Influence of laser enamel and dentine etching on marginal integrity of porcelain laminate veneers

This investigation evaluated the effect of laser etching and acid etching techniques on the marginal leakage beneath Vitadur N porcelain laminate veneers bonded either entirely on enamel, or with cervical margin located on root dentine of prepared extracted maxillary central incisors. Two different composite resin luting systems [light cured, or light and chemical cured] were used and compared. The bonded specimens were thermocycled and by employing the Standard dye penetration technique the leakage was scored from cervical and incisal margins. The least marginal leakage was observed beneath laminate veneers bonded entirely on enamel. Laser etching improved the scaling qualities of veneers with cervical margins on root dentine below the CEJ. Statistically insignificant differences were observed with the use of the two different composite resin luting systems

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. Another advantage of porcelain restorations is their tissue biocompatibility of all the available restorative materials, the gingiva responds best to restorations made of porcelain. This is explained by the ability of porcelain to attain a smooth polished surface. Restorations with a smooth surface greatly impede the accumulation of plaque and thus reduce the incidence of gingival inflammation