Resumo

TORNE-DURAN, Sergi; ESCUIN-HENAR, Tomás  e  MONREAL-NIETO, Julià. Cambios cromáticos en la superficie cerámicaChromatic changes on the ceramic surface. RCOE [online]. 2003, vol.8, n.5, pp.487-496. ISSN 1138-123X.

An insufficient tooth reduction for a subsequent PFM-retainer leads to the fabrication of either a restoration with an adequate morphology, but insufficient porcelain thickness or to an overcontoured restoration with an adequate porcelain thickness. In the last case, in order to achieve a proper occlusion it will be necessary to carry out an intraoral adjustment of the porcelain, producing a highly abrasive surface, which will need to be finished by mechanical polishing or final glazing. In both cases, these final adjustments and polishing steps will modify the porcelain surface and can have an impact on the final chromatic effect of the restoration. Based on this, we have designed a study to evaluate the colour changes associated to the polishing of the porcelain. It was carried out on 95 PFMsamples, combining two shades, six alloys and three ceramics. All were subjected to colorimetric analysis. The results show that there are differences in shade between the different alloys, ceramics and hues before and after the polishing of a glazed ceramic surface. The «Cosmor» -alloy shows the largest colour variation, while the «Wiron»- alloy exhibits the smallest variation. The ceramic whose shade is more influenced by the polishing is «Vita VMK».

Palavras-chave : Ceramics; Colour; Polishing; Alloy.

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