Spectrophotometric Characterization of Light-induced Changes in the Autopolymerizing Resins.The Effect of Ultra Violet Light upon Various Powders in Solution

摘要

1.Pronounced, dissimilar, bleaching effects were produced in Kadon and Fastcrown powders in ethylene dichloride solutions following their exposure to long-wave ultraviolet radiation.n2. None of the powders in solution showed any significant color-absorbing substances or near ultraviolet absorbing substance pro-duction following their exposure to long-wave ultraviolet radiation.n3. Exposure of Kadon and Fastcrown powders in solution to short-wave ultraviolet produced definite bleaching effects in the visible light absorbing range from 700 to 425 m/i. Again, no bleaching effect was evident in the Replica or control powders in solution following their exposure to short-wave ultraviolet radiation.n4. Kadon yielded very slight color absorption following short-wave ultraviolet exposure, Fast¬crown powder somewhat more, and Replica and the control polymethylmethacrylate powders considerably more.n5. Each of the powders in solution showed marked near ultraviolet absorption following their radiation by short-wave ultraviolet radiation.n6. The manner in which these spectral changes may contribute to those changes previously described in the polymerized plastic specimens have been discussed.