Abstract:

BACKGROUND: Studies have proved that opalescent porcelain enamel powder has some effect on aesthetic effect of alumina all-ceramic crowns.
OBJECTIVE: To observe the effect of opalescent porcelain enamel powder on the chrominance of alumina all-ceramic crowns.
METHODS: Ten samples of alumina ceramic crowns with opalescent porcelain enamel powder, and 10 samples with ordinary porcelain enamel were prepared. The ceramic layer thickness of all samples was 2.0 mm. Then PR650 spectrophotometer color measurement instrument was used to measure chrominance of these samples with shade tabs color A2 regarded as the control color, including transmissivity, luminosity, hue of color, chroma. The chromatic aberration was calculated and their color changes were analyzed.
RESULTS AND CONCLUSION: The satisfaction degree was 80% for the opalescent porcelain enamel powder, and 50% for the ordinary porcelain enamel. There were significantly differences in the chromatic aberration between the all-ceramic crowns of opalescent porcelain enamel powder and the shade tabs (P < 0.05). No significant difference was found in transmissivity T (P > 0.05). The luminosity showed significant differences among the three groups, which was highest in the opalescent porcelain enamel powder group (P < 0.05). The hue of color was arranged as follows: the ordinary porcelain enamel group > the shade tabs > the opalescent porcelain enamel powder group, and there was no significant difference (P > 0.05). The chroma values were ranked as follows: the opalescent porcelain enamel powder group > the ordinary porcelain enamel group > the shade tabs, and there was no significant difference (P > 0.05). The opalescent enamel porcelain powder can decrease chromatic aberration between alumina all-ceramic crowns and shade tabs, but cannot improve their semipermeability significantly.