Tooth Discoloration Clinical Trial
Official title:
Patient Satisfaction and One Year Clinical Evaluation of Glazed IPS Empress CAD Versus Glazed Celtra Duo Ceramic Laminate Veneers
The most frequent reason for failure of laminate veneers made of glass ceramics (feldspathic, leucite based and lithium silicate based ceramics) was fracture of the ceramic, Therefore, ceramic materials that have higher fracture resistance, especially for patients suffering from abnormal occlusion, are needed.
IPS Empress CAD is a leucite glass-ceramic of the SiO2-Al2-O3-K2O material systems with
leucite crystal ranging from 5 to 10 µm in size. The leucite crystals increase the material
strength and interferes with crack propagation, while the fracture energy is absorbed by the
crystalline phase. The resistance and flexural strength (160 Mpa) is improved by the
difference in the coefficient of thermal expansion between the glass phase and the
crystalline phase and the cooling process following sintering phase.
CELTRA DUO: is a new generation of glass ceramic material. With the aid of a new
manufacturing process, the glass ceramic is infiltrated with 10% zirconia by weight,
producing zirconia reinforced lithium silicate ceramic (ZLS). The material is characterized
by a unique homogenous structure with fine grains that provides excellent material quality
and consistency, high strength properties and long term performance. In addition, the
material offers satisfying processing characteristics which can be milled and polished
easily. After milling the restorations are shaded correctly shaded, with no need for
crystallization step 10. The milled restorations have a flexural strength of 210 MPa. After
stain and glaze firing the restoration will exhibit a flexural strength up to 370 MPa.
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