EFFECT OF AUTO GLAZING, REGLAZING AND CHAIR-SIDE POLISHING ON COLOUR STABILITY OF FELDSPATHIC PORCELAIN MATERIALS: AN IN VITRO STUDY

Abstract

This study aimed to assess the impact ofauto-glazing, reglazing and chair-side polishing on the colour stability of four different variants of feldspathic porcelain materials. A total of 120 metal plates were fabricated using inlay wax patterns of 0.5 mm thickness by lost-wax technique. One hundred and twenty ceramic samples were made over metal plates from four different commercially available feldspathic porcelain materials, with 30 (n=30) in each group based on the parameters. Each sample was subjected to firing under a porcelain furnace, followed by auto glazing (920℃,) reglazing (900℃) and chair-side polishing. Then, the samples were subjected to analyze the colour stability using spectrophotometry (CIELAB). The feldspathic ceramic samples showed better colour stability in group II and group IV after reglazing and chair-side polishing, respectively. The chair-side polished surfaces of Group-IV samples demonstrated improvised colour stability compared to the other three variants of porcelain.