Color Reproducibility of Visible Light-cured Hard Resins with Multi-layerd Technique.

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  • Hamamatsu Takamasa
    Department of Crown and Bridge, The Nippon Dental University, School of Dentistry at Tokyo
  • Shinya Akiyoshi
    Department of Crown and Bridge, The Nippon Dental University, School of Dentistry at Tokyo
  • Yokozuka Shigeo
    Department of Crown and Bridge, The Nippon Dental University, School of Dentistry at Tokyo

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  • 多層築盛による市販光重合型硬質レジンの色調再現性に関する研究

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Abstract

The purpose of this study was to examine the role of protein of human submandibular-sublingual saliva in the retention and stability of dentures. This study was performed by analyzing how changes in protein affect viscosity.<BR>Submandibular-sublingual saliva samples obtained from 15 subjects, each with a healthy oral cavity and good general condition, were studied. A Kuette type rotary viscometer Low-Shear 30 (Contraves) was used to determine viscosity. The analysis of salivary proteins was achieved by combining microscale twodimensional SDS-PAGE with silver staining.<BR>In high viscosity saliva, 44 protein spots were detected. These spots appeared in the range of pI 3.8-10.0 and estimated molecular weight of 15, 000-1, 000, 000. In low viscosity saliva, approximately 30 protein spots were detected. These spots appeared in the range of pI 3.8-10.0 and estimated molecular weight of 15, 000-1, 000, 000.<BR>There was a significant correlation between the concentration of high molecular weight proteins with an estimated weight of more than 700, 000 and viscosity (r=071, p<0.01). High molecular weight proteins (with an estimated weight of more than 700, 000) were characterized into five groups to the isoelectric point. The two groups (more than pI 7.0 and pI 4.1-5.1) showed significant correlations with high viscosity of human submandibular-sublingual saliva (r=0.73 and p<001 for both groups).To standardize the reproducibility of the color of composite resin, the color range and tendency of photopolymerized composite resin were investigated. The color of single and multiple layer A 1 and A 3.5 were compared and analyzed using the L*a*b* color system. The results were as follows:<BR>1. The color range of the single layer photopolymerized composite resin was Opaque: L*=73.78 to 84.50, a*=0.47 to 4.01, and b*=11.96 to 19.59; Dentine: L*=50.47 to 63.95, a*=-3.75 to -1.68, and b*=-2.65 to 6.92; and Enamel: L*=38.02 to 42.33, a*=-1.67 to -0.51, and b*=-14.56 to -12.49.<BR>2. The color of triple-layer resin measured by L* and a* decreased when the thickness of dentine was increased from 0.4 mm to 1.0 mm and that of enamel was increased from 0.1 mm to 0.3 mm. However, the color of A 3.5 measured by a* was high when the thickness of enamel was between 0.1 and 0.2 mm. Hab° fluctuated within the YR and Y range in A 1 and within the YR range in A 3.5.<BR>3. The thickness of resin that is required for color expression in triple-layer photopolymerized composite resin was more than 0.6 mm of dentine and more than 0.2 mm enamel in A 1, and more than 0.6 mm of dentine and more than 0.1 mm of enamel in A 3.5.

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