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Evaluating the Effects of Different Polishing Methods on Color Stability of Dental Restorations in Pediatric Dentistry

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Determining color difference thresholds in denture base acrylic resin.

Jiabao Ren¹, Hong Lin², Qingmei Huang³

¹Postgraduate student, Department of Dental Materials, School and Hospital of Stomatology, Peking University, Beijing, China.

The Journal of Prosthetic Dentistry

|August 17, 2015

Summary

Choosing the right color difference formula is crucial for restorative prostheses. The CMC(1:1) and CIEDE2000 formulas accurately assess color stability in acrylic resins, outperforming CIELab.

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Area of Science:

Dental Materials Science
Color Science
Biomaterials Engineering

Background:

Accurate color assessment is vital for restorative prostheses.
Quantifying color change in acrylic resins requires appropriate color difference formulas.
The selection of a suitable formula for color stability assessment is not straightforward.

Purpose of the Study:

To identify the optimal color difference formula for evaluating color changes in acrylic resins.
To establish perceptibility and acceptability thresholds for color stability in denture base acrylic resins.
To compare the performance of different International Commission on Illumination (CIE) color difference formulas.

Main Methods:

Fabrication of 291 acrylic resin denture base plates and radiation testing (ISO 7491:2000).
Color measurement using a portable spectrophotometer.
Calculation of color differences using CIELab, CMC(1:1), and CIEDE2000 formulas.
Psychophysical perceptibility and acceptability assessments by 34 observers.
Analysis of receiver operator characteristic (ROC) curves and area under the curve (AUC) values.

Main Results:

CMC(1:1) and CIEDE2000 formulas demonstrated superior performance in quantifying imperceptible to unacceptable color differences.
Perceptibility thresholds were 2.52 for CMC(1:1) and 1.72 for CIEDE2000.
Acceptability thresholds were 6.21 for CMC(1:1) and 4.08 for CIEDE2000.

Conclusions:

CMC(1:1) and CIEDE2000 formulas offer higher discriminability for assessing perceptible color differences in denture base acrylic resin compared to CIELab.
A significant statistical difference was observed between perceptibility and acceptability thresholds for color stability in denture base acrylic resin.