Perceptibility and acceptability of CIELAB color differences in computer-simulated teeth

Area of Science:

• Dental Materials Science
• Color Science
• Human Perception

Background:

• Accurate tooth color matching is crucial in restorative dentistry.
• Computer-generated simulations offer a controlled environment for color perception studies.
• Signal detection theory (SDT) provides a robust framework for analyzing perceptual judgments.

Purpose of the Study:

• To evaluate the perceptibility and acceptability of tooth color differences using computer-generated simulations.
• To apply signal detection theory (SDT) methodology to quantify color difference thresholds.
• To compare color difference thresholds between dental professionals and patients.

Main Methods:

• Utilized computer-generated tooth pairs with simulated gingiva on a calibrated monitor.
• Employed signal detection theory (SDT) to measure responses to color differences (DeltaE) across L*, a*, and b* axes.
• Included controls for false alarm rates (DeltaE=0) within the experimental sessions.

Main Results:

• No significant differences in color perception thresholds were found among dentists, auxiliaries, technicians, and patients.
• Average 50% match/acceptance points were approximately 1.0 DeltaE in L* and a*, and 2.6 DeltaE in b*.
• False alarm rates for perceptibility and acceptability averaged around 27-28%, with SDT reanalysis yielding larger color difference thresholds.

Conclusions:

• Color difference thresholds for simulated teeth align with studies using real dental materials.
• No significant difference was observed between acceptability and perceptibility thresholds.
• Frequent reporting of non-existent color differences necessitates factoring false alarm rates into quality control standards for dental prostheses.