Investigation of the effect of thickness of multilayer glass ceramics on color transition and translucency.
Project no. 22249 · Status: Kapanmış (Yayın bekleniyor) · 2020
Summary
<p>In this study, color transitions and translucency differences in multi-layer, lithium disilicate-based lamina restorations, which are used more in the anterior region, were investigated in vitro with the help of spectrophotometer. Prisms in the form of rectangular prisms with dimensions of 0.6 mm x 6 mm x 10 mm, 0.8 mm x 6 mm x 10 mm and 1 mm x 6 mm x 10 mm, homogeneous in thickness and width at every point, were designed with AutoCAD program. The designs created with AutoCAD were transferred to the 3D-Printer device. 12 prisms of 0.6 mm x 6 mm x 10 mm dimensions, 12 prisms of 0.8 mm x 6 mm x 10 mm dimensions and 12 prisms of 1 mm x 6 mm x 10 mm dimensions, castable wax resin models were created. A total of 36 wax models prepared with 3 different groups were attached to 3 cuffs. The inside of the cuff is filled with phosphate-bonded investment. Then, the pre-heating phase, in which wax blowing will be achieved, was started. The cuff filled with the investment was taken to the cuff furnace, allowing the wax modeling to move away from the investment. The cuff prepared for casting is placed inside the porcelain furnace. Multi-layered lithium disilicate-based porcelain was cast into the prepared investment under high temperature and pressure. The samples prepared after firing were left to cool at room temperature. The restoration created with the rupture of the investment was exposed and examined, paying attention to the absence of air bubbles or wax residue. Lithium disilicate samples were glazed and made ready for color measurement by spectrophotometer. v The prepared samples were examined in the CIE L*a*b* color system with the help of spectrophotometer from the light color part called 'incisal' and the dark color part called 'chole'. According to the results, the use of multi-layered lithium disilicate blocks in cases where the restoration thickness varies between 0.6-1 mm provides visible color harmony. However, in cases where the restoration thickness varies more than 0.6-1 mm, the use of multi-layered lithium disilicate blocks may cause visible color mismatch. Keywords: Lithium Disilicate; Multilayer; Aesthetic; Colour; Transition; Laminate; Restoration</p>