Effect of reglazing and of polishing on the surface roughness of new ceramic restorations (Hi-ceram).

Dental porcelains are the materials from which the most esthetic and hygienic restorations are made. The high esthetic quality of porcelain restoration is attributed to its surface texture, which is characterized by reflection and absorption of light rays(1). Another advantage of porcelain restorations is their tissue biocompatibility of all the available restorative materials, the gingiva responds best to restorations made of porcelain(2). This is explained by the ability of porcelain to attain a smooth polished surface(3). Restorations with a smooth surface greatly impede the accumulation of plaque and thus reduce the incidence of gingival inflammation(4,5).