Optical Properties Of Dental Ceramics

A systematic review presented at the 17th international conference on biomechanics and biomedical engineering dubai united arab emirates december 2015.

Optical properties of dental ceramics.

Optical properties of the glass ceramics such as translucency and opalescence are critical factors for aesthetics and the natural appearance of the ceramic restorations. Yttria stabilized tetragonal zirconia polycrystal has been used as a dental biomaterial for several decades because the fracture toughness and bend strength are increased by a stress induced transformation toughening mechanism. The long term success of a dental restoration treatment is defined by its durability which is directly influenced by the oral environment. The term dental ceramics comprises a wide variety of materials that reaches from filled glasses to nearly dense sintered ceramics from products that are shaped from powders and melts to components milled from blanks before or after sintering.

It is better to build restorations with porcelain with the same opalescent characteristics as enamel rather than to create an artificial incisal halo for example with opaque yellow stains. In dental ceramics the appearance of the tooth is successfully imitated as a sum of all its visual dimensions. Their properties vary over a wide range. However it weakens the structure by decreasing the resistance to crack propagation.

The mechanical and optical properties of dental ceramics mainly depend on the nature and the amount of crystalline phase present. Optical properties fine ceramics are sintered materials consisting of microscopic crystal particles separated by boundary elements. Fine ceramics can be made translucent by minimizing pores and boundary elements after sintering and by increasing crystal size in order to reduce boundary interfaces. Two physical properties in particular are used to assess the clinical performance of today s dental ceramics.

Several factors such as the ceramic thickness processing technique composition inner structure crystalline content grain size pores additives and surface roughness. This study s purpose was to evaluate the artificial aging behavior of nanostructured respective microstructured ceramics related to surface topography roughness and optical properties. Optical density and fiber optic properties. Optical properties of zirconia ceramics for esthetic dental restorations.

More the glassy phase more the translucency of ceramics. Optical properties of zirconia ceramics for esthetic dental restorations. The concern that a ceramic will fracture in service remains a problem for ceramic alloy and all ceramic restorations alike although the newest crystalline ceramics see figure 14 3 are beginning to challenge this notion.