International Journal of Prosthodontics and Restorative Dentistry

Register      Login

VOLUME 5 , ISSUE 2 ( April-June, 2015 ) > List of Articles

RESEARCH ARTICLE

A Spectrophotometric Analysis of Color Changes in Metal Ceramic Restorations by Varying Porcelain Thickness and Repeated Firings: An in vitro Study

Sunantha Selvaraj, Ramesh Raju, Vidhya Zankari, Manonmani Vijayakumar

Citation Information : Selvaraj S, Raju R, Zankari V, Vijayakumar M. A Spectrophotometric Analysis of Color Changes in Metal Ceramic Restorations by Varying Porcelain Thickness and Repeated Firings: An in vitro Study. Int J Prosthodont Restor Dent 2015; 5 (2):38-43.

DOI: 10.5005/jp-journals-10019-1127

Published Online: 01-06-2015

Copyright Statement:  Copyright © 2015; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Purpose

The objective of this study is to find out the adequate porcelain thickness required for metal ceramic restorations to match the color of the shade guide and effect of repeated firing on quality and physical characteristics of dental ceramics.

Methods

Preparation of samples done first by preparing alloy substructure. A total of 15 samples of uniform thickness 0.5 mm was prepared using Ni-Cr alloy. Fusion of porcelain to alloy substructure done. Fifteen samples, five 0.5 mm thickness samples, five 1 mm samples and five 1.5 mm porcelain thickness samples were prepared. Color evaluation done by spectrophotometer.

Statistic analysis

Statistic analysis methods employed in the present study were ANOVA-one way, Scheffe's post hoc test and paired samples ‘t’ test.

Conclusion

The thickness of porcelain significantly affects the color of a given porcelain sample. Increasing the thickness gives better results. On repeated firings two and 10 firing did not affect the color stability.

How to cite this article

Raju R, Selvaraj S, Zankari V, Vijayakumar M. A Spectrophotometric Analysis of Color Changes in Metal Ceramic Restorations by Varying Porcelain Thickness and Repeated Firings: An in vitro Study. Int J Prosthodont Restor Dent 2015;5(2):38-43


PDF Share
  1. Anusavice. ‘Phillips’ Science of Dental Materials”. 11th edition. Elsevier Health Sciences Publications.
  2. Esthetics of anterior fixed prosthodontics. Chicago: Quintessence, 1994. p. 97-113.
  3. The effect of manipulative variables on the color of ceramic metal restorations. J Prosthet Dent 1988;60(3):297-303.
  4. Spectrometric analysis of the influence of metal substrates on the color of metal-ceramic restorations. J Prosthet Dent 1985;64(1):74-77.
  5. Spectrophotometric analysis of a non greening, metal fusing porcelain. J Prosthet Dent 1991;65(5):634-641.
  6. Double-layer color effects in porcelain systems. J Dent Res 1985;64(7):940-943.
  7. Spectrophotometric study of five porcelain shades relative to the dimensions of color, porcelain thickness, and repeated firings. J Prosthet Dent 1979;42(1):96-105.
  8. Evaluation of the color and appearance of surface texture of opaque porcelain. Int J Prosthodont 1991;4(6):548-554.
  9. Relative color stability of ceramic stains subjected to glazing temperatures. J Prosthet Dent 1991;66(1):20-23.
  10. A comparative study of shade-matching procedures. J Prosthet Dent 1970;24(2):166-173.
  11. The size of acceptable color differences. J Opt Soc Am 1953;43(4):581-589.
  12. International commission on illumination. Colorimetry: official recommendations of the international commission on illumination, publication Cielab No. 15 (E-1.3.1), Bureau Central de La CIELAB Paris.
  13. Color and glaze-effects of repeated firings. J Pros thet Dent 1982 April.
  14. Effect of porcelain thickness and type of metal ceramic alloy on color. J Prosthet Dent 1987;57(2):138-142.
  15. Using a computer color matching system in color reproduction of porcelain restoration part II: color reproduction of stratiform layered porcelain samples. Int J Prosthodont 1993;6(6):522-527.
  16. Spectrophotometric study of the relationship between body porcelain color and applied metallic oxide pigments. J Prosthet Dent 1985;53(6):790-796.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.