Influence of different monomer on degree of conversion and color stability to dental resin/ceramic composite materials

Abstract:

This study was conducted to investigate the influence of different monomer on degree of conversion (DC) and color stability of dental resin/ceramic composite materials, as well as the effect of different curing methods. The degrees of conversion of monomer group were found to increase in the order of Bis-GMA, Bis-EMA, UDMA, as 51.87%, 69.29%, 79.98% respectively. And the color changes of these specimens showed the opposite trend, as 1.780, 1.244, 0.534 respectively. When cured in different curing conditions, the degrees of conversion showed a slow-growth with the increase of temperature, and light-cured specimens’ degrees of conversion on specimens’ surface was similar to that of heat-cured ones. Dual cured specimens showed higher DC than merely light-cured or heat-cured ones. Thereinto, in dual cured system of heat-light-cured, the DC reached 87.52%, much higher than merely heat-cured ones of 77.24%, which had clinical significance.

Key words:Dental resin/ceramic composite materials; degrees of conversion; color stability