Aesthetic Result of Ceramic Restorations with Different Cements.

Abstract

The purpose of this study is to assess the aesthetic outcome of glass ceramic restorations of various thicknesses cemented to composite resin substrates of different shades with multiple cements.

120 samples of IPS e.max® CAD (HT) (Ivoclar Vivadent, Schaan, Liechtenstein) lithium disilicate ceramic and 120 samples of VitaBlocs® Mark II (VITA Zahnfabrik, Bad Säckingen, Germany) feldspathic ceramic in colour A1 were obtained. The samples were cut with a thickness of 0,5mm and 0,8mm. For the simulation of the substrate, 240 samples of FiltekTM Supreme XTE Universal Restorative Body (3M ESPE, Minnesota, USA) composite resin in colours A2 and A3 were produced with a thickness of 1mm. All samples were polished. After surface treatment, the ceramic samples were cemented to the composite resin samples, according to the groups formed, initially with glycerine and subsequently with RelyXTM Veneer Cement System (3M ESPE, Minnesota, USA) in the Translucent (TR) and White Opaque (WO) shades, and RelyXTM Universal Resin Cement (3M ESPE, Minnesota, USA) in the Translucent (TR) shade. The results were obtained through the EasyShade® V (VITA Zahnfabrik, Bad Säckingen, Germany) spectrophotometer. The analysis of colour difference was carried out through the calculation of ¿Eab and ¿E00 and the analysis of the L*, a* and b* coordinates, as well as their differences (¿L*, ¿a* and ¿b*) were also calculated for each pair of samples.

The highest lightness values were obtained from a 0,8mm VitaBlocs® Mark II ceramic cemented to an A2 composite resin base with Veneer WO cement (88,59 ± 1,77) and the lowest from a 0,5mm IPS e.max® ceramic cemented to an A3 composite resin base with Universal TR cement (80,91 ± 0,31). The highest ¿Eab and ¿E00 were obtained from an A3 composite resin base masked with a 0,8mm VitaBlocs® Mark II ceramic and cemented with Veneer WO (20,20 ± 0,65 and 11,16 ± 0,46, respectively). The lowest ¿Eab and ¿E00 were obtained from an A2 composite resin base masked with a 0,5mm IPS e.max® ceramic and cemented with Universal TR (7,50 ± 0,44 and 4,35 ± 0,23, respectively).

The aesthetic outcome of glass ceramic restorations can be influenced by a variety of factors, including the ceramic type and thickness, the cement colour used, and the shade of the substrate.