Colour stability and opacity of resin cements and flowable composites for ceramic veneer luting after accelerated ageing
| Autor: | Andrea Freire, Evelise Machado de Souza, Sérgio Vieira, Danilo Biazzetto de Menezes Caldas, Lucí Regina Panka Archegas |
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| Rok vydání: | 2011 |
| Předmět: |
Dental Stress Analysis
Time Factors Materials science Light Opacity medicine.medical_treatment Color Contrast Media Composite Resins Statistics Nonparametric Dental porcelain Materials Testing Spectroscopy Fourier Transform Infrared medicine In vitro study Ceramic Total energy Composite material Tetric Flow General Dentistry Light-Curing of Dental Adhesives Analysis of Variance Self-Curing of Dental Resins Dental Porcelain Resin Cements Dental Veneers Ageing visual_art visual_art.visual_art_medium Aluminum Silicates Colorimetry Veneer sense organs Rheology |
| Zdroj: | Journal of Dentistry. 39:804-810 |
| ISSN: | 0300-5712 |
| DOI: | 10.1016/j.jdent.2011.08.013 |
| Popis: | Colour changes of the luting material can become clinically visible affecting the aesthetic appearance of thin ceramic laminates. The aim of this in vitro study was to evaluate the colour stability and opacity of light- and dual-cured resin cements and flowable composites after accelerated ageing.The luting agents were bonded (0.2 mm thick) to ceramic disks (0.75 mm thick) built with the pressed-ceramic IPS Aesthetic Empress (n=7). Colour measurements were determined using a FTIR spectrophotometer before and after accelerated ageing in a weathering machine with a total energy of 150 kJ. Changes in colour (ΔE) and opacity (ΔO) were obtained using the CIE L*a*b* system. The results were submitted to one-way ANOVA, Tukey HSD test and Student's t test (α=5%).All the materials showed significant changes in colour and opacity. The ΔE of the materials ranged from 0.41 to 2.40. The highest colour changes were attributed to RelyX ARC and AllCem, whilst lower changes were found in Variolink Veneer, Tetric Flow and Filtek Z350 Flow. The opacity of the materials ranged from -0.01 to 1.16 and its variation was not significant only for Opallis Flow and RelyX ARC.The accelerated ageing led to colour changes in all the evaluated materials, although they were considered clinically acceptable (ΔE3). Amongst the dual-cured resin cements, Variolink II demonstrated the highest colour stability. All the flowable composites showed proper colour stability for the luting of ceramic veneers. After ageing, an increase in opacity was observed for most of the materials. |
| Databáze: | OpenAIRE |
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