Comparison of Composite Resin (Duo-Shade) Shade Guide with Vita Ceramic Shades Before and After Chemical and Autoclave Sterilization

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Abstract

Background

This study aimed to compare a composite resin (Duo-Shade) shade guide with Vita ceramic shades before/after chemical and autoclave sterilization.

Material/Methods

Color values (L*a*b*) were recorded directly from shade tabs of prefabricated composite resin (Brilliant NG Universal Duo-Shade) and ceramic (Vita classic) shade guide with a calibrated spectrophotometer (Vita Easy Shade Advance 4.0). Seventy-two composite resin disk samples with 6 different shades (A1/B1, A2/B2, A3/D3, A3.5/B3, A4/C4, and C2/C3) (n=12 each) were divided into 2 groups (Gp) – Gp A (Autoclave) and Gp C (Chemical) (15 cycles) – to assess their influence on respective shades. Mean values calculated the color differences (ΔE) while differences in color values (L*a*b*) were graded on the National Bureau of Standards (NBS) 6-grade scale and assessed for Clinical Acceptance/Perceptible Threshold (CAT), (CPT). All differences were considered significant if the color difference ΔE was ≥3.3.

Results

Only 2 out of 12 Shade tabs (C2C3, A4C4) of composite resin matched to Vita shade tab C2 and C4 (ΔE ≤3.3). Both groups showed notable color differences after respective sterilization protocols, with color differences in Gp A significantly higher than Gp C (ΔE ≥3.3). Within groups, all shades in Gp A showed remarkably different color changes, with shade C2C3 and A1B1 being denoted as clinically unacceptable.

Conclusions

Manufacturer-provided shade guides do not match ceramic shades as claimed and chemical sterilization using 10% Deconex was associated with less color changes than with autoclave sterilization.

Related collections

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J. Chu, Rade D Paravina, Richard D Trushkowsky (2009)

To review current status of hand held systems for tooth color matching in vivo and corresponding research. "Medline" database from 1981 to 2010 were searched electronically with key words tooth, teeth, color and dentistry. Spectrophotometers, colorimeters and imaging systems are useful and relevant tools for tooth color measurement and analysis, and for quality control of color reproduction. Different measurement devices either measure the complete tooth surface providing a "color map" or an "average" color of the limited area [3-5mm] on the tooth surface. These instruments are useful tools in color analysis for direct or indirect restorations, communication for indirect restorations, reproduction and verification of shade. Whenever possible, both instrumental and visual color matching method should be used, as they complement each other and can lead towards predictable esthetic outcome. Copyright © 2010 Elsevier Ltd. All rights reserved.

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R Weber, William Rutala (2004)

All invasive procedures involve contact between a medical device or surgical instrument and a patient's sterile tissue or mucous membranes. A major risk of all such procedures is the introduction of pathogenic microbes that could lead to infection. Failure to properly disinfect or sterilize reusable medical equipment carries a risk associated with breach of the host barriers. The level of disinfection or sterilization is dependent on the intended use of the object: critical items (such as surgical instruments, which contact sterile tissue), semicritical items (such as endoscopes, which contact mucous membranes), and noncritical items (such as stethoscopes, which contact only intact skin) require sterilization, high-level disinfection, and low-level disinfection, respectively. Cleaning must always precede high-level disinfection and sterilization. Users must consider the advantages and disadvantages of specific methods when choosing a disinfection or sterilization process. Adherence to these recommendations should improve disinfection and sterilization practices in health care facilities, thereby reducing infections associated with contaminated patient-care items.

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Color difference thresholds in dental ceramics.

Razvan Ghinea, Roberto Perez, Ana Yebra … (2010)

The objective of the study was to determine the perceptibility and acceptability thresholds for dental ceramics using CIEDE2000 (ΔE(00)) and CIELAB (ΔE(ab)(*)) color difference formulas and a novel TSK Fuzzy Approximation. A 13-observer panel performed independent observations of perceptibility and acceptability judgments on 105 pairs of ceramic discs (14mm in diameter and 3mm thick). Color differences of the disc pairs were calculated using both color difference formulas (ΔE(00) ranged from 0.10 to 9.91). Two fitting procedures were used: S-shaped curve and TSK Fuzzy Approximation. For both procedures, from the resultant fitting curves, the 95% confidence intervals were estimated and the 50:50% thresholds were calculated (50% positive and 50% negative answers). With the S-shaped fitting procedure, a 50:50% acceptability threshold was found to be ΔE(00)=2.25 (r(2)=0.88) and ΔE(ab)(*)=3.46 (r(2)=0.85). Corresponding values with a TSK Fuzzy Approximation were ΔE(00)=2.23 (r(2)=0.89) and ΔE(ab)(*)=3.48 (r(2)=0.86). The perceptibility thresholds for fitted S-shape curves were ΔE(00)=1.30 (r(2)=0.74) and ΔE(ab)(*)=1.80 (r(2)=0.70) and ΔE(00)=1.25 (r(2)=0.75), and ΔE(ab)(*)=1.74 (r(2)=0.71) for the TSK Fuzzy Approximation. The ΔL', ΔC', ΔH' values corresponding to a 50% acceptability threshold were ΔL'=2.44, ΔC'=3.15 and ΔH'=3.24 respectively. The CIEDE2000 color difference formula provided a better fit than CIELAB formula in the evaluation of color difference thresholds of dental ceramics. There was a statistically significant difference between perceptibility and acceptability thresholds for dental ceramics. The TSK Fuzzy Approximation has been proved to be a reliable alternative approach for the color threshold calculation procedure. Copyright © 2010 Elsevier Ltd. All rights reserved.