Aim: Esthetics of the provisional restorations is of prime importance to the patients especially in long term in the esthetic zone. Discolouration of these restorations may result in patient dissatisfaction and an additional expense for their replacement. LuxaCrown provisional material being new in market and claimed to be semi-permanent by the company needs to be evaluated for its colour stability. This in vitro study was aimed to evaluate and compare the colour stability of three provisional restorations using three pigmented solutions.
Setting And Design: In vitro - comparative study.
Materials And Methods: LuxaCrown, Protemp4, Heat cure PMMA were evaluated. 40 specimens of each material were divided into four groups of ten specimens each. Each group was stored in three staining solutions and artificial saliva. Colour values of each specimen were measured before immersion, after one day, one week, one month, three months and six months with a spectrophotometer.
Stastistical Analysis Used: One way ANOVA, Post Hoc Tukey Test, Bonferonni Test.
Results: Least colour change was seen in Heat Cure PMMA followed by Protemp4 and highest colour change was seen in LuxaCrown when immersed in artificial saliva, tea and coffee. Whereas in turmeric, Heat Cure PMMA showed the least colour change followed by LuxaCrown and highest colour change was seen in Protemp4 at all time intervals except day one, where LuxaCrown was higher than Protemp4.
Conclusion: Heat cure showed the best results as compared to Protemp4 and LuxaCrown in terms of colour stability at all time periods.
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Source |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8262438 | PMC |
http://dx.doi.org/10.4103/jips.jips_622_20 | DOI Listing |
Materials (Basel)
December 2024
Fraunhofer WKI, 38108 Braunschweig, Germany.
Despite its importance, the determination of the degree of cure of melamine-based laminates often relies on tests with limited accuracy and validity. Undercured surfaces may suffer insufficient resistance to scratching and heat as well as substandard surface quality. Overcured melamine surfaces tend to crack and entail the inefficient utilization of the press-the panels could have been pressed for a shorter time.
View Article and Find Full Text PDFPolymers (Basel)
December 2024
Enikolopov Institute of Synthetic Polymeric Materials of Russian Academy of Sciences (ISPM RAS), Profsoyuznaya Str. 70, 117393 Moscow, Russia.
To achieve the actuation of silicone-based foamed composites, a liquid-gas phase transition of the liquid captured in its pores is employed. The uncertainty of key parameters for a single or sequential open-air performance of such soft actuators limits their application. To define the main characteristics of the composites, in this work, two functions of the liquid there were separated: the pore-forming agent (FPA) and working liquid (WL).
View Article and Find Full Text PDFSci Rep
December 2024
School of Physics, Nanjing University of Science and Technology, Nanjing, 210094, China.
Molding has been widely used to manufacture thermoset composite structures in the aerospace and automotive industries owing to its efficiency in reducing the number of parts and the manufacturing cost. For such molded composite parts, the degree-of-cure curve is generally used to evaluate the solidification of the resin. Nevertheless, in simulation of cure is not the cure model itself, but rather knowing the initial conditions such as fiber volume fraction, initial curing degree, convective boundary conditions etc.
View Article and Find Full Text PDFMolecules
December 2024
School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China.
Waterborne polyurethane (WPU) was cured with a flame retardant composed of polydimethylsiloxanes and boron phenolic resin. In comparison to unmodified WPU, the heat resistance of the cured WPU film was significantly improved by approximately 40.0 °C, and the limited oxygen index (LOI) increased from 21.
View Article and Find Full Text PDFHeliyon
November 2024
Department of Prosthetic Dentistry, College of Dentistry King Khalid University, Abha, Saudi Arabia.
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