The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

COMPARISON OF SHADE CHANGES ACCORDING TO DRY/WET CONDITION OF TEETH USING INTRA-ORAL COLORIMETER

  • Lee, Dong-Hwan (Department of Prosthodontics, Graduate School, Seoul National University) ;
  • Han, Jung-Suk (Department of Prosthodontics, Graduate School, Seoul National University) ;
  • Yang, Jae-Ho (Department of Prosthodontics, Graduate School, Seoul National University) ;
  • Lee, Jai-Bong (Department of Prosthodontics, Graduate School, Seoul National University)
  • Published : 2005.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

Objectives. The purpose of this study was to compare the shade changes in wet and dry conditions of natural teeth using two different intra-oral colorimeters. Materials and methods. Twenty volunteer subjects have no restorations and fillings in the maxillary central incisors were involved in this clinical study. The color of tooth was measured by two different instruments that were a Shade $Scan^{TM}$ System and a VITA $Easyshade^{(R)}$, Five times consecutive measurements were done for each subject with both instruments. Groups of measurement are an initial wet condition as control, dry in 5 minutes, 15 seconds after re-wetting with saliva, re-wetting after 5minutes and re-wetting after 30 minutes. Using ShadeScan $System^{TM}$, tooth image was captured and converted to the mapping image of Vitapan 3D master. Three main shades were chosen from each subject and calculated the area in Global Lab Image software. Data were analyzed using paired T-Test and Wilcoxon Signed Ranked Test. Using VITA $Easyshade^{(R)}$, color differences($\Delta$E) between measurements were analyzed with one sample T-test. Results. Using ShadeScan $System^{TM}$, there were significant differences between control group and dry(P=.023), dry and re-wetting 15 seconds, 5 minutes, 30 minutes as well(P=.021, P=.017, P=.030) in comparison of primary shade. However, comparing three main shades, there was no significant difference between control and dry(P=.105). Using VITA $Easyshade^{(R)}$, color differences($\Delta$E) between control and dry, dry and re-wetting 30 minutes were statistically different(P=.002, P=.022). Conclusion. Primary shade could be changed in dry and wetting procedure in time, however there was no significant shade changes in overall.

Keywords

References

  1. Seghi RR, Johnston WM, O' Brien WJ. Spectrophotometric analysis of color differences between porcelain system. J Prosthet Dent 1986;56:3540
  2. Davision SP, Myslinski NR. Shade selection by color vision-detective dental personnel. J Prosthet Dent 1990;63:97-101 https://doi.org/10.1016/0022-3913(90)90276-I
  3. Paravian RD. Evaluation of a newly developed visual shade matching apparatus. Int J Prosthodont 2002;15:528-34
  4. McPhee ER. Light and color in dentistry. Part I nature and perception. J Mish Dental Assoc 1978;60:565-72
  5. Preston JD. Perspectives in dental ceramics Proceedings of the fourth international symposium on ceramics. Quintessence, 1988;279-84
  6. Winter R. Visualizing the natural dentition. J Esthet Dent 1993;5:102-17
  7. Shillingburg HT. Fundamentals of Fixed Prosthodontics. 3rd ed. Quintessence. 1997
  8. O' Brien WJ, Groh CL, Boenke KM. A new smallcolor-difference equation for dental shades. J Dent Res 1990;69:1762-4 https://doi.org/10.1177/00220345900690111001
  9. Van der Burgt JP, ten Bosch JJ, Borsboom PC, Plasschaert AJ. A new method for matching tooth colors with color standards. J Dent Res 1985;64:837-41 https://doi.org/10.1177/00220345850640051101
  10. Shotwell JL, Johnston WM, Swarts RG. Color comparisons of denture teeth and shade guides. J Prosthet Dent 1986;56:31-4 https://doi.org/10.1016/0022-3913(86)90278-7
  11. Schwabacher WB, Goodkind RJ. Three-dimensional color coordinates of natural teeth compared with three shade guides. J Prosthet Dent 1990;64:425-31 https://doi.org/10.1016/0022-3913(90)90038-E
  12. Wozniak WT. Proposed guidelines for the acceptance program for dental shade guides. Chicago: American Dental Association, 1987:1-2
  13. Eldiwany MS, Paravina RD, and Powers JM. Performance assessment of a new intra-oral spectrophotometer. IADR, 2004
  14. Wee A, Valentine CE, and Beck FM. Reliability of the ShadeScan for three different shade guides. IADR, 2004
  15. Hunt R, Measuring Colour, Fountain Press. 1998
  16. Tung FF, Goldstein GR, Jang S, and Hittelman E. The repeatability of an intraoral dental colorimeter. J Prosthet Dent 2002