The Journal of Contemporary Dental Practice

Register      Login

SEARCH WITHIN CONTENT

FIND ARTICLE

Volume / Issue

Online First

Archive
Related articles

VOLUME 13 , ISSUE 4 ( July-August, 2012 ) > List of Articles

RESEARCH ARTICLE

The Effect of Different Curing Time Regimens on Immediate Postpolymerization Color Changes of Resin Composites

Arash Poorsattar Bejeh Mir, Morvarid Poorsattar Bejeh Mir

Citation Information : Mir AP, Mir MP. The Effect of Different Curing Time Regimens on Immediate Postpolymerization Color Changes of Resin Composites. J Contemp Dent Pract 2012; 13 (4):472-475.

DOI: 10.5005/jp-journals-10024-1171

Published Online: 01-08-2012

Copyright Statement:  Copyright © 2012; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim

Light curing of resin composites may considerably change the color of resin composites. The aim of this study was to evaluate the changing pattern of resin composite's color by different curing times.

Materials and methods

Fifteen, 1 mm-thick, samples of each A2 shade Clearfill and Filtek P60 composites were prepared. First five samples were cured for 10s (400 mW/cm2) in each pole of the rectangular samples (right upper, right lower, left lower, left upper plus central zone). Consecutive sets of samples, each consists of five, were irradiated by doubling and tripling the curing time to 20 and 30s. Color change were measured by means of CIE 1976 L*a*b system equation (ΔE) for each digitalized picture of the corresponding sample.

Results

Color of samples was clinically significant changed by increasing the curing time from 10 to 20s and from 20 to 30s for Clearfil (ΔE = 13.86 and 14.11 respectively,) and Filtek P60 (ΔE = 7.68 and 11.66 respectively). The ‘b’ component change was responsible for the most color alteration confirmed by the linear regression model (p < 0.001).

Conclusion

This study revealed the contrasting pattern of resin composite's color change with the different curing times. Our findings support that light curing is accompanied by a higher attained blue chroma and diminished yellowness of resin composites.

Clinical significance

A complete and proper curing of sample resin composites on buccal surface of particular tooth, as a common practice to ensure the maximize concordance composite and tooth color, is reassured according to the considerable differences of undercured and overcured in comparison to normocured composite.

How to cite this article

Poorsattar Bejeh Mir A, Poorsattar Bejeh Mir M. The Effect of Different Curing Time Regimens on Immediate Postpolymerization Color Changes of Resin Composites. J Contemp Dent Pract 2012;13(4):472-475.


PDF Share
  1. The effect of resin shades on microhardness, polymerization shrinkage and color changes of dental composite resins. Dent Mater J 2009;28:438-45.
  2. Colorimetric changes in composites resulting from visible-light-initiated polymerization. Dent Mater 1990;6:133-37.
  3. Analysis of photoinitiators in visible-light cured dental composite resins. J Dent Res 1988;67:24-28.
  4. Staining of resin-based veneering materials with coffee and tea. Quintessence Int 1991;22:377-86.
  5. Dental discoloration: an overview. J Esthet Dent 1999;11:291-300.
  6. Tooth colour: A review of the literature. J Dent 2004, 32:3-12.
  7. Dental materials and their selection. Chicago: Quintessence 1997:passim.
  8. Composite resin color stability: Influence of light sources and immersion media. J Appl Oral Sci 2011;19:204-11.
  9. Effect of exposure time on the color stability of resin-based restorative materials when polymerized with quartz-tungsten halogen and LED light. Clin Oral Investig 2010;14:599-605.
  10. Color stability of indirect composite materials polymerized with different polymerization systems. J Oral Sci 2009;51:267-73.
  11. Comparison of tooth crown discoloration with Epiphany and AH26 sealer in terms of chroma and value: An in vitro study. Braz Oral Sci 2011;10:171-74.
  12. Color changes of dental resin composites before and after polymerization and storage in water. J Esthet Restor Dent 2011;23:179-88.
  13. Evaluation of dielectric curing monitoring investigating lightcuring dental filling composites. Materials Engineering 2011;18:30-35.
  14. Application of a digital technique in evaluation of the reliability of the shade guide. J Oral rehab 2004;31:483-91.
  15. Postirradiation polymerization of visible light-activated composite resins. J Dent Res 1983;62:363-65.
  16. Degree of conversion and color stability of the light curing resin with new photoinitiator systems. Dent Mater 2009;25:1030-38.
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.