Record number :
2129566
Title of article :
Colour stability and opacity of resin cements and flowable composites for ceramic veneer luting after accelerated ageing
Author/Authors :
Archegas، نويسنده , , Lucي Regina Panka and Freire، نويسنده , , Andrea and Vieira، نويسنده , , Sérgio and Caldas، نويسنده , , Danilo Biazzetto de Menezes and Souza، نويسنده , , Evelise Machado، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
7
From page :
804
To page :
810
Abstract :
Objectives 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. s ting 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 Studentʹs t test (α = 5%). s e 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. sions celerated ageing led to colour changes in all the evaluated materials, although they were considered clinically acceptable (ΔE < 3). 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.
Keywords :
Resin cements , Flowable composites , accelerated ageing , Colour stability , opacity , Ceramic veneer
Journal title :
Journal of Dentistry
Serial Year :
2011
Link To Document :
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