS/EPDM Composites Cured by Organic Peroxide
TL;DR: In this paper , the degree of C=C double bond conversion rate (DC) was calculated by attenuation total reflectance Fourier transformation infrared spectrometry (ATR-FTIR).
Journal ArticleDOI
Effects of Both Fiber Post/Core Resin Construction System and Root Canal Sealer on the Material Interface in Deep Areas of Root Canal.
Hiroki Miura,Shinji Yoshii,Masataka Fujimoto,Ayako Washio,Takahiko Morotomi,Hiroshi Ikeda,Chiaki Kitamura +6 more
TL;DR: The results indicate that resin polymerization in the cavity differs among fiber post/core resin construction systems and that the adhesion of the resin and sealer depends on the property of the sealer.
References
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TL;DR: The dual-polymerization resin luting agents tested showed the best combination of mechanical and physical properties combined with the highest setting pH.
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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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Interfacial Chemistry of the Dentin/Adhesive Bond
TL;DR: The results from this study provide the first direct chemical evidence of phase separation in a dentin adhesive and its detrimental effect on the dentin/adhesive bond.