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Color differences coefficients of body-opaque double layers
W J O'Brien1, P L Fan, C L Groh
1Department of Biologic and Materials Sciences, University of Michigan, Ann Arbor.
This study aimed to measure how much the color of dental porcelain changes when a 1-mm body layer is placed over an opaque layer of the same shade and brand. The researchers tested six porcelain shades and four brands. They found that the color change, called a color difference coefficient, ranged from 6.76 to 14.32. The study showed no significant differences between shades or brands. The researchers suggest that these coefficients can help clinicians choose materials to achieve better esthetic results in dental restorations. The findings support the use of this method for practical material evaluation.
Area of Science:
- Dental materials science
- Colorimetry in dentistry
Background:
Current dental practices rely on layered porcelain for restorations. The body and opaque layers interact to produce final color. Prior research has shown that layering affects visual outcomes. However, no prior work had resolved how much a 1-mm body layer alters color when placed over an opaque layer. This gap motivated the need for a quantitative measure. The study aimed to address this uncertainty. No existing data quantified this specific interaction. The research fills a critical need in material selection for dental restorations.
Purpose Of The Study:
This study aimed to quantify the color change caused by a 1-mm body porcelain layer over an opaque layer. The goal was to define a measurable coefficient for this effect. The researchers wanted to assess if shade or brand influences the outcome. They evaluated six shades and four porcelain brands. The motivation was to improve esthetic predictability in dental restorations. The study focused on practical application in clinical settings. The research sought to provide a tool for material selection. The purpose was to guide clinicians in achieving desired color outcomes.
Main Methods:
The researchers selected six porcelain shades and four brands for evaluation. Each sample included an opaque layer and a 1-mm body porcelain layer. Color measurements were taken using a spectrophotometer. The color difference coefficient was calculated for each combination. The study compared results across all shade and brand combinations. No prior work had used this specific measurement approach. The methodology ensured consistency in sample preparation. The researchers controlled for variables like firing conditions and layering technique.
Main Results:
The color difference coefficients ranged from 6.76 to 14.32 across all samples. No significant differences were found between the six porcelain shades. Similarly, no significant differences were observed between the four brands. The highest coefficient was recorded for one specific shade-brand combination. The lowest coefficient occurred in another combination. The results suggest that shade and brand do not strongly affect the outcome. The range indicates variability in how body porcelain alters color. The findings support the use of this coefficient for material selection.
Conclusions:
The study found no significant differences between porcelain shades or brands. The color difference coefficient provides a practical evaluation method. The researchers propose that this coefficient can guide material selection. The results suggest that shade and brand may not be essential factors. The findings support the use of this coefficient in clinical practice. The study does not claim that all porcelain behaves identically. The results are limited to the evaluated samples and conditions. The authors suggest that this coefficient can improve esthetic outcomes in restorations.
Frequently Asked Questions
It is the color change caused by a 1-mm body porcelain layer over an opaque layer of the same shade and brand.
The study evaluated six porcelain shades and four porcelain brands.
The researchers selected 1 mm as a clinically relevant standard for measuring color change.
A spectrophotometer was used to measure and calculate the color difference coefficients.
The coefficients ranged from 6.76 to 14.32 across all tested combinations.
The authors propose that these coefficients can guide material selection for better esthetic outcomes.