Clinical Application of the Computer Color Matching(CCM) System on Metal Ceramic Restorations. Part. 2 Color Reproducibility of Metal Ceramic Restorations by CCM to the Conventional Shade Guides.

DOI Web Site 3 Citations
  • Ishikawa-Nagai Shigemi
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Sawafuji Futoshi
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Shiraishi Akira
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Sato Riichiro
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Tsuchitoi Hiroshi
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Takebe Jun
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Tachibana Naofumi
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Satodate Tamaki
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Ishibashi Kanji
    Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
  • Ikeno Hirokazu
    Iwate School of Dental Technology
  • Miyoshi Takumi
    Iwate School of Dental Technology
  • Murata Yukio
    Murata Color Engineering

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Other Title
  • 陶材焼付鋳造冠のＣＣＭシステムに関する臨床的検討　第２報　シェイドガイドを目標色とした陶材焼付鋳造冠における色調構築
  • Part. 2 Color Reproducibility of Metal Ceramic Restorations by CCM to the Conventional Shade Guides
  • 第2報シェイドガイドを目標色とした陶材焼付鋳造冠における色調構築

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Abstract

The purpose of this report was to reproduce accurate colors in metal ceramic restorations by using the Computer Color Matching (CCM) system. The conventional shade guide was used as the objective “target” colors, and a newly modified spectrophotometer was developed by our department that allowed non-contact measurements of small areas. Normal-shaped tooth preparations of the central incisors having labial reductions of 0.8-1.5 mm were done, and color shade guides were used to produce the objective metal ceramic crowns. The CCM program made it possible to calculate the amount and color of each porcelain layer within a specified thickness, and the metal ceramic crown was made based on these findings by using Shofu metal Aurora and Vintage porcelain. Opaque porcelain was baked at an even thickness of 0.3 mm based upon the CCM formulations, and the calibrated dentin and enamel was added later at their specified thicknesses.<BR>Results of the CCM made metal ceramic crown showed the color to be indistinguishable from that of the original shade guide color with the unaided-eye. Furthermore, analyses showed the color difference dE (CMC) to be under 3.0, indicating a high accuracy level in terms of color reproducibility, and its possible use in clinical practice.

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