Monday, November 28, 2011

Assessment of a prototype computer colour matching system to reproduce natural tooth colour on ceramic restorations

Journal of Dentistry

Abstract

Objectives

The aim of this study was to assess the accuracy of a prototype computer colour matching (CCM) system for dental ceramics targeting the colour of natural maxillary central incisors employing a dental spectrophotometer and the Kubelka–Munk theory.

Methods

Seventeen human volunteers with natural intact maxillary central incisors were selected to participate in this study. One central incisor from each subject was measured in the body region by a spectrophotometer and the reflectance values were used by the CCM system in order to generate a prescription for a ceramic mixture to reproduce the target tooth's colour. Ceramic discs were fabricated based on these prescriptions and layered on a zirconia ceramic core material of a specified colour. The colour match of each two-layered specimen to the target natural tooth was assessed by CIELAB colour coordinates (ΔE*, ΔL*, Δa* and Δb*).

Results

The average colour difference ΔE* value was 2.58 ± 84 for the ceramic specimen–natural tooth (CS–NT) pairs. ΔL* values ranged from 0.17 to 2.71, Δa* values ranged from −1.70 to 0.61, and Δb* values ranged from −1.48 to 3.81. There was a moderate inverse correlation (R = −0.44, p-value = 0.0721) between L* values for natural target teeth and ΔE* values; no such correlation was found for a* and b* values.

Conclusion

The newly developed prototype CCM system has the potential to be used as an efficient tool in the reproduction of natural tooth colour.

1 comment:

Nordstrom Dental said...

A fascinating abstract! Interesting how Technology helps improve the Dental field.