光敏复合树脂固化前后的颜色变化

THE COLOR CHANGES OF LIGHI-CURING COMPOSITE RESINS BEFORE AND AFTER POLYMERIZATION

目的 :本实验测试了 4种光固化复合树脂固化前和固化后的色度值变化。方法 :将树脂制成直径 1 0mm ,高 1 0mm的园柱型试件 ,应用美能达CS - 32 1便携式色差仪测试TPH ,SculptIt,Durafil,Charisma四种光固化复合树脂固化前后的色度值L 、a 、b 值 ,根据色差公式△E =〔(△L ) 2 +(△a ) 2 +(△b ) 2 〕1 / 2 ,计算树脂固化前后的颜色变化值△E。结果 :4种光固化复合树脂的 2 7种色调树脂在固化后都发生了较显著的颜色变化 ,色差值△E在 4 6 6至 1 5 1 1个色度单位之间。TPH、SculptIT、Charisma树脂色度值L 、b 值降低 ,a 值变化不大 ;Durafil树脂色度值L 、b 值升高。结论

Objective:This study measured the color changes of four kinds of light curing composite resins before and after polymerization by using digital colorimetry.Methods:Three disks(10 mm in diameter,10 mm thick) of each material were prepared in a mold.L ,a ,b  color parameters of 27 different shades of TPH,Sculpt It,Durafil,Charisma (light curing composite resins)were taken precure and postcure.Color difference between precure and postcure(△E)was calculated as △E=〔(△L ) 2+(△a ) 2+(△b ) 2〕 1/2 .Results:The results showed that all restoratives tested underwent color changes during polymerization.Changes in L  and b  parameters during polymerization were significant for all materials.L  and b  parameters decreased for TPH,Sculpt It and Charisma,but increased for Durafil.The color difference(△E)was from 4 66 to 15 11.Conclusion:The color change of the four composite resins examined is noted before and after polymerization.